{
  "bibcode": "2021GCN.29431....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 210207B (Lien, GCN 29420) with the LCO 1-m Sinistro instrument at the McDonald Observatory, Texas, USA site, on February 8, from 11:23 to 11:34 UT (corresponding to 13.30 to 13.48 hours from the GRB trigger time) with the Bessel R and I filters.\n\nWe performed a series of 5x60s exposures in R and I. We clearly detect an optical source in R and I band in stacked images at a location consistent the initial UVOT detection (Lien, GCN 29420).  Using the USNO-B.1 catalog as reference, we calculate the following magnitudes:\n\nR = 20.24 +/- 0.13\n\nI = 20.56 +/- 0.24\n\nThese magnitudes are not corrected for galactic extinction.  A quick catalog search found no galaxies at this brightness at this location.  Further observations are encouraged.\n\nR.S. is funded by NSF AST grant #1831682",
  "circularId": 29431,
  "createdOn": 1612803376000,
  "email": "robert.strausbaugh@uvi.edu",
  "subject": "GRB 210207B: LCO Optical Afterglow Detection",
  "submitter": "Robert Strausbaugh at U. of the Virgin Islands  <robert.strausbaugh@uvi.edu>",
  "eventId": "GRB 210207B"
}