{
  "bibcode": "2019GCN.23713....1S",
  "body": "J. Selsing (DAWN/NBI and DAWN/DTU), A. de Ugarte Postigo (HETH/IAA-CSIC\nand DARK/NBI), and S. Dyrbye (NOT), report on behalf of a larger\ncollaboration:\n\nWe have observed the optical afterglow of GRB GRB190114B (Siegel et al.,\nGCN 23686; Goad et al., GCN 23691) at the 2.5-m Nordic Optical Telescope\n(NOT). We have obtained an griz-band imaging sequence using the ALFOSC\ninstrument, with 3x300s exposure in gri-band and 5x200s in z-band.\nObservations began at 01:51:42 UT, on the night of the 14th of January,\n6.3 hr after the BAT trigger.��\n\nIn the images we confirm the detection of the optical counterpart in\nFernandez-Garcia et al. (GCN 23694) and Pozanenko et al. (GCN 23696) and\nreport further fading. The source is located at:\n\nRA (J2000.0) = 11:39:29.823\nDEC (J2000.0) = +18:53:28.19\n\nwith the astrometric solution calibrated against the 2MASS catalog.��\n\nWe calibrate the photometric zeropoints against the Pan-STARRS catalog\nand calculate the following magnitudes for the optical counterpart:\n\ng = 21.61 +- 0.13 AB mag��\nr = 21.15 +- 0.09 AB mag��\ni = 20.96 +- 0.04 AB mag��\nz = 20.59 +- 0.08 AB mag",
  "circularId": 23713,
  "createdOn": 1547556800000,
  "email": "jselsing@dark-cosmology.dk",
  "subject": "GRB 190114B: NOT optical counterpart",
  "submitter": "Jonatan Selsing at DARK/NBI  <jselsing@dark-cosmology.dk>",
  "eventId": "GRB 190114B"
}