{
  "bibcode": "2018GCN.22718....1R",
  "body": "A. Rossi and E. Palazzi (INAF-OAS) report on behalf of the CIBO \ncolaboration:\n\nWe  observed the field of GRB180512A (Swift trigger 832119; Deich et \nal., GCN #22710) simultaneously in r' and z' bands with the LBC imager \nmounted on LBT (Mt Graham, AZ, USA). Observations started at 04:05 UT on \n2018-05-13, 6 hrs after the GRB trigger and finished at 04:27 UT and \nallowed us to obtain 20min of exposure in each band.\n\nImage inspection reveals a faint source within the Swift/XRT enhanced \nerror circle (Evans et al., GCN 22715) with coordinates:\nRA(J2000) = 13:27:45.130\nDec(J2000)= +21:24:13.39\nwith an uncertainty of 0.2\" in each coordinate.\n\nThe source is detected only r'-band and has magnitude r' = 25.0 mag \n+-0.3 (AB), calibrated against r'-band SDSS field stars. No statement \nabout the variability can be made at this point. Further observations \nare planned.\n\nNo correction for the expected Galactic foreground extinction\ncorresponding to a reddening of E_(B-V)=0.02 mag in the direction of the \nburst (Schlafly & Finkbeiner 2011) has been applied.\n\nWe acknowledge the excellent support from the LBT-INAF staff, \nparticularly F. Cusano and A. Gargiulo in obtaining these observations.",
  "circularId": 22718,
  "createdOn": 1526217181000,
  "email": "a.rossi@iasfbo.inaf.it",
  "subject": "GRB 180512A: LBT optical detection",
  "submitter": "Andrea Rossi at INAF  <a.rossi@iasfbo.inaf.it>",
  "eventId": "GRB 180512A"
}