{
  "subject": "GRB240809A: Liverpool Telescope optical follow-up observations",
  "bibcode": "2024GCN.37134....1B",
  "createdOn": 1723325366326,
  "submittedHow": "web",
  "submitter": "A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>",
  "circularId": 37134,
  "body": "A. Bochenek and D. A. Perley (LJMU) report:\n\nWe observed the Gamma-Ray Burst GRB240809A (Evans et al. GCN 37110 ; Want et al. GCN37113) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 5x120s exposures with the SDSS-R and SDSS-I filters starting at 2024-08-09 21:48:46 UT, approximately 13.3 hours after the trigger.\n\nThe afterglow is detected in every exposure at a position consistent with previous detections reported by Dubay et al. (GCN 37114) and Jiang et al. (GCN 37116). The obtained results are given below:\n\nMJD (mid)          T_mid - T_0       Filter      Mag. (AB)\n60531.91279        13.40 h             r          20.54 ± 0.05\n60531.18419        13.60 h             i          20.43 ± 0.05\n\n\nThe photometry was obtained using nearby PanSTARRS secondary standards and was not corrected for extinction.\n",
  "format": "text/plain",
  "eventId": "GRB 240809A"
}