MASTER OT Discovery during Fermi GRB Error Box Inspection

ATel #6792; V. Vladimirov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, E. Popova (Lomonosov Moscow State University, SAI), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov (MASTER team members)
on 8 Dec 2014; 20:41 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J001907.27+403423.8 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 00h 19m 07.27s +40d 34m 23.8s on 2014-12-08.63441 UT. The OT unfiltered magnitude is 17.4m (limit 19.4m). The OT is seen in 9 images. There is no minor planet at this place. We have reference image without OT on 2011-12-13.67580 UT with unfiltered magnitude limit 19.9m. There was a previous outburst in MASTER-Kislovodsk data on 2011-08-20.984-21.040 UT to 16.9m not detected as a transient then.

The OT position is within 1" of the star APM EO1243-0352761 (bmag=22.06). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J001907+403423-BRIR5x5.jpg (2x zoom). There is a possible UV counterpart GALEX J001907.4+403424 (NUV=22.51+/-0.41). Nothing is present at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Andromeda is not covered by SDSS. Catalina Sky Survey has two past detections in Orphan Catalogue to 16.9m on 2012 Nov. 15 and 18.4m on 2013 Sep. 16. NEAT project has 10 images on 3 different nights from 1998 Aug. 18 to 2002 Oct. 13 with no additional outbursts.

Based on the amplitude of variability and previous outbursts, MASTER OT J001907.27+403423.8 is a new cataclysmic variable (dwarf nova) in Our Galaxy. The offset from M31 galaxy center (4.48 degree West, 0.70 degree South) is too large for it to be related to M31. The location in Fermi GRB error box is likely a chance coincidence. The object brightness has not changed significantly on the images obtained 4.5-5 hours after the discovery, on Dec. 08.818-08.841 UT (unfiltered magnitude 17.6-17.7). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/001907.27403423.8.png

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