TITLE:   GCN CIRCULAR
NUMBER:  31242
SUBJECT: GRB 211211A: TNG NIR observations
DATE:    21/12/16 12:40:41 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <pda.davanzo@gmail.com>

P. D'Avanzo (INAF-OAB), A. Rossi (INAF-OAS), D. B. Malesani (Radboud), V. D'Elia (ASI-SSDC), A. Melandri (INAF-OAB), 
M. De Pasquale (Univ. Messina), S. Piranomonte (INAF-OAR), G. Andreuzzi, A. Garcia de Gurtubai (INAF-TNG) 
on behalf of the CIBO collaboration report:

We observed the field of GRB 211211A (D’Ai et al., GCN Circ. 31202) with the Italian 3.6m TNG telescope equipped with the 
near-infrared camera NICS. A series of images were obtained with the H filter on 2021-12-16 from 05:51:36 UT to 07:00:51 UT 
(i.e. at a mid time of about 4.7 days after the burst). 

No source is detected at the optical and NIR counterpart position (Zheng & Filippenko, GCN Circ. 31203; Levan et al., GCN Circ. 
31235) down to the following 3sigma upper limit:

H > 20.5 (Vega) or H > 21.9 (AB) 

(calibrated against the 2MASS catalogue).