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Bright Optical Flare of the AGN candidate detected by MASTER

ATel #6432; 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 30 Aug 2014; 17:35 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Infra-Red, Optical, AGN, Transient, Young Stellar Object

Referred to by ATel #: 6470, 6642, 6665

MASTER OT J013135.43+555831.5 - flare of AGN candidate WISE J013135.51+555832.0

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 01h 31m 35.43s +55d 58m 31.5s on 2014-08-24.72139 UT. The OT unfiltered magnitude is 16.7m (limit 18.6m). The OT is seen in 36 images. There is no minor planet at this place. We have reference image without OT on 2013-11-05.72388 UT with unfiltered magnitude limit 18.6m.

The object is showing a significant variability on the digitized Palomar plates being not visible on 1954-01-03 POSS-I red and blue plates. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J0131+5558-BRIR.jpg (10'x10' FOV). It has the following entries in catalogs: USNO-B1.0 1459-0052612 (01 31 35.52 +55 58 32.4 R2=18.06 I=16.88), jmag=21.72 (GSC 2.3.2). There is also an infrared detection 2MASS J01313552+5558321 (J=14.95 H=13.61 K=12.40) and WISE J013135.51+555832.0 (W1=10.66 W2=9.58 W3=7.02 W4=4.84).

The object is present simultaneously in AGN candidates from the WISE, 2MASS and ROSAT all-sky surveys (R. Edelson, M. Malkan, ApJ 751, 52, 2012) and in AKARI Far-Infrared Surveyor YSO catalog (L. V. Toth et al., PASJ 66, 17, 2014). This area of sky in Cassiopeia is not covered by SDSS and CRTS. There is no X-ray, UV or radio source at this position.

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/013135.43555831.5.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net