TITLE:   GCN CIRCULAR
NUMBER:  25231
SUBJECT: IceCube-190730A: MASTER optical observation
DATE:    19/07/31 07:24:46 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov,
D. Vlasenko, I.Gorbunov,D.Zimnukhov, V.Senik, A.Chasovnikov, D.Kuvshinov(Lomonosov Moscow State University, SAI, Physics Department),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
D. Buckley (South African Astronomical Observatory),
O. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)

MASTER Global Robotic Net ( http://observ.pereplet.ru, Lipunov et al., 2010,Advances in Astronomy, vol. 2010, 30L)
observed IceCube-190730A (Stein et al. GCN 25225) in alert mode.

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU,SAI Crimea astronomical station)
was pointed to the IceCube Alert 190730.87 ( 15h  7m 19.25s , +10d 30m 28.08s, R=0.7552)
errorbox  28 sec after notice time (62 sec after trigger time)
at 2019-07-30 20:51:43 UT, with upper limit 18 mag.
The observations began when error-box altitute = 22 deg, the sun  altitude  was -26.1 deg.

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory, Canarias) was 
pointed to the IceCube Alert 190730.87 errorbox  56 sec after notice time (89 sec after trigger time)
  at 2019-07-30 20:52:11 UT, with upper limit up to 20 mag.
Observations started at twilight, began when error-box altitude = 65 deg, the sun  altitude  was -12.4 deg.

The error-box galactic latitude b = -60 deg., longitude l = 98 deg.

MASTER cover map is available 
http://master.sai.msu.ru/static/IC/MASTERcovermapofIC190730A.jpg

AGNs and poss.OT analysis inside error box will be continued.
The message may be cited.