ASAS-SN Discovery of a Bright Transient Source near CGCG477-027

ATel #6211; A. B. Davis, B. J. Shappee, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. Brimacombe (Coral Towers Observatory), D. Bersier (LJMU)
on 9 Jun 2014; 03:01 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Benjamin Shappee (shappee@astronomy.ohio-state.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source.

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14ca  23:53:13.23   +27:42:01.64      2014-06-7.60       15.5       

ASASSN-14ca was discovered in images obtained on 2014 UT June 7.60 at V~15.5 mag. We also detect the object in images obtained on June 3.59, June 5.59, June 8.56, and June 8.61. We do not detect this object in images taken on 2014 UT June 2.57 and before. This figure shows the ASAS-SN reference image (top left), archival SDSS g-band image (top right), the ASAS-SN June 3.59 image (bottom left), and the ASAS-SN June 8.61 image (bottom right). The green circle has a radius of 5" at the position of the transient derived from the ASAS-SN image.

A cross-check of the ASAS-SN position in Vizier reveals that the nearest source is a faint (g~20.58) and red (g-r=0.66) star roughly 0.24" away from our position of the transient. The line-of-sight Galactic extinction at this position is A_V=0.118 (Schlafly & Finkbeiner 2011), so nearby sources are not likely to be significantly reddened. There are CRTS data at the position of the object which show a previous outburst on 2005 UT July 5.37 of similar magnitude and duration of least 6 days (data do not well constrain the beginning nor the end of the flare).

ASASSN-14ca appears to be a long-lived (> 5 days) transient associated with a red source. Follow up observations, especially spectroscopic, are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.