Browsing by Author "Prieto, J. L."
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- ItemLuminous Type II supernovae for their low expansion velocities(2020) Rodríguez, O.; Pignata, Giuliano; Anderson, J. P.; Moriya, T. J.; Clocchiatti, Alejandro; Förster, F.; Prieto, J. L.; Phillips, M. M.; Burns, C. R.; Contreras, C.; Folatelli, G.; Gutiérrez, C. P.; Hamuy, M.; Morrell, N. I.; Stritzinger, M. D.; Suntzeff, N. B.; Benetti, S.; Cappellaro, E.; Elias Rosa, N.; Pastorello, A.; Turatto, M.; Maza, J.; Antezana, R.; Cartier, R.; González, L.; Haislip, J. B.; Kouprianov, V.; López, P.; Marchi Lasch, S.; Reichart, D.
- ItemSupernova 2010gu(2010) McNaught, R. H.; Garradd, G.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.McNaught, R. H.; Garradd, G.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.McNaught, R. H.; Garradd, G.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.McNaught, R. H.; Garradd, G.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.McNaught, R. H.; Garradd, G.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.McNaught, R. H.; Garradd, G.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.McNaught, R. H.; Garradd, G.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.Further to CBET 2387, R. H. McNaught and G. Garradd, Australian National University; A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; J. L. Prieto, Carnegie Observatories; M. Catelan, Pontificia Universidad Catolica de Chile; E. C. Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; and E. Christensen, Gemini Observatory, report the CRTS discovery of an apparent supernova in unfiltered Siding Spring Survey (SSS) images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010gu Aug. 7.67 22 19 23.16 -36 58 24.5 18.0 7".0 E, 3".3 N Further SSS magnitudes for 2010gu: July 9.81, [19.5; Aug. 10.76, 17.9. The host galaxy, 2MASX J22192259-3658278, has redshift z = 0.056....
- ItemSupernova 2010iw near UGC 4570(2010) Howerton, C.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.Report the discovery by Howerton of an apparent supernova in public Catalina Sky Survey (CSS) images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010iw Oct. 14.66 8 45 15.01 +27 49 21.8 16.4 12".9 W, 3".4 S Further magnitudes for 2010iw: June 11.16 UT, [19.0 (CSS); Oct. 17.50, 16.3 (Howerton, remotely with a 0.6-m LB-1 telescope, Rodeo, NM, U.S.A.). They note that the new object lies 5".4 east and 1".1 north from a galaxy seen in Sloan Digital Sky Survey images with measured redshift z = 0.109; the current luminosity of 2010iw appears too high for it to be a regular supernova associated with this distant galaxy. The host galaxy is thus is likely to be UGC 4570 (at redshift z = 0.0215)....
- ItemSupernova 2010jt(2010) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; McNaught, R. H.; Garradd, G.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.Report the discovery of an apparent supernova in Siding Spring Survey (SSS) images made public via the "Catalina Real-time Transient Survey" program: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010jt Nov. 6.57 23 43 41.24 -41 18 46.9 19.0 20".5 E, 29".6 N Further SSS magnitudes for 2010jt: Oct. 18.51 UT, [20.5 (co-added image); Nov. 7.50, 19.0. The likely host galaxy, 6dFGS gJ234339.4-411917, has redshift z = 0.053....
- ItemSupernova 2010ks in UGC 5622(2010) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.Report the CRTS discovery of an apparent supernova in public images from Catalina Sky Survey (CSS). SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010ks Dec. 11.46 10 23 42.44 +33 46 49.0 17.0 7".8 E, 22".0 N Further unfiltered CCD magnitude estimates of 2010ks: June 15.20 UT, [19.3 (CSS); Dec. 12.42, 17.4 (LB-1 0.6-m telescope at Rodeo, NM). The presumed host galaxy, UGC 5622, has redshift z = 0.033....
