{
  "bibcode": "2021GCN.29549....1P",
  "body": "D. A. Perley (LJMU) reports:\n\nA short ugriz imaging sequence of the optical afterglow of GRB 210222A \n(Gropp et al. 29545) was obtained using IO:O on the robotic Liverpool \nTelescope between 23:39 and 23:50 UT on 2021-02-22.  Photometry relative \nto PS1 standards in the field gives the following magnitudes:\n\nt-t0 (d)      magnitude\n0.04333 :  g = 18.67 +/- 0.04\n0.04440 :  r = 18.21 +/- 0.03\n0.04544 :  i = 18.01 +/- 0.03\n0.04971 :  z = 17.83 +/- 0.06\n\nThe g-band photometry lies below an extrapolation of the other bands and \nthe source is not detected in u-band, which may suggest a moderately \nhigh redshift.\n\n\n\n\n\n\n\n\n\n\n\nDisclaimerNone",
  "circularId": 29549,
  "createdOn": 1614040337000,
  "email": "d.a.perley@ljmu.ac.uk",
  "subject": "GRB 210222B: Liverpool Telescope optical detection",
  "submitter": "Daniel Perley at Liverpool JMU  <d.a.perley@ljmu.ac.uk>",
  "eventId": "GRB 210222B"
}