TITLE:   GCN CIRCULAR
NUMBER:  23586
SUBJECT: GRB 181227A: Global MASTER Net  oprtical inspection
DATE:    18/12/29 09:02:21 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

E. Gorbovskoy, V. Lipunov, N.Tiurina,  V.Kornilov, 
P.Balanutsa, A.Kuznetsov, D. Vlasenko, D.Kobtsev
(Lomonosov Moscow State University, SAI),

R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix 
Aguilar),

H. Levato
(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio of San Juan 
National University, Argentina)

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

D. Buckley (South African Astronomical Observatory),

A. Tlatov, V.Senik,  D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),

O. Gress, N.M. Budnev, S. Yazev, O. Chuvalaev (Irkutsk State University, API)

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


MASTER-SAAO robotic telescope  (Global MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L)  located in South Africa (South African Astronomical 
Observatory) was pointed to the  FERMI and IPN  GRB181227A (E. Bissaldi et 
al. GCN  23569, Hurley et al  23577 44386 sec after trigger time at 
2018-12-27 18:36:46 UT, with upper limit up to  20.4 mag. Observations 
started at twilight, immediately after sunset.  The observations began at 
zenit distance = 25 deg. The sun  altitude  is -9.8 deg.

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was 
pointed to the  FERMI and IPN  GRB181227A  47842 sec after trigger time at 
2018-12-27 19:34:23 UT, with upper limit up to  18.0 mag. The observations 
began at zenit distance = 85 deg. The sun  altitude  is -17.0 deg.

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of 
San Juan National University) was pointed to the  FERMI and IPN 
GRB181227A 1 days 7760 sec after trigger time at 2018-12-28 08:26:20 UT, 
with upper limit up to  20.5 mag. Observations started at twilight.  The 
observations began at zenit distance = 83 deg. The sun  altitude  is -12.7 
deg.

The galactic latitude b = -60 deg., longitude l = 98 deg.


Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=894852

No OT found yet.

The message may be cited.

[GCN OPS NOTE(29dec18): Per author's request, the name of the GRB in the SUBJECT-line
was changed from "GRB 181228A" to "GRB 181227A".]