TITLE:   GCN CIRCULAR
NUMBER:  45975
SUBJECT: GRB261010A: Retraction of Keck/MOSFIRE near-IR source
DATE:    26/10/17 18:13:42 GMT
FROM:    Jillian Rastinejad at University of Maryland <jillianrastinejad2024@u.northwestern.edu>

Jillian Rastinejad (UMD), Maggie Li, Mansi Kasliwal (Caltech), and Charles D. Kilpatrick (Northwestern) report on behalf of a larger collaboration:

We have re-reduced our Keck/MOSFIRE J-band observation (Rastinejad et al. GCN 45957) of GRB 261010A (Fermi GBM Team, GCN 45888; Lien et al., GCN 45889, Frederiks et al. GCN 45925). In our updated stacked image, the reported near-IR source is no longer detected at >3-sigma significance. We therefore refine our conclusion from the Keck/MOSFIRE imaging at 5.4 days post-burst (Rastinejad et al. GCN 45957) to place a 3-sigma upper limit on emission at the position of the optical afterglow (O’Neill et al., GCN 45890) of J > 23.5 AB mag. This upper limit may be improved with ongoing data reduction.