{
  "bibcode": "2022GCN.31775....1D",
  "body": "A. de Ugarte Postigo (OCA) and R. Clavero Jimenez (NOT) \nreport on behalf of a larger collaboration:\n\nWe observed the field of GRB220319A (Page et al. GCN31769) \nwith the 2.5m Nordic Optical Telescope equipped with AlFOSC. \nObservations consisted of 3x300s in r and 5x200s in z. Due to variable \nweather conditions, the observation was attempted twice, between \n22:12 and 22:47 UT and between 00:10-00:48 UT (starting 4.53 and \n6.49 hr after the burst). We also note the high background due to the \nillumination from the almost full Moon. The first attempt had a seeing \nof 1.5��� in r and 1.3��� in z and was affected by some dome vignetting \ndue to the low elevation. The second observation had better conditions \nwith 1.2��� seeing in r and 1.1��� in z. \n\nIn a preliminary reduction, we do not detect any new source within or \nnear the refined XRT position (Goad et al. GCN 31771) in any of the \nimages. We estimate a 3-sigma limit of z > 21.5 mag in the first epoch \nand > 22.5 mag in the second epoch.",
  "circularId": 31775,
  "createdOn": 1647784057000,
  "email": "deugarte@oca.eu",
  "subject": "GRB220319A: Optical observations from NOT",
  "submitter": "Antonio de Ugarte Postigo at OCA  <deugarte@oca.eu>",
  "eventId": "GRB 220319A"
}