GCN Circular 29808
Subject
GRB 210411C: ePESSTO+ NTT optical observations
Date
2021-04-12T20:22:21Z (3 years ago)
From
Daniele B Malesani at DTU Space <malesani@space.dtu.dk>
P. Pessi (ESO), G. Csoernyei, A. Holas, S. Taubenberger, C. Vogl (MPA
Garching), A. Floers (GSI), G. Pignata (UNAB), J. Teffs (Liverpool), M.
Dennefeld (IAP), D. B. Malesani (DTU Space), P. D'Avanzo (INAF/Brera),
J. Anderson (ESO), T. M��ller Bravo (Southampton), T.-W. Chen
(Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare
(Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB),
E. Zimmerman (Weizmann) report:
We observed the optical afterglow of GRB 210411C (Sbarrato et al., GCN
29794; Strausbaugh & Cucchiara, GCN 29802; de Ugarte Postigo et al., GCN
29806) under the the advanced Public ESO Spectroscopic Survey for
Transient Objects (ePESSTO+; see Smartt et al. 2015, A&A, 579, 40 and
http://www.pessto.org ). The observations were performed on the ESO New
Technology Telescope (NTT) at La Silla with the EFOSC2 instrument. A
single 5-min exposure was acquired in the Gunn r filter, with mean epoch
2021 Apr 12.234 UT (14.55 hr after the GRB).
The optical afterglow is well detected and we report the following
coordinates (calibrated against the Gaia catalog):
RA = 19:46:26.83
Dec = -39:23:52.7
For the afterglow, we measure a magnitude R = 21.28 +- 0.04 (Vega),
assuming R = 17.31 for the USNO star at RA = 19:46:25.68, Dec =
-39:23:48.9 . An extra uncertainty of ~0.3 mag should be added to
account for the photometric calibration error of the USNO catalog.