- ItemSupernova 2010ll(2010) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.Report the CRTS discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010ll Dec. 10.32 4 50 29.81 -10 44 17.0 18.1 11".8 W, 6".3 N Further CSS magnitudes for 2010ll: Nov. 16.39 UT, [20.4; Nov. 30.35, 19.0....
- ItemSupernova 2011af = Psn J02255436+1023111(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Hsiao, E. Y.Report the Catalina Real-time Transient Survey's discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011af Jan. 11.09 2 25 54.36 +10 23 11.1 16.7 4" W, 1" N Further CSS magnitude estimates for 2011af: 2010 Dec. 10.21 UT, [19.0; 2011 Jan. 5.15, 16.5. This object was designated PSN J02255436+1023111 when posted at the Central Bureau's TOCP webpage by Drake, and based on the spectroscopy below is here designated SN 2011af. Kuiyun Huang and Yoichi Ohyama, Institute of Astronomy and Astrophysics, Academia Sinica; Chia-Jung Chuang, Yuji Urata, and Induk Lee, National Central University, Taiwan; and Eric Y. Hsiao, Lawrence Berkeley National Laboratory, report that the inspection of a CCD spectrum (range 400-900 nm), obtained on Jan. 29.5 UT with the 1.8-m Ritchey Cretien reflector and medium dispersion spectrometer at Bohyunsan Optical Astronomy Observatory, Korea, shows that SN 2011af is a type-IIn supernova. The spectrum consists of a flat continuum and prominent narrow emission lines of the Balmer series (H-alpha FWHM of about 1500 km/s), with the narrow peaks yielding a redshift of 0.064. The "superfit" program of Howell et al. (2005, Ap.J. 634, 1190) shows its spectrum to be an excellent match to that of SN 1988Z. SN 2011af is measured to have a magnitude r' about 17.2 on Feb. 7.46 UT with the 1-m telescope at the Lulin Observatory in Taiwan; this corresponds to an absolute magnitude of about -20, nearly a month past its initial discovery....
- ItemSupernova 2011an in UGC 4139 = Psn J07592442+1625082(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Marion, G. H.; Calkins, M.Report the Catalina Real-time Transient Survey's discovery of an apparent supernova in public images from the Catalina Sky Survey. SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011an Mar. 1.19 7 59 24.42 +16 25 08.2 18.4 11".6 E, 8".5 S This object was designated PSN J07592442+1625082 when posted on the Central Bureau's TOCP webpage and is here designated SN 2011an based on the spectroscopy reported below. Further unfiltered CCD magnitudes for 2011an: Jan. 28.26 UT, [20.5 (Mt. Lemmon Survey); Mar. 2.13, 16.9 (Howerton, 0.2-m telescope); Mar. 3.269, 15.7 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera at New Mexico Skies Observatory, Mayhill, NM, U.S.A.; position end figures 24s.38, 09".1). Brimacombe has posted his image at URL http://www.flickr.com/photos/43846774@N02/5493974475/. The presumed host galaxy is UGC 4139 = PGC 22391. G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of PSN J07592442+1625082 = 2011an was obtained on Mar. 5 UT by M. Calkins with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011an is a type-IIn supernova, similar to SN 2001fa near maximum light....
- ItemSupernova 2011bg = Psn J11561431+2521119(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Marion, G. H.Report the Catalina Real-time Transient Survey's discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS). SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011bg Mar. 26.34 11 56 14.31 +25 21 11.9 16.7 1" N This variable was designated PSN J11561431+2521119 when posted at the Central Bureau's TOCP webpage and is here designated SN 2011bg based on the spectroscopic report below. Further unfiltered CCD magnitudes for 2011bg: Mar. 5.33 UT, [18.4 (CSS); 28.31, 16.3 (remotely using a 0.5-m LB-1 telescope at Rodeo, NM, U.S.A.). G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that a spectrum (range 340-740 nm) of PSN J11561431+2521119 = SN 2011bg was obtained on Apr. 2 UT by Marion with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011bg is a type-Ia supernova of the 1991T-like sub-class at a few days before maximum light. Using a redshift of z = 0.0322, measured from host-galaxy emission lines, the velocity of the Si II 635.5-nm feature is estimated to be approximately 10500 km/s....
