GCN Circular 27166
Subject
GRB 200219C: OAJ afterglow confirmation
Date
2020-02-21T20:03:17Z (5 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
M. Blazek, D. A. Kann (both HETH/IAA-CSIC), A. de Ugarte Postigo
(HETH/IAA-CSIC, DARK/NBI), C. C. Thoene, J. F. Agui Fernandez (both
HETH/IAA-CSIC), N. Maicas, and J. L. Lamadrid (both CEFCA) report:
We observed the position of the Fermi GBM/LAT GRB 200219C (Fermi GBM
team, GCN #27145, Hamburg et al., GCN #27155, Dirirsa et al., GCN
#27151) with the Javalambre Observatory OAJ 80cm telescope in g'r'i'z',
obtaining 3 x 300 s exposures in g'r' each, and 5 x 180 s exposures in
i'z' each. Observations started on 2020-02-21, 03:17:55 UT. No
observations were obtained the night before as the LAT position came
only after twilight had started.
In the stacked r' image (midtime 1.14375 days after the GRB), we clearly
detect a source within the enhanced XRT error circle (Burrows et al.,
GCN #27157) for which we measure r'(AB) = 22.11 �� 0.13 mag against
PanSTARRS field stars.
We note this implies a decay compared with the afterglow discovery by
Reva et al. (GCN #27162) who find R ~ 21.72 �� 0.15 mag (AB) about six
hours earlier. It is still brighter than the PanSTARRS host galaxy
magnitude given by Xu et al. (GCN #27161) at r' = 22.70 �� 0.15 mag.
The relatively bright host galaxy may be indicative of a low-redshift
event. As the source is improving in visibility and will be observable
for several months to come, a search for associated supernova emission
may be worthwhile. Spectroscopy is encouraged.