[vsnet-grb-info 20928] GRB 180722A: MASTER second inspection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23026
SUBJECT: GRB 180722A: MASTER second inspection
DATE:    18/07/24 10:16:15 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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)

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,
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-SAAO  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in SAAO was starting second survey on the MAXI  GRB180722A 
error-box 
(ra=20 11 34 dec=+24 13 15 r=1)  61549 sec after notice time and 65839 sec 
after trigger time at 2018-07-23 00:16:35 UT (Shimomukai et al., 
MAXI/GSC detection, GCN #23005; Lipunov et al., GCN #23006). The 5-sigma 
upper limit on our first (180s exposure)  set is about 19.0  mag

This error-box was observed by MASTER-Amur ( 2018-07-23 
12:53:17-14:00:20UT, 60s, mlim=17.8) and another MASTER sites.

The coverage  map of the 3 sigms error box is available at
http://master.sai.msu.ru/static/OT/MASTERMAXIGRB180722A.jpg

The observations made on zenit distance = 61 degrees, galaxy latitude b = 
-6 degree.
The moon (80 % bright part) is 17 degrees above the horizon. The distance 
between  moon and  object is 69
The sun  altitude  is -65.7 degree.
The object can be observed till 2018-07-23 03:41:44




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