TITLE:   GCN CIRCULAR
NUMBER:  29515
SUBJECT: GRB 210211A: ePESSTO+ NTT optical observations
DATE:    21/02/16 18:08:56 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <pda.davanzo@gmail.com>

L. Harvey, M. Magee (TCD), P. D'Avanzo (INAF-OAB), D. B. Malesani (DTU Space), S. Prentice, M. Deckers (TCD), S. Schulze (OKC), J. Teffs (LJMU), 
S. Gonzalez-Gaitan (CENTRA), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), 
E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), report:


We observed the field of GRB 210211A (Fermi GBM Team, GCN Circ. 29470; Troja et al., GCN Circ. 29472) under the advanced extended Public ESO 
Spectroscopic Survey for Transient Objects (ePESSTO+; see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org <http://www.pessto.org/> ). The observations were performed 
on the ESO New Technology Telescope at La Silla with the EFOSC2 instrument in imaging mode on 2021-02-16 between 08:01:05 UT and 08:42:23 UT 
(i.e. about 4.99 days from the burst). The observations were carried out with the R filter under a seeing of about 1.9". 

The optical afterglow (D'Avanzo et al., GCN Circ. 29474; Lipunov et al. GCN Circ. 29477; Kuin et al., GCN Circ. 29485) is not detected down to a 3sigma 
limiting magnitude of R ~ 24.3 (Vega; based on preliminary photometry calibrated against the USNO B1 catalogue).