{
  "bibcode": "2023GCN.33488....1S",
  "body": "R. Strausbaugh (UMN), D. Warshofsky (UMN), P. L. Kelly (UMN), M. Tran (UMN)\nreport on behalf of a larger collaboration:\n\nWe observed the GRB 2303014A (Fermi GBM Team, GCN 33474) field with the\nTotal-Coverage Ultrafast Response to Binary-Mergers Observatory (TURBO)\nprototype telescope in St. Paul, Minnesota on March 14, from 05:02 to 08:36\nUT (corresponding to 2.01 to 5.52 hours after GRB trigger) in SDSS g and\nr-band filters.\n\nWe acquired a series of 30x60s exposures over the entire observing period\nin each band covering an area of about 12 square degrees with corners for\neach field listed in the table below.  We do not detect any fading sources\nin the GBM error region in either band, consistent with available optical\nupper limits (Lipunov et al., GCN 33249).\n\nThe following 3-sigma upper limits in AB magnitudes are calculated using\nthe Pan-STARRS catalog as reference:\n\nFilt. | Corners of fields (hh:mm:ss,dd:mm:ss)| Upper Limit\n\n���---------------------------------------------------------------------------------------------\n\ng | (15:08:41,+75:20:31) ,(16:08:31,+74:24:12) |18.2\n\n���---------------------------------------------------------------------------------------------\n\nr | (16:06:24,+75:12:04) ,(15:08:34,+74:04:37) |18.6\n\n���---------------------------------------------------------------------------------------------\n\ng | (15:20:58,+75:20:08) ,(16:20:45,+74:23:31) |18\n\n���---------------------------------------------------------------------------------------------\n\nr | (16:18:28,+75:12:01) ,(15:20:35,+74:03:47) |18.7\n\n���---------------------------------------------------------------------------------------------\n\ng | (15:12:17,+73:21:35) ,(16:05:17,+72:25:04) |18.3\n\n���---------------------------------------------------------------------------------------------\n\nr |(16:03:27 ,+73:12:08) ,(15:12:06,+72:04:05) |18.7\n\n���---------------------------------------------------------------------------------------------\n\ng | (15:24:16,+73:21:38) ,(16:17:16,+72:25:03) |18.1\n\n���---------------------------------------------------------------------------------------------\n\nr | (16:15:22,+73:12:30) ,(15:23:58,+72:04:42) |18.7\n\n���---------------------------------------------------------------------------------------------\n\ng | (15:04:23,+77:18:32) ,(16:13:02,+76:22:15) |18.2\n\n���---------------------------------------------------------------------------------------------\n\nr | (16:10:49,+77:10:25) ,(15:04:38,+76:01:38) |18.6\n\n���---------------------------------------------------------------------------------------------\n\ng | (15:16:20,+77:18:47) ,(16:24:59,+76:22:30) |18.1\n\n���---------------------------------------------------------------------------------------------\n\nr | (16:22:46,+77:10:29) ,(15:16:35,+76:01:37) |18.7\n\nThese magnitudes are not corrected for foreground Galactic extinction.\n\nThe TURBO prototype in St. Paul consists of two co-mounted 11-inch\ntelescopes each with a 6.6 square degree field of view. TURBO will consist\nof two arrays of 8 pairs of co-mounted 11-inch telescopes at two dark-sky\nsites: Magdalena Ridge Observatory, New Mexico, USA and Skinakas\nObservatory, Crete, Greece.",
  "circularId": 33488,
  "createdOn": 1679345520000,
  "email": "rstrausb@umn.edu",
  "subject": "GRB 230314A: TURBO Optical Upper Limit",
  "submitter": "Robert Strausbaugh at University of Minnesota  <rstrausb@umn.edu>",
  "eventId": "GRB 230314A"
}