- ItemSupernova 2011bn = Psn J16164236+0014299(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Tomasella, L.; Benetti, S.; Bufano, F.Report the discovery via the Catalina Real-time Transient Survey (CRTS) of an apparent supernova in public images from the Catalina Sky Survey (CSS). This variable was designated PSN J16164236+0014299 when posted on the Central Bureau's TOCP webpage and is here designated SN 2011bn based on the spectroscopic confirmation reported below. SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011bn Mar. 8.46 16 16 42.36 + 0 14 29.9 18.9 17".9 W, 16".9 S Further unfiltered CCD magnitudes for 2011bn: Feb. 11.52 UT, [19.7 (CSS); Mar. 9.50, 17.9 (remotely using a 0.5-m LB-1 telescope near Rodeo, NM, U.S.A., by the CRTS team); 10.430, 18.0 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K camera at New Mexico Skies Observatory, Mayhill, NM, U.S.A.; position end figures 42s.54, 28".6). Brimacombe has posted his image at the following website URL: http://www.flickr.com/photos/43846774@N02/5515332321/. L. Tomasella and S. Benetti, Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Padova; and F. Bufano, INAF, Osservatorio Astronomico di Catania, on behalf of a larger collaboration, report that a spectrum of 2011bn = PSN J16164236+0014299, obtained on Apr. 10.41 UT with the New Technology Telescope (+ EFOSC2; range 340-750 nm, resolution 1.3 nm), shows it to be a type-II supernova. The best fits to this noisy spectrum found by GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; publicly available at https://gelato.tng.iac.es) are with spectra of type-II supernovae at about one month post explosion, adopting a recession velocity of 9183 km/s for UGC 10306 (Bottinelli et al. 1993, A.Ap. 102, 57; via NED)....
- ItemSupernova 2011cg(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Marion, G. H.; Berlind, P.Report the Catalina Real-time Transient Survey's discovery of an apparent supernova in unfiltered Catalina Sky Survey images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011cg Apr. 14.33 14 59 09.25 + 7 18 04.2 15.7 2" W, 1" S G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of 2011cg was obtained on May 5 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011cg is a type-Ia supernova about two weeks after maximum light....
- ItemSupernova 2011D in UGC 2498(2011) Narla, A.; Cenko, S. B.; Li, W.; Filippenko, A. V.; Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Marion, G. H.; Challis, P.; Berlind, P.Via public images from the Catalina Sky Survey (CSS). 2011 UT R.A. (2000.0) Decl. Mag. Offset Observers Jan. 5.09 3 02 14.58 +17 20 58.9 18.2 33".8 E, 14".7 N CSS Jan. 6.30 3 02 14.53 +17 20 58.3 18.2 34".4 E, 14".8 N KAIT Additional magnitudes for 2011D: 2010 Dec. 8.32 UT, [19.3 (KAIT); 10.19, [19.4 (CSS); 2011 Jan. 7.21, 18.2 (KAIT); 8.13, 17.8 (S. Howerton, remotely with the LB-1 0.6-m telescope near Rodeo, NM, U.S.A.). Drake notes that the presumed host galaxy, UGC 2498, has redshift z = 0.0231. G. H. Marion and P. Challis, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) was obtained of 2011D on Jan. 8 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011D is a type-IIb supernova a few days before maximum light....
