GCN Circular 19976
Subject
GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
Date
2016-10-02T10:08:33Z (8 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
R.Podesta, C.Lopez, F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)
H. Levato, C. Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
D.Buckley, S. Potter,
South African Astronomical Observatory
E.Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov,
O.Gress, P.Balanutsa, A.Kuznetsov, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute
R. Rebolo, M. Serra Ricart, N. Lodieu, G. Israelian
The Instituto de Astrofisica de Canarias
K.Ivanov, J.Rabinovich, N.M.Budnev,
Irkutsk State University
A. Tlatov, V.Senik, D. Dormidontov, A.Parkhomenko
Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, A.Gabovich
Blagoveschensk Educational State University, Blagoveschensk
MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in OAFA was pointed to the GRB161001A 29 sec after notice
time and 41 sec after trigger time at 2016-10-01 01:05:57UT. On our
first (10s exposure) set we not found OT within 6 square degrees
field around SWIFT BAT error-box (Page et al., GCN 19967; Markwardt et
al.,GCN 19974 ) brighter then 16.7 unfiltered magnitude.
MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in SAAO was pointed to the GRB161001A 167 sec after notice time
and 176 sec after trigger time at 2016-10-01 01:08:17 UT. On our first
(40s exposure) set we haven`t found optical transient within SWIFT
error-box.
The 5-sigma upper limit has been about 18.4 mag
We found optical object at first hour coadded images by both MASTERs
telescopes at coordinates Ra 04:47:40.83 Dec -57:15:38.07 (+-0.7 arcsec
error) with unfiltered magnitude:
0.8R +0.2B = 20.6 (+0.1 -0.4)
with respect to USNO B stars. We have archival images in MASTER SAAO
DataBase at 2016-04-09 with 20.9 3-SIGMA limit. We see same object at
same position.
We note that our scale is 1 pix ~ 2 arcsec . So the DSS2 object (Kruehler
et al., GCN 19971) and GROND afterglow candidate (Chen et al., GCN 19975)
are inside the our pixel.
The message may be cited.