{
  "bibcode": "2022GCN.32679....1R",
  "body": "I observed the optical afterglow of the extremely bright GRB 221009A =\nSwift J1913.1+1946 (Dichiara et al., GCN Circ. 32632) remotely using\ntelescope T24 (0.61-m f/6.5 reflector + CCD) of iTelescope.Net in\nSierra Remote Observatory (Auberry, California, USA) on 2022-10-11.\n\nTwo images (exposures 300 seconds, BINx1) were obtained with Ic\nfilter, midtime of the stacked image is 06:12:42 UT (1d16h02m after\nthe trigger).\n\nI clearly detected the afterglow and measured (aperture photometry,\nwithout deblending) following magnitude: 17.1 Ic +/- 0.2 from\ncomparison to transformed (from Lupton 2005) magnitudes of nearby\nstars from the Pan-STARRS DR1 catalogue (Chambers et al., 2016).\n\nMagnitude was not corrected for the Galactic extinction.\n\nStacked image available here:\nhttps://www.flickr.com/photos/filipp-romanov/52419866941\n\nF. D. Romanov (AAVSO member, observer code: RFDA).",
  "circularId": 32679,
  "createdOn": 1665482615000,
  "email": "filipp.romanov.27.04.1997@gmail.com",
  "subject": "GRB 221009A (Swift J1913.1+1946): iTelescope optical observation",
  "submitter": "Filipp Dmitrievich Romanov at Amateur astronomer  <filipp.romanov.27.04.1997@gmail.com>",
  "eventId": "GRB 221009A"
}