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Six more optical transients from CSS

ATEL # 1413; E. Glikman, C. Donalek, A. Mahabal, R. Williams, S.G. Djorgovski, M.J. Graham, A.J. Drake (Caltech); E.C. Beshore, S.M. Larson (LPL/UA); E. Christensen (Gemini Observatory)
on 5 Mar 2008; 9:36 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Andrew J. Drake (

Subjects: Optical, AGN, Nova, Supernova, Transients, Variables
Referred to by ATEL #: 1416

We have processed six additional optical transients in Catalina Sky Survey (CSS) images obtained at the Mt. Bigelow 0.7m Catalina Schmidt Telescope between 30 Jan - 03 Mar 2008 UT. The CSS discovery observations consist of four images spanning ~30 minutes. The transients were unresolved, and at the following J2000 coordinates:

CSS080303:075520+203908 2008-03-03 UT 03:04:14 RA 07:55:19.52 Dec 20:39:08.0 Mag 19.2
CSS080229:115214+301037 2008-02-29 UT 08:10:57 RA 11:52:14.19 Dec 30:10:37.0 Mag 19.1
CSS080228:105301-075656 2008-02-28 UT 07:55:02 RA 10:53:00.81 Dec -07:56:56.0 Mag 19.2
CSS080228:142427-063345 2008-02-28 UT 12:12:46 RA 14:24:26.63 Dec -06:33:45.0 Mag 18.7
CSS080130:021110+171624 2008-01-30 UT 03:38:17 RA 02:11:10.22 Dec 17:16:24.0 Mag 14.4
CSS080219:151457+234110 2008-02-19 UT 11:26:29 RA 15:14:56.75 Dec 23:41:10.0 Mag 18.1

For finding charts and discovery images please see:

The first transient is also seen in CSS images from Feb 6 UT, but not images from (or prior to), Jan 30 UT. No source is present in Palomar-Quest and SDSS images to ~23 mag. This is possibly a supernova.
The second transient is seen in all four CSS images but has low S/N. This transient was approximately 1.5 mags fainter in a prior coadd of 20 CSS images from a range of epochs. This transient is possibly an AGN.
The third transient is not present in prior CSS, DSS or PQ coadd images to mag ~23. This is possibly a supernova.
The fourth transient is seen in past CSS and PQ coadds. Images from February 3 UT show the object was ~3 mags brighter than in coadded prior CSS images. This may be an AGN or SN.
The fifth transient is significantly variable. Past CSS images show that the object varying by as much as four magnitudes. This transient coincides with a faint IRAS source. It is present in past PQ and DSS source but is not visible in 2MASS images.
The sixth transient is present in CSS images from Jan 1st and Feb 8th UT when it was mags 16.6 and 17.7, respectively. There is no clear source in DSS, PQ, and SDSS images covering its location. This is possibly a supernova.

Photometric and spectroscopic follow-up is requested.

All stationary CSS optical transients are detected and published as VOEvents in real-time at and here (RSS)

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