TITLE: GCN CIRCULAR NUMBER: 36680 SUBJECT: GRB 240615A: FLWO-1.2m optical upper limits DATE: 24/06/17 02:24:03 GMT FROM: Harsh Kumar at Center for Astrophysics | Harvard & Smithsonian <harshkosli13@gmail.com> H. Kumar (CFA) D. Hiramatsu (CFA), and E. Berger (CFA) report on behalf of the FLWO team: We observed GRB 240615A detected by Fermi GBM (GCN #36671)and Swift/BAT-GUANO (GCN #36672), with the FLWO 1.2m (48”) robotic telescope. We obtained multiple 300-sec exposures in the g, r, and i filters and did not detect any new source in our stacked images within 4 arcmin of BAT position: RA (J2000) = 21:44:33.91, Dec(J2000) = 38:35:41.3. We obtained the following upper limits: --------------------------------------------------------------------------------- JD (mid) | T-T0(hrs) | Exposure (sec) | Filter | Lim_mag (5-sigma) --------------------------------------------------------------------------------- 2460477.78778 | 13.04 | 900 (stacked) | r | > 21.92 2460477.79915 | 13.32 | 900 (stacked) | g | > 21.33 2460477.81047 | 13.59 | 900 (stacked) | i | > 21.47 --------------------------------------------------------------------------------- The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. We thank the FLWO staff for their support. View this GCN Circular online at https://gcn.nasa.gov/circulars/36680. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...