{
  "submitter": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
  "circularId": 35296,
  "submittedHow": "email",
  "bibcode": "2023GCN.35296....1S",
  "subject": "GRB231115A: TURBO Pre-Burst Optical Upper Limits",
  "eventId": "GRB 231115A",
  "body": "R. Strausbaugh (Eastern Illinois University), Daniel Warshofsky (UMN), Pat Kelly (UMN), Mandeep S. S. Gill (UMN), Alexandre Toscano (UMN), Yilin Lu(UMN), Sydney Leggio (UMN), Aksinya Kamenshikova (UMN) report on behalf of a larger collaboration:\n\n\nWe observed M82, including the localization region for the Fermi GRB 231115A (Fermi GBM team, GCN 35035), with the Total-Coverage Ultrafast Response to Binary-Mergers Observatory (TURBO) prototype telescope in St. Paul, Minnesota, USA, as part of a high-cadence ongoing survey for transients in nearby galaxies.  We visited the field 55 times on November 15 UT, with the last visit occurring at 9:06 UT in SDSS r and g bands respectively (corresponding to 6.5 hours before the GRB trigger time).\n\n\nEach exposure is 30 seconds.  We do not detect a source at the same location as the GROWTH-India counterpart (Kumar et al., GCN 35041) in either band.\n\n\nThe 3-sigma upper limits in the table below are calculated using the Pan-STARRS catalog as reference, and are not corrected for Galactic extinction.\n\n\nThe TURBO prototype in St. Paul consists of two co-mounted 11-inch telescopes each with a 6.6 square degree field of view.\n\n\nTURBO, which is under construction, will consist of two arrays of 8 pairs of co-mounted 11-inch telescopes at two dark-sky sites: Magdalena Ridge Observatory, New Mexico, USA and Skinakas Observatory, Crete, Greece.\n\n\nmjd\n\ng upper limit (AB)\n\nr upper limit (AB)\n\n60262.97035880\n\n-\n\n16.0\n\n60262.97244213\n\n16.9\n\n-\n\n60263.00063657408\n\n\n-\n\n15.9\n\n60263.00407407407\n\n-\n\n15.7\n\n60263.007106481484\n\n-\n\n16.1\n\n60263.012094907404\n\n-\n\n15.6\n\n60263.015555555554\n\n-\n\n15.9\n\n60263.01940972222\n\n-\n\n16.0\n\n60263.02327546296\n\n-\n\n15.9\n\n60263.02715277778\n\n-\n\n16.3\n\n60263.03057870371\n\n-\n\n16.1\n\n60263.034212962964\n\n-\n\n16.1\n\n60263.03765046296\n\n-\n\n16.4\n\n60263.04111111111\n\n-\n\n15.7\n\n60263.04293981481\n\n-\n\n15.8\n\n60263.04591435185\n\n16.5\n\n15.7\n\n60263.04896990741\n\n-\n\n16.4\n\n60263.05202546297\n\n16.5\n\n15.8\n\n60263.055\n\n16.5\n\n15.6\n\n60263.058020833334\n\n-\n\n15.8\n\n60263.061006944445\n\n-\n\n16.0\n\n60263.06407407407\n\n-\n\n15.9\n\n60263.070497685185\n\n-\n\n16.3\n\n60263.07403935185\n\n-\n\n16.2\n\n60263.07748842592\n\n-\n\n15.8\n\n60263.080462962964\n\n-\n\n16.3\n\n60263.08472222222\n\n-\n\n16.1\n\n60263.087592592594\n\n16.5\n\n16.4\n\n60263.09365740741\n\n16.4\n\n16.3\n\n60263.09645833333\n\n15.9\n\n16.5\n\n60263.099375\n\n-\n\n16.4\n\n60263.1171412037\n\n-\n\n16.7\n\n60263.120150462964\n\n16.3\n\n16.3\n\n60263.12315972222\n\n-\n\n15.4\n\n60263.14434027778\n\n16.6\n\n15.6\n\n60263.14716435185\n\n16.0\n\n15.7\n\n60263.15039351852\n\n15.7\n\n16.1\n\n60263.15372685185\n\n16.5\n\n16.0\n\n60263.156539351854\n\n15.8\n\n16.0\n\n60263.159421296295\n\n16.0\n\n16.3\n\n60263.162314814814\n\n16.6\n\n15.8\n\n60263.165138888886\n\n15.8\n\n16.8\n\n60263.16957175926\n\n16.3\n\n16.2\n\n60263.172997685186\n\n16.4\n\n-\n\n60263.176516203705\n\n16.5\n\n16.5\n\n60263.19818287037\n\n16.8\n\n15.8\n\n60263.21885416667\n\n16.9\n\n16.8\n\n60263.22230324074\n\n17.4\n\n17.0\n\n60263.24633101852\n\n17.3\n\n16.4\n\n60263.268900462965\n\n17.3\n\n16.6\n\n60263.27537037037\n\n16.9\n\n16.9\n\n60263.27885416667\n\n17.3\n\n17.0\n\n60263.283229166664\n\n17.0\n\n16.9\n\n60263.28666666667\n\n16.9\n\n17.0\n\n60263.29603009259\n\n17.4\n\n16.8\n\n",
  "createdOn": 1701898963446
}