GCN Circular 19435
Subject
SGR 1935+2154: AbAO optical upper limit
Event
Date
2016-05-18T19:43:53Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Volnova (IKI), R. Inasaridze (AbAO), V. Ayvazian
(AbAO), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger
GRB follow-up collaboration:
We observed the field of SGR 1935+2154 triggered by Swift (Barthelmy et
al., GCN 19430; D'Avanzo et al., GCN 19433) and Fermi (Yu et al., GCN
19434) with AS-32 (0.7m) telescope of Abastumani Observatory starting
on May 16 (UT) 23:26:26. We obtained several unfiltered images of the
field. We do not detect any source within XRT error circle (D'Avanzo et
al., GCN 19433).
Preliminary photometry of the field is following
Date UT start t-T0 Filter Exp. UL (3 sigma)
(mid, days) (s)
(after GCN 19430 trig.)
2016-05-16 23:26:26 0.14112 none 29*60 20.4
We also note a variable star in the field in coordinates (J2000)
19:34:30.09 +21:52:06.2 and R=15.33 +/- 0.04 which coincides with a star
of USNO-B1.0 1118-0440363, R2 = 19.38. The star is not related to the
SGR 1935+2154.
Photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1119-0448829 14.61
1119-0448214 16.24
1118-0440633 14.34
1118-0440733 14.93
A finding chart can be found at
http://grb.rssi.ru/SGR1935+2154/SGR1935+2154_20160516_AbAO.png