{
  "subject": "GRB 230812B: iTelescope optical upper limit",
  "submitter": "Filipp Dmitrievich Romanov at Amateur astronomer <filipp.romanov.27.04.1997@gmail.com>",
  "body": "I observed the field of GRB 230812B (Fermi GBM team, GCN Circ. 34386)\nremotely using telescope T24 (0.61-m f/6.5 reflector + CCD) of\niTelescope.Net in Sierra Remote Observatory (Auberry, California, USA)\non 2023-08-14. Six images (exposures 300 seconds, BINx1) were obtained\nwith Ic filter with mid time 05:10:04 UT (1.424 d. after the trigger).\nI did not detect any optical afterglow in the Swift/XRT (Page, GCN\nCirc. 34394) position. The magnitude limit is about 19 mag, compared\nto the magnitudes of nearby stars from the USNO-B1.0 Catalog (Monet et\nal., 2003).\nF. D. Romanov (AAVSO member, observer code: RFDA).\n\n",
  "circularId": 34443,
  "eventId": "GRB 230812B",
  "createdOn": 1692160045669,
  "submittedHow": "email-legacy",
  "bibcode": "2023GCN.34443....1R"
}