GCN Circular 16875
Subject
GRB 140930B: MASTER early possible OT detection
Date
2014-10-02T06:41:06Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina,
P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Denisenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A. Gabovich
Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
V.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)
Two MASTER II twin robotic telescope (MASTER-Net:
http://observ.pereplet.ru) located in Blagoveschensk and Kislovodsk was
pointed to the GRB140930B (Pasquale et. al GCN 16857) 21 and 36 sec after
notice time and 39 and 54 sec after trigger time respectively.
So we have 4 first images in four different polarization started after 21
sec (Blagoveschensk) and 36 sec (Kislovodsk) with 10 sec exposure.
We found 3-sigma OT on one tube image in Blagoveschensk at the
WHT position (Tanvir et. al, GCN16861, Fong et. al. GCN16863) with m =
16+-0.5 mag. The OT seen at one first image only.
The image with OT is available at
http://master.sai.msu.ru/static/GRB/GRB140930B_MASTER_OT.png
We do not see OT (Tanvir et. al GCN16857, Fong et. al. GCN16857) on three
tube images on single and coadd images.
The analysis strongly is complicated by presence of very bright star (USNO
B1 1142-0005722 ~14m) close to OT position.
The upper limits received by MASTER are given in the table below:
t_start | t-t_mid | exptime | filt | lim | site | coadd
--------------------------+---------+------+------+------+-------
19:42:21.909 | 44 sec | 10 | P/ | 16.4 | A | 1
19:42:21.909 | 44 sec | 10 | P\ | 15.7 | A | 1*
19:42:36.837 | 59 sec | 10 | P| | 15.6 | K | 1
19:42:36.837 | 59 sec | 10 | P- | 16.0 | K | 1
19:42:21.909 | 70 sec | 40 | P/ | 17.3 | A | 3
19:42:36.837 | 98 sec | 50 | P- | 16.9 | K | 3
19:42:21.909 | 130 sec | 130 | P/ | 18.5 | A | 6
19:44:26.834 | 243 sec | 120 | P- | 18.0 | K | 3
19:42:36.837 | 188 sec | 170 | P- | 18.6 | K | 6
19:42:36.837 | 692 sec | 1060 | P- | 19.9 | K | 13
19:42:21.909 | 698 sec | 1160 | P/ | 19.7 | A | 14
20:29:14.938 | 6120 sec | 5400 | C |~21.5 | K | 30
* possible OT
C is our white (clear) band which is well described by a parity 0.8R+0.2B (USNO B1).
P/ and P\ is a polarization filter which are oriented at an angle 45 and
135 degrees to RA axis respectivel. P- and P| is a polarization filter
which are oriented at an angle 0 and 90 degrees to RA axis respectivel.
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