{
  "bibcode": "2019GCN.25967....1C",
  "body": "Ping Chen (KIAA, Peking University),  Joshua D. Simon (Carnegie Observatories), and Subo Dong (KIAA, Peking University) report:\n\nWe observed the transient Swift J224718-581442 (AT2019sbk) (Tohuvavohu et al., GCN Circ. 25964), which was discovered in the UVOT and XRT search for the electromagnetic counterpart of LIGO/Virgo S190930t (LIGO/Virgo Collaboration GCN Circ. 25876). \n\nOn 2019-Oct-07.14 UTC (JD = 2458763.64), we obtained g���-band (90s exposure) and i���-band (60s exposure) images with IMACS mounted on the 6.5 meter Magellan telescope at Las Campanas Observatory. We do not detect the source at the reported position (RA = 22:47:18.1 Dec = -58:14:50.80) in these images with approximate 3-sigma upper limits of ~22.4 mag in g���-band and ~22.9 mag in i���-band, respectively.",
  "circularId": 25967,
  "createdOn": 1570435309000,
  "email": "dongsubo@pku.edu.cn",
  "subject": "LIGO/Virgo S190930t: Magellan/IMACS imaging of Swift J224718-581442 (AT2019sbk)",
  "submitter": "Subo Dong at KIAA-PKU  <dongsubo@pku.edu.cn>",
  "eventId": "LIGO/Virgo S190930t"
}