{
  "bibcode": "2021GCN.29808....1P",
  "body": "P. Pessi (ESO), G. Csoernyei, A. Holas, S. Taubenberger, C. Vogl (MPA \nGarching), A. Floers (GSI), G. Pignata (UNAB), J. Teffs (Liverpool), M. \nDennefeld (IAP), D. B. Malesani (DTU Space), P. D'Avanzo (INAF/Brera), \nJ. Anderson (ESO), T. M��ller Bravo (Southampton), T.-W. Chen \n(Stockholm), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare \n(Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), D. Young (QUB), \nE. Zimmerman (Weizmann) report:\n\nWe observed the optical afterglow of GRB 210411C (Sbarrato et al., GCN \n29794; Strausbaugh & Cucchiara, GCN 29802; de Ugarte Postigo et al., GCN \n29806) under the the advanced Public ESO Spectroscopic Survey for \nTransient Objects (ePESSTO+; see Smartt et al. 2015, A&A, 579, 40 and \nhttp://www.pessto.org ). The observations were performed on the ESO New \nTechnology Telescope (NTT) at La Silla with the EFOSC2 instrument. A \nsingle 5-min exposure was acquired in the Gunn r filter, with mean epoch \n2021 Apr 12.234 UT (14.55 hr after the GRB).\n\nThe optical afterglow is well detected and we report the following \ncoordinates (calibrated against the Gaia catalog):\n\nRA = 19:46:26.83\nDec = -39:23:52.7\n\nFor the afterglow, we measure a magnitude R = 21.28 +- 0.04 (Vega), \nassuming R = 17.31 for the USNO star at RA = 19:46:25.68, Dec = \n-39:23:48.9 . An extra uncertainty of ~0.3 mag should be added to \naccount for the photometric calibration error of the USNO catalog.",
  "circularId": 29808,
  "createdOn": 1618258941000,
  "email": "malesani@space.dtu.dk",
  "subject": "GRB 210411C: ePESSTO+ NTT optical observations",
  "submitter": "Daniele B Malesani at DTU Space  <malesani@space.dtu.dk>",
  "eventId": "GRB 210411C"
}