{
  "bibcode": "2001GCN...976....1O",
  "body": "Jerome A. Orosz, Utrecht University, The Netherlands, reports:\n\nI have observed the field of GRB010222 (GCN 959,960) with the 1 meter\nJacobus Kapteyn Telescope on La Palma.  The conditions were nearly\nphotometric (very thin cirrus moved in at the last minute) and the seeing\nwas 1.2 arcseconds.  The preliminary magnitudes given are with respect to\nstar 'A' in Stanek et al.'s finding chart (GCN 970):\n\nUT start        Filter  exptime     airmass     delta_mag\non Feb 23\n\n06:16:28.0         R     600.0      1.037762    2.95 +/- 0.06\n06:27:43.0         V     600.0      1.043099    2.83 +/- 0.07\n06:38:45.0         I     600.0      1.050021    2.66 +/- 0.13\n06:49:46.0         R     600.0      1.058645    2.82 +/- 0.15\n\nThus assuming star A has R=17, then the OT had R = 19.95 +/- 0.06\non UT 23.2614.\n\nI have observed several Landolt fields that can be used to approximately\ncalibrate the field after the fact.  These images and the GRB images are\navailable upon request.\n\nThis message can be cited.",
  "circularId": 976,
  "createdOn": 982912731000,
  "email": "J.A.Orosz@astro.uu.nl",
  "subject": "GRB 010222:  Optical Observations",
  "submitter": "Jerome A. Orosz at Astro. Inst, Utrecht U.  <J.A.Orosz@astro.uu.nl>",
  "eventId": "GRB 010222"
}