- ItemSupernova 2011ds = Psn J20022093-2013134(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; McNaught, R. H.; Garradd, G.; Beshore, E. C.; Larson, S. M.; Christensen, E.; Valenti, S.; Benetti, S.Report the discovery of an apparent supernova in public images from the Catalina Sky Survey; it was confirmed in images obtained with the Siding Spring Survey (SSS). SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011ds May 13.42 20 02 20.93 -20 13 13.4 16.6 6" W, 17" N The variable was designated PSN J20022093-2013134 when posted at the Central Bureau's TOCP webpage and is here designated SN 2011ds based on the spectroscopic confirmation that is detailed below. Further magnitudes for 2011ds: Apr. 11.74 [19.0 (SSS); May 14.69, 16.6 (SSS); 15.721, 16.6 (Joseph Brimacombe, Coral Towers Observatory, Cairns, Australia, 30-cm telescope + STL6K camera + red filter; position end figures 20s.92, 12".8). Brimacombe's image is posted at URL http://www.flickr.com/photos/43846774@N02/5724709574/. S. Valenti and S. Benetti, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on behalf of a larger collaboration, report that a low-signal-to-noise spectrogram (range 330-750 nm; resolution 1.5 nm) of PSN J20022093-2013134 = SN 2011ds, obtained on June 26.43 UT with the European Southern Observatory's New Technology Telescope (+ EFOSC2), is consistent with that of a type-II supernova. The spectrum indeed shows strong hydrogen H-alpha at 669.1 nm, mainly in emission with a full-width-at-half-maximum of about 7400 km/s....
- ItemSupernova 2011ej(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Moskvitin, A. S.; Fatkhullin, T. A.; Komarova, V. N.; Sokolov, V. V.; Sokolova, T. N.Report the discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. 2011ej July 3.36 22 00 42.26 - 8 15 42.0 18.8 Further CSS magnitudes for 2011ej: June 4.44 UT, [20.3; 23.39, 18.9. A. S. Moskvitin, T. A. Fatkhullin, V. N. Komarova, V. V. Sokolov, and T. N. Sokolova, Special Astrophysical Observatory (SAO), Russian Academy of Sciences, report that a CCD spectrogram (range 380-790 nm; 1-nm resolution) was taken of 2011ej with the 6-m BTA telescope (+ Scorpio) on July 7 UT. The spectrum reveals strong H I and Fe II lines. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows matches with the spectrum of the type-II-P supernova 2004et at phase +6 days, redshifted to z = 0.042 +/- 0.004. The authors report magnitude V = 18.91 +/- 0.03 for 2011ej, obtained with the same instrument on July 7.988....
- ItemSupernova 2011ga in Pgc 69458 = Psn J22402742+0311580(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Valenti, S.; Benetti, S.; Tomasella, L.; Ochner, P.; Pastorello, A.; Marion, G. H.Report the discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011ga Sep. 18.25 22 40 27.42 + 3 11 58.0 17.3 18".2 W, 7".4 N The new object was designated PSN J22402742+0311580 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011ga based on the spectroscopic report below. Additional CCD magnitudes for 2011ga (unfiltered unless noted otherwise: July 2.38 UT, [19.3 (CSS); Sept. 19.179, 16.5 (Joseph Brimacombe, Cairns, Australia; infrared filter, wavelength > 700 nm; image posted at URL http://www.flickr.com/photos/43846774@N02/6177998402/); 19.320, 17.2 (Brimacombe; position end figures 27s.38, 58".9; image posted at website URL http://www.flickr.com/photos/43846774@N02/6168832131/). S. Valenti, S. Benetti, L. Tomasella, and P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica; and A. Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a larger collaboration, report that a spectrogram of PSN J22402742+0311580 = SN 2011ga, obtained on Sept. 24.91 UT, suggests that it is a type-Ia supernova observed close to B-band maximum. The velocity of the ejected material, as deduced from the position of the minimum of the Si II lines, is about 10600 km/s. G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of PSN J22402742+0311580 = 2011ga was obtained on Sept. 27 UT by Marion with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that the object is a type-Ia supernova a few days after maximum light. The best-fit template spectrum is that of SN 2003du at +2 days. The velocity of the Si II 635.5-nm feature is estimated to be approximately 10800 km/s, using the SNID estimated redshift of z = 0.040....
