[vsnet-grb-info 21459] GRB 181222B: Global MASTER Net observations of short bright Fermi GRB

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23558
SUBJECT: GRB 181222B: Global MASTER Net observations of short bright Fermi GRB
DATE:    18/12/25 11:34:42 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, 
Irkutsk State University

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

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

H. Levato
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

The Global MASTER network continues to inspect error box of the short 
bright gamma-ray burst GRB 181222B (Veres, GCN #23551; Lipunov et al., 
GCN #23552)

MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) located in Spain (IAC Teide Observatory)
started inspect survey of  Fermi GRB18122B   IPN 
error-box (Svinkin et al., GCN #23556)
36801 sec after notice time and 36801 sec after trigger time
at 2018-12-24 19:07:42 UT.
  There are 479 galaxies in IPN localization.

MASTER auto-detection system found optical transient:

MASTER OT J204928.79+245744.0 detection.

MASTER-IAC auto-detection system discovered OT source at
(RA, Dec)=20h 49m 28.79s +24d 57m 44.0s on 2018-12-24.81773 UT.
The OT unfiltered magnitude is 16.9m (limit 18.6m).

The OT is seen in 2 images. There is no minor planet at this place.
We have reference image without OT on 2018-08-02.04970 UT with 18.7m unfiltered magnitude limit .
There is red start in PanSTARR (rmag=21.7) and SDSS.9 (r=21.9)
Spectral observations are required.


Observations started at twilight.The sun  altitude was -11.5 deg.
The observations made on zenit distance = 29 deg.
The moon (94 % bright part) below the horizon
The altitude of the Moon is -14 deg. 
The object can be observed till 2018-12-25 00:54:38.
The galactic latitude b = -60 deg., longitude l = 98 deg.

MASTER-Amur robotic telescope  located in Russia (Blagoveshchensk State 
Pedagogical University) was pointed to the  FERMI GRB181222B 46503 sec 
after trigger time at 2018-12-23 09:06:40 UT, with upper limit up to  17.8 
mag. Observations started at twilight.  The observations began at zenit 
distance = 44 deg. The sun  altitude  is -14.2 deg.

MASTER-Tunka robotic telescope  located in Russia (Applied Physics 
Institute, Irkutsk State University) was pointed to the  FERMI 
GRB181222B 52255 sec after trigger time at 2018-12-23 10:42:32 UT, with 
upper limit up to  18.6 mag. Observations started at twilight.  The 
observations began at zenit distance = 44 deg. The sun  altitude  is -14.5 
deg.


The cover map is available at 
https://master.sai.msu.ru/site/master2/observ.php?id=890715


The message may be cited.