{
  "bibcode": "2021GCN.30770....1S",
  "body": "R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:\n\nWe observed Swift GRB 210905A (Sonbas, et al., GCN 30765) with the LCO 1-m Sinistro instrument at the Cerro Tololo Interamerican Observatory, Chile site, on September 5, from 02:32 to 02:53 UT (corresponding to 2.37 to 2.72 hours from the GRB trigger time) with the Bessel I filter.\n\nWe performed a series of 5x300s exposures in I band. We detect the same uncataloged source (Strausbaugh, et al., GCN 30769) at the following coordinates (309.0481637, -44.4402618).  Using the USNO-B.1 catalog as reference, we calculate the following magnitude:\n\nI=20.4+/-0.1\n\nThese magnitudes are not corrected for galactic extinction.  There is clear evidence of fading from the first epoch (I=19.52+/-0.09) providing strong evidence that this is the afterglow of this burst.\n\nR.S. is funded by NSF AST grant #1831682",
  "circularId": 30770,
  "createdOn": 1630816404000,
  "email": "robert.strausbaugh@uvi.edu",
  "subject": "GRB 210905A: Continued LCO Optical Observations",
  "submitter": "Robert Strausbaugh at U. of the Virgin Islands  <robert.strausbaugh@uvi.edu>",
  "eventId": "GRB 210905A"
}