{
  "subject": "GRB 230420A: LCOGT Optical Upper Limit",
  "bibcode": "2023GCN.33662....1S",
  "submitter": "Robert Strausbaugh at University of Minnesota <rstrausb@umn.edu>",
  "body": "R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the GRB 230420A (Klingler et al., GCN 33658) field with the\nLCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site,\non April 20, from 20:28 to 20:55 UT (corresponding to 11.15 to 11.72 hours\nfrom the GRB trigger time) with the SDSS r and i filters.\n\nWe performed a series of 3x300s exposures in each band.  We do not detect a\nsource within the Swift-XRT enhanced error region (Osborne et al., GCN\n33661) in either band.\n\nThe following upper limits are calculated using the PanSTARRS catalog as\nreference:\n\nr > 22.3\ni > 21.8\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "eventId": "GRB 230420A",
  "circularId": 33662,
  "createdOn": 1682032877264
}