{
  "createdOn": 1675118211000,
  "version": 2,
  "email": "annayqho@berkeley.edu",
  "body": "Anna Y. Q. Ho (Cornell) reports on behalf of a larger collaboration:\n\nWe observed the fast optical transient AT2023avj (Wang et al., GCN Circ.\n33226 and AstroNote 2023-17) with Swift/XRT beginning at 2023-01-27 14:46\nUT, or 5.3d after the first ZTF detection. In a 4.6ks exposure, we detect\nX-ray emission with a count rate of 0.003 +/- 0.001 ct/s. Using WebPIMMS\n[1] we estimate [2] that this corresponds to an unabsorbed 0.3-10 keV flux\ndensity of 1.1E-13 ergs/cm2/s, similar to the flux density of GRB\nafterglows at this phase.\n\nNo GRB counterpart has been reported.\n\nWe thank the Swift staff for rapidly approving and scheduling our\nobservations.\n\n[1] https://heasarc.gsfc.nasa.gov/cgi-bin/Tools/w3pimms/w3pimms.pl [2]\nUsing a hydrogen column density of 1.6E20/cm2 (Willingale, R., et al. 2013,\nMNRAS, 431, 394) and a power-law index of 2",
  "editedOn": 1777053068678,
  "bibcode": "2023GCN.33238....1H",
  "eventId": "AT2023avj",
  "submitter": "Anna Ho at UC Berkeley  <annayqho@berkeley.edu>",
  "circularId": 33238,
  "subject": "AT2023avj: X-ray Detection with Swift/XRT",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>"
}