GCN Circular 26059
Subject
GRB 191019A: Nanshan-0.6m optical observations
Date
2019-10-22T13:58:53Z (5 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu, B.Y. Yu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School)
report:
We observed the field of GRB 191019A (Simpson et al., GCN 26031) using
the 0.6m NEXT telescope located at Nanshan, Xinjiang, China.
Observations started at 15:34:01 UT (i.e., 21.5 min after the BAT
trigger) and ended at 18:22:51 UT on 2019-10-19, and a series of 60 s,
200 s, 300 s Sloan r-band frames were obtain in a high airmass.
A source is detected in our images at the XRT position (Osborne et al.,
GCN 26043), which is already present in Pan-STARRS with m(r) = 19.12 +/-
0.01. The source had m(r) = 18.96 +/- 0.10 at the beginning and decayed
to m(r) = 19.19 +/- 0.10 in about an hour. Because the flux difference
is small and observations were carried out in high airmass, it's not
clear if there is a GRB afterglow contribution. Our measurements are in
agreement with that by NOT (Perley et al., GCN 26039; Fynbo et al., GCN
26041) and GROND (Guelbenzu et al., GCN 26042).