{
  "bibcode": "2022GCN.31826....1R",
  "body": "A Rossi (INAF-OAS) report on behalf of the CIBO collaboration:\n\nWe observed the field of GRB 220403B (Klingler et al., GCN 31820) \nsimultaneously in the g',r',i' and z' bands with the LBC imager mounted \non LBT (Mt Graham, AZ, USA). We obtained 10min of imaging at the midtime \n04:02 UT on 2022-04-04, 0.3 days after the burst trigger. Observations \nwere performed under good weather conditions with an average seeing of \n~1.5\".\n\nWe clearly detect the afterglow and we preliminary measure\n\nr=20.9+-0.1 (AB system),\n\ncalibrated against Pan-STARRS field stars.\n\nWe acknowledge the excellent support from the LBTO and LBT-INAF staff, \nparticularly A. Cardwell and S. Allanson in obtaining these observations.",
  "circularId": 31826,
  "createdOn": 1649052684000,
  "email": "andrea.rossi@inaf.it",
  "subject": "GRB 220403B: LBT observations",
  "submitter": "Andrea Rossi at INAF  <andrea.rossi@inaf.it>",
  "eventId": "GRB 220403B"
}