{
  "bibcode": "2021GCN.29955....1D",
  "body": "P. D'Avanzo (INAF-OAB), V. D'Elia (ASI-SSDC), D. Malesani (DTU Space), E. Palazzi, A. Rossi (INAF-OAS), \nG. Andreuzzi, D. Carosati (INAF-TNG) on behalf of the CIBO collaboration report:\n\nWe observed the field of the short GRB 210506A (Tohuvavohu & DeLaunay, GCN Circ. 29947) with the Italian 3.6m TNG \ntelescope equipped with NICS in imaging mode. A series of images were obtained with the J filter on 2021-05-06 from \n21:15:04 UT to 21:55:59 UT (i.e. at a mid time of about 20.9 hours after the burst). \n\nOur observations (with a field of view of 4.2' x 4.2') were centered at the position of the XRT source #3 \n(see: https://www.swift.ac.uk/ToO_GRBs/00021430/ and Evans, GCN Circ. 29949). \n\nNo obvious source is found within the position of source XRT #3 down to a 3-sigma limiting magnitude of J > 20.6 \n(Vega, calibrated against the 2MASS catalogue). \nUnfortunately an image artefact, possibly due to bad sky subtraction, prevented us to visually investigate a portion \n(~ 5%) of the XRT error circle for source #3.",
  "circularId": 29955,
  "createdOn": 1620346510000,
  "email": "pda.davanzo@gmail.com",
  "subject": "GRB 210506A: TNG NIR upper limits",
  "submitter": "Paolo D'Avanzo at INAF-OAB  <pda.davanzo@gmail.com>",
  "eventId": "GRB 210506A"
}