GCN Circular 21391
Subject
GRB 170728B: MASTER-IAC first minute short GRB early OT detection
Date
2017-07-30T13:25:56Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, D.Kuvshinov, A.V.Krylov,
I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA),
National University of San Juan, Argentina
H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,
V.A.Poleshchuk,
Irkutsk State University
V.Yurkov, Yu.Sergienko
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in IAC was pointed to the GRB170728B (Cenko et al., GCN Circ.
#21371) 28 sec after notice time
and 39 sec after trigger time at 2017-07-28 23:04:01 UT. On our first (10s
exposure) set we found optical transient within SWIFT XRT error-box (
D'Elia et al., GCN #21376; ) in two polarizations!
The 5-sigma upper limit has been about 16.9 mag
We 100% found faiding OT on first 10 minutes images with m ~ 16.5 up
to 18 mag.
RA, DEC = 15h 51m 55s.5 , +70d 7m 19s.3
Error = +- 1.4 arcsec
The faiding OT may be coincide with D'Avanzo et al. position (GCN
#21372) and Heintz et al., (GCN #21374) and Izzo et al., (GCN #21381) and
The observations made on zenit distance = 47 degrees, galaxy latitude b =
40 degree.
The moon (34 % bright part) is 8 degrees above the horizon. The distance
between moon and object is 78
The sun altitude is -33.7 degree.
The error box can be observed till sunrise at 2017-07-29 06:25:17.
The message may be cited.