GCN Circular 23310

E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, 
N.Tyurina, P.Balanutsa,A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institute

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

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

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

O. Gres, N.M. Budnev, Yu.Ishmuhametova
Applied Physics Institute of Irkutsk State University

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

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 pointed 
to the  GRB181010.25 19 sec after notice time and 42 sec after trigger 
time at 2018-10-10 05:56:33 UT. On our first (60s coadd exposure) coadd 
set we  found 1 optical transient within SWIFT error-box (ra=52.55 
dec=-23.0344 r=0.05) brighter than 18.24.


  T-Tmid      Date      Time       Expt.        Ra                Dec 
Mag
---------|---------------------|-------|-----------------|-----------------|-------
       72   2018-10-10 05:56:33      60   (  3h 30m 16.8s , -23d  2m 14.9s) 
18.05

The 5-sigma upper limit has been about 18.7 mag
The message may be cited.


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The galactic latitude b = -53 deg., longitude l = 215 deg.
The observations made on zenit distance = 15 deg.The moon ( 2 % bright 
part) below the horizon (The altitude of the Moon is -50 deg. ).
The sun  altitude  is -45.7 deg.
The object can be observed till sunrise at 2018-10-10 10:03:45
  .



THIS BLOCK FOR MASTER-Team USERS ONLY.

Link to GRB181010.25 page: 
https://200.123.254.238:49004//master2/grb.php?not=2018-10-10+05%3A56%3A14&sat=SWIFT&gcrd=%2852.55d%2C-23.0344d%29&eb=0.05&trig=2018-10-10+05%3A55%3A51&n=GRB181010.25
Long     transients in E.B. 
https://200.123.254.238:49004//master2/trans.php?wh=transients.coord2000@%27%3C%2852.55d%2C-23.0344d%29%2C0.1d%3E%27%3A%3Ascircle+and+transients.datetime%3E%3D%272018-10-10+05%3A55%3A51%27&class=9&t2=SWIFT+GRB181010.25+optical+counterpart+candidate
Short    transients in E.B. 
https://200.123.254.238:49004//master2/trans3.php?wh=transients3.coord2000@%27%3C%2852.55d%2C-23.0344d%29%2C0.1d%3E%27%3A%3Ascircle+and+transients3.datetime%3E%3D%272018-10-10+05%3A55%3A51%27&class=-1&t2=SWIFT+GRB181010.25+optical+counterpart+candidate
Two tube transients in E.B. 
https://200.123.254.238:49004//master2/trans2.php?wh=transients2.coord2000@%27%3C%2852.55d%2C-23.0344d%29%2C0.1d%3E%27%3A%3Ascircle+and+transients2.datetime%3E%3D%272018-10-10+05%3A55%3A51%27&class=0&t2=SWIFT+GRB181010.25+optical+counterpart+candidate
Undef. objects 1 image 
https://200.123.254.238:49004//master2/aobj.php?wh=stars.coord2000@%27%3C%2852.55d%2C-23.0344d%29%2C0.1d%3E%27%3A%3Ascircle+and+stars.class=0+and+stars.status+and+stars.proc_id=626837&t2=SWIFT+GRB181010.25+1+image+optical+counterpart+candidate


The observation and reduction will continue.
This circular was generated automatically.
The message may be cited.