{
  "bibcode": "2022GCN.32327....1N",
  "body": "K. Noonan (UVI), P. Gokuldass (Florida Institute of Technology), N. Orange\n(OrangeWave Innovative Science, LLC), K. Smith (UVI), D. Morris (UVI)\nreport:\n\nWe observed the field of GRB220408A (Caputo et al., GCN 31848) with the\n0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin\nIslands' Etelman Observatory on 04-08-2022 starting at 23:53:07.963 UT\n(T+18.7 hrs). We performed a series of exposures in the R filter with a\ntotal exposure of 6180 s. The weather conditions were partly cloudy during\nthe hours of observation with an average airmass of 1.5.\n\nWe detect no new source within the enhanced XRT position error circle (A.P.\nBeardmore et al., 31852), consistent with other non-detections  ( Zheng &\nFilippenko, GCN 31850; Jiang et al., GCN 31853; Kumar et al., GCN 31857;\nand Gregory et al., GCN 31867)  and report the following 5-sigma upper\nlimit:\n\nT_mid            ||Exposure     ||Filter      ||Limit\n\nT+ 19.5 hrs    ||6180s          ||R            ||>20.8\n\nThe limit is estimated from comparison to nearby USNO B1 stars and is not\ncorrected for Galactic extinction. The VIRT is still in the commissioning\nphase.\n\nWe acknowledge financial support from NASA MUREP MIRO award 80NSSC21M0001, NASA\nEPSCoR award 80NSSC19M0060, and NSF EiR award 1901296.This message can be\ncited.",
  "circularId": 32327,
  "createdOn": 1657043728000,
  "email": "priyadass.94@gmail.com",
  "subject": "GRB220408A: VIRT Optical Upper Limit",
  "submitter": "Priyadarshini Gokuldass at U. of the Virgin Islands  <priyadass.94@gmail.com>",
  "eventId": "GRB 220408A"
}