GCN Circular 27567
Subject
GRB 200412B: Tautenburg observations
Date
2020-04-13T12:26:07Z (4 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 observed the field of GRB 200412B (Fermi GBM team, GCN 27547; Mailyan
et al., GCN 27558; see also Burgess et al., GCN 27548; Longo et al., GCN
27557; Page et al., GCN 27561; Gupta et al., GCN 27563; Zheng et al., GCN
27565) with the Tautenburg 1.34m Schmidt telescope equipped with the
TAUKAM 6k x 6k CCD camera and the wide V-band filter (VB). The
transmission curve of this filter closely follows the Gaia GBP filter.
The fading optical transient detected by MASTER Global Robotic Net
(Lipunov et al., GCN 27555, 27556) is clearly detected on our images (for
other optical observations see also Kumar et al., GCN 27564; Belkin et
al., GCN 27566). Using Gaia DR2 stars in the field, we measure the
following preliminary magnitudes (Vega system):
Mean time: April 12, 21:29:48 UT, VB = 18.43 +/- 0.01
Mean time: April 13, 02:22:38 UT, VB = 19.00 +/- 0.01