GCN Circular 21654
Subject
GRB 170822A: AbAO optical upper limit
Date
2017-08-23T13:14:20Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), R. Inasaridze (AbAO), A. Pozanenko (IKI), A.
Volnova (IKI), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G.
Inasaridze (AbAO), I. Molotov (KIAM) report on behalf of larger GRB
follow-up collaboration:
We observed the field of the Swift GRB 170822A (Melandri et al.,
GCN 21640)) with AS-32 (0.7m) telescope of Abastumani Observatory
starting on August, 22 (UT) 22:43:12. We obtained several unfiltered
images of the field. Within enhanced XRT error circle (Beardmore et
al., GCN 21643) we do not detect the afterglow candidate (Tello et
al, GCN 21642). Preliminary photometry of the field is following
Date UT start t-T0 Filter Exp. OT Err UpLim (3 sigma)
(mid, days) (s)
2017-08-22 22:43:12 0.58255 CR 32*60 n/d n/d 22.2
Photometry is based on nearby USNO-B1.0 stars R2 magnitudes
USNO-B.1_id R2
1450-0165651 15.44
1450-0165657 15.54
1450-0165669 16.19
1450-0165558 16.58
1450-0165549 15.60
1450-0165573 15.28
1449-0164981 16.05
A finding chart can be found at
http://grb.rssi.ru/GRB170822A/GRB170822A_AAO_170822+Bootes-OT.png
