TITLE: GCN CIRCULAR NUMBER: 36575 SUBJECT: GRB 240529A: T193/MISTRAL observations DATE: 24/05/30 13:23:17 GMT FROM: Antonio de Ugarte Postigo at OCA deugarte@oca.eu
C. Adami, S. Basa (LAM/Pytheas/AMU), A. de Ugarte Postigo (CNRS, OCA/LAM), E. Le Floc'h (CEA Paris-Saclay), J. Palmerio (GEPI, Obs. de Paris), F. Schussler (CEA Paris-Saclay) report:
We performed imaging of the field of GRB 240529A (Eyles-Ferris et al. GCN 36556; Kumar et al. GCN 36559; Joshi et al. GCN 36560; Fu et al. GCN 36561; Shilling et al. GCN 36562; Perez-Garcia et al. GCN 36563; Dutton et al. GCN 36568; Mo et al. GCN 36569; Odeh et al. GCN 36573; de Ugarte Postigo et al. GCN 36574) with MISTRAL mounted on the 1.93 m telescope at Observatoire du Haut Provence (OHP, France). The observations consisted of 2 sets of 10x60s exposures in r-band under poor weather conditions, through passing clouds. Using a stack of the 6 only useable frames, we detect the afterglow close to the detection limit. Using as reference field stars from the Pan-STARRS catalogue, we determine a brightness of r(AB) = 19.8 +/- 0.3 mag at a mean date of 2024-05-30T01:52:00 UT, 0.9542 days after the burst. We note that this is slightly fainter but consistent with the value measured by GTC 1.75 hrs later (de Ugarte Postigo et al. GCN 36574).
We acknowledge the excellent support from Observatoire de Haute-Provence and in particular S. Favard for the MISTRAL observations and A. Radcliffe.
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