{
  "bibcode": "2023GCN.34435....1K",
  "circularId": 34435,
  "createdOn": 1692107741358,
  "submitter": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
  "body": "\nS. Klose, S. Melnikov, B. Stecklum, A. Nicuesa Guelbenzu, and F. Ludwig (all TLS Tautenburg) report:\n\nWe 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.\n\nFor 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):\n\ng = 21.85 +/- 0.25  (midtime: August 14, 2023, 23:23:33 UT),\n\nr = 21.28 +/- 0.13  (midtime: August 14, 2023, 23:30:37 UT),\n\ni = 21.29 +/- 0.14  (midtime: August 14, 2023, 23:37:44 UT),\n\ncalibrated against SDSS stars in the field.\n",
  "subject": "GRB 230812B: Tautenburg observations",
  "eventId": "GRB 230812B",
  "submittedHow": "email"
}