{
  "bibcode": "2022GCN.32809....1R",
  "body": "A. Rossi, E. Maiorano (INAF-OAS), D. B. Malesani (Radboud Univ. and \nDAWN/NBI)on behalf of the CIBO collaboration, F. Cusano (INAF-OAS),��and \nD. Paris (INAF-OA Roma), report:\n\nWe observed the field of GRB 221009A (Dichiara et al., GCN 32632; Kennea \n& Williams, GCN 32635; Veres et al.,��GCN 32636; Bissaldi et al., GCN \n32637; Svinkin et al., GCN 32641; Ursi et al., GCN Circ. 32650) \nsimultaneously in the blue and red arms with the g'+r' and g'+i'��bands \nwith the MODS instrument mounted on LBT (Mt Graham, AZ, USA). We \nobserved for 22 min per arm at the midtime 03:11 UT on 2022-10-18, 8.58 \ndays after the burst trigger. Observations were performed under modest \nweather conditions with an average seeing of ~1\" but high humidity and \npassing cirrus.\n\nWe clearly detect the afterglow and we preliminary measure\n\nr=21.63+-0.02 (AB system),\n\ncalibrated against Pan-STARRS field stars.\n\nWe acknowledge the excellent support from the LBTO and LBT-INAF staff, \nparticularly A. Becker and D. G. Huerta in obtaining these observations.",
  "circularId": 32809,
  "createdOn": 1666279443000,
  "email": "andrea.rossi@inaf.it",
  "subject": "GRB221009A: LBT optical imaging",
  "submitter": "Andrea Rossi at INAF  <andrea.rossi@inaf.it>",
  "eventId": "GRB 221009A"
}