GCN Circular 27582
Subject
GRB 200412B: continued Tautenburg observations
Event
Date
2020-04-15T09:30:32Z (6 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
B. Stecklum, S. Klose, S. Melnikov, and A. Nicuesa Guelbenzu (all
Tautenburg) report:
We continued observing the field of GRB 200412B (Fermi GBM team, GCN
27547) with the Tautenburg 1.34m Schmidt telescope equipped with the
TAUKAM 6k x 6k CCD camera and the wide V-band filter (VB; Stecklum et al.,
GCN 27567; Klose et al., GCN 27575).
For the optical transient (Lipunov et al., GCN 27555, 27556) at a mean
time of 2.521 days post burst we measure VB = 21.38 +/- 0.06. This is
about 0.2 mag fainter than expected for a decay slope of alpha = 1.582 +/-
0.004 based on our previous VB-band data (see also Xin et al., GCN 27571;
Belkin et al., GCN 27574), suggesting that the light curve decay is
steepening. Additional data are required to confirm (or reject) this
conclusion.
We note that in our images there is still no evidence for an underlying
host galaxy.