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CRTS Supernova Candidates

ATEL # 1823; A.J. Drake, M.J. Graham, S.G. Djorgovski, A. Mahabal, R. Williams (Caltech); M. Catelan (PUC); E.C. Beshore, S.M. Larson, R.Hill (LPL/UA); E. Christensen (Gemini Observatory)
on 30 Oct 2008; 17:31 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Andrew J. Drake (

Subjects: Request for Observations, Nova, Supernova, Transients

We have detected four supernova candidates in CSS images from UT dates Oct 9th, 29th and 30th. The detections have the following parameters:

CSS081030:011341+044717 2008-10-30 UT 05:12:43 RA 01:13:41.49 Dec 04:47:18.0 Mag 17.7 Type SN
CSS081030:043655-002136 2008-10-30 UT 08:34:57 RA 04:36:55.20 Dec -00:21:35.6 Mag 18.0 Type SN?
CSS081029:224444-030851 2008-10-29 UT 04:52:02 RA 22:44:43.69 Dec -03:08:51.1 Mag 18.3 Type SN
CSS081009:002151-163204 2008-10-09 UT 05:49:20 RA 00:21:51.39 Dec -16:32:03.8 Mag 18.5 Type SN?

CSS081030:011341+044717 is associated with an anonymous galaxy. This supernovae candidate is also seen in images from Sept 21, Sept 29 and Oct 8 UT. No objects are seen in prior PQ, DSS1 and DSS2 images to mag ~21. CSS081029:224444-030851 is near galaxy APMUKS B224209.38-032444.7 (mag 18.2). No transients are present in earlier epochs of CSS, imaging including data taken on or before the 1st Oct (to mag ~20) or in prior PQ, DSS1 and DSS2 images. CSS081009:002151-163204 is possibly a supernova based on CSS photometry from Oct 2, 9, and 27 UT. CSS081030:043655-002136 is possibly a supernova based on CSS photometry from Oct 6, 9, and 30 UT. However, as a possible associated point sources are seen in DSS images for CSS081009:002151-163204 and CSS081030:043655-002136 other sources of variability cannot not yet be ruled out. We request follow-up observations.

Further to ATel#1734, additional CSS and P60 photometry of CSS080921:012706+031305 suggest this object is a supernova.

For finding charts and discovery images please see:
Current candidate and confirmed SNe can be found here.
CRTS optical transients are detected and published as VOEvents in real-time at and in RSS here

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R. E. Rutledge , Editor
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