{
  "bibcode": "2011GCN.11970....1X",
  "body": "D. Xu (WIS), J. P. U. Fynbo (DARK/NBI), M. Nielsen (NOT), and P.\nJakobsson (U. Iceland) report on behalf of a large collaboration:\n\nWe continued to observe the field of GRB 110422A (Mangano  et al., GCN\n11957) at the Nordic Optical Telescope (NOT) equipped with ALFOSC. We\nobtained 2x300 s, 3x300 s, and 3x300 s images in the R, V, and I\nfilters, respectively. The images, with an airmass ~1.5, were still\ntaken with strong wind.\n\nThe optical afterglow (Elunko et al., GCN 11958; Xu et al., GCN 11961)\nhas decayed to R=21.41+/-0.10 mag with a median time 21:06:08.9 UT on\nApril 23 (i.e., 29.4 hr after the BAT\ntrigger), compared with our previous measurement R=20.00+/-0.02 mag,\nboth calibrated with the #1651-0050630 star (R1=19.08) in the USNO B1\ncatalog. The observations at the two epochs indicates a power-law\ndecay index of ~0.8 for the R-band lightcurve.",
  "circularId": 11970,
  "createdOn": 1303597431000,
  "email": "dong.xu@weizmann.ac.il",
  "subject": "GRB 110422A: Further NOT observation",
  "submitter": "Dong Xu at Weizmann Inst  <dong.xu@weizmann.ac.il>",
  "eventId": "GRB 110422A"
}