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GCN Circular 34435

GRB 230812B: Tautenburg observations
2023-08-15T13:55:41Z (10 months ago)
Sylvio Klose at TLS Tautenburg <>

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

We observed the field of GRB 230812B (Lesage et al., GCN 34387; Roberts et al., GCN 34391; Scotton et al., GCN 34392; Xiong et al., GCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6k x 6k CCD camera. Observations consisted of 3 x 90 sec exposures using the Sloan g, r, and i-band filter.

For the optical transient (first reported by Zheng et al., GCN 34395, and Lipunov et al, GCN 34396) we measure the following preliminary AB magnitudes (2.19 days post burst):

g = 21.85 +/- 0.25  (midtime: August 14, 2023, 23:23:33 UT),

r = 21.28 +/- 0.13  (midtime: August 14, 2023, 23:30:37 UT),

i = 21.29 +/- 0.14  (midtime: August 14, 2023, 23:37:44 UT),

calibrated against SDSS stars in the field.

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