{
  "bibcode": "2021GCN.31079....1K",
  "body": "N Paul Kuin (UCL-MSSL) and Aaron Tohuvavohu (U Toronto) report on\nbehalf of the Swift/UVOT team:\n\nThe Swift/UVOT observed the field of the Swift/BAT-GUANO localisation (\nTohuvavohu et al, GCN Circ. 31049) of the INTEGRAL/SPI-ACS #9504 discovery\nof the short GRB211106A  using the white filter. The GRB was also reported\nby Fermi GBM (Fletcher, GCN Circ. 31055), Konus-Wind (Ridnaia et al.,\nGCN Circ. 31054). Ground-based follow up on XRT Source 2 by MeerLicht\n(de Wet et al, GCN Circ. 31063) at 17 hours past trigger found an upper\nlimit of q = 21.90; GROND around seventy hours after the trigger while\nmounted on the 2.2m MPG telescope find upper limits only ranging from\ng' > 24.8 to K > 19.8 (GCN Circ. 31069); Malesani et al used the VLT\nUT1/FORS2 also at 70 hours after triggger to place a limit R > 26.2.\n\nHere we report on upper limits for the XRT Source number 2 (see D'Elia et\nal, GCN Circ. 31051) which is the candidate afterglow (D'Elia et al, GCN\nCirc. 31068).\n\nSwift UVOT observed discontinuously starting day 0.45-0.67d, then day\n1.45-1.97, 2.6-3.7, 4.6-5.0 for a total of 19.5 ks. For these periods, the\n3-sigma UVOT upper limits are white > 23.2, 22.4, 22.7, 22.9 mag (Vega,\nBreeveld et al. 2011).\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.09 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 31079,
  "createdOn": 1636756028000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 211106A: Swift/UVOT upper limits",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 211106A"
}