Browsing by Author "Larson, S. M."

Now showing 1 - 20 of 91
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    A Supernova Candidate from the Siding Spring Survey
    (2010) Drake, A. J.; Djorgovski, S. G.; Mahabal, A. A.; Graham, M. J.; Williams, R.; Prieto, J.; Catelan , Marcio; Christensen, E.; McNaught, R.; Garradd, G.; Beshore, E. C.; Larson, S. M.
    We report the discovery of the first supernova candidate from the Siding Spring Survey (SSS) by the Catalina Real-time Transient Survey (CRTS). The detection has the following details: <table border=1 width=650 align=center> <tr><th>ID</th><th>Disc. Date</th><th>RA</th><th>Dec</th><th>Disc. Mag</th></tr> <tr align=center><td><a href='http://crts.caltech.edu/ATEL/SSS/1005080151534122262.atel.html'> SSS100508:210144-143830</a></td><td> 2010-05-08 </td><td> 21:01:44.10 </td><td> -14:38:30.5 </td><td> 16.4</tr> </table> The host galaxy, 2MFGC 15924 (=PGC 187888), has redshift z=0.0275 (Jones et al....
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    Discovery and Classification of Transients from CRTS-II
    (2016) Drake, A. J.; Djorgovski, S. G.; Mahabal, A. A.; Graham, M. J.; Stern, D.; Catelan, Márcio; Christensen, E.; Larson, S. M.
    Following on from the Catalina Real-time Transient Survey (CRTS), the CRTS-II project has begun to search for transients and highly variable sources. As with CRTS, all detections will be made public immediately following discovery....
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    Discovery of Thousands of RR Lyrae by the Catalina Surveys
    (2013) Drake, Andrew J.; Djorgovski, S. G.; Catelan, Márcio; Torrealba, G.; Graham, M.; Mahabal, A. A.; Donalek, C.; Prieto, J.; McNaught, R.; Larson, S. M.; Christensen, E.; Beshore, E. C.
    We have performed an extensive search for RR Lyrae among the 500 million sources observed by the Catalina Surveys. We detect 23,000 type-ab RR Lyrae (of which 18,700 are new discoveries) from a region spanning 3/4 of the sky. By combining calibrated Catalina photometry with RR Lyrae absolute magnitude estimates, we derive accurate distances and investigate the spatial distribution of structures within the Galactic halo. We identify hundreds of new RR Lyrae belonging to the Sagittarius tidal streams system and compare their observed properties with predictions from existing N-body models. We discover significant evidence that firmly establishes the existence of a tidal stream reaching Galactocentric distances beyond 100 kpc. This stream remains to be explained by any Sagittarius model. For 1,500 of the RR Lyrae we find matches with targets observed by past SDSS spectroscopic surveys. Combining the radial velocities and metallicity estimates from the SDSS spectra, with photometric distances, we investigate the kinematics and abundances of halo tidal stream populations....
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    Sixty Thousand Periodic Variables from the Catalina Surveys
    (2014) Drake, Andrew J.; Graham, M.; Djorgovski, S. G.; Catelan, Marcio; Mahabal, A. A.; Prieto, J.; Donalek, C.; Christensen, E. J.; Larson, S. M.; Boattini, A.; Gibbs, A.; Grauer, A. D.; Hill, R.; Kowalski, R.; Johnson, J.; Shelly, F.; Torrealba, G.
    We have performed an in-depth search for periodic variable stars within the photometry from the Catalina Surveys Data Releases. Our analysis reveals ~40,000 new periodic variable stars with brightness ranging from V=11 to 20, from a region covering ~20,000 square degrees on the sky. Each source is classified based on lightcurve morphology and multi-color photometry from WISE and SDSS. The variable stars discovered include eclipsing binaries, such as Algol, beta Lyrae, W UMa and WD+dM types, and pulsators including delta Scuti's, SX Phe, LPVs, RR Lyrae and Cepheids. We combine these sources with type-ab RR Lyrae from our prior analysis to produce a periodic variable catalog containing 60,000 stars. Using ~5,500 optical spectra from SDSS DR10 we determine the metallicities, surface gravities and radial velocities of the major types. The photometry, classifications and periods will all be made publicly available through the Catalina Surveys data release website....