- ItemSupernova 2011gb = Psn J01334294+3448371(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Denisenko, D.; Brimacombe, J.; Valenti, S.; Benetti, S.; Tomasella, L.; Ochner, P.; Pastorello, A.Report the discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011gb Sep. 24.30 1 33 42.94 +34 48 37.1 16.1 4".5 W, 1".1 S The new object was designated PSN J01334294+3448371 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011gb based on the spectroscopic report below. Additional CCD magnitudes for 2011gb (unfiltered unless noted otherwise): Jan. 16.23, [18.5 (CSS); Sept. 24.850, 15.9 (D. Denisenko, Moscow, Russia; 0.20-m f/5 reflector + Meade DSI Pro II camera; position end figures 42s.84, 36".8; image posted at the following website URL: http://pics.livejournal.com/bigdenru/pic/000a957p/); 24.897, 15.5 (Paolo Corelli, Pagnacco, Italy; 0.45-m f/4.5 telescope; position end figures 42s.8, 36".8; nearby galaxy centered at position end figures 43s.35, 37".9); 25.187, 16.3 (J. Brimacombe, Cairns, Australia; position end figures 42s.86, 37".0; image posted at URL http://www.flickr.com/photos/43846774@N02/6186780582/); 26.875, 16.3 (Nick James, Chelmsford, Essex, England; Celestron 11 telescope + ST9XE camera; position end figures 42s.84, 36".9; UCAC-3 reference stars). S. Valenti, S. Benetti, L. Tomasella, and P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica; and A. Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a larger collaboration, report that a spectrogram of PSN J01334294+3448371 = SN 2011gb, obtained on Sept. 25.06 UT, suggests that it is a type-Ia supernova observed a few weeks after B-band maximum at a redshift z = 0.014....
- ItemSupernova 2011gf = Psn J21122427-0748521(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Valenti, S.; Benetti, S.; Tomasella, L.; Ochner, P.; Pastorello, A.; Marion, G. H.Report the discovery of an apparent supernova in unfiltered Catalina Sky Survey images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011gf Sep. 18.19 21 12 24.27 - 7 48 52.1 16.6 23".5 E, 21".8 N This variable was designated PSN J21122427-0748521 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011gf based on the spectroscopic report below. Joseph Brimacombe, Cairns, Australia, reports unfiltered CCD mag 16.1 and position end figures 24s.31, 51".8 from an image taken on Sept. 19.266 UT; he has posted his image at the following website URL: http://www.flickr.com/photos/43846774@N02/6167975455/. S. Valenti, S. Benetti, L. Tomasella, and P. Ochner, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica; and A. Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a larger collaboration, report that a spectrogram (range 360-810 nm; resolution 2.2 nm) of PSN J21122427-0748521 = SN 2011gf, obtained on Sept. 25.90 UT, suggestss that it is a type-Ia supernova. Cross-correlation with a library of supernova spectra via the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL https://gelato.tng.iac.es/login.cgi), suggest a normal type-Ia supernova close to the B-band maximum at a redshift of z = 0.0277 (Sloan Digital Sky Survey, via the NED website). The expansion velocity deduced from the Si II 635.5-nm minimum is about 11100 km/s. G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of PSN J21122427-0748521 = 2011gf was obtained on Sept. 27 UT by Marion with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011gf is a type-Ia supernova a few days after maximum light. The best-fit template spectrum is that of SN 2007F at +4 days. The velocity of the Si II 635.5-nm feature is estimated to be approximately 11600 km/s, using the SNID estimated redshift of z = 0.027....
