GCN Circular 21208
Subject
GRB 170519A: TShAO and AbAO optical observations
Date
2017-06-05T19:41:04Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), A. Kusakin (Fesenkov Astrophysical
Institute), R. Inasaridze (AbAO), I. Reva (Fesenkov Astrophysical
Institute), 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 GRB 170519A (Ukwatta et al., GCN 21106) with
Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory
starting on May 20 (UT) 18:42:38. We took several images in R-filter
with exposures of 120 s during this night and 2 subsequent nights.
The optical afterglow (Ukwatta et al., GCN 21106; Izzo, et al.,
GCN 21108) is visible in stacked images.
We also observed this field with AS-32 (0.7m) telescope of Abastumani
Observatory on May 21 (UT) 17:22:33. We took several unfiltered frames
with 60 s exposure. In the enhanced XRT error circle (Beardmore et al.,
GCN 21107) we do not detect the afterglow.
Preliminary photometry of the afterglow is following:
Date UT start t-T0 Filter Exp. OT Err. UL Telescope
(mid, days) (s) (3 sigma)
2017-05-20 18:42:38 1.58414 R 24*120 20.06 0.06 21.4 Zeiss-1000
2017-05-21 15:58:25 2.48340 R 39*120 20.95 0.14 21.6 Zeiss-1000
2017-05-22 15:27:05 3.46168 R 39*120 22.20 0.40 21.9 Zeiss-1000
2017-05-21 17:22:33 2.52050 CR 20*60 n/d n/d 20.8 AS-32
The photometry is based on nearby SDSS stars, reported by
Mazaeva et al. (GCN 21169).
The light curve of the GRB 170519A afterglow based on our observations
(GCNs 21162, 21169, 21206) can be found at
http://grb.rssi.ru/GRB170519A/GRB170519A_lc.png
