Night Report 2014-04-30

Observers: Sandra Benitez, Joe Polshaw

Support: Kate Maguire

TAT on duty: Andrea Pastorello, Cosimo Inserra

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WEATHER CONDITIONS:

start: wind 5 m/s; temp. 8.3 C; humid. 35%; Some clouds on the horizon, almost entirely clear sky

middle: wind 8.3 m/s; temp. 9.9 C: humid. 14%; Clear, became cloudy at about 6:00 UT

end: wind 10.4 m/s; temp. 10.5; humid. 10%; Cloudy

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INSTRUMENTS: EFOSC2, SOFI

CALIBRATIONS

Afternoon:

-- EFOSC bias, arcs, dome flats

Twilight:

-- Sky flats: UB -- Too late - will repeat in the morning. (or not - it was cloudy!)

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OBSERVATIONS

Target Type UT-Start Filter/Grism Slit (") Seeing (") Notes

*** EFOSC2 ***

OGLE-016 Follow (IMAG) 23:07 VRi N/A 1 (1)

l745a STD (SPEC) 00:40 Gr11/13/16 1/10 0.9 (2)

CSS140424... Follow (SPEC) 01:10 Gr11/16 1 1 (3)

CSS140424... Follow (IMAG) 02:59 UBVRi N/A 1 (4)

CSS140421... Follow (SPEC) 03:25 Gr13 1 0.9 (5)

CSS140421... Follow (IMAG) 05:32 UBVRi N/A 1 (6)

*** Change to SOFI ***

*** Cloud cover across the whole sky during the switch to SOFI until the end of the night ***

(1) OGLE-2013-SN-016. Templates in VRi, 6*100s each. Used "EFOSC_img_acq_PresetNoGuide" to acquire the target due to previous problems with finding a guide star. First two exposures started too early (sky too bright). Since the target was low and declining, we did not perform image analysis but just did a focus.

(2) Full image analysis. We lost quite a lot of time here since there was a problem with the telescope, which took a while to identify and fix. Clear sky so we used slit 10" instead of 1.5" in order to test the throughput. We will do 1"/1.5"/10" with the STD later in the night (if all goes well), since there are a lot of targets to observe early in the night.

(3) CSS140424-133007-212728. 2*1800s gr11, 1800s gr16. Very interesting and decent S/N spectra. H-alpha in emission only (z~0.018). In the blue, it looks as though there are many low velocity (~1500 km/s ?) p-cygni lines, including more of the Balmer series.

(4) CSS140424-133007-212728. U 300s, B 45s, V 30s, Ri 20s

(5) CSS140421-142042+031602. Gr13, 3*2400s

(6) CSS140421-142042+031602. U 3*300s, B 200s, V 90s, Ri 60s