- ItemSupernova 2011gi in Pgc 1981 = Psn J00324300+2606516(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; McNaught, R. H.; Garradd, G.; Beshore, E. C.; Larson, S. M.; Christensen, E.; Koff, R. A.; Marion, G. H.Report the discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS). SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011gi Sep. 21.27 0 32 43.00 +26 06 51.6 18.2 13".8 W, 13".6 S This variable was designated PSN J00324300+2606516 when it was posted on the Central Bureau's TOCP webpage and is here designated 2011gi based on the spectroscopic confirmation reported below. Additional unfiltered CCD magnitudes for 2011gi: June 10.44 UT, [19.5 (CSS); Sept. 23.151, 18.5 (Joseph Brimacombe, Cairns, Australia; position end figures 43s.00, 51".2; image posted at URL http://www.flickr.com/photos/43846774@N02/6177438626/); 23.246, 17.9 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 Schmidt-Cassegrain reflector + Apogee AP-47p CCD camera; thirty stacked 60-s images; limiting mag 20.5; image scale 2"/pixel; position end figures 42s.97, 51".2, UCAC3 reference stars). G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of PSN J00324300+2606516 = 2011gi was obtained on Sept. 27 UT by Marion with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011gi is a type-Ia supernova about 40 days after maximum light. The best-fit SNID templates are for 1991T-like type-Ia supernovae between 37 and 45 days post-maximum at z = 0.034....
- ItemSupernova 2011gp in UGC 3119 = Psn J04390804+1131516(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Valenti, S.; Cappellaro, E.; Benetti, S.; Turatto, M.; Pastorello, A.Report the discovery of an apparent supernova in public images from the Mount Lemmon Survey: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011gp Sep. 30.45 4 39 08.04 +11 31 51.6 18.4 5".1 E, 1".7 N This variable was designated PSN J04390804+1131516 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011?? based on the spectroscopic report below. S. Valenti, E. Cappellaro, S. Benetti, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica (INAF); M. Turatto, Osservatorio Astronomico di Trieste, INAF; and A. Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a larger collaboration, report that a spectrogram (range 360-810 nm; resolution 2.2 nm) of PSN J04390804+1131516 = SN 2011gp, obtained on Sept. 30.95 UT with the Ekar-Copernico 1.82-m telescope (+ AFOSC), shows a red continuum, strong H_alpha emission, Na I D, and other lines typical of type-II supernovae. Cross-correlation with a library of supernova spectra via the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024), suggests that 2011gp is a couple of months after maximum light....
- ItemSupernova 2011gq = Psn J21422844-1606305(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; McNaught, R. H.; Garradd, G.; Beshore, E. C.; Larson, S. M.; Christensen, E.; Magill, L.; Kotak, R.; Nielsen, M. B.Report the discovery of an apparent supernova in public images from the Mount Lemmon Survey. SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011gq Sep. 26.24 21 42 28.44 -16 06 30.5 19.2 9".4 W, 7".6 N This variable was designated PSN J21422844-1606305 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011gq based on the spectroscopic report below. Joseph Brimacombe, Cairns, Australia, reports position end figures 28s.38, 30".5 from an unfiltered CCD image taken on Sept. 27.265 UT (image at URL http://www.flickr.com/photos/43846774@N02/6191438300/). Additional unfiltered CCD magnitudes for 2011gq: Sept. 28.870, 19.2 (Federica Luppi and Luca Buzzi, Varese, Italy, 0.38-m f/6.8 reflector; position end figures 28s.41, 30".0; CMC-14 catalogue reference stars; image posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_P902335.jpg); 29.214, 19.8 (Brimacombe; image posted at http://www.flickr.com/photos/43846774@N02/6196354104/). L. Magill and R. Kotak, Queen's University, Belfast, report that an optical spectrogram (range 350-900 nm) of PSN J21422844-1606305 = SN 2011gq was obtained at the Nordic Optical Telescope (+ ALFOSC) by M. B. Nielsen on Sept. 28.85 UT. After cross-correlated with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024), the best fit was with a normal type-Ia supernova and similar to SN 1998aq at an epoch of 66 days (Branch et al. 2003, A.J. 126, 1489). Fitting with SNID yields a redshift of 0.053....