MASTER Detection of an Optical Transient in the Error Box of GRB 150128

ATel #7010; V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, V. Kornilov, N. Tiurina, A. Kuznetsov, V. Vladimirov (Lomonosov Moscow State University, SAI), K. Ivanov, O. Gres, S. Yazev, N. Budnev, V. Poleshchuk, E. Konstantinov (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk solar station of the Pulkovo observatory RAS) V. Yurkov, Y. Sergienko, 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), S. Shurpakov (MASTER team members)
on 30 Jan 2015; 20:21 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J180153.15+254323.5 - optical transient in the error box of GRB 150128

During the inspection of the error box of a long (more than 60 sec) multi-peak gamma-ray burst GRB 150128 (Fermi trigger 444164357, INTEGRAL SPI-ACS trigger 6874) MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 18h 01m 53.15s +25d 43m 23.5s on 2015-01-28.91546 UT (O. Gress et al., GCN 17365. The OT unfiltered magnitude is 16.6m (limit 18.6m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-06-28.73624 UT with unfiltered magnitude limit 19.8m. For the description of Global MASTER Robotic Net see Lipunov et al., 2010, Advances in Astronomy, article id. 349171, pp. 1-7.

MASTER-Tunka observations were made 3.0 hr after the Fermi-GBM trigger time (18:59:14 UT, or 2015-01-28.79113 UT). The OT position is 2.61 deg from the center of Fermi-GBM Final Position, within the 3.32 deg statistical error. This area of sky is not covered by SDSS. Nothing is visible at the OT position on the digitized Palomar plates to m_lim~21. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J180153+254323-BRIR5x5.jpg (2x zoom). The object is not present on the sum of unfiltered Palomar-NEAT images from 2001 Aug. 09 and Aug. 14 with a similar limit.

Follow up multiwavelength observations and spectroscopy are required. We note that the solar elongation of the OT is 59 deg. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/180153.15254323.5.png

Global MASTER Net