{
  "bibcode": "2022GCN.32738....1S",
  "body": "R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on\nbehalf of a larger collaboration:\n\nWe observed the GRB 221009A/Swift J1913.1+1946 (Dichiara et al., GCN 32632)\nfield with the LCOGT 1-meter Sinistro instrument at the McDonald\nObservatory, Texas, USA site, on October 13, from 03:34 to 04:18\n(corresponding to 84.60 to 85.50 hours from the GRB trigger time) with the\nSDSS g, r, and i filters.\n\nWe performed a series of 3x300s exposures in each band.  We do not detect\nthe optical transient at the UVOT coordinates (Dichiara et al., GCN 32632),\nin any bands.\n\nThe following upper limits are calculated using the Pan-STARRS catalog as\nreference:\n\ng > 22.3\nr > 21.4\ni > 20.5\n\nThese magnitudes are not corrected for galactic extinction.",
  "circularId": 32738,
  "createdOn": 1665676824000,
  "email": "rstrausb@umn.edu",
  "subject": "GRB221009A: LCOGT Continued Observations - Optical Upper Limits",
  "submitter": "Robert Strausbaugh at University of Minnesota  <rstrausb@umn.edu>",
  "eventId": "GRB 221009A"
}