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    Supernova 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....
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    Supernova 2010hj in Pgc 67413
    (2010) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; McNaught, R. H.; Garradd, G.; Howerton, S.; Prieto, J. L.; Catelan , Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.
    Report the discovery of an apparent supernova in unfiltered Siding Spring Survey (SSS) images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010hj Aug. 4.61 21 49 09.84 -59 02 23.2 17.1 5".5 W, 8".2 S Nothing was visible at this position on an SSS image from 2009 Oct. 1.50 UT (limitiing mag 18.9), but 2010hj was detected again in SSS images on Aug. 29.59 (no magnitude provided). The host galaxy appears to be PGC 67413 = ESO 145-G16. Joseph Brimacombe, Cairns, Australia, reports that ten stacked 600-s CCD images (limiting magnitude 20) taken remotely with a 32-cm RCOS telescope (+ STL6K camera + clear filter) at the Macedon Ranges Observatory near Melbourne, Australia, on Aug. 29.727 show the new object to be at mag 18.3 and located approximately 7" west and 7" south of the presumed host-galaxy nucleus. Another stacked image (seven 1200-s frames; limiting magnitude 20), taken by Brimacombe on Sept. 2.636 with a 40-cm RCOS telescope (+ U16 camera + red filter) at the Coral Towers Observatory (Cairns), yields mag 18.6 for 2010hj; the Sept. 2 stacked image has been posted at the following website URL: http://www.flickr.com/photos/43846774@N02/4952444311/....
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    Supernova 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)....
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    Supernova 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....
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    Supernova 2010kq in UGC 1769
    (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 the Catalina Sky Survey (CSS). SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010kq Dec. 7.23 2 18 10.92 +37 05 42.4 18.3 0".3 E, 4".9 S After posting on the CBAT's unconfirmed-objects webpage, Markku Nissinen and Veli-Pekka Hentunen (Varkaus, Finland) report that their exposures (limiting mag R = 18.9; 3-sigma) taken on Dec. 9 remotely with a 51-cm f/6.8 GRAS011 Global-Rent-a-Scope (+ FLI ProLine PL-11002M camera) near Mayhill, NM, USA, yield position end figures 11s.05, 39".9 for 2010kq (which is 1".5 east and 6".1 south of the center of the galaxy UGC 1769); they note that nothing is visible at this position on a red Palomar Sky Survey F plate. Further CCD magnitude estimates for 2010kq (unfiltered unless otherwise noted): Nov. 15.20 UT, [19.5 (CSS); Dec. 9.088, R = 16.4 +/- 0.1 (Nissinen and Hentunen); 9.14, 16.4 (Howerton; remotely using the LB-1 0.6m telescope at Rodeo, NM, U.S.A.). Drake notes that the presumed host galaxy, UGC 1769, has redshift z = 0.027....
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    Supernova 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....
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    Supernova 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....
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    Supernova 2010lr
    (2011) 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 CRTS discovery of an apparent supernova in unfiltered Siding Spring Survey (SSS) images: SN 2010 UT R.A. (2000.0) Decl. Mag. Offset 2010lr Dec. 30.46 0 02 35.50 -30 43 52.4 18.0 19".4 E, 13".3 N Further SSS magnitudes for 2010lr: 2010 Nov. 4.58 UT, [20.1; Dec. 28.47, 17.9. The presumed host galaxy, 2MASX J00023401-3044061, has redshift z = 0.062....
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    Supernova 2010lu
    (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.
    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 2010lu Dec. 8.40 9 06 00.70 +29 20 32.5 16.8 5".8 E, 8".3 S Further CSS magnitudes for 2010lu: 2010 Nov. 7.51 UT, [19.5; 2011 Jan. 3.34, 17.1. The presumed host galaxy, SDSS J090600.26+292041.0, has redshift z = 0.023....
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    Supernova 2011ae in MCG -03-30-19 = Psn J11544925-1651436
    (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.; Sahu, D. K.; Arora, S.; Anto, P.
