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GCN Circular 20075

Subject
GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
Date
2016-10-18T16:23:33Z (8 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V.A.Sadovnichy,
Lomonosov Moscow State University

M.I.Panasyuk,  S.I.Svertilov, A.V.Bogomolov, 
V.V.Bogomolov, N.L.Dzhioeva, A.M.Amelushkin, V.O.Barinova, A.F.Iyudin, 
V.V.Kalegaev, D.Nguen,  V.L. Petrov, I.V.Yashin, P.S.Kazarian
Physics Department, Skobel`tsyn Institute of Nuclear Physics, Moscow State

V. Lipunov, E.S. Gorbovskoy, N.Tyurina, D.Kuvshinov, M.Panchenko, 
A.Kuznetsov, V.G.Kornilov, P. Balanutsa, E.Popova 
Lomonosov Moscow State University, Sternberg Astronomical Institute

V.Yurkov, A.Gabovich, Yu.Sergienko 
Blagoveschensk Educational State University, Blagoveschensk

N.M.Budnev, K.Ivanov, O.Gres, O.Chuvalaev, V.A.Poleshchuk, S.Yazev
Irkutsk State University

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

I. Park, J. Lee, S. Jeong
Department of Physics, Sungkyunkwan University, Seobu-ro, Jangangu, Suwonsi, 
Korea

At 17:52:17 UT on 17 Sep 2016, the Lomonosov BDRG  Gamma-ray Burst
Monitor  (http://lomonosov.sinp.msu.ru/en/scientific-equipment-2/bdrg )
triggered GRB 161017A (E. Troja et al.,, GCN 20064).
GRB 161017A has several peaks LC, total duration ~100s,the energy range
70-300 keV.

The light curve is available at
http://master.sai.msu.ru/static/Lomonosov/GRB161017A_BDRG2.png

More information will be available at:
http://lomonosov.sinp.msu.ru/category/results/observation-gamma-ray-bursts

MASTER-Amur  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Blagoveschensk was pointed to the  GRB161017A 21 sec after 
notice time and 47 sec after Swift trigger time at 2016-10-17 17:52:38 UT 
in two polarizations. 
On  our first (10s exposure)  set we  marginally found  optical transient 
at  Yurkov et al. (GCN 20063) and Troja et al. (GCN 20064) position.
The 5-sigma upper limit has been about 14.5 mag .
The OT was became brighter up to maximum at 3-4  set .

The observations made on zenit distance = 53 degrees, galaxy latitude b = 
47 degree.
The moon (96 % bright part) is 50 degrees above the horizon. The distance 
between  moon and  object is 87
The sun  altitude  is -37.8 degree.


MASTER-Tunka  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Tunka (Baykal lake) was pointed to the  GRB161017.74 75 sec 
after notice time 
and 103 sec after trigger time at 2016-10-17 17:53:34 UT. On our second 
(20s exposure)  set we haven`t found optical transient  within SWIFT 
error-box (ra=09 31 03 dec=+43 08 31 r=0.050000).
The 5-sigma upper limit has been about 12.5 mag.

The observations made on zenit distance = 65 degrees, galaxy latitude b = 
47 degree.
The moon (96 % bright part) is 50 degrees above the horizon. The distance 
between  moon and  object is 87 degrees.
The sun  altitude  is -45.9 degrees.
The low mahnitude limit because dense fog due to Irkut (Famost Sibirian 
river) evaporation.

We imaged OT late.

MASTER-IAC  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located at Teide Observatory (Tenerife, Canary, Spain) was pointed to the 
GRB161017A  32942 sec after trigger time at 2016-10-18 03:00:53 UT. On our 
first (180s exposure)  set we found optical transient  on coaded images.
The 5-sigma upper limit has been about 17.8 mag

The observations made on zenit distance = 69 degrees, galaxy latitude b = 
47 degrees. The moon (94 % bright part) is 75 degrees above the horizon. 
The distance  between  moon and  object is 82 degrees.
The sun  altitude  is -54.1 degree.

Our preliminary photometry is next:

Time     Tstart  Tmid Expt    Site      Filter  Mag   eMag Filter  Mag   eMag

17:52:38    47    52   10   MASTER-Amur   P/   15.69   1.0  P\   15.46   1.0
17:53:07    71    76   10   MASTER-Amur   P/   14.05   0.3  P\   13.99   0.3
17:53:03    96   106   20   MASTER-Amur   P/   13.87   0.2  P\   13.63   0.2
17:54:03   131   146   30   MASTER-Amur   P/   13.90   0.3  P\   13.80   0.3
17:54:46   175   195   40   MASTER-Amur   P/   14.34   0.3  P\   14.34   0.3
17:55:41   229   254   50   MASTER-Amur   P/   15.03   0.4  P\
17:56:46   295   325   60   MASTER-Amur   P/   14.91   0.4  P\   14.91   0.4
17:58:12   381   540  240   MASTER-Amur   P/   15.88   0.4  P\   16.03   0.4
18:05:20   809   889  160   MASTER-Tunka  P|   15.64   0.2
03:00:53 32942 33464  900   MASTER-IAC    C    18.62   0.2
03:19:17 34046 34587  900   MASTER-IAC    C    18.60   0.2
03:38:01 35170 35726  900   MASTER-IAC    C    18.62   0.2
03:57:26 36335 36885  900   MASTER-IAC    C    18.68   0.2

Preliminary OT light curve is available at
http://master.sai.msu.ru/static/GRB161017A.png


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