Night Report 2015-02-25

Observers : Laurent Le Guillou, Sylvain Baumont, Ayan Mitra

Support team : Nicolas Chotard, Pierre François Leget

TAT : K. Maguire, J. Polshaw

We used only EFOSC2, mainly for follow-up observations.

Clear sky at sunset, wind raised from 5m/s to 10m/s, humidity dropped fom 60% to 40%.

Moon passed 1st quarter, 56% illumination, setting at 4:20.

The night was probably not photometric (low atmospheric pressure and some cirrus

towards south-western horizon, downwind, after 4:00).

(times are in UT)

CALIBRATIONS :

 - Evening : EFOSC_bias, EFOSC_FlatSpec, EFOSC_SpecArc

   - 23:40 : EFOSC_SkyFlat gr 

           (tracking issue => only 4 images out of 5, and no time left for i-band)

 - Morning

   - 10:08 : EFOSC_SkyFlat i

SCIENCE OBSERVATIONS :

 --- EFOSC ---

 - 00:15  image analysis and focus

 - 00:27  STD L745a, Gr11 Gr13 Gr16, slit 1", airmass 1.1

 - 00:47  OGLE-2015-SN-035 Follow-up, Gr13:2x2700s, slit 1"

        Airmass 1.3, unstable seeing ranging from 1.3" to 2", 86º from the moon.

 - 02:25  PSNJ10544216-2104138 Follow-up, Gr16:2x1800, slit 1.5"

        Airmass 1.2, seeing 1" to 1.5", 99º from the moon.

 - 03:43  SNHiTS15L Classification, Gr13:1800s, slit 1"

        Airmass 1.1, seeing 1" to 1.4", 83º from the moon

        => SN-Ia around 1 week pre-max, z ~ 0.15

 - 04:20  STD LTT3864, Gr11 Gr13 Gr16, slit 1", airmass 1.01

 - 04:31  Photometric Standard Field PG1047, UBVRigrz

        39% humidity, temperature 14º, airmass 1.16

 - 04:43  LSQ14bdq Follow-up, griz:6x200s

        Airmass 1.1, seeing 1" to 1.3"