VizieR Online Data Catalog: UV, optical and X-ray evolution of ASASSN-14ko (Payne+, 2022)

ASAS-SN is an ongoing all-sky survey to discover supernovae and other transient phenomena. The 20 robotic telescopes at five sites in both the Northern and Southern Hemispheres are hosted by the Las Cumbres Observatory Global Telescope (LCOGT). All telescopes obtain data in the g band. See Section 2.1.

Using our prediction of the optical peak time and the expected multiwavelength trend based on the 2020 May flare, we requested Swift UltraViolet/Optical Telescope (UVOT) target-of-opportunity (ToO) observations (ToO ID: 14389, 14488, PI: Payne). The UVOT data were obtained in six filters: V (5425Å), B (4350Å), U (3467Å), UVW1 (2581Å), UVM2 (2246Å), and UVW2 (2055Å). See Section 2.2.

We obtained photometric observations from the LCOGT using the 1m telescope at Siding Spring Observatory in New South Wales, Australia. The data consisted of B, V, g', and r' observations. See Section 2.3.

There were 28 epochs of ASASSN-14ko Pan-STARRS1 data between 2014 and 2020. See Section 2.4.

We used the 10m Southern African Large Telescope (SALT) with the Robert Stobie Spectrograph (RSS) to obtain optical spectra during the flare. The data were obtained with the 1.5" slit on UT 2020-09-04 and UT 2020-09-16, which corresponded to ~1day prior and ~11days after the measured optical g-band peak, respectively.

Amateur astronomer photometry data were collected using a 41cm telescope at Savannah Skies Observatory from Queensland, Australia. The 180s exposures were obtained using the B, V, and R_C filters, and the data were bias and dark subtracted. Data were also taken at Moondyne Observatory located east of Perth, Australia, using a 0.4m telescope with AOX adaptive optics. See Section 2.6.

(2 data files).