GCN Circular 17780
Subject
GRB 150428B: MASTER-net prompt optical observation
Date
2015-04-28T15:33:45Z (10 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
E. Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov,
D.Kuvshinov,
Lomonosov Moscow State University, Sternberg Astronomical Institute
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk 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
Blagoveschensk Educational State University, Blagoveschensk
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)
MASTER II robotic telescope (MASTER-SAAO: http://observ.pereplet.ru)
located in SAAO was pointed to the GRB150428B 24 sec after notice time
and 59 sec after trigger time at 2015-04-28 03:13:03 UT in two
polarizations. On our first (10s exposure) set we haven`t found optical
transient within SWIFT BAT (Page et. al GCN 17766) and XRT (Beardmore et
al. GCN 17773) error-boxes .
We have 3x2 images during Gamma Ray activity (see Page et al., GCN 17777)
in two polarizations.
So our observations is prompt observations.
We obtain a followin upper limits on single and coadd images:
Date start T_start -T_trig T_mid-T_trig Expt. Limit Coadd
03:13:03.3 59 64 10 16.5 no
03:13:03.3 59 97 50 17.4 3
03:13:03.3 59 529 810 19.3 12
Data analysis was hampered by a high density of stars in the error box.
XRT position covered by bright (~15m) star USNO B1 0941-0468603.
The message may be cited.