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Discovery of CV candidate ROTSE3 J004626+410714

ATEL # 1622; D. Chamarro, F. Yuan, M. D. Sisson, A Uecker, C. Akerlof, T. Mckay (U Mich.), A. Henden (AAVSO) report on behalf of the ROTSE collaboration
on 18 Jul 2008; 22:15 UT
Password Certification: Fang Yuan (

Subjects: Optical, Cataclysmic Variables, Transients

We report the discovery of optical transient ROTSE3 J004626+410714 in unfiltered CCD images taken by the 0.45m ROTSE-IIIb telescope at McDonald Observatory, Texas.

The object, located at RA: 00:46:25.65 Dec: +41:07:14.2 (J2000, uncertainty <1 "), was observed at ~15.4 mag on 2008 Jun 5.41 UT, ~16.8 mag on 2008 Jun 12.40 UT, and ~16.9 mag on 2008 Jun 15.38 UT. When imaged on 2008 Jun 22.37 UT and 2008 Jul 12.31 UT, it was fainter than a limiting magnitude of ~17.8 and ~18.8 respectively. The object's field was not imaged by ROTSE from 2008 Feb 27.09 UT to 2008 Jun 5.41 UT, and the object was not detected in any field image from 2007 Jan 8.78 UT to 2008 Feb 27.09 UT. This transient has a R~20.45 counterpart in USNO-B1.0 catalog. According to the crude photometry of the USNO-B catalog, it is bluer than the nearby field stars and thus is tentatively categorized as a galactic CV. A ROTSE3 finding chart can be found here,, and a light curve can be found at

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