{
  "bibcode": "2024GCN.38558....1S",
  "body": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Swift GRB 241213A field (Gupta et al., GCN 38547)  with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory USA site, on December 13, from 06:49 to 07:19 UT (corresponding to 4.50 to 5.00 hours after the GRB trigger time) with the sdss r and i filters.\n\nWe performed a series of 3x300s exposures in i-band and 2x300s in r-band.  We do not detect a source within the Swift XRT enhanced error region (Osborne et al., GCN 38552) in either band, consistent with other optical upper limits (Lipunov et al., GCN 38548; Spiridonova et al., GCN 38550; Brivio et al., GCN 38553).\n\nThe following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:\n\nr > 21.2\ni > 21.5\n\nThese magnitudes are not corrected for galactic extinction.\n",
  "createdOn": 1734100134548,
  "subject": "GRB 241213A: LCOGT Optical Upper Limits",
  "submitter": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
  "submittedHow": "email",
  "circularId": 38558,
  "eventId": "GRB 241213A"
}