[vsnet-grb-info 20685] GRB 180614A: MASTER observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22783
SUBJECT: GRB 180614A: MASTER observation 
DATE:    18/06/15 11:28:04 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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

H.Levato, C. Saffe
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

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

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

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

MASTER-Kislovodsk  robotic telescope (MASTER-Net: http://observ.pereplet.ru  Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) ,
located in Kislovodsk Solar Station of Pulkovo observatory,
was pointed to the Swift GRB180614A (Gropp et al. GCN #22780)
11 sec after notice time and 26 sec after trigger time at 2018-06-14 19:16:40 UT.

On our images we  didn't find optical transient  up to 20 mag, within SWIFT error-box
RA,Dec=00h 12m 18.83s +46d 57' 10.8"  ( Evans et al. GCN22781, Beardmore et al. GCN22782).

We have a number of  images  with the following unfiltered upper limits:

Time_start,UT              Exp,s  m_lim

2018-06-14 19:16:40	10	16.6
2018-06-14 19:17:00	10	16.5
2018-06-14 19:17:20	10	16.7
2018-06-14 19:17:41	20	17.1
2018-06-14 19:18:11	20	17.2
2018-06-14 19:18:41	30	17.3
2018-06-14 19:19:21	40	17.6
2018-06-14 19:20:11	50	17.8
2018-06-14 19:21:12	60	18.0
2018-06-14 19:22:22	70	18.0
2018-06-14 19:25:23	110	18.4
2018-06-14 19:27:23	130	18.4
2018-06-14 19:33:27	180	18.3
2018-06-14 19:33:27    3600     20.0 [20 images x 180 seconds]
2018-06-14 19:36:52	180	18.3
2018-06-14 19:40:16	180	18.3
2018-06-14 19:43:41	180	18.3
2018-06-14 19:47:05	180	18.4
2018-06-14 19:50:29	180	18.6
2018-06-14 19:53:54	180	18.5
2018-06-14 19:57:18	180	18.6
2018-06-14 20:00:43	180	18.6
2018-06-14 20:04:07	180	18.6
2018-06-14 20:07:31	180	18.6
2018-06-14 20:10:55	180	18.6
2018-06-14 20:14:20	180	18.6
2018-06-14 20:17:45	180	18.6
2018-06-14 20:21:09	180	18.8
2018-06-14 20:24:34	180	18.6
2018-06-14 20:27:59	180	18.6
2018-06-14 20:31:23	180	18.9
2018-06-14 20:34:48	180	18.8
2018-06-14 20:38:12	180	18.8
====================================================================
The observations started on zenit distance = 78 degrees, galaxy latitude b = -15 degree.
The moon ( 2 % bright part) below the horizon (The altitude of the Moon is  -15 degree ).
The sun  altitude  is -18.8 degree.
The object could be observed up to sunrise at 2018-06-15 01:26:34