{
  "bibcode": "2023GCN.33426....1N",
  "body": "K. Noonan (UVI), N. Orange (OrangeWave Innovative Science, LLC), P.\nGokuldass (Florida Tech), D. Morris (UVI), K. Smith (UVI), R. Querrard\n(UVI) report:\n\nWe observed the field of GRB 230228A (Dichiara et al., GCN 33378) with\nthe 0.5m Virgin Island Robotic Telescope (VIRT) at the University of\nthe Virgin Islands' Etelman Observatory on 02-28-2023 starting at\n23:29:41 UT (T+17.5 hrs). We performed a series of exposures in the R\nfilter with a total exposure of 2940s. The weather conditions were\nclear during the hours of observation. The GRB was positioned at a\nlower altitude with an average airmass of 2.7.\n\nWe detect no new source within the enhanced XRT position error circle\n(Beardmore et al., GNC 33382) consistent with other non-detections\n(Lim et al., GCN 33380, Lu et al., GCN 33381, Belkin et al., GCN\n33383, Hu et al., GCN 33387, and Breeveld et al., GCN 33392) and\nreport the following 3-sigma upper limit:\n\nT_mid            ||Exposure     ||Filter      ||Limit\nT+ 18 hrs       ||2940s          ||R            ||>20.6\n\nThe limit is estimated from comparison to nearby USNO B1 stars and is\nnot corrected for Galactic extinction. The VIRT is still in the\ncommissioning phase.\n\nWe acknowledge financial support from NASA MUREP MIRO award\n80NSSC21M0001, NASA EPSCoR award 80NSSC22M0063, and NSF EiR award\n1901296. R.Q. and N.B.O. also acknowledge financial support from South\nCarolina Space Grant award 80NSSC20M0054. This message can be cited.",
  "circularId": 33426,
  "createdOn": 1678310143000,
  "email": "pgokuldass2020@my.fit.edu",
  "subject": "GRB 230228A: VIRT Optical Upper Limit",
  "submitter": "Priya Gokuldass at Florida Tech  <pgokuldass2020@my.fit.edu>",
  "eventId": "GRB 230228A"
}