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Rapid Optical Transients from CRTS

ATel #3852; A. J. Drake, S. G. Djorgovski, A. A. Mahabal, M. J. Graham, R. Williams, C. Donalek (Caltech); J. Prieto (Princeton); M. Catelan (PUC Chile); E. Christensen (Gemini Obs); E. C. Beshore, S. M. Larson (LPL/UA)
on 7 Jan 2012; 23:14 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, Request for Observations, Transient, Variables

Further to ATel#3795, we report the discovery of eight rapid optical transients (OTs) by CRTS in data taken between 2011-12-24 and 2011-12-31 UT.

CRTS ID Disc. Date RA Dec Baseline Mag Peak Mag
CSS111231:031745-001651 2011-12-31 03:17:45.04 -00:16:50.8 19.3 16.9
CSS111230:061645+495133 2011-12-30 06:16:44.98 49:51:32.5 >20.5 16.3☆
CSS111230:032201+084357 2011-12-30 03:22:00.71 08:43:57.0 19.5 17.6☆
MLS111229:045931+154340 2011-12-29 04:59:31.14 15:43:40.4 18.5 16.1
SSS111228:052111-222717 2011-12-28 05:21:11.29 -22:27:17.0 16.2 12.8
MLS111228:040055+215521 2011-12-28 04:00:54.57 21:55:21.1 21.0 19.3
CSS111224:003027+180841 2011-12-24 00:30:26.75 18:08:41.1 20.3 17.0☆
CSS111224:035521+081626 2011-12-24 03:55:21.15 08:16:25.5 >20.5 15.8☆

☆ OTs followed photometrically with Palomar 1.5m telescope. CSS111224:035521+081626 was not detected  
in follow-up images. Finding charts and additional information for these events can be found at  

These OTs were all discovered in real-time by the CRTS pipeline and openly published to VOEvent network subscribers (such as "http://Skyalert.org"). All the objects were detected in outburst in at least three consecutive images taken over ~20 mins and vary significantly in brightness between observations. None of the sources exhibit past outbursts in archival Catalina data.

It is probable that these transients are regular UV Ceti variables, as is likely for recent the OTs MASTER OT103630.69-003523.8 (Lipunov et al. 2012, ATel#3844; Greiner et al 2012, ATel#3848) and LSQ11ei (Hadjiyska et al. 2011, ATel#3832). However, we encourage photometric and spectroscopic follow-up to probe the poorly explored nature of these rapid optical transients. Links to past rapid transient sources can be found at "http://crts.caltech.edu/".
We are grateful to the all the observers involved in follow-up observations.