TITLE:   GCN CIRCULAR
NUMBER:  34459
SUBJECT: GRB 230816A: Tautenburg observations
DATE:    23/08/16 21:06:26 GMT
FROM:    Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>


S. Klose, S. Melnikov, B. Stecklum, A. Nicuesa Guelbenzu, F. Ludwig (all TLS Tautenburg) report:

We observed the field of GRB 230816A (Siegel et al., GCN 34450) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6kx6k CCD camera and using the Sloan filter set.

For the optical transient discovered by Jiang et al. (GCN 34453) we measure the following preliminary magnitudes:

r = 21.75 +/- 0.25  (midtime: August 16, 2023, 20:23:11 UT),

i = 20.33 +/- 0.08  (midtime: August 16, 2023, 20:34:05 UT),

calibrated against USNO stars in the field. The photometry will still be improved by calibrating the data via a nearby Pan-STARRS field.