{
  "body": "A.A. Breeveld (UCL-MSSL) and M. Ferro (INAF-OAB) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of the EP/WXT detected burst EP250908b (Yin et al., GCN Circ. 41752) 1103 s after the trigger. The afterglow reported by Ma et al. (GCN Circ. 41758) and also detected as source 1 in the Swift/XRT (Evans et al., GCN Circ. 41765), is detected in the initial U-band exposure.\n\nThe preliminary magnitude using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposure is:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nu              1103         2836           1706           20.0 +/- 0.14\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.048 in the direction of the burst (Schlegel et al. 1998).\n",
  "circularId": 41766,
  "submitter": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
  "submittedHow": "email",
  "eventId": "EP250908b",
  "createdOn": 1757449569036,
  "bibcode": "2025GCN.41766....1B",
  "subject": "EP250908b/EP#01709240653: Swift/UVOT Detection"
}