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GCN Circular 21199

Subject
Swift Trigger 755873: MASTER Net optical observations
Date
2017-06-05T10:40:54Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
O. Ershova
Irkutsk State University

V. Lipunov, V.Kornilov, N.Tyurina, E.Gorbovskoy, D.Kuvshinov, A.V.Krylov,
I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU

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

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

D.Buckley
South African Astronomical Observatory

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

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

R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA),
National University of San Juan, Argentina

H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina

MASTER Kislovodsk was observed Swift Trigger 755873 since 62 sec to 2957 
sec after  trigger time in SWIFT error box (K.L. Page et al., GCN # 
21193). MASTER -IAC and MASTER-Kislovodsk had credible conditions
for observations.

MASTER-Kislovodsk was pointed to the 
Swift Trigger 755873 12 sec after notice time and 62 sec after trigger 
time at 
2017-06-04 21:31:54 UT. On our first (10s exposure)  set we haven`t found 
optical transient  within SWIFT error-box.

The 5-sigma upper limit has been about 16.9mag . This limit in agreement 
with Jelinek et al. (GCN  #21194)

The observations made on zenit distance = 38 degrees, galaxy latitude b = 
53 degree.
The moon (81 % bright part) is 20 degrees above the horizon. The distance 
between  moon and  object is 69. The sun  altitude  is -23.5 degree.
The object can be observed till sunrise at 2017-06-05 01:28:56 .

MASTER-IAC  robotic telescope located in IAC was pointed to the Swift 
Trigger 755873 1001 sec after notice time and 1051 sec after trigger
time at 2017-06-04 22:05:58 UT.

The 5-sigma upper limit has been about 20.2 mag

The observations made on zenit distance = 36 degrees, galaxy latitude b = 
53 degree.
The moon (82 % bright part) is 56 degrees above the horizon. The distance 
between  moon and  object is 69
The sun  altitude  is -23.6 degree.
The object can be observed till sunrise at 2017-06-05 06:07:42.

All our observations are in agreement with Ondrejov Robotic Telescope 
Limit  (Jelinek et al. GCN  #21194 ).

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