TITLE: GCN CIRCULAR NUMBER: 32804 SUBJECT: GRB 221009A: TNG NIR detection DATE: 22/10/19 16:28:04 GMT FROM: Paolo D'Avanzo at INAF-OAB pda.davanzo@gmail.com
M. Ferro, R. Brivio, P. D’Avanzo (INAF-OAB), S. Piranomonte (INAF-OAR), V. Lorenzi, G. Mainella (INAF-TNG), on behalf of the CIBO collaboration report:
We observed the field of GRB 221009A (Dichiara et al., GCN 32632; Kennea & Williams, GCN 32635; Veres et al., GCN 32636; Bissaldi et al., GCN 32637; Svinkin et al., GCN 32641; Ursi et al., GCN Circ. 32650) with the Italian 3.6m TNG telescope equipped with the near-infrared camera NICS. A series of images were obtained with the J, H and K filters on 2022-01-16 at a mid time of about 7.3 days after the GBM trigger time.
The NIR afterglow (Brivio et al., GCN Circ. 32652) is clearly detected in all bands. From preliminary photometry we derive the following magnitude:
H = 16.45 +/- 0.04
(Vega; calibrated against the 2MASS catalogue).
We acknowledge the TNG visiting astronomers B. Lakeland and B. Nicholson for their support.