TITLE: GCN CIRCULAR NUMBER: 45323 SUBJECT: GRB0808B: OHP/T193 optical observations DATE: 26/08/09 03:41:48 GMT FROM: Christophe Adami at LAM <christophe.adami@lam.fr> C. Adami (LAM/Pytheas/AMU), E. Le Floc'h (CEA/Irfu), B. Schneider (LAM), A. Saccardi (CEA/Irfu), S. Basa (LAM/OHP/Pytheas/AMU) report on behalf of a larger collaboration: We observed the field of GRB 260808B (Bouchet et al., GCN45316; see also Wang et al., GCN45322) using the T193cm telescope at Observatoire de Haute-Provence (France) with the MISTRAL spectro-imager. We obtained 7x10 + 1x5 minutes of exposure in the i-band and 6x20minutes in the Y-band under a 2.3arcsec seeing, starting at 20260808_223518UT (~8.3 hr after the Bouchet et al. trigger) and ending at 20260809_021419UT (~11.9 hr after the Bouchet et al. trigger). In the preliminary stacked images, we detect in i’ band the afterglow at the position of Turpin et al. (GCN 45318) and Li et al. (GCN 45320) at a preliminar magnitude of: i = 22.63 +/- 0.13 mag We do not detect the source in our Y-band image. This image has a preliminar estimated limiting magnitude of Y=21.8 (3sigma). The photometric calibration was performed using nearby stars from the PanSTARRS catalog and the STDWeb/STDPipe tools (Karpov 2025), is in the AB system, and is not corrected for Galactic extinction. We acknowledge the excellent support from Observatoire de Haute-Provence and in particular Stephane Favard. View this GCN Circular online at https://gcn.nasa.gov/circulars/45323. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...