{
  "submittedHow": "email",
  "submitter": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
  "body": "S. R. Oates (Lancaster U.) and S. Dichiara (PSU)  report on \nbehalf of the Swift-XRT and Swift-UVOT team:\n\nSwift/UVOT has performed further follow-up observations of the Einstein\nProbe/WXT-detected source EP250821a (Hu et al., GCN 41459). The UVOT optical\ncounterpart reported in (Dichiara et al., GCN 41469) has faded, consistent\nwith the behaviour reported by Li et al. (GCN 41470) and Yao et al. (GCN 41485).\n\nThe refined UVOT position is\n\n    RA (J2000)  19:19:32.56\n   Dec (J2000) -43:22:52.3\n\nwith an estimated uncertainty of 0.5 arcsec (radius, 90% confidence). We note that\nthis position supersedes that reported in Dichiara et al. (GCN 41469), which\nis incorrect. We apologise for any confusion. \n\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter  T_start(s)   T_stop(s) Exp(s)     Mag/3sigUL\n   v        61584        72904      799       >19.9\n   u         5186         11029    1897       18.88+\\-0.08 (reported in GCN 41469)\n   u       68377         68575      195       >19.8\nuvw1    67966         68372     399       >20.0\nuvm2    67555         67961     399       >19.8\nuvw2    61180         72857    1168       >20.2\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.07 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n",
  "createdOn": 1755855874730,
  "bibcode": "2025GCN.41491....1O",
  "eventId": "EP250821a",
  "circularId": 41491,
  "subject": "EP250821a: Swift/UVOT further observations."
}