MASTER OT J015539.85+485955.6 was detected during Fermi alert inspection 3.5h after the trigger time

ATel #8270; R. Rebolo (IAC), V. Lipunov, E. Gorbovskoy (Lomonosov MSU), M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), V. Shumkov, N. Tyurina, V. Kornilov, P. Balanutsa, A. Kuznetsov, D. Vlasenko, I. Gorbunov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), D. Buckley, S. Potter, A. Kniazev, M. Kotze (South African Astronomical Observatory), A. Tlatov, A. V. Parhomenko, D. Dormidontov, V. Senik (Kislovodsk Solar Station of the Pulkovo Observatory), O. Gress, K. Ivanov, N. M.Budnev(Irkutsk State University), V. Yurkov, Yu. Sergienko, A. Gabovich, E. Sinyakov (Blagoveschensk Educational State University), V. Krushinski, I. Zalozhnih (Ural Federal University), S. Shurpakov
on 10 Nov 2015; 22:44 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER-IAC, MASTER-Kislovodsk and MASTER-SAAO was pointed to the FERMI GBM GRB151107B (Stanbro, Meegan, GCN #18570 ) at 2015-11-07 20:25:52(/59s/58s) UT (R.Rebolo et al., GCN #18576 ).

There were the prompt pointing observations because duration of the GRB was ~140s .

After 5 minutes of the alert observations of the error-box center, MASTER telescopes in IAC and Kislovodsk started the inspect survey inside large Fermi error box (ra=00 42 28 dec=+48 48 58 r=4.533300) obtained by GCN socket.

As a result, we cover more than 98% of 1 sigma+systematic and 85% of 3-sigma + systematic of the FERMI GBM final error box (Stanbro et. al. GCN 18570) with upper limit up to 19 mag during this night.

The coverage map is available at http://master.sai.msu.ru/static/GRB/GRB151107B.png

MASTER OT J015539.85+485955.6 was the only transient, detected by MASTER automatically software in this field (Shumkov et al., ATEL #8262) at the position(RA, Dec) = 01h 55m 39.85s +48d 59m 55.6s (m_OT=15.2, 2015-11-07.99775 UT), that is in 9.4"E,7.9"N from PGC212862(17.5m) and in 0.5" from USNO B1 star(GSC B=20.5m).

This OT was observed by Liverpool Telescope at La Palma (SPRAT spectrograph, Piascik and Steele, ATel #8265 ). There was a broad continuum, consistent with that expected from a dwarf nova in outburst.

This OT was independently detected by ASAS (ASASSN-15sr, Holoin et al., ATEL #8260) and our today imaging (Kislovodsk, 2015-11-10 17:16:26.513UT, m_OT=15.5+-0.1) shows that OT doesn't fade essentially with respect to discovery magnitude contraverse to GRB optical afterglow .

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