Night report 2014-02-19

Observers: Morgan Fraser, Heather Campbell

Support team: Nadia Blagorodnova, Nic Walton

TAT: Nancy Elias-Rosa, Annalisa De Cia

General comments:

Moon was a problem for most of the night, as many PRIORITY and IMPORTANT followup targets were <30 degrees from the moon we could not observe them. Hence we did more classification than followup (there were no SOFI targets in the second half on the night when the moon was up). Two interesting classification targets - SMTJ01353283-5757506 (blue continuum) and OGLE-2014-SN-012 (slightly blue continuum).


Moon: 75% illumination, UT 02.00 onwards


Start of night:    Wind 5m/s, Humidity 40%. Thin haze, and some clouds on the horizon

Middle of night: Wind 0 m/s, Humidiy 40%. Seeing ~0.7"

End of night:


23.33UT    Start of twilight

                 UVi skyflats

00.12        LTT745a spectrophotometric standard

00.40        SMTJ01353283-5757506    (classification)

                 Blue, largely featureless continuum. Some possible weak features in the blue, and a possible broad emission feature around ~7000 Ang. Lightcurve shows a slow rise of ~1 mag in at least 30 days, the object now seems to be around maximum light. No host galaxy down to r~20.5. Would suggest a higher S/N Gr#11 spectrum is taken tomorrow night.  

00.55        Telescope operator image analysis

01.08        LSQ14mo (followup)

                 3x1800s Gr#13 - decent S/N. First two spectra taken when fully dark, last as moon just starting to rise

02.55        PS1-14lz (classification)

                 Ia around maximum light, z=0.07

03.17        SN2013ai (followup)

                 VRi photometry

03.55        OGLE-2013-SN-016 (followup)

                 BVRi photometry - used EFOSC_img_acