{
  "submitter": "Benjamin Schneider at MIT <bschn@mit.edu>",
  "eventId": "GRB 240411B",
  "circularId": 36067,
  "submittedHow": "web",
  "body": "B. Schneider (MIT), C. Adami (LAM/Pytheas/AMU), E. Le Floc’h (CEA Paris-Saclay), A. Saccardi (GEPI/Obs. de Paris) report on behalf of a larger collaboration:\n\nWe observed the field of the GRB 240411B (Parsotan et al., GCN 36063; Goad et al., GCN 36065) and its afterglow candidate (Izzo et al., GCN 36064) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. A total of 10 exposures (8x600s + 2x720s) were obtained in the r-band at 00:44:01.5 UT on 2024-04-12 (~9.2h after the trigger). In the combined frame, we detect a source consistent with the optical afterglow reported by Izzo et al. (GCN 36064).\n\nThe preliminary magnitude derived for that source is\n\nr = 23.1 +/- 0.3 mag (AB)\n\nThe photometric calibration was performed using nearby stars from the PanSTARRS catalog and the magnitude is not corrected for Galactic extinction.\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence and in particular Jean-Pierre Troncin for the MISTRAL observations.\n",
  "createdOn": 1712900320253,
  "bibcode": "2024GCN.36067....1S",
  "subject": "GRB 240411B: OHP/T193 optical observations"
}