TITLE:   GCN CIRCULAR
NUMBER:  40510
SUBJECT: GRB 250502A: Tautenburg observations
DATE:    25/05/21 14:09:26 GMT
FROM:    Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>


K. Kritik, L. Berthel, T. Ranganathan, J. Kahl, S. Schmidl (all FSU Jena),
M. Hartmann, B. Stecklum, S. Klose (all Tautenburg) report:

We observed the field of GRB 250502A (Wang et. al., GCN 40313) with
the 1.3m Schmidt telescope using the prime focus CCD
camera. Observations started on May 2, 2025, at 22:18:13 UT, about
13.5 hrs after the SVOM trigger, at a mean airmass of 2.2.

The optical transient first reported by Rakotondrainibe et. al. (GCN
40315) was clearly detected. Based on 40 min of exposure, at a midtime
of 22:38 UT, we measure a preliminary r-band magnitude (AB) of 20.88
+/- 0.20 mag, calibrated against Pan-STARRS DR1. We apologize for the
late submission of this circular.