{
  "bibcode": "2021GCN.29567....1D",
  "body": "P. D'Avanzo, S. Covino, D. Fugazza, A. Melandri (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of GRB 210222B (Gropp et al., GCN Circ. 29545) with the REM 60cm robotic telescope \nlocated at the ESO premise of La Silla (Chile). The observations were performed starting  on 2021 February 23 \nat 00:18:20 UT (i.e. 1.68 hours after the burst) and were carried in the g, r, i, z, J and H bands. \n\nThe optical afterglow (Gropp et al., GCN Circ. 29545) is detected in all bands. \n\nFrom preliminary photometry we obtain for the optical/NIR afterglow the following magnitudes:\n\nr = 18.85 +/- 0.13 (AB; calibrated against the Pan-STARRS catalogue)\nH = 16.39 +/- 0.20 (Vega; calibrated against the 2MASS catalogue)\n\nat a mid time of t-t0 = 1.93 hours.",
  "circularId": 29567,
  "createdOn": 1614288586000,
  "email": "pda.davanzo@gmail.com",
  "subject": "GRB 210222B: REM observations of the optical/NIR afterglow",
  "submitter": "Paolo D'Avanzo at INAF-OAB  <pda.davanzo@gmail.com>",
  "eventId": "GRB 210222B"
}