{
  "bibcode": "2022GCN.32709....1V",
  "body": "J. Vinko, A. Bodi, A. Pal, L. Kriskovics, R. Szakats, K. Vida\n(Konkoly Observatory, Hungary) report:\n\nWe observed the field of the bright GRB221009A (Dichiara et al., GCN #32632, Veres et al., GCN #32636)\nwith the RC80 robotic telescope at Piszkesteto Station of Konkoly Observatory on 2022 Oct 10.81 UT \nand Oct 12.85 UT, during inferior sky conditions. A series of 300 sec frames were collected through \nSloan r'- and i' bands. The bright optical afterglow\n(Lipunov et al. GCN #32634; Perley et al. GCN #32638; Broens GCN #32640; Hu et al. GCN #32644;\nBelkin et al. GCN #32645; Wet et al. GCN #32646; Xu et al. GCN #32647; de Ugarte Postigo et al.\nGCN #32648; Odeh GCN #32649; Brivio et al. GCN #32652; Kuin et al. GCN #32656;\nPaek et al. GCN #32659; Kumar et al. GCN #32662; Romanov GCN #32664; Odeh GCN #32666;\nChen et al. GCN #32667; Vidal et al. GCN #32669; Kim et al. GCN #32670; Groot et al. GCN #32678;\nRomanov GCN #32679; Castro-Tirado et al. GCN #32686; Watson et al. GCN #32692; Strausbaugh et al.\nGCN #32693; Butler et al. GCN #32705)\nwas 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)\n2022-10-10  19:26:51    30.16     600      18.74 (0.12)     17.50 (0.08)\n2022-10-12  20:18:24    79.02     300      20.58 (0.70)     18.74 (0.18)\n\nThese magnitudes are not corrected for galactic extinction.",
  "circularId": 32709,
  "createdOn": 1665613795000,
  "email": "vinko@konkoly.hu",
  "subject": "GRB221009A: optical afterglow measurements from Konkoly Observatory",
  "submitter": "Jozsef Vinko at Konkoly Observator  <vinko@konkoly.hu>",
  "eventId": "GRB 221009A"
}