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Sixteen confirmed SNe from CRTS

ATel #3340; A. J. Drake, S. G. Djorgovski, A. A. Mahabal, M. J. Graham, R. Williams, C. Donalek (Caltech); J. Prieto (Carnegie Obs); M. Catelan (PUC); E. Christensen (Gemini Obs); E. C. Beshore, S. M. Larson (LPL/UA); R. H. McNaught (ANU)
on 12 May 2011; 04:04 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 3343, 3354, 3416

Further to ATel#3324, we report the spectroscopic classification of 16 supernovae observed with the Palomar 5m+DBSP on May 7 and May 8 UT.

CRTS ID RA Dec SN type z
MLS110507:145837+022059 14:58:37.10 02:20:59.1 Ia 0.16
CSS110504:121124+372552 12:11:24.09 37:25:52.5 IIP 0.06
CSS110504:122228+374940 12:22:27.90 37:49:39.5 IIP 0.06
CSS110502:121422+335510 12:14:22.16 33:55:09.5 Ia 0.11
CSS110501:094825+204333 09:48:24.79 20:43:33.2 IIn 0.04
MLS110430:143337-120221 14:33:37.37 -12:02:20.9 Ia 0.11
MLS110430:113511+010021 11:35:10.63 01:00:20.9 Ia-pec 0.08
CSS110427:150634-101937 15:06:34.40 -10:19:36.5 Ia 0.11
CSS110427:120801+491333 12:08:01.08 49:13:33.0 Ic 0.10
CSS110426:220452+124613 22:04:51.77 12:46:13.0 Ia 0.05
MLS110426:075233+215330 07:52:32.61 21:53:29.7 IIn 0.39
CSS110424:135532-023001 13:55:31.54 -02:30:00.5 Ia 0.09
CSS110414:171419+435955 17:14:19.18 43:59:55.2 Ia 0.03
CSS110204:082649+202232 08:26:49.16 20:22:31.8 IIP 0.03
SNHunt52 09:16:21.65 -23:37:17.4 IIP 0.01
SNHunt53 12:16:07.15 -03:34:30.7 II-pec 0.02

Using SNIDS cross-correlation code (Blondin and Tonry 2007, ApJ, 666, 1024) the spectrum of  
SNhunt53 was found to be most similar to SN1987A 73 days before peak brightness. This event was 
detected at magnitude V=18.9, corresponding to Mv=-15.6 based on the host galaxy's distance and 
foreground reddening (Av=0.1). The observed faint magnitude appears consistent with this being an 
under-luminous 87A-like event. However, further follow-up is necessary. 
SNHunt52 was discovered at magnitude V=18, corresponding to Mv=-15.4 based on the host galaxy's  
distance and foreground extinction (Av=0.4). Additional monitoring of the object shows a consistent  
brightness. The spectrum of this object has low S/N, but does not appear to show the strong extinction  
that would be expected if the low-luminosity was due to host reddening. 
The lightcurve of MLS110426:075233+215330 exhibits a long (65 day) rise that appears common in  
bright type-IIn supernovae. After accounting for the host galaxy flux and foreground extinction 
(Av=0.2), we find that the event peaked at Mv=-21.7. 

Finding charts for these events can be found at "http://voeventnet.caltech.edu/feeds/ATEL/CRTS". All CRTS discoveries are found through the real-time processing of Catalina Sky Survey data and are immediately made available from links found at "http://crts.caltech.edu/" and "http://Skyalert.org".