[vsnet-grb-info 21671] GRB 190123A: MASTER Global Robotic Net optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23770
SUBJECT: GRB 190123A: MASTER Global Robotic Net optical observation
DATE:    19/01/23 13:27:41 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E. Gorbovskoy, N.Tiurina, P.Balanutsa, D.Vlasenko, V.Vladimirov, A.Kuznetsov,  D.Kuvshinov, A.Chasovnikov
(Lomonosov Moscow State University,SAI, Physics Department),

O. Gres, N.M. Budnev, 
(Applied Physics Institute of Irkutsk State University)

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

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

D. Buckley (South African Astronomical Observatory)

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


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

H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE)

MASTER-Tunka robotic telescope (MASTER Global Robotic Net http://observ.pereplet.ru,
Lipunov et al., 2010, Advances in Astronomy, v.2010, 30L)
  located in Russia (Applied Physics Institute, Irkutsk State University)
was pointed to the  GRB190123A 17 sec after notice time (66 sec after trigger time)
at 2019-01-23 12:20:25 UT.
On our first (10s exposure) image we don't find  optical transient  within 
SWIFT-XRT error-box ( A. D'Ai et al. GCN 23769 RA,Dec(2000)=03h 32m 52.97s +45d 31' 27.3" r=4")
up to 16.7 unfiltered magnitude limit (5-sigma)

The galactic latitude b = -8 deg., longitude l = 151 deg.
The observations made on zenit distance =  7 deg.
The Moon altitude is -1 deg. (92 % bright part)
The sun  altitude  is -24.7 deg.


MASTER-Amur robotic telescope ocated in Russia (Blagoveshchensk State Pedagogical University)
was pointed to the  GRB190123A 27 sec after notice time (77 sec after trigger time)
  at 2019-01-23 12:20:35 UT.
On our first (10s exposure, mlim=16.3 (5-sigma)) image we don't find optical transient
within SWIFT-XRT error-box.

The observations made on zenit distance = 15 deg.
The moon (92 % bright part) is 14 deg. above the horizon.
The sun  altitude  is -40.1 deg.

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