TITLE: GCN CIRCULAR NUMBER: 42153 SUBJECT: GRB 251005C: PRIME J-band upper limit DATE: 25/10/07 23:04:57 GMT FROM: N. Passaleva at Sapienza University of Rome <niccolo.passaleva@uniroma1.it> M. El Kabir (U Rome), O. Guiffreda (UMD), N. Passaleva (U Rome), J. Durbak (UMD), E. Troja (U Rome), A. S. Kutyrev (NASA/GSFC), S. B. Cenko (NASA/GSFC) Following the Swift/BAT detection and Swift/XRT localization of an uncatalogued source (Page et al, GCN 42113), we observed the transient field in J filter with PRIME ~32.9 hours after the initial BAT trigger. Using Two Micron All Sky Survey (2MASS) for preliminary calibration we do not detect any uncatalogued source down to J>20.2 AB (3-sigma) not corrected for galactic extinction at the position of the candidates reported by Swift/XRT (Goad et al. GCN 42116), and SVOM/VT (Palmerio et al., GCN 42123). PRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa at the South African Astronomical Observatory (SAAO) (Kutyrev et al. 2023, Yama et al. 2023, Durbak et al. 2024). We thank the Osaka University observers at PRIME and the staff at SAAO for their support with these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/42153. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...