TITLE: GCN CIRCULAR NUMBER: 40320 SUBJECT: GRB 250502A: SVOM/VT optical bump DATE: 25/05/02 12:21:30 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> H. L. Li, L. P. Xin, Y. L. Qiu, C. Wu, Z. H. Yao, X. H. Han, Y. Xu, J. Wang, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA), Y. Wang (PMO), R.Z. Li (YNAO), J.X. Cao (GXU), D.F. Kong (GXU) report on behalf of the SVOM/VT Instrument Center: GRB 250502A (sb25050205) (Wang et al., GCN 40313) was observed by on-board SVOM/VT after the automatic slew of the satellite. The VT conducted observations in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously. With the downlinked X-band data, the optical counterpart (Rakotondrainibe et al., GCN 40315; An et al., GCN 40319) was observed with single exposure of 50 seconds in both VT_B and VT_R bands. The earliest observation started on 2025-05-02T08:51:36 UT (i.e. 334 seconds after the burst). The light curve shows a brightening with a peak brightness of 17.02+/-0.01 mag in VT_R and 17.86+/-0.02 mag at 584 seconds after the burst. The photometry is in the AB system and is not corrected for Galactic extinction. Given the color of VT_B-VT_R~0.8 mag, it might be a low or intermediate redshift GRB. Observation is ongoing. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC),CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/40320. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...