TITLE: GCN CIRCULAR NUMBER: 38598 SUBJECT: GRB 241217A: LCO optical upper limit DATE: 24/12/17 21:41:05 GMT FROM: Damien Turpin at CEA-Saclay dturpin-astro@hotmail.com
D. Turpin, J. T. Palmerio (CEA/Irfu), S. Vergani (GEPI/Obs. de Paris), A. Saccardi (CEA/Irfu), S. Basa (UAR Pytheas, OHP, LAM), E. Le Floc'h (CEA Paris-Saclay, DAp/AIM), L.-P Xin (NAOC) on behalf of a larger collaboration.
We observed the field of GRB 241217A detected by SVOM (Brunet et al., GCN 38594) with the LCO 1.0m telescope at the Sutherland Observatory (SAAO) equipped with the Sinistro instrument. Our observation started at 2024-12-17 19:17:34.013 UTC (T - TGRB ~ 2.3 h) with 4 x 180s exposure using the sdss-r filter. Despite good weather conditions, we note a slightly loss of telescope tracking during our single exposures which reduced a bit our image quality.
We did not detect any uncatalogued optical source inside the refined SVOM/MXT afterglow candidate position (Brunet et al., GCN 37594). In our first image, we derived the preliminary following upper limit (3 sigma, AB system) calibrated with the PanSTARRS DR1 catalog and not corrected from the galactic extinction E(B-V): 0.03:
Tmid-T0 | mag (AB) | filter | ------------------------------ 2.36h |21.6 (U.L.)| sdssr |
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 101004719
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