{
  "bibcode": "2020GCN.29207....1I",
  "body": "L. Izzo (DARK/NBI), P. D'Avanzo (INAF-OAB), E. Brocato (INAF-OAA/INAF-OAR) report on behalf of GRAWITA:\n\nWe observed the field of the short GRB 201227A (Fermi/GBM trigger 630774852; Ursi et al., GCN Circ. 29179; \nSvinkin et al., GCN Circ. 29182; Xiao et al., GCN Circ. 29187; Svinkin et al., GCN Circ. 29196; Lesage et al., \nGCN Circ. 29206) with the VLT Survey Telescope (VST) equipped with OmegaCAM (1 square degree FOV; \nProposal ID ESO 0106.D-0343(A)). \nWe obtained one epoch of observations with the r filter on 2020-12-28 between 07:10:07 UT and 07:32:12 UT \n(i.e. between 15.93 and 16.30 hours after the burst t0). \n\nThe observations cover 2 square degrees enclosing ~ 100% of the IPN localization box (Svinkin et al., GCN Circ. 29182). \nEach one square degree pointing is the coaddition of five dithered exposures for a total exposure time of 300 seconds per \npointing. \n\nFrom a preliminary analysis, we find no clear optical counterpart of GRB 201227A inside the IPN error box down to a 3sigma \nlimiting magnitude of r ~ 22 (AB, calibrated against the SkyMapper survey). \n\nIn particular, we do not find optical countepart candidates at the position of the four Swift/XRT sources reported by D'Elia et al. \n(GCN Circ. 29202) nor at the position of the only galaxy listed in the GLADE catalogue found inside the IPN error box (galaxy \ncoordinates (J2000): RA, Dec = 168.85910, -73.94917, redshift z = 0.1379; Dalya et al., 2018, MNRAS, 479, 2347). \n\nFurther analysis is in progress. \n\n\nWe acknowledge excellent support from the ESO observing staff at Paranal, in particular Bin Yang.",
  "circularId": 29207,
  "createdOn": 1609353504000,
  "email": "pda.davanzo@gmail.com",
  "subject": "GRB 201227A: GRAWITA VST-ESO PARANAL observations",
  "submitter": "Paolo D'Avanzo at INAF-OAB  <pda.davanzo@gmail.com>",
  "eventId": "GRB 201227A"
}