GCN Circular 21169
Subject
GRB 170519A: CrAO optical observations
Date
2017-05-30T20:33:55Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), K. Antonyuk (CrAO), I. Nikolenko (CrAO), V. Rumyantsev
(CrAO), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger
GRB follow-up collaboration:
We observed the field of the GRB 170519A (Ukwatta et al., GCN 21106)
with AZT-11 telescope of CrAO observatory starting on May 19 (UT)
19:07:44, and with Zeiss-1000/Koshka telescope of Simeiz branch of CrAO
observatory starting on May 19 (UT) 19:28:57. We took several images in
filter R with exposures of 180 s. We clearly detect the afterglow
(Ukwatta et al., GCN 21106; Izzo et al., GCN 21108) in combined images.
Preliminary photometry of the combined images is following
UT start t-T0 Filter Exp. OT err UL Telescope
(mid, days) (s) (3sigma)
19:07:44 0.58810 R 6*180 19.17 0.11 20.9 AZT-11
19:26:08 0.59878 R 4*180 19.23 0.12 20.7 AZT-11
19:41:28 0.61473 R 9*180 19.58 0.12 21.1 AZT-11
19:28:57 0.59751 R 1*180 19.05 0.10 20.4 Zeiss-1000
19:31:58 0.60066 R 2*180 19.12 0.10 21.1 Zeiss-1000
19:38:02 0.60592 R 3*180 19.52 0.14 20.3 Zeiss-1000
19:47:08 0.61224 R 3*180 19.52 0.16 20.3 Zeiss-1000
19:56:13 0.62065 R 5*180 19.64 0.14 21.3 Zeiss-1000
The photometry is based on nearby SDSS stars:
SDSS-DR9_id R(Lupton)
J105339.53+252259.9 17.32
J105332.97+252127.3 16.22
J105348.21+252041.2 17.03
J105341.14+252534.0 16.18
J105353.70+252400.0 15.30