{
  "bibcode": "2020GCN.27764....1K",
  "body": "A. Kumar (ARIES), S. B. Pandey (ARIES), K. Chand (ARIES), A. Aryan (ARIES),\nR. Gupta (ARIES), A. Ghosh (ARIES), Dimple (ARIES), and K. Misra (ARIES)\nreport:\n\nWe observed the optical afterglow of the Swift detected GRB 200519A (GCN\n27756, GCN 27761 and GCN 27763) with the 1.3m Devsthal Fast Optical\nTelescope (DFOT) at\nAryabhatta Research Institute of Observational Sciences (ARIES), Nainital\n(India), from 2020-05-19T19:17:27 to 2020-05-19T22:01:38 UTC.\nWe observed 11 frames each of 300 seconds in Bessell R filter, whereas, a\nserious of 7x300 seconds exposure in Bessell I filter.\nIn the stacked images, we clearly detected the optical afterglow of GRB\n200519A in both Bessell R and I filters within the Swift XRT enhanced error\ncircle (Osborne et al. GCN 27761).\nThe estimated magnitudes are consistent with optical detections by Kong et\nal. GCN 27757, Strausbaugh et al. GCN 27759, and Hu et al. 27760.\n\n\nThe observed magnitudes are as follows:\n\nT_start-T0 (hours)   Start Date (UTC)              Filter\n Magnitudes (mag)\n---------------------------------------------------------------------------------------------------------------\n7.95               2020-05-19T19:17:27                 R               19.4\n+- 0.1\n9.98               2020-05-19T21:19:27                 I\n18.2 +- 0.1\n\n\nPhotometry is done based on the USNO-B1.0 catalog. The quoted magnitudes\nare not corrected for Galactic extinction.",
  "circularId": 27764,
  "createdOn": 1589939923000,
  "email": "amitkundu515@gmail.com",
  "subject": "GRB 200519A: 1.3m DFOT Optical Afterglow Detection",
  "submitter": "Amit Kumar at ARIES, India  <amitkundu515@gmail.com>",
  "eventId": "GRB 200519A"
}