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SN Candidates from CRTS

ATEL # 1937; A.J. Drake, A.A. Mahabal, S.G. Djorgovski, M.J. Graham, R. Williams (Caltech); M. Catelan (PUC); E.C. Beshore, S.M. Larson, A. Boattini, A. Gibbs, R. Hill, R. Kowalski (LPL/UA); E. Christensen (Gemini Observatory);
on 22 Feb 2009; 10:26 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Andrew J. Drake (

Subjects: Cataclysmic Variables, Nova, Supernova, Transients

The Catalina Real-time Transient Survey has so far discovered over six hundred significant optical transients. Here we report on seven probable SN discoveries made with CSS images between UT dates Jan 20th and Feb 19th. The objects have the following parameters:

CSS090219:095526-012821 2009-02-19 UT 06:31:00 RA 09:55:25.71 Dec -01:28:21.3 Mag 18.4 Type SN
CSS090216:100910+075434 2009-02-16 UT 08:46:52 RA 10:09:10.10 Dec 07:54:34.4 Mag 18.7 Type SN
CSS090214:102503+175821 2009-02-14 UT 09:27:34 RA 10:25:03.36 Dec 17:58:21.3 Mag 19.3 Type SN
CSS090213:083642+091405 2009-02-13 UT 06:17:24 RA 08:36:41.68 Dec 09:14:05.4 Mag 17.7 Type SN
CSS090213:030920+160505 2009-02-13 UT 03:45:55 RA 03:09:19.79 Dec 16:05:05.3 Mag 16.7 Type SN?
CSS090201:123216+085745 2009-02-01 UT 11:43:55 RA 12:32:15.80 Dec 08:57:45.4 Mag 19.1 Type SN
CSS090120:101435+263642 2009-01-20 UT 11:33:36 RA 10:14:34.97 Dec 26:36:42.2 Mag 19.3 Type SN

All candidates have been detected in CSS or P60 images on multiple nights. To remove contaminants such as AGN (cf. CFHT-COVET ATEL#1936), SN candidates are required to exhibit multi-magnitude rises above possible sources (observed in past deeper DSS, PQ, CSS and SDSS images), be well covered by past observations, show no signs of previous variability and not match radio sources seen in surveys such as NVSS and FIRST.

   CSS090219:095526-012821 is associated with an SDSS galaxy with u,g,r,i,z mags (23.2, 21.7, 21.5, 21.6, 21.9).   CSS090216:100910+075434 appears to be associated with an SDSS galaxy with mags (23.9, 22.2, 21.5, 21.2, 23.3).    It is possible that host galaxy is in fact SDSS J100911.91+075414.7 with mags (17.9, 16.3, 15.5, 15.1, 14.81) at z=0.071.   CSS090214:102503+175821 is associated with an SDSS galaxy with mags (18.9, 17.0, 15.9, 15.5, 15.1) and z=0.120.   Given the host redshift it is likely that the object is around peak magnitude.   CSS090213:083642+091405 is associated with an SDSS galaxy with mags (22.4, 20.9, 20.5, 20.9, 20.0).   CSS090213:030920+160505 is associated with a ~23rd magnitude object seen in the NOAO deep ecliptic survey. If    this is a supernova, its peak brightness was more than six magnitudes brighter than its host galaxy (like 2008hp).   CSS090201:123216+085745 is associated with an SDSS galaxy with mags (23.2, 22.6, 22.8, 22.7, 23.0).   CSS090120:101435+263642 is associated with an SDSS galaxy with g,r,i,z mags (22.6, 22.5, 22.0, 22.6).   

We request photometric and spectroscopic follow-up.

For finding charts, discovery images, lightcurves, etc., please see:
Current candidate and confirmed SNe can be found here.

Eleven new CVs were also discovered between Jan 20th and Feb 19th. All likely CV discoveries are given here.

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates