{
  "bibcode": "2021GCN.30645....1V",
  "body": "P. Veres (UAH) reports on behalf of the Fermi-GBM team:\n\n\"\nFermi GBM triggered on GRB 210812A at 16:47:01 UT on 12 Aug 2021 (trigger\n650479626 / 210812699). Location information can be found in the Fermi GBM\nteam GCN 30633.\n\nThe lightcurve of GRB 210812A consists of two pulses, separated by about 33\ns. The two pulses have similar shapes, the first pulse being approximately\n5 times brighter.\n\nThe best fitting spectral shapes are consistent between the pulses. The\nhardness ratio as a function of time also shows a consistent evolution.\n\nThese observations suggest that the two pulses are gravitationally lensed\nmanifestations of a single pulse.\n\nAssuming a point mass lens model (e.g. Mao 1992, ApJL, 839, 41), the mass\nof the lens is about 10^6 Msun.\n\nGRB 210812A was also detected by INTEGRAL/SPI-ACS.\n\nThis analysis is preliminary, further analysis is ongoing. We encourage\nfollow-up observations.\n\"",
  "circularId": 30645,
  "createdOn": 1628886875000,
  "email": "veresp@gmail.com",
  "subject": "GRB 210812A is consistent with being a lensed GRB",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "GRB 210812A"
}