{
  "subject": "GRB 260208A: Swift UVOT detection",
  "body": "Paul Kuin (MSSL/UCL) and Brad Cenko (NSA/GSFC) reports on behalf of\nthe Swift/UVOT team:\n\nThe Swift/UVOT began observations of the Fermi-detected GRB 260208A\n35.4 ks after the Fermi Trigger (Fermi GBM team, GCN Circ. 43635;\nLongo et al., GCN Circ. 43645). We detect the afterglow at the position\ngiven by Podesta et al., GCN Circ. 43640. Preliminary 3-sigma upper\nlimits using the UVOT photometric system  (Breeveld et al. 2011,\nAIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure\nand subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite          35662.9       41566.1       1208      20.84 +/-0.10\n\n \nwhite          46325.8       47072.6        735      21.45 +/-0.21\n\n\nu              35131.3       40857.7       1208      20.34 +/-0.14\n\n \nu              45572.3       46319.1        735      20.12 +/-0.15\n                                                             \n\nv              36195.1       47089.2        938      20.01 +/-0.32\n",
  "editedOn": 1770904053041,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Paul Kuin at MSSL <npkuin@gmail.com>",
  "circularId": 43702,
  "createdOn": 1770831746995,
  "eventId": "GRB 260208A",
  "submitter": "Paul Kuin at MSSL <npkuin@gmail.com>",
  "version": 2,
  "bibcode": "2026GCN.43702....1K",
  "format": "text/plain",
  "submittedHow": "email"
}