Supernova candidates from CRTS

ATel #1860; A. J. Drake, S. G. Djorgovski, A. Mahabal, R. Williams, M. J. Graham, (Caltech); M. Catelan (PUC); E. C. Beshore, S. M. Larson, R. Hill, A. Boattini (LPL/UA); E. Christensen (Gemini Observatory);
on 4 Dec 2008; 19:24 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

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We have detected four supernova candidates with in CSS images from UT dates Oct 30th, Nov 19th and Dec 1st. The detections have the following parameters:

CSS081030:100500+142250	2008-10-30 UT 12:16:40	RA 10:05:00.27	Dec 14:22:49.9	Mag 18.2	Type SN
CSS081119:015930-012621	2008-11-19 UT 05:00:07	RA 01:59:30.24	Dec -01:26:21.3	Mag 17.7	Type SN
CSS081201:013055-014208	2008-12-01 UT 05:50:37	RA 01:30:54.78	Dec -01:42:08.1	Mag 18.1	Type SN
CSS081201:023759+013029	2008-12-01 UT 06:36:30	RA 02:37:59.31	Dec 01:30:29.3	Mag 18.4	Type SN

CSS081030:100500+142250 matches an SDSS object with magnitudes u=22.60, g=22.93, r=22.30, i=22.42, z=21.37. This object was seen in CSS and P60 images from Oct 30, Oct 31 and Nov 7 UT. CSS081119:015930-012621 appears to be associated with a faint object with mag ~21.5 seen in prior PQ coadds. This transient was seen in CSS and P60 images from Nov 19, Nov 20, Dec 1 and Dec 2 UT. CSS081201:013055-014208 does not show the presence of a host galaxy in past PQ coadd images reaching mag ~22. This object is seen in CSS and P60 images from Nov 19, Dec 1 and Dec 2 UT. CSS081201:023759+013029 appears to be associated with a faint object of mag ~21.5 is seen in prior PQ coadds. This candidate is seen in CSS and P60 images from Nov 17, Nov 20 and Dec 2 UT. From P60 follow-up, both CSS081201:013055-014208 and CSS081201:023759+013029 have colours consistent with young SN-Ia.

The discoveries of these SN candidates associated with faint host galaxies is consistent with other supernova recently detected by CRTS, namely:
CSS081122:094326+251021 (SN 2008hp) ATel#1856,
CSS081106:091244+095548 (SN 2008hk),
CSS081030:043655-002136 ATel#1823,
CSS081009:002151-163204 ATel#1823, ATel#1833 and ATel#1842,
CSS080924:040630+145214 (SN 2008gn) ATel#1778,
CSS080923:011149+143826 (SN 2008fr) ATel#1734,
CSS080921:012706+031306 (SN 2008gs) ATel#1734,
CSS080922:231617+114248 (SN 2008fz) ATel#1734,
CSS080920:005959-090032 (SNF20080918-004).
However, other sources of variability are possible.

We request photometric and spectroscopic follow-up.

For finding charts and discovery images please see: http://voeventnet.cacr.caltech.edu/feeds/ATEL/CRTS.
Current candidate and confirmed SNe can be found here.