[vsnet-grb-info 20776] GRB 180626C / Fermi trigger 551697835: MASTER inspection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22874
SUBJECT: GRB 180626C / Fermi trigger 551697835: MASTER inspection
DATE:    18/06/30 16:18:31 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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

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)

D. Buckley
South African Astronomical Observatory

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

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



MASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) ,
located in Teyde Observatory (IAC, Spain),
was pointed to the IPN (Svinkin et al. GCN22864, Kozlova et al. GCN22868) Triangulation GRB180626C / Fermi trigger 551697835 
(GRB_Time  18/06/26 09:23:50.65UT; RA,Dec(2000)=19h 00m 14s +44d 49' 12" (GRB_ERROR: 8.21 deg radius, statistical only  , see 
https://gcn.gsfc.nasa.gov/other/551697835.fermi) also inspected by ZTF (Coughlin et al. GCN22871)
  at 2018-06-26 21:37:30UT-22:53:48 with unfiltered  mlim=19.1 (180s expositions);
2018-06-27 03:34:57-03:53:20 with mlim=19.7 on summary expositions (5sigma, exp=540s).
The observations started on zenit distance = 41 degrees.  The sun  altitude  was -17.66 degree.

MASTER-SAAO  robotic telescope located in South Africa started Fermi 
inspection  5834 sec after notice time and 37433 sec after trigger time at  2018-06-26 19:51:28 UT.
The 5-sigma upper limit on our second (180s exposure)  set is about 16.2mag.
The observations started on zenit distance = 89 degrees, galaxy latitude b = 22 degree.
The moon (98 % bright part) is 64 degrees above the horizon. The distance 
between  moon and  object is 69. The sun  altitude  was -52.2 degree.


MASTER-Amur robotic telescope, located at BSPU, was pointed to Fermi 
trigger 551697835 on 2018-06-27 14:09:39UT, and observed till  14:57:32.584UT with mlim=18.0(180s exp)

MASTER-Kislovodsk robotic telescope, located at Kislovodsk Solar Station 
of Pulkovo observatory, started Fermi trigger inspection at 2018-06-27 20:53:26 UT.
The 5-sigma upper limit on our first (180s exposure)  set is about 18.8mag .
The observations started on zenit distance =  6 degrees, galaxy latitude b = 22 degree.
The moon (100 % bright part) is 26 degrees above the horizon. The distance 
between  moon and  object is 68 .The sun  altitude  is -22.8 degree.

New OT, that could be connected with GRB, wasn't found.