{
  "subject": "GRB 250219A: OHP/T193 optical upper limit",
  "body": "C. Adami (LAM/Pytheas/AMU), B. Schneider (LAM), M. Dennefeld (IAP/CNRS/Sorbonne U.), J. P. Palmerio \n(CEA/Irfu), E. Le Floc'h (CEA/Irfu), D. Turpin (CEA/Irfu), S. Basa (UAR Pytheas) report on behalf of a \nlarger collaboration:\n\nWe observed the field of the GRB 250219A (Daigne et al., GCN 39376) using the T193cm telescope at \nObservatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. We obtained 7 \nexposures (1x360s, 1x720s and 5x600s) in the r-band starting at 01:11:32 UT on 2025-02-20 (9.3h after \nthe trigger).\n\nIn the stacked image, we do not detect any new source at the XRT source #1 position (Evans et al., GCN \n39377) down to the following 3-sigma limit:\n\nr > 22.68 mag AB\n\nThis value is consistent with previously reported detections or upper limits on the optical afterglow \n(Xin et al., GCN 39380; Lagioia et al., GCN 39381; Magnani et al., GCN 39382; Fu et al., GCN 39383).\n\nThe photometric calibration was performed using nearby stars from the PanSTARRS catalog and the \nmagnitude is not corrected for Galactic extinction.\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence and in particular Stephane \nFavard, Yasmine Davis and Alix Freckelton for the MISTRAL observations.\n",
  "circularId": 39384,
  "eventId": "GRB 250219A",
  "submittedHow": "web",
  "createdOn": 1740048549305,
  "format": "text/plain",
  "bibcode": "2025GCN.39384....1A",
  "submitter": "Christophe Adami at LAM <christophe.adami@lam.fr>"
}