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A persistent flaring transient from CRTS

ATEL # 1741; A. Mahabal, A.J. Drake, S.G. Djorgovski, R. Williams, M.J. Graham (Caltech); E.C. Beshore, S.M. Larson, R. Hill (LPL/UA); M. Catelan (PUC); E. Christensen (Gemini Observatory);
on 26 Sep 2008; 0:16 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Ashish Mahabal (

Subjects: Optical, Request for Observations, Transients

CSS080924:233423+391423 is a transient discovered by CRTS on 24 Sep 2008 UT 03:50:32. The discovery images indicated flaring on a scale of minutes with the four 30 second images separated by 10 minutes registering V magnitudes of 19.8, 19.4, 18.2 and 19.4. Combined CSS images from the past do not reveal any source at that location. There is a barely visible source in N band DPOSS plate (near-IR) but no source is visible in 2MASS or other DPOSS plates. Subsequent imaging at the Palomar 60-inch telescope yields magnitudes of 18.6, 18.4, 18.0 and 18.9 in Gunn g, r, i and z bands respectively (25 Sep 2008 UT 02:55:27).
CSS080924:233423+391423 2008-09-24 UT 04:11:44 RA 23:34:23.13 Dec +39:14:23.1 Mag 18.2 ?
The nature of this object is not clear since despite the flaring and fading it has persisted for 24 hours. Further observations are requested.
A finding chart and discovery images can be found at:

CRTS optical transients are detected and published as VOEvents in real-time at

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R. E. Rutledge , Editor
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