GCN Circular 36655

A. Rossi, E. Maiorano (INAF-OAS), A. Melandri (INAF-OAR), D. B. Malesani (DAWN/NBI and Radboud), L. Izzo (INAF-OACn & DARK/NBI) and M . De Pasquale (Univ. of Messina) report on behalf of the CIBO collaboration:

We observed the field of GRB 240529A  (Eyles-Ferris et al., GCN 36556
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; Joshi et al., GCN 36560
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; Tan et al., GCN 36578
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; Kozyrev et al., GCN 36583
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  et al. GCN 36583
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;  Svinkin et al., GCN 36584
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) with the LBC camera mounted on LBT (Mt Graham, AZ, USA) in u'g'r'i'z' bands approximately at midtime 9:55 UT on 2024-06-05 and 7.3 days after the burst trigger.

The optical transient (Kumar et al. GCN 36559
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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. GCNs 36573
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, 36592
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; de Ugarte Postigo et al. GCN 36574
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; Adami et al. GCN 36575
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; Mohan et al. GCN 36576
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; Vinko et al. GCN 36577
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;  Lim et al. GCN 36579
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; Moskvitin et al. GCNs 36582
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, 36597
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, 36601
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 ; Pankov et al. GCN 36585
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; Ror et al., 36589; Hu et al. GCN 36599
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; Lipunov et al. GCN 36603
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) is well detected in r’i’z’  bands. The good seeing (0.8") allows us to detect the afterglow and separate it from a brighter star which is only 1 arcsec away and visible also in PanSTARRS archival images. Using PSF photometry, we measure a preliminary AB magnitude of r'=23.9+-0.1, calibrated against PanSTARRS field stars, and not corrected for the foreground Galactic extinction.

This detection together with the early photometry reported in the GCNs (selected between 5 and 30 hours after the trigger to be less contaminated by the near-by bright-star) are well fitted by a power-law decay with index -1.9, in agreement with the Swift/XRT late-time decay behavior.

We acknowledge the excellent support from the LBTO and LBT-INAF staff, particularly J. Rupert, S. Allanson, F. Cusano, E. Marini, D. Paris, and E. O. Kishka in obtaining these observations.