TITLE: GCN CIRCULAR NUMBER: 43268 SUBJECT: EP251229a: BOOTES-2 early optical upper limit DATE: 25/12/30 12:07:44 GMT FROM: I. Perez-Garcia at Institute of Astrophysics of Andalusia <ipg@iaa.es> I. Perez-Garcia, M.D. Caballero-Garcia, E. J. Fernandez-Garcia, R. Sanchez-Ramirez, S.-Y. Wu, S. Guziy, and A. J. Castro-Tirado (IAA-CSIC, Granada), Y.-D. Hu (GXU), C. Perez del Pulgar and A. Reina (Univ. of Malaga), M. Gritsevich (Univ. of Helsinki), R. Fernandez-Munoz (IHSM/UMA-CSIC), D. R. Xiong (Yunnan Observatories of CAS), and M. Jelinek (ASU-CAS, Ondrejov Obs.), on behalf of a larger collaboration, report: Following the detection of the X-ray transient EP251229a by Einstein Probe (Wang et al. GCN 43253), the 0.6m BOOTES-2/TELMA robotic telescope at IHSM UMA “La Mayora” (Malaga, Spain) automatically responded to this high-energy event starting on Dec 29, 20:11:10 UT (i.e. 12 min after detection). On a coadd image (14 x 60sec) at 20:50:40 UT (mid exposure time; i.e. 51 min after detection), nothing is detected down to 19.3 mag (clear filter) within the FXT error region (Wang et al. GCN 43264), in agreement with the deeper observations taken later on (Martin-Carrillo et al. GCN 43266). We would like to thank the staff at IHSM-/UMA-CSIC “La Mayora” for their excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/43268. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...