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SWIFT observations and flash ionization features in the spectrum of DLT17h/SN 2017ahn

ATel #10066; L. Tartaglia (TTU, UC Davis), G. Hosseinzadeh (Las Cumbres Obs./UCSB), D. Sand (TTU), S. Valenti (UC Davis), S. Wyatt (TTU), I. Arcavi, D. A. Howell, C. McCully (Las Cumbres Obs./UCSB)
on 10 Feb 2017; 03:31 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Leonardo Tartaglia (ltartaglia@ucdavis.edu)

Subjects: Optical, Ultra-Violet, Supernovae, Transient

Referred to by ATel #: 10067, 10147

We report follow-up observations of the Type II DLT17h/SN 2017ahn (ATels #10058, #10059) in the UV domain with the SWIFT satellite (Gehrels et al. 2004).
Three target of opportunity observations were obtained on 2017-02-08.6 (~3.0 ks), 2017-02-09.2 (~3.2 ks) and 2017-02-09.6 (~3.2 ks).
DLT17h was detected in the Swift UV/Optical Telescope (UVOT; Roming et al. 2005) data with the following apparent magnitudes:

 
JD          | Mag   | Err  | Filter 
2457793.121 | 16.99 | 0.10 | V
2457793.131 | 16.65 | 0.06 | UVM2
2457793.146 | 16.49 | 0.07 | UVW1
2457793.148 | 16.43 | 0.06 | U
2457793.149 | 17.42 | 0.06 | B
2457793.151 | 16.62 | 0.08 | UVW2
2457793.722 | 15.84 | 0.06 | UVM2
2457793.750 | 15.64 | 0.06 | UVW1
2457793.751 | 15.76 | 0.06 | U
2457793.751 | 16.76 | 0.05 | B
2457793.753 | 15.78 | 0.07 | UVW2
2457793.754 | 16.58 | 0.07 | V
2457794.081 | 15.72 | 0.06 | U
2457794.082 | 16.64 | 0.06 | B
2457794.085 | 16.50 | 0.08 | V
2457794.112 | 15.77 | 0.08 | UVW1
2457794.115 | 15.78 | 0.08 | UVW2
2457794.120 | 15.72 | 0.07 | UVM2

We also report the presence of flash ionization features (H-alpha, H-beta, He I, He II, and N IV emission with electron-scattering profiles; see Gal-Yam et al. 2014, Nature, 509, 471) in spectra of DLT17h/SN 2017ahn taken on 2017 February 9 UT with the robotic FLOYDS instrument mounted on the Las Cumbres Observatory 2-meter telescope on Haleakala, Hawai'i.
Further observations are encouraged.