{
  "bibcode": "2021GCN.30564....1D",
  "body": "F. De Luise, F. Onori (INAF-OAAb), R. Carini, S Piranomonte (INAF-OAR), A.\nMelandri (INAF-OAB), M. Canzari, M. Dolci, G. Valentini, A. Di Cianno, A.\nValentini, N. Napoleone, P. Tedesco (INAF-OAAb), E. Brocato (INAF-OAAb and\nOAR) on behalf of the GRAWITA collaboration report:\n\nOn 2021-07-30 we observed the field of GRB210730A (Sonbas et al., GCN Circ.\n30548; Prasad et al., GCN Circ. 30555; Wood et al., GCN Circ. 30577) with\nthe 0.9m Schmidt Telescope of the INAF - Astronomical Observatory of\nAbruzzo located at 2150 meters a.s.l. at Campo Imperatore (Italy) and\nequipped with a 4096x4096 CCD, covering a field of view of 1.15��1.15 square\ndegrees.\n\nA series of optical images of the field have been obtained with the r-Sloan\nand z-Sloan filters on 2021-07-30. The observation started at 19:50:29 UT\n(about 15 hr after the burst) for a total exposure time of 26x180s in r\nband and 15x180s in z band, respectively.\nA preliminary analysis does not show any optical counterpart candidate\nwithin the XRT error circle (https://www.swift.ac.uk/xrt_positions/01062150/\n).",
  "circularId": 30564,
  "createdOn": 1627740808000,
  "email": "fiore.deluise@inaf.it",
  "subject": "GRB 210730A: Campo Imperatore optical observations",
  "submitter": "Fiore De Luise at INAF-Osservatorio Astro. d'Abruzzo  <fiore.deluise@inaf.it>",
  "eventId": "GRB 210730A"
}