TITLE:   GCN CIRCULAR
NUMBER:  30629
SUBJECT: GRB 210730A: Tautenburg observations
DATE:    21/08/11 15:15:49 GMT
FROM:    Ana Nicuesa at TLS Tautenburg  <ana@tls-tautenburg.de>

S. Schmidl, A. Nicuesa Guelbenzu, S. Klose, S. Melnikov, B. Stecklum, C.
Hoegner (all Tautenburg) and J. Greiner (MPE Garching) report:

We observed the field of GRB 210730A (Sonbas et al., GCN 30548) with the
Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6kx6k CCD
camera.

Observations started at 20:38 UT on July 30, about 15 hours after the GRB
trigger. Consistent with the non-detection of an afterglow candidate by
D'Avanzo et al. (GCN 30560) and Hu et al. (GCN 30563), we do not detect
any new source inside the XRT error circle (Beardmore et al., GCN 30550).
Calibrated against SDSS stars in the field, for any transient we provide
an upper limit of r(AB) > 21.8 mag.