GCN Circular 36575

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
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; Kumar et al. GCN 36559
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; Joshi et al. GCN 36560
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; Fu et al. GCN 36561
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; Shilling et al. GCN 36562
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; Perez-Garcia et al. GCN 36563
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; Dutton et al. GCN 36568
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; Mo et al. GCN 36569
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; Odeh et al. GCN 36573
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; de Ugarte Postigo et al. GCN 36574
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) 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
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).

We acknowledge the excellent support from Observatoire de Haute-Provence and in particular S. Favard for the MISTRAL observations and A. Radcliffe.