[vsnet-grb-info 21159] GRB 180923A: MASTER inspection MAXI/GSC error box

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23258
SUBJECT: GRB 180923A: MASTER inspection MAXI/GSC error box
DATE:    18/09/23 08:38:06 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, D. Vlasenko, N.Tiurina,
V.Kornilov, A.Kuznetsov, V.Chazov, I.  Gorbunov,
D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov,
Lomonosov Moscow State University,SAI

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

D. Buckley,
South African Astronomical Observatory (SAAO)

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

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

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

O. Gres, N.M.Budnev , Yu.Ishmuhametova
Irkutsk State University (ISU)

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

MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Argentina (OAFA observatory of San Juan National University) was starting 
survey on the MAXI  GRB180923.17 error-box (ra=02 33 12 dec=+06 18 02 r=1) 
2777 sec after notice time and 7954 sec after trigger time at 2018-09-23 
06:21:04 UT. The 5-sigma upper limit on our first (60s exposure)  set is 
about 17.9 mag

No OT detected.

The galacitc latitude b =  0 deg.

The observations made on zenit distance = 39 deg.The moon (97 % bright
part) is 42 deg. above the horizon. The distance between  moon and  object
is 59
The sun  altitude  is -48.6 deg.
The object can be observed till sunrise at 2018-09-23 10:25:33
  .


The cover map is availavle at 
http://observ.pereplet.ru/images/GRB180923A_cover_map.png

Only for MASTER-team:

The OT candidate available here 
https://200.123.254.238:49004//master2/trans.php?wh=transients.coord2000@%27%3C%2838.3d%2C6.30056d%29%2C2d%3E%27%3A%3Ascircle+and+transients.datetime%3E%3D%272018-09-23+04%3A08%3A30%27&class=9&t2=MAXI+GRB180923.17+optical+counterpart+candidate

The full information about this GRB180923.17 available here 
https://200.123.254.238:49004//master2/grb.php?not=2018-09-23+05%3A34%3A46.484065&sat=MAXI&gcrd=%2838.3d%2C6.30056d%29&eb=1&trig=2018-09-23+04%3A08%3A30&n=GRB180923.17


The message may be cited.