Flare of AGN candidate WISE J203431.37+641040.8 detected by MASTER

ATel #6470; D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 15 Sep 2014; 13:05 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J203431.51+641040.8 - flare of AGN candidate

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 20h 34m 31.51s +64d 10m 40.8s on 2014-09-14.02613 UT. The OT unfiltered magnitude is 16.6m (limit 18.9m). The OT is seen in 10 images. There is no minor planet at this place. We have reference image without OT on 2010-09-21.81319 UT with unfiltered magnitude limit 19.1m.

The object is showing significant variability on the digitized Palomar plates with the following entries in catalogs: USNO-B1.0 1541-0239933 (20 34 31.37 +64 10 41.0 B2=20.54 I=18.03), Fmag=18.20 jmag=20.20 Vmag=17.13 Nmag=18.01 (GSC 2.3.2). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J203431+641040-BRIR.jpg (10'x10' FOV). There is also an infrared detection 2MASS J20343136+6410407 (J=13.73 H=12.02 K=10.91) and WISE J203431.37+641040.8 (W1=10.35 W2=9.52 W3=6.95 W4=4.80). Despite the large infrared excess, the object is not particularly red in the optical band. The colors are very similar to those of MASTER OT J013135.43+555831.5 = WISE J013135.51+555832.0 (ATel #6432).

The object is present in AGN candidates from the WISE, 2MASS, RASS (R. Edelson, M. Malkan, ApJ 751, 52, 2012). This area of sky in Cepheus is not covered by SDSS and CRTS. No UV or radio source was detected at this position. There is a faint ROSAT X-ray source 1RXS J203435.8+641204 (error radius=21", flux=0.0080+/-0.0033 cnts/s, hardness ratios HR1=1.00+/-0.55, HR2=0.26+/-0.44) formally 88" away. We note that the new variable object is located about 1.5' west of the center of the dark molecular cloud G99.10+13.98 (size ~3'x1').

Optical spectroscopy and multiwavelength follow up observations are required to determine the nature of this peculiar object. MASTER detection and reference images are available at: http://master.sai.msu.ru/static/OT/203431.51641040.8.png

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