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Unusual Flaring Object in Taurus detected by MASTER

ATel #6918; P. Balanutsa, V. Lipunov, D. Denisenko, E. Gorbovskoy, N. Tiurina, A. Kuznetsov, M. Pruzhinskaya, A. Rufanov, V. Vladimirov, V. G.Kornilov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, ; O. Gress, V. Poleshchuk, E. Konstantinov (Irkutsk State University) A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS) V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), D. Buckley, S. Potter, A. Kniazev, M. Kotze (SAAO), V. Shumkov, S. Shurpakov, V. Shumkov, (MASTER team members)
on 14 Jan 2015; 18:12 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Star, Transient, Variables, Young Stellar Object

MASTER OT J051515.25+223945.7 - flaring red object

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 05h 15m 15.25s +22d 39m 45.7s on 2015-01-13.83465 UT. The OT unfiltered magnitude is 18.5m (limit 19.6m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2010-11-08.93832 UT with unfiltered magnitude limit 19.8m. The object has faded from 18.5m to 19.6m in 1.2 hours between two triplets of images obtained at 19:58:27 UT and 21:11:30 UT.

There are several archive images at 2012-09-25 01:46:53.7 with OT (~19.5 mag).

The OT is within 0.7" of the infrared source UGCS J051515.24+223944.9 in UKIDSS-DR9 Galactic Clusters Survey with J=19.1 and K=17.9. Galactic latitude is -9 deg, galactic extinction is A_J=0.33, A_K=0.14 (E. Schlafly et al., 2011). There is nothing at this position in 1RXS, GALEX, USNO, GSC, 2MASS, radio catalogs and AAVSO VSX. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J051515+223945-BRIR5x5.jpg (2x zoom). This area of sky in Taurus is not covered by SDSS.

The object is showing unusual variability in Mount Lemmon Survey data, see the light curve of MLS J051515.5+223944.

There is a low significant period 0.20705d in MLS data.

The nature of the object is uncertain. Follow up multi-wavelength observations and spectroscopy are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTERJ051515.25+223945.jpg

List of Optical Transients discovered by MASTER

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