Large-Amplitude Bright Optical Transient in Taurus detected by MASTER
ATel #5369; D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, V. Vladimirov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova (Irkutsk State University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 5 Sep 2013; 21:20 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)
Subjects: Optical, Cataclysmic Variable, Nova, Transient
Referred to by ATel #: 5381
MASTER OT J040552.59+274716.7 - large amplitude optical transient (CV or classical Nova)
MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 04h 05m 52.59s +27d 47m 16.7s on 2013-09-05.73515 UT. The OT unfiltered magnitude is 14.6m (limit 18.1m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2013-01-09.53743 UT with unfiltered magnitude limit 18.6m. The object has brightened to 14.5m on the second triplet of images obtained 45 minutes later, on 2013-09-05.767 UT.
There is nothing at this position on the digitized Palomar plates and on their combination down to ~22m. Color-combined finder chart is uploaded to http://master.sai.msu.ru/static/OT/J040552+274716-BRIR.jpg (10'x10' FOV). The object is not present in 1RXS, USNO-B, GSC, 2MASS, GCVS and AAVSO VSX. This area of sky in Taurus is not covered by GALEX and SDSS. No previous outbursts were detected by CRTS and Palomar/NEAT. Sum of 10 best NEAT images is uploaded to http://master.sai.msu.ru/static/OT/J040552+274716-NEAT.jpg (5'x5' FOV).
Based on the outburst amplitude (at least 7.5m) MASTER OT J040552.59+274716.7 is likely a dwarf nova of UGWZ (WZ Sge) type. However, taking into account the object's location in Taurus, other scenarios (including a classical Nova eruption) are also possible. Spectral and photometric observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/040552.59274716.7.png
List of Optical Transients discovered by MASTER
Global MASTER Robotic Net
