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Night Report 2019-04-26

Observers:
Matt Nicholl, Phil Short

Support Team:
Charlotte Angus, Miika Pursiainen, Phil Wiseman

TAT:
Stefan Taubenberger, Mariusz Gromadzki, Janet Chen


Calibrations:
EFOSC2
Bias
Dome flats + arcs

Weather:
Start of twilight: Light clouds, 50% humidity, 3.8m/s wind
Sunset 22:21, End Twilight 23:34
Good observing conditions, clouds cleared up early on, humidity and wind all in the green

Comments:
No observing during twilight - EFOSC2 tests carried out by operator after installation of new component
Coma in acquisition images after 19ape due to a focus issue - fixed by refocusing
Coma reappeared before the Std but was fixed again

EFOSC2

 UT Target Type Setup Airmass Seeing Exp time Notes
 23:58 AT2019ahk
 Follow-up Gr#11+16 slit1.0
 1.38 (g11)
 1.45 (g16)
 1.3 (start g11)
 1.8 (start g16)
 1 x 1800s in each grism
 Seeing improved during the g16 exposure
 01:19 SN2019ape Follow-up Gr#13 slit1.0
 1.48
 1.53
 1.1
1.4
 2 x 2700s
 Stars show slight coma in acquisition, re-doing image analysis after spectrum. Issue solved
 03:30 SN2019but
 Follow-up Gr#16 slit1.0
 1.27 0.63 (from dimm)
 1.3 (from acq image)
 2 x 2700s
 
 05:28 EG274    
 Std Gr#11+16+13
slit1.0
 1.06
 1.3 4 x 60s
 Focus issue was visible again in initial acquisition. Telescope was refocused before spectra were taken.
 05:48 SN2019asz Follow-up Gr#13 slit1.0
 1.04 1.3 1 x 2700s
 
 06:40 PS19qu Classification
 Gr#13 slit1.0
 1.6
 1.5 1 x 1800s
 Spectrum dominated by SF galaxy at z=0.183, too far to be GW counterpart (GCN 24269)
 07:44 SN2017ivv Follow-up Gr#13 slit1.0
 1.86-1.13
 1.4
 3 x 2700s
 Needed a 120s acquisition image in r-band to acquire
 10:17 EG131
 Std
  Gr#11+16+13
slit1.0
 1.09  4 x 100s
 


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