TITLE:   GCN CIRCULAR
NUMBER:  22904
SUBJECT: GRB 180705A: MASTER optical observation
DATE:    18/07/05 18:08:43 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@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

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 Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) ,
located in South African Astronomical Observatory,
was pointed to the Swift GRB180705A (BAT: Stamatikos et al. GCN 22902, GRBtime: 2018-07-05 15:41:14UT; XRT : RA,Dec2000=14h 10m 27.18s -11d 38' 54.3"  Kennea et al. GCN22903)
at 2018-07-05 15:54:52  ( GRB  Altitude: 55.90, Sun: Altitude: -3.10) at sunset.

So MASTER-SAAO started GRB180705A observations at 2018-07-05 16:35:54UT (GRB altitute: 62.78, Sun: Altitude: -11.10).

MASTER automatic unfiltered (W=0.2B+0.8R by USNO-B1) limits are the following

T_start,UT             Exp,s    mlim   MASTER-II
2018-07-05 16:35:54	540	18.8	WEST
2018-07-05 16:35:54	180	17.9	WEST
2018-07-05 16:35:59	540	18.3	EAST
2018-07-05 16:35:59	180	17.5	EAST
2018-07-05 16:39:32	180	18.2	WEST
2018-07-05 16:39:37	180	17.9	EAST
2018-07-05 16:44:51	180	18.7	WEST
2018-07-05 16:44:56	180	18.4	EAST
2018-07-05 16:48:21	540	19.7	WEST
2018-07-05 16:48:21	180	18.8	WEST
2018-07-05 16:48:25	540	19.5	EAST
2018-07-05 16:48:25	180	18.5	EAST
2018-07-05 16:51:52	180	19.0	WEST
2018-07-05 16:51:56	180	18.8	EAST
2018-07-05 16:55:26	180	19.0	WEST
2018-07-05 16:55:30	180	18.8	EAST
2018-07-05 16:58:59	540	19.9	WEST
2018-07-05 16:58:59	180	19.3	WEST
2018-07-05 16:59:04	540	19.7	EAST
2018-07-05 16:59:04	180	19.0	EAST
2018-07-05 17:02:29	180	19.3	WEST
2018-07-05 17:02:34	180	19.0	EAST
2018-07-05 17:05:58	180	19.3	WEST
2018-07-05 17:06:03	180	19.0	EAST
2018-07-05 17:09:33	540	20.0	WEST
2018-07-05 17:09:33	180	19.3	WEST
2018-07-05 17:09:37	540	19.6	EAST
2018-07-05 17:09:37	180	19.0	EAST
2018-07-05 17:13:06	180	19.3	WEST
2018-07-05 17:13:10	180	19.1	EAST
2018-07-05 17:16:51	180	19.3	WEST
2018-07-05 17:16:56	180	19.0	EAST
2018-07-05 17:20:25	180	19.3	WEST
2018-07-05 17:20:29	180	19.0	EAST

The message may be cited.