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Night Report 2015-02-24

Observers : Laurent Le Guillou, Sylvain Baumont, Ayan Mitra
Support team : Nicolas Chotard, Pierre François Leget
TAT : K. Maguire, J. Polshaw

We did mainly follow-up observations, with EFOSC and SOFI.

Clear sky, wind increasing from 5m/s to 10m/s, humidity from 60% down to 40%. 
Moon at 1st quarter, 45% illumination, setting at 3:30.
Photometric night.

(times are in UT)

CALIBRATIONS :
 - Evening : EFOSC_bias, EFOSC_FlatSpec, EFOSC_SpecArc
   - 23:40 : EFOSC_SkyFlat UBVRi
 - Morning : our T.O. must leave early; No morning SkyFlat.

SCIENCE OBSERVATIONS :
 --- EFOSC ---

 - 00:10  image analysis
 - 00:20  STD GD71, Gr11 Gr13 Gr16, airmass 1.42
 - 00:42  Photometric Standard Field RU152, UBVRigrz
        55% humidity, temperature 13º, airmass 1.18

 - 00:56  OGLE-2015-SN-043 Follow-up, B:3x500s V:3x300s Ri:2x300s
        Airmass 1.4, seeing 1" to 2.4", 90º from moon

 - 02:14  LSQ15ok Classification, Gr13:600s
        => SN-II pre-max, z ~ 0.01
 
 - 02:30  STD L745a, Gr11 Gr13 Gr16, airmass 1.03

 - 02:56  PSNJ10544216-2104138 Follow-up, Gr11:2x1800s, slit 1.5"
        Airmass 1.2, seeing 0.8" to 1.4"

 - 04:00  Photometric Standard Field PG1047, UBVRigrz
        40% humidity, temperature 14º, airmass 1.2

 --- SOFI ---

 - 04:22  STD LTT3218, BG RG, slit 1", airmass 1.04
 - 04:36  Telluric Standard HIP053497, BG RG, slit 1"
        39% humidity, temperature 14.6º, airmass 1.03

 - 04:44  PSNJ10544216-2104138 Follow-up, BG:4800s, slit 1"
        Airmass 1.02, seeing 0.7" to 1.2" 

 - 06:29  Telluric Standard HIP053497, BG RG, slit 1"
        40% humidity, temperature 13.6º, airmass 1.06
 - 06:35  Telluric Standard HIP056242, BG RG, slit 1"
        No telluric std. found close to the equator => 14º north of PS15ae  
        40% humidity, temperature 13.6º, airmass 1.4

 - 06:44  PS15ae Follow-up, BG:4800s RG:1800s, slit 1"
        Airmass 1.2 to 1.7, seeing 0.8" to 1.5"
        We aborted the RG OB after 4 exposures out of 8 to keep time for the telluric.

 - 09:17  Telluric Standard HIP056614, BG RG, slit 1"
        No telluric std. found close to the equator => 16º south of PS15ae 
        42% humidity, temperature 12.9º, airmass 1.46

CONCLUSIONS :

 Classification 
 * LSQ15ok : SN-II pre-max, z ~ 0.01

 Follow-up
 * OGLE-2015-SN043 BVRi  
 * PSNJ10544216-2104138 Gr11:2x1800s BG:4800s
 * PS15ae BG:4800s RG:1800s
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