[vsnet-grb-info 23890] Swift GRB191011.19: Global MASTER-Net OT detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25989
SUBJECT: Swift GRB191011.19: Global MASTER-Net OT detection
DATE:    19/10/11 04:50:49 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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

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

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

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

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

D. Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory

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

MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the  GRB191011.19 14 sec after notice time and 34 sec after trigger time at 2019-10-11 04:36:30 UT. On our 3-th (30s exposure)  set , obtained 148 sec after tigger time at 2019-10-11 04:38:25 UT, we  found 1 optical transient within Swift error-box (ra=44.7208 dec=-27.845 r=0.05) brighter than 15.7.


 T-Tmid      Date      Time       Expt.        Ra                Dec           Mag
---------|---------------------|-------|-----------------|-----------------|-------
     163   2019-10-11 04:38:25      30   (02h 58m 48.339s , -27d 51m 48.55s)    16.26

The OT has irregular early time  behaviour since 410.7 till 643.2 seconds after the trigger.
The 5-sigma upper limit has been about 15.7mag
The message may be cited.