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GCN Circular 30628

Subject
GRB 210807A: Tautenburg observations
Date
2021-08-11T11:37:11Z (3 years ago)
From
Ana Nicuesa at TLS Tautenburg <ana@tls-tautenburg.de>
S. Schmidl, A. Nicuesa Guelbenzu, S. Klose, S. Melnikov, B. Stecklum, U.
Laux (all Tautenburg) and J. Greiner (MPE Garching) report:


We observed the field of GRB 210807A (Lien et al., GCN 30600) with the
Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6kx6k CCD
camera.

Observations started at 23:19 UT on August 7, about 13 hours after the GRB
trigger. For the optical afterglow (Lien et al., GCN 30600; Hu et al., GCN
30602; LaPorte et al. GCN 30618) we measure the following magnitudes:

r = 21.66 +/- 0.18, at a midtime of August 7, 23:28 UT,
i = 21.25 +/- 0.19, at a midtime of August 8, 01:16 UT,
z = 20.52 +/- 0.19, at a midtime of August 8, 01:26 UT.

Second-epoch observations were performed the following night.
The optical transient was not detected anymore:

r  22.2, at a midtime of August 8, 23:34 UT,
i  22.4, at a midtime of August 9, 00:38 UT,
z  21.2, at a midtime of August 9, 01:20 UT.

Given magnitudes are calibrated against the Pan-STARRS catalogue.
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