{
  "bibcode": "2020GCN.29165....1R",
  "body": "I observed the field of GRB 201223A (Gropp et al., GCN Circ. 29158)\nwith remote telescope T18 (0.32-m f/8.0 reflector + CCD) of\niTelescope.Net in observatory AstroCamp at Nerpio (Spain) on\n2020-12-23 since 19:49:22 UT (1 hour 50 minutes 56 seconds after the\ntrigger). 5 images (with exposures 300, 120 and 180 seconds) were\nobtained with Astrodon luminance filter and 4 images (exposures: 300\nand 60 seconds) with photometric Johnson V filter. I detected the\noptical afterglow in images with position: RA 08:51:09.46 Dec\n+71:10:47.00. It is not present in the Pan-STARRS images.\n\nThe following magnitudes were measured from comparison to r magnitudes\nof nearby stars from Pan-STARRS DR1 catalogue (Chambers et al., 2016):\n\nTime of start (UT)  Exp.time (s.)  Bin.  Mag. r   Mag. error    Filter\n---------------------------------------------------------------------------\n19:49:22            300            1     19.2     0.2           Luminance\n19:56:25            300            1     19.3     0.4           V\n20:26:25            300            2     19.9     0.4           V\n20:33:07            300            2     20.1     0.3           Luminance\n---------------------------------------------------------------------------\n\nMagnitudes were not corrected for Galactic extinction.\n\nStacked image (4x300 + 2x120 + 180 sec.) available here:\nhttps://www.flickr.com/photos/filipp-romanov/50753199496",
  "circularId": 29165,
  "createdOn": 1608778184000,
  "email": "filipp.romanov.27.04.1997@gmail.com",
  "subject": "GRB 201223A: iTelescope optical afterglow observations",
  "submitter": "Filipp Dmitrievich Romanov at Amateur astronomer  <filipp.romanov.27.04.1997@gmail.com>",
  "eventId": "GRB 201223A"
}