    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 2011ae Feb. 12.43 11 54 49.25 -16 51 43.6 15.5 4".9 W, 8".4 N Further unfiltered CCD magnitude estimates for 2011ae: Feb. 5.46 UT, [18.5 (CSS); 13.41, 15.3 (remotely with the LB3 0.35-m telescope at Rodeo, NM, U.S.A.). Drake writes that the presumed host galaxy has redshift z = 0.0060. The object was given the designation PSN J11544925-1651436 when posted by Drake on the Central Bureau's TOCP webpage, and based on the spectroscopy below is here assigned the final designation SN 2011ae. D. K. Sahu, S. Arora, and P. Anto, Indian Institute of Astrophysics, Bangalore, report that a low-resolution spectrogram (range 350-930 nm) of 2011ae, obtained on Feb. 21.75 UT with the Indian Astronomical Observatory's 2-m Himalayan Chandra Telescope (+ HFOSC), shows it to be a normal type-Ia supernova, a few days before maximum light. Using the SNID code of Blondin and Tonry (2007, Ap.J. 666, 1024), the spectrum of 2011ae is found to best match that of SN 1990N at about 5 days before maximum light. Adopting a recession velocity of 1813 km/s for the presumed host galaxy (de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright Galaxies), MCG -03-30-19, the velocity corresponding to the Si II 635.5-nm absorption line is 12500 km/s....
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    Supernova 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....
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    Supernova 2011ag in Pgc 11943 = Psn J03122655+1915064
    (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.; Koff, R. A.; Hsiao, E. Y.; Suzuki, N.; Nugent, P. E.
    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 2011ag Feb. 25.15 3 12 26.55 +19 15 06.4 17.3 3".5 E, 20".0 N This object was designated PSN J03122655+1915064 on the Central Bureau's TOCP webpage, and is here designated SN 2011ag based on the spectroscopic report below. Further unfiltered CCD magnitudes for 2011ag: Feb. 4.11 UT, [20.4 (CSS); 27.089, 17.7 (R. A. Koff, Bennett, CO, U.S.A.; fourteen co-added 60-s images; position end figures 26s.55, 05".1). E. Y. Hsiao, N. Suzuki, and P. E. Nugent, Lawrence Berkeley National Laboratory, report that inspection of a CCD spectrum (range 350-980 nm), obtained on Feb. 27.25 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2011ag is a type-Ia supernova. The "superfit" software of Howell et al. (2005, Ap.J. 634, 1190) identified the spectrum as that of a type-Ia supernova around a week past maximum. The redshift matches that of the reported host galaxy (PGC 11943): z = 0.032. The spectrum closely resembles that of SN 1998bu at 10 days past maximum (Jha et al. 1999, Ap.J. Suppl. 125, 73)....
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    Supernova 2011al
    (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.
    Report the Catalina Real-time Transient Survey's discovery of a supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. 2011al Feb. 5.41 10 26 56.21 +18 29 07.4 18.7 Follow-up observations were performed with the Palomar 1.5-m with Gunn filters. Further magnitudes for 2011al: Jan. 26.45 UT, [19.7 (CSS); Feb. 14.16, g = 17.1, r = 17.3, i = 17.7, z = 17.8; Feb. 22.3, g = 17.0, r = 17.1, i = 17.8, z = 17.3; Feb. 23.28, 17.2 (CSS). Spectroscopic confirmation was obtained on Feb. 13.96 with the IGO 2-m telescope (+ IFOSC; range 350-850 nm). Cross- correlation with a library of spectra using the "Supernova Identification" code of Blondin and Tonry (2007, Ap.J. 666, 1024) reveals that 2011al is a type-Ia supernova near z = 0.06 and was most like SN 1999aa slightly after maximum. No host galaxy is seen in Sloan Digital Sky Survey images reaching Gunn r magnitude 22....
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    Supernova 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....
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    Supernova 2011be = Psn J09225262+2159157
    (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 2011be Mar. 25.14 9 22 52.62 +21 59 15.7 17.7 6".2 W, 43".7 N Further unfiltered CCD magnitude estimates of 2011be: Mar. 11.23 UT, [19.7 (CSS); 26.17, 17.1 (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 J09225262+2159157 = SN 2011be 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 the object is a type-Ia supernova near maximum light. Using a redshift of z = 0.0348, measured from host-galaxy emission lines, the velocity of the Si II 635.5-nm feature is estimated to be approximately 10700 km/s....
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    Supernova 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....