{
  "bibcode": "2021GCN.29645....1R",
  "body": "A Rossi (INAF-OAS) report on behalf of the CIBO collaboration:\n\nWe observed the field of GRB 210306A (D'Elia et al., GCN 29597) \nsimultaneously in the r' and z' bands with the LBC imager mounted on LBT \n(Mt Graham, AZ, USA). We obtained 20min of imaging on 2021-03-11, 5.06 \ndays after the burst trigger. Observations were performed under good \nweather conditions with an average seeing of ~1.2\".\n\nWe clearly detect the afterglow and we preliminary measure\n\nr=24.2+-0.2 (AB system),\n\ncalibrated against SDSS field stars. This is still in agreement with the \nlate decay index alpha~1.1 (after an initial plateau ending at ~2hours \nafter the burst trigger) obtained modelling the photometry available \n(Strausbaugh et al., GCN29600; Zhu et al., GCN 29607; Hentunen & \nNissinen GCN 29603; Hosokawa et al., GCN29608; Dimple et al., GCN 29618; \nBelkin et al., GCN 29616, GCN 29620, 29635; Klose et al., GCN 29644).\n\nWe acknowledge the excellent support from the LBTO and LBT-INAF staff, \nparticularly J. Power, J. Williams F. Cusano, and D. Paris, in obtaining \nthese observations.",
  "circularId": 29645,
  "createdOn": 1615465293000,
  "email": "andrea.rossi@inaf.it",
  "subject": "GRB 210306A: LBT observations",
  "submitter": "Andrea Rossi at INAF  <andrea.rossi@inaf.it>",
  "eventId": "GRB 210306A"
}