Discovery certificate for object 2019ysf
TNS Astronomical Transient Report No. 56500 [ 2019TNSTR2719....1S ]

Date Received (UTC): 2019-12-28 16:47:18
Sender: Dr. Graham Smith
Reporting Group: GLGW     Discovery Data Source: GLGW

Graham P. Smith (Birmingham), Matt Nicholl (Birmingham), Keren Sharon (Michigan), Matteo Bianconi (Birmingham), Watson P. Varricatt (UKIRT), Sam Benigni (UKIRT), Evan J. Ridley (Birmingham) report/s the discovery of a new astronomical transient.

IAU Designation: AT 2019ysf
Discoverer internal name: GLGWc19a
Coordinates (J2000): RA = 21:32:45.500 (323.189583) DEC = +05:19:58.00 (5.332778)
Discovery date: 2019-12-20 05:24:10 (JD=2458837.7251157)


Remarks: Candidate kilonova counterpart to LIGO/Virgo's S191216ap (GCN #26454), within HAWC sky localization (GCN #26472).

Photometry

Discovery (first detection):
Discovery date: 2019-12-20 05:24:10
Flux: 20.8 ABMag
Filter: Other-
Instrument: Other
Telescope: Other

Remarks: UKIRT/WFCAM z-band

Last non-detection:
Archival info: Other
Remarks: This source is not detected in Pan-STARRS1 z-band.

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2019ysf