GCN Circular 20300
Subject
GRB 161219B: LCO Sutherland observations
Event
Date
2016-12-20T08:31:43Z (9 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc
(U. Nova Gorica), C.G. Mundell (U. Bath) on behalf of a large
collaboration report:
We observed Swift GRB 161219B (D'Ai et al. GCN 20296) on December 19,
from 20:43 to 20:56 UT (1.9-2.1 hours since the GRB) with 1-m LCO
telescope units in Sutherland with SDSS r and i filters. Within the
enhanced enhanced XRT error circle (Beardmore et al. GCN 20297) we
clearly detect the optical counterpart reported by UVOT (D'Ai et al.)
with the following values:
Mid Time Exposure Filter Magnitude
(hours) (s)
-------------------------------------------------------
1.93 120 SDSS-R 17.38 +- 0.02
1.93 120 SDSS-I 16.72 +- 0.02
-------------------------------------------------------
as calibrated against nearby USNOB-1 source RA(J2000)=06:06:52.743,
DEC(J2000)=-26:46:29.49 using nominal R2=15.12 mag, I=14.37 mag.
We however point out that the source is positionally coincident with a
USNOB-1 source: 06:06:51.366, -26:47:29.80, which has nominal R2=20.14
mag. This likely corresponds to the extended galaxy mentioned by
Kruehler et al (GCN 20299) in Pan-STARRS data.