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GCN Circular 23616

GRB 190106A: MASTER Amur OT detection
2019-01-06T14:20:15Z (5 years ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
V. Lipunov, A.Kuznetsov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, 
N.Tyurina,  P.Balanutsa,D. Vlasenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

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

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

K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University

R. Podesta, Carlos Lopez and F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato and Carlos 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, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory

MASTER-Amur robotic telescope (Global MASTER-Net:, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical 
University) was pointed to the  GRB190106.57 (Swift BAT alert, GCN 23615) 
20 sec after notice time and 
36 sec after trigger time at 2019-01-06 13:35:20 UT. On our first (10s 
exposure)  set we found optical transient  within SWIFT BAT error-box 
(ra=29.8792 dec=23.8567 r=0.05).
The 5-sigma upper limit has been about 16.5mag

RA, DEC = 01h 59m 31.20s +23d 50m 44.04s
mag = 16.0
The automatical photometry are:

start time	     coord2000		  Band	 mag	emag  exp

13:35:20.0   1h 59m 31.17s +23d 50m 44.5s   P   16.2    0.20   10
13:35:46.6   1h 59m 31.19s +23d 50m 44.8s   P	15.2	0.14   10
13:36:12.6   1h 59m 31.23s +23d 50m 44.1s   P	15.8	0.15   20
13:36:47.8   1h 59m 31.19s +23d 50m 44.6s   P	16.2	0.17   20
13:37:24.9   1h 59m 31.23s +23d 50m 44.5s   P	15.8	0.11   30
13:38:08.7   1h 59m 31.18s +23d 50m 44.2s   P	15.4	0.08   40 
13:39:03.1   1h 59m 31.17s +23d 50m 44.2s   P	15.7	0.07   50
13:40:07.0   1h 59m 31.18s +23d 50m 44.1s   P	15.5	0.09   60
13:41:35.5   1h 59m 31.20s +23d 50m 44.0s   P	15.6	0.10   60
13:43:03.7   1h 59m 31.18s +23d 50m 44.3s   P	15.9	0.11   60
13:44:28.9   1h 59m 31.18s +23d 50m 43.8s   P	16.1	0.12   60
to be continuated...

This optical counterpart is coincident with Swift optical object (Sonbas 
et al., GCN 23615).

The galactic latitude b = -36 deg., longitude l = 143 deg.
The observations made on zenit distance = 45 deg.The moon ( 0 % bright 
part) below the horizon (The altitude of the Moon is -50 deg. ).
The sun  altitude  is -53.7 deg.
The object can be observed till 2019-01-07 18:34:53

This message may be cited, but this is the first automatic photometry.
Non monotonic light curve was detected.
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