TITLE: GCN CIRCULAR NUMBER: 35384 SUBJECT: GRB 231216A: R-band observations from T120 at Observatoire de Haute-Provence DATE: 23/12/16 23:40:34 GMT FROM: Christophe Adami at LAM <christophe.adami@lam.fr> S. Basa (OHP/Pythéas/LAM), C. Adami (Pythéas/LAM), Y. Degot-Longhi (OHP/Pythéas), A. Saccardi (GEPI, Obs. de Paris), D. Adrien, E. Le Floc'h, F. Schüssler, D. Turpin (CEA Paris-Saclay), report on behalf of a larger collaboration: We observed the field of GRB231216A (GCN 35378; Sbarrato et al.) using the T120cm camera at Observatoire de Haute-Provence (France). We began our observations on 2023 16 December 21:37:24 UT (~3h after the trigger time) with a series of R-band (10x300s) images. Last image was taken at 22:37:51 UT. Consistently with Lipunov et al. (GCN 35379), Hu et al. (GCN 35381), Malesani et al. (GCN 35382), and Sharma et al. (GCN 35383), we did not detect any credible optical counterpart to GRB231216A within the GCN 35378 Swift XRT error box. Using the r-band PanStarr public image, the faintest detected object in our R-band image with a measured PanStarr magnitude is at rMeanPSFMag=22.2. We acknowledge the excellent support from Observatoire de Haute-Provence, in particular Jean Balcaen. View this GCN Circular online at https://gcn.nasa.gov/circulars/35384. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...