{
  "bibcode": "2022GCN.31361....1V",
  "body": "J. Vinko, A. Pal, L. Kriskovics, R. Szakats, K. Vida  \n(Konkoly Observatory, Hungary) report:\n\nWe observed the field of GRB220101A (Tohuvavohu et al., GCN #31347; Arimoto et al., \nGCN #31350; AGILE Ursi et al., GCN #31354) \nwith the RC80 robotic telescope at Piszkesteto Station of Konkoly\nObservatory on 2022 Jan 01  starting at 21:32:18 UT. A series of 5x300 sec\nframes were collected through Sloan r'- and i' bands. The bright optical afterglow\n(Kuin & Tohuvavohu, GCN #31351; Fu et al., GCN #31353; Hentunen et al., GCN\n#31356; Perley, GCN #31357; Ugarte Postigo et al. GCN #31358; Fynbo et al. GCN #31359)\nis clearly detected on the stacked frames with the following magnitudes, calibrated\nvia nearby PS1 stars:\n\nDate         UT-middle   t-T0(hr)  Exp(s)   r'(AB-mag)       i'(AB-mag)\n2022-01-01   21:52:52    16.73     5x300    19.81 +/- 0.12   18.67 +/- 0.14",
  "circularId": 31361,
  "createdOn": 1641084781000,
  "email": "vinko@konkoly.hu",
  "subject": "GRB220101A: optical afterglow detection from Konkoly Observatory",
  "submitter": "Jozsef Vinko at Konkoly Observator  <vinko@konkoly.hu>",
  "eventId": "GRB 220101A"
}