TITLE: GCN CIRCULAR NUMBER: 42225 SUBJECT: GRB 251013C: BOOTES-6 early optical detection DATE: 25/10/13 19:07:16 GMT FROM: I. Perez-Garcia at Institute of Astrophysics of Andalusia ipg@iaa.es
I. Perez-Garcia, S.-Y. Wu, E. Fernandez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martin-Carrillo and L. Hanlon (UCD, Ireland), M. Gritsevich (Univ. of Helsinki) and C. J. Perez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report:
Following the detection of GRB 251013C by SVOM (Rakotondrainibe et al., GCN 42222), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) responded to this high-energy event starting on Oct 13, 17:42:32 UT (i.e., 170 sec after detection). Series of images in clear filter were gathered and we detect an optical source consistent with the one reported by Palmerio et al. (GCN 42223). Using GaiaDR3 Gmag as reference we report our photometry analysis:
| UT mid exposure | mag | error | filter | exposure time (sec) | | ------------------- | ----- | ----- | ------ | ------------------- | | 2025-10-13 17:43:02 | 14.42 | 0.02 | clear | 60 | | 2025-10-13 17:44:31 | 14.82 | 0.02 | clear | 60 | | 2025-10-13 17:50:23 | 14.79 | 0.03 | clear | 60 | | 2025-10-13 17:51:52 | 15.03 | 0.02 | clear | 60 | | 2025-10-13 17:57:44 | 15.77 | 0.03 | clear | 60 | | 2025-10-13 17:59:13 | 15.79 | 0.03 | clear | 60 | | 2025-10-13 18:05:04 | 16.07 | 0.03 | clear | 60 |
Further analysis of the additional images is ongoing.
We thank the staff at Boyden Observatory for their excellent support.
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