{
  "submitter": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
  "circularId": 34346,
  "createdOn": 1691276330654,
  "submittedHow": "web",
  "subject": "GRB 230805B: NOT optical afterglow confirmation",
  "body": "D. B. Malesani (Radboud Univ. and DAWN/NBI) and T. Pursimo (NOT) report on behalf of a larger collaboration:\n\nWe observed the location of GRB 230805B (Cenko et al., GCN 34339) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were secured in the r and z bands. An object with position consistent with the one reported by Moskvitin & Goranskij (GCN 34343) is well detected in our data. Based on nearby stars from the Gaia catalog, we measure the following J2000 coordinates, with an error of ~0.3\":\n\nRA  = 13:50:58.23\nDec = +31:11:28.6\n\nAt a mean epoch 2023 Aug 5.91 UT (10.4 hr after the trigger), we measure a preliminary magnitude (calibrated against nearby Pan-STARRS point-like sources) r = 23.5 +- 0.15 AB. Compared to the measurement by Moskvitin & Goranskij (GCN 34343), our magnitude value provides 2-sigma evidence for fading, consistent with afterglow behavior.",
  "eventId": "GRB 230805B",
  "bibcode": "2023GCN.34346....1M"
}