[vsnet-alert 10338] ROTSE3 J004626+410714: new DN candidate in outburst

[Taichi Kato]

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 (yuanfang at umich.edu) 

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, 
http://rotse.net/rsvp/ROTSE3%20J004626+410714.jpg, and a light curve 
can be found at http://rotse.net/rsvp/cv0046+4107.jpg.