{
  "bibcode": "2017GCN.21134....1G",
  "body": "C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc \n(U. Nova Gorica), C.G. Mundell (U. Bath), A. Cucchiara, D. Morris, B. \nGendre (U. of Virgin Islands) on behalf of a large collaboration report:\n\nWe began observing Fermi-LAT GRB 170522A (Arimoto et al. GCN 21127; \nStanbro et al. GCN 21126; Lipunov et al. GCN 21132) on May 23, 03:07 UT \n(11.4 hours since the GRB) with the 1-m LCO unit at the LCO McDonald \nobservatory with the SDSS i filter. Within the LAT error circle we do \nnot detect any uncatalogued source down to i~19 mag in a 3x120s stacked \nframe, as calibrated against nearby SDSS stars.\nAlthough all of the four X-ray sources reported by Swift-XRT (Mingo et \nal. GCN 21133) lie outside the LAT error circle, three of them (Sources \n1, 2, 3) happen to lie within our field of view. We did not find \nuncatalogued counterparts in any of the corresponding error circles down \nto the same limit.",
  "circularId": 21134,
  "createdOn": 1495637571000,
  "email": "guidorzi@fe.infn.it",
  "subject": "GRB 170522A: LCO McDonald observations",
  "submitter": "Cristiano Guidorzi at Ferrara U,Italy  <guidorzi@fe.infn.it>",
  "eventId": "GRB 170522A"
}