{
  "createdOn": 1734651856043,
  "body": "J. Freeburn (Swinburne/OzGrav), I. Andreoni (UNC), J. Carney (UNC)\n\nWe observed the optical counterpart (Qiu et al., GCN 38600) to SVOM GRB 241217A / EP241217b (Brunet et al., GCN 38594; William et al., GCN 38599; Zhou et al., GCN 38606), with the Goodman High Throughput Spectrograph mounted on the SOAR telescope in imaging mode. We took six 300s exposures in r-band between 2024-12-19T04:23:12 and 2024-12-19T04:54:57 UTC.\n\nWe detect the optical counterpart associated with GRB 241217A / EP241217b.  With difference imaging using a template from the Dark Energy Survey (Abbott et al., 2021, ApJ, 255, 20) and photometric calibration using the Pan-STARRS1 catalogue, we measure r = 24.28 +/- 0.26 AB magnitude.\n\nWhile this is a low significance result, our measurement agrees with the photometry reported in Schneider et al. (GCN 38637).  Measuring from the science and template images respectively, we obtain 23.41 +/- 0.14 and 24.49 +/- 0.18 AB magnitude respectively.  These measurements are consistent with the results of GCN 38637 and the Legacy Survey catalog measurement.",
  "circularId": 38642,
  "bibcode": "2024GCN.38642....1F",
  "submitter": "James Freeburn at Swinburne University of Technology <jamesfreeburn54@gmail.com>",
  "eventId": "GRB 241217A",
  "submittedHow": "web",
  "format": "text/plain",
  "subject": "GRB 241217A/EP241217b: SOAR afterglow detection"
}