GCN Circular 27464
Subject
GRB 200325B: Tautenburg observations
Date
2020-03-28T20:01:16Z (4 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
S. Klose, B. Stecklum, A. Nicuesa Guelbenzu, S. Melnikov, and F. Ludwig
(all Tautenburg) report:
We observed the field of GRB 200325B (Ferni GBM team, GCN 27441) 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. Observations were performed
during several epochs starting 1.2 days after the burst.
The optical transient discovered by the MASTER Global Robotic Net (Lipunov
et al., GCN 27446) is clearly detected (see also Pozanenko et al., GCN
27452; Belkin et al., GCN 27455; Strausbaugh et al., GCN 27456; D'Avanzo
et al., GCN 27457). Aperture photometry was performed using several Gaia
DR2 stars in the field. Between dt = 1.2 and 2.4 days the optical
transient was fading by 1.3 mag. During our last observation (2.4 days
post burst) it had reached VB = 20.7 +/- 0.2 mag.