{
  "subject": "GRB 210619B: REM optical/NIR afterglow detection",
  "eventId": "GRB 210619B",
  "bibcode": "2021GCN.30288....1D",
  "createdOn": 1624280405000,
  "circularId": 30288,
  "submitter": "Paolo D'Avanzo at INAF-OAB  <pda.davanzo@gmail.com>",
  "email": "pda.davanzo@gmail.com",
  "body": "P. D'Avanzo, A. Melandri, S. Covino, D. Fugazza, (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of GRB 210619B (D'Avanzo et al., GCN Circ. 30261) with the REM 60cm robotic telescope \nlocated at the ESO premise of La Silla (Chile). The observations were carried in the g, r, i, z, J, H and K bands, starting \non 2021 June 20 at 06:07:59 UT (i.e. 6.14 hours after the burst) and lasting for about one hour. \n\nThe optical/NIR afterglow (D'Avanzo et al., GCN Circ. 30261) is detected in all bands. From preliminary photometry we \nderive the following magnitudes: \n\nr = 18.52 +/-  0.12\n(AB; calibrated against the Pan-STARRS catalogue)\n\nJ = 17.10  +/- 0.24 \nH = 16.61  +/- 0.25 \nK = 15.13  +/- 0.23 \n(Vega; calibrated against the 2MASS catalogue)\n\nat a mid time of t-t0 = 6.3 hours."
}