Observer : Morgan Fraser Support team : Southampton (Mat Smith and others) TAT : Joe Anderson, Cosimo Inserra Start of night: Haze visible, some clouds on the horizon to the W. 2 m/s wind, 55% humidity Moon from 03.40 onwards at 55% illumination End of night: Some thin cirrus visible in second half of the night. Wind 5 m/s, humidity 60% Seeing: 1" at start of night, subarcsecond seeing for most of the night (with a couple of spikes to 1-1.2" on the DIMM) Excellent seeing all night, so I concentrated on imaging followup. No classifications - had a full schedule of critical/important follow-ups. Afternoon calibrations: SOFI imaging flats, arcs and specflats 23.40 SOFI Standard LTT 3218 23.49 PSNJ07361576-6930230 00.24 End twilight BG+RG 01.12 Switch to EFOSC, focussing 01.21 ASSASN-14ha BVRi imaging (6x150s B, 3x200s VR). Seeing measured at 1" at start of sequence Some images show slight elipticity in PSF, but they are still useable. 02.26 Image analysis. 02.34 LSQ14bdq griz imaging - note that gr images will be in darktime, iz images will be taken just as moon is coming up. But for these filters and moon phase, the difference in sky brightness is <0.2 mag/arcsec, so it should be ok. Seeing is 0.6" in g' images at start of sequence. 04.16 PSNJ07361576-6930230 1500s Gr#11, 900s Gr#16 Calibration unit did not move after Gr#16 spectrum, so first internal flat is of the SN. TO put calibration unit in manually, and re-did flats. 05.15 LTT3864 standard 05.28 PS15br 2x1500s Gr#11 followup 06.20 SN2015D 3x300s U, 1x200s B, 1x90s V imaging (source visible in all bands) 2x1800s Gr#11 spectroscopy (started at 06.50), S/N good 07.55 PSNJ14095513+1731556 BVRi imaging, SN clearly detected in all bands 08.15 LSQ15rw Gr#13 followup, 2x1500s. Good S/N in spectra. 09.11 ASASSN-15bd 1x1500s Gr#11, 1x1200s Gr#16 followup 09.21 Start twilight Too bright for a standard U skyflats 10.33 Sunrise |
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