GCN Circular 22797
Subject
GRB 180618A: MASTER OT observation (a short GRB with extended emission)
Date
2018-06-19T12:00:58Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
N.Tyurina, V. Lipunov, E. Gorbovskoy, V.Kornilov, A.Kuznetsov,
I. Gorbunov, D. Vlasenko, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
A. Tlatov, V.Senik, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
R. Podesta, F. Podesta, C. Lopez, C.Francile
Observatorio Astronomico Felix Aguilar (OAFA)
H.Levato, C. Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
D. Buckley
South African Astronomical Observatory
O. Gres, N.M.Budnev , Yu.Ishmuhametova
Irkutsk State University
A. Gabovich, V. Yurkov, Yu. Sergienko
Blagoveschensk Educational State University, Blagoveschensk
MASTER-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) ,
located in Kislovodsk Solar Station of Pulkovo observatory,
was pointed to the Swift GRB180618A (LaPorte et al. GCN #22790; Sakamoto
et al., GCN #22796)
25 sec after notice time and 41 sec after trigger time at 2018-06-18
00:43:53 UT.
On our first (10s exposure) polarization set we haven`t found optical
transient within SWIFT error-box (ra=169.933 dec=73.8478 r=0.05).
The 5-sigma upper limit has been about 15.2 mag
The observations made on zenit distance = 61 degrees, galaxy latitude b =
42 degree.
The moon (24 % bright part) below the horizon (The altitude of the Moon is
-31 degree ).
Observations started at twilight and bad transparency. The sun altitude
is -6.8 degree.
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in IAC was pointed to the GRB180618A 1734 sec after trigger time
at 2018-06-18 01:12:07 UT.
On our first (180s exposure) set we found ~19 mag optical transient
within SWIFT UVOT error-box (LaPorte et al. GCN #22790; Guidorzi et al.,
GCN #22792;).
The 5-sigma upper limit has been about 19.0 mag on single (180 s) and
20.5 on coadd (1800 s) exposures.
====================================================================
The observations made on zenit distance = 64 degrees, galaxy latitude b =
42 degree.
The moon (24 % bright part) below the horizon (The altitude of the Moon is
-15 degree ).
The sun altitude is -38.3 degree.
The object can be observed till sunrise at 2018-06-18 06:08:21
The message may be cited.