[vsnet-grb-info 23868] LIGO/Virgo S190930t: Magellan/IMACS imaging of Swift J224718-581442 (AT2019sbk)
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Oct 7 17:03:02 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 25967
SUBJECT: LIGO/Virgo S190930t: Magellan/IMACS imaging of Swift J224718-581442 (AT2019sbk)
DATE: 19/10/07 08:01:49 GMT
FROM: Subo Dong at KIAA-PKU <dongsubo at pku.edu.cn>
Ping Chen (KIAA, Peking University), Joshua D. Simon (Carnegie Observatories), and Subo Dong (KIAA, Peking University) report:
We 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).
On 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.
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