{
  "createdOn": 1767522948670,
  "submittedHow": "web",
  "body": "N. Klingler (NASA-GSFC / UMBC / CRESST II) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 260101A 144 s after the BAT trigger (Cenko et al., GCN Circ. 43285). A source consistent with the enhanced XRT position (Evans et al., GCN Circ. 43289) is detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  05:45:42.96 =  86.42898 (deg.)\n    Dec (J2000) = +63:35:32.1  =  63.59226 (deg.)\nwith an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).\n\nDetections and 2-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the exposures are: \n\n\nFilter   T_start(s)   T_stop(s)   Exp(s)    Mag\n\nb          399.7        419.5      19.8     16.57 +/- 0.10\nb          548.6        568.4      19.8     16.74 +/- 0.11\nb          697.4        717.1      19.7     16.80 +/- 0.11\nb          847.1        866.9      19.8     17.20 +/- 0.14\nb         1031.0       1200.3     169.3     17.50 +/- 0.11\nb         1329.9       1498.6     168.7     17.69 +/- 0.12\nb         1628.4       1648.2      19.8     17.81 +/- 0.18\nb        21638.8      22547.2     908.4     21.07 +/- 0.27\n\nu          144.3        394.1     249.8     16.09 +/- 0.05\nu          523.8        543.5      19.7     16.44 +/- 0.13\nu          672.6        692.3      19.7     17.15 +/- 0.18\nu          822.4        842.1      19.7     16.97 +/- 0.16\nu          875.8       1025.6     149.8     17.12 +/- 0.08\nu         1155.7       1324.8     169.1     17.86 +/- 0.18\nu         1454.1       1623.5     169.4     17.86 +/- 0.18\nu        95366.4      96053.5     687.1     >21.51\n\nv          450.4        470.2      19.8     16.17 +/- 0.14\nv          599.0        618.8      19.8     15.87 +/- 0.12\nv          747.6        767.4      19.8     16.28 +/- 0.15\nv         1081.4       1251.3     169.9     16.98 +/- 0.15\nv         1380.2       1549.5     169.3     17.23 +/- 0.17\nv        11438.4      12223.4     785.0     19.27 +/- 0.14\nv        27138.9      28046.0     907.1     20.55 +/- 0.38\n\nuvw1        499.5        816.9     317.4    >19.48\nuvw1       1131.1       1599.0     467.9    >19.74\nuvw1      34121.1      34973.5     852.4    >21.44\n\nuvw2        425.8        743.0     317.2    >19.43\nuvw2       1057.0       1525.2     468.2    >19.72\nuvw2      10532.3      11432.0     899.7    >21.06\nuvw2      22553.7      23374.5     820.8    >21.39\nuvw2     100888.2     101273.5     385.3    >20.96\n\nuvm2        474.7        643.2     168.5    >18.78\nuvm2       1105.7       1424.3     318.6    >18.80\nuvm2      28051.2      28842.6     791.4    >21.25\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.197 in the direction of the burst (Schlegel et al. 1998).",
  "circularId": 43318,
  "bibcode": "2026GCN.43318....1K",
  "submitter": "noelklin@umbc.edu",
  "format": "text/plain",
  "subject": "GRB 260101A: Swift/UVOT Detection",
  "eventId": "GRB 260101A"
}