{
  "bibcode": "2021GCN.29562....1G",
  "body": "P. Gokuldass (UVI), N. Orange (OrangeWave Innovative Science, LLC), R.\nStrausbaugh (UVI), A. Cucchiara (UVI/College of Marin),\nD. Morris (UVI) report:\n\nWe observed the field of GRB210222B (Gropp et al, GCN 29545) with the\n0.5m Virgin Island Robotic Telescope (VIRT)\nat the University of the Virgin Islands' Etelman Observatory on\n02-23-2021 starting at 02:14:31 UT (T+3.6hrs).\nWe performed a series of exposures in R filter with a total exposure\nof 4600 s. The weather conditions were clear\nduring the hours of observation with an average air masses as shown in\nthe table below.\n\nWe detect the optical transient reported by others (Gropp et al., GCN\n29545, Hu et al., GCN 29546,Strausbaugh et al.,\nGCN 29547, Mong et al., GCN 29548, Perley, GCN 29549, Aqui Fernandez\net al., GCN 29552, Lipunov et al., GCN 29554,\nJelinik et al., GCN 29557) at > 3-sigma confidence with magnitudes as\nreported below:\n\nT_mid       ||Exposure     ||Filter      ||Limit         ||Airmass\nT+4.5 hrs   ||2000s        ||R           ||18.5 +/- 0.1  ||1.7\nT+8.5 hrs   ||2600s\t   ||R           ||20.0 +/- 0.2  ||1.5\n\nThe magnitude is estimated from comparison to nearby USNO B1 stars and\nis not corrected for Galactic extinction.\nFurther analysis is in progress. The VIRT is still in the commissioning phase.\n\nThis work is supported by NASA-MUREP-MIRO grant NNX15AP95A, NSF EiR\nAST Award 1901296, and NSF HBCU-UP AST Award 1831682.\nThis message can be cited.",
  "circularId": 29562,
  "createdOn": 1614139856000,
  "email": "priyadass.94@gmail.com",
  "subject": "GRB 210222B: VIRT optical detection",
  "submitter": "Priyadarshini Gokuldass at U. of the Virgin Islands  <priyadass.94@gmail.com>",
  "eventId": "GRB 210222B"
}