{
  "bibcode": "2022GCN.32576....1W",
  "body": "Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Simone\nDichiara (PSU), Diego Gonzalez (UNAM), Alexander Kutyrev (GSFC/UMD),\nWilliam H. Lee (UNAM), Oc��lotl Lopez (UNAM), Margarita Pereyra (UNAM),\nand Eleonora Troja (GSFC/UMD) report:\n\nWe observed the field of the Fermi/LAT GRB 220921A (Pillera et al., GCN\nCirc. 32568) with the DDOTI wide-field imager at the Observatorio\nAstron��mico Nacional on Sierra San Pedro Martir\n(http://ddoti.astroscu.unam.mx) from 2022-09-23 11:51 to 12:24 UTC\n(48.75 to 49.30 hours after the trigger) obtaining 2040 seconds of\nexposure.\n\nAt the position of the OT detected by MASTER-Net (Lipunov et al., GCN\nCirc. 32570) we detect a source with w = 19.31 +/- 0.13. We calibrate\nour photometry against the APASS catalog.\n\nThe afterglow has continued to fade from the observations reported by\nLipunov et al. (GCN Circ. 32570) and de Wet et al. (GCN Circ. 32572).\n\nWe thank the staff of the Observatorio Astron��mico Nacional in San Pedro\nMartir.",
  "circularId": 32576,
  "createdOn": 1663942781000,
  "email": "alan@astro.unam.mx",
  "subject": "GRB 220921A: DDOTI Detection of the Afterglow",
  "submitter": "Alan M Watson at UNAM  <alan@astro.unam.mx>",
  "eventId": "GRB 220921A"
}