Night report 2014-02-21
Observers: Morgan Fraser, Heather Campbell
Support team: Nadia Blagorodnova, Nic Walton
TAT: Nancy Elias-Rosa, Annalisa De Cia
Concentrated on followup targets, only one new classification, plus one revisit to ambiguous classification from Feb 19. Spectrophotometric standard not taken at start of the night, as we had a large number of important followup targets which set early in the night.
Moon: 55% illumination, UT 03.30 onwards
Humidity 20-40%, wind <5miles per hour, some haze visible at sunset
Seeing 1" or better throughout night (from DIMM and measured off images)
23.32 Start of twilight
BR skyflats, TO performed image analysis
1x1200s Gr#16 followup
00.47 End of twilight
12x200s V-band imaging. Up to ~1.5" FWHM measured on images (seeing from DIMM was ~1", but observations were taken between airmass 2 and 3).
2x1800s Gr#13 followup
4x1800s Gr#16 followup. First 2x1800s exposures taken, then internal flats, then new acquisition image, another 2x1800s exposures, internal flats again.
05.27 Spectrophotometric standard LTT3864
Revisited for longer classification spectrum, 2x1800s with Gr#13. Quick reduction still looks blue and (mostly?) featurless.
Gr#13 classification spectrum. Very blue, with narrow Balmer emission at z = 0.077. Halpha is fitted with a Lorentzian of FWHM ~1400 km/s. Also emission feature at ~5890 rest frame - could this be HeI? Absolute mag is now -18.7, but transient continues to rise. No clear offset from host - potentially nuclear
3x1800s Gr#16 followup spectra
09.05 Start of twilight
09.10 Spectrophotometric standard EG274
Classification target - stellar variable.
09.55 rz skyflats