{
  "bibcode": "2021GCN.30028....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 210515C (D'Ai, et al., GCN 30020) with the LCO 1-m Sinistro instrument at the Cerro Tololo Interamerican Observatory, Chile site, on May 16, from 09:37 to 09:51 UT (corresponding to 13.58 to 13.82 hours from the GRB trigger time) with the Bessel R and I filters.\n\nWe performed a series of 3x130s exposures in R and I. We do not detect an uncatalogued optical source in the coadded images in the XRT enhanced error region (Osborne, et al., GCN 30023).  Using the USNO-B.1 catalog as reference, we calculate the following upper limits:\n\nR>21.47\n\nI>20.62\n\nThese magnitudes are not corrected for galactic extinction.\n\nR.S. is funded by NSF AST grant #1831682",
  "circularId": 30028,
  "createdOn": 1621184531000,
  "email": "robert.strausbaugh@uvi.edu",
  "subject": "GRB 210515C: LCO Optical Upper Limit",
  "submitter": "Robert Strausbaugh at U. of the Virgin Islands  <robert.strausbaugh@uvi.edu>",
  "eventId": "GRB 210515C"
}