{
  "body": "C. Adami (LAM/Pytheas/AMU), B. Schneider (LAM), A. de Ugarte Postigo (LAM), Y. Degot-Longui (Pytheas/OHP), J. Balcaen (Pytheas/OHP), S. Basa (LAM/OHP/Pytheas/AMU), E. Le Floc'h (CEA/Irfu), report on behalf of a larger collaboration:\n\nWe re-observed the field of the GRB 250610B (Saccardi et al., GCN 40671; Wang et al., GCN 40672; Gompertz et al., GCN 40674; Schneider et al., GCN 40676; Gompertz et al., GCN 40677; Li et al., GCN 40678; Evans et al., GCN 40679; Liang et al., GCN 40681; Wang et al., GCN 40682; Wang et al., GCN 40683;  Bochenek et al., GCN 40684; Qiu  et al., GCN 40685; Brivio et al., GCN 40687; Schneider et al., GCN 40689; Breeveld et al., GCN 40691; Hamburg et al., GCN 40692; Godet al., GCN 40695) using the T120cm and T193cm (MISTRAL instrument) telescopes at Observatoire de Haute-Provence (France). We obtained 60 minutes with MISTRAL and 75 minutes with the T120 CCD camera simultaneously in the r-band, from 2025-06-11 at 20:41 to 22:17 UTC (from 28.13 to 29.73 hr after the trigger).\n\nIn the stacked and combined image from both instruments, the optical counterpart is detected at a preliminary magnitude of:\n\nr = 22.59 +/- 0.21 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 the students and professors from the summer camp OHP 2025 and the SOPHIE observer T. Llopis\n\n\n",
  "submittedHow": "web",
  "format": "text/plain",
  "subject": "GRB 250610B: MISTRAL/T193 and T120 OHP further observations",
  "createdOn": 1749729470909,
  "bibcode": "2025GCN.40698....1A",
  "circularId": 40698,
  "eventId": "GRB 250610B",
  "submitter": "Christophe Adami at LAM <christophe.adami@lam.fr>"
}