TITLE: GCN CIRCULAR NUMBER: 31775 SUBJECT: GRB220319A: Optical observations from NOT DATE: 22/03/20 13:47:37 GMT FROM: Antonio de Ugarte Postigo at OCA A. de Ugarte Postigo (OCA) and R. Clavero Jimenez (NOT) report on behalf of a larger collaboration: We observed the field of GRB220319A (Page et al. GCN31769) with the 2.5m Nordic Optical Telescope equipped with AlFOSC. Observations consisted of 3x300s in r and 5x200s in z. Due to variable weather conditions, the observation was attempted twice, between 22:12 and 22:47 UT and between 00:10-00:48 UT (starting 4.53 and 6.49 hr after the burst). We also note the high background due to the illumination from the almost full Moon. The first attempt had a seeing of 1.5“ in r and 1.3“ in z and was affected by some dome vignetting due to the low elevation. The second observation had better conditions with 1.2“ seeing in r and 1.1“ in z. In a preliminary reduction, we do not detect any new source within or near the refined XRT position (Goad et al. GCN 31771) in any of the images. We estimate a 3-sigma limit of z > 21.5 mag in the first epoch and > 22.5 mag in the second epoch.