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Catalina/Palomar Optical Transient

ATEL # 1604; A. Mahabal, A.J. Drake, S.G. Djorgovski, R. Williams, M.J. Graham (Caltech); E.C. Beshore, S.M. Larson (LPL/UA); E. Christensen (Gemini Observatory)
on 6 Jul 2008; 8:45 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Andrew J. Drake (

Subjects: Optical, Nova, Supernova, Transients

We have detected a brightening optical transient in Catalina and Palomar images starting from 23 Jun 2008 UT. The object has the following parameters:

CSS080623:142206+334546 2008-06-23 UT 06:53:42 RA 14:22:05.77 Dec 33:45:46.1 Mag 18.3 Type SN?

A very faint uncataloged source appears to be located near this position in SDSS images. Follow-up images with the Palomar 60" have been taken and the following Gunn-r magnitudes found: Jun 25.2, 18.6; Jun 27.4, 18.5; Jun 28.2, 18.4; Jul 2.2, 18.15. No objects are present in earlier epochs of CSS imaging including data taken on the 14th May UT (to mag ~20). No objects are seen in DSS-1 and DSS-2 images. This may be a Supernova with a very faint host galaxy or something more exotic. We request photometric and spectroscopic follow-up.

For finding charts and discovery images please see:
Stationary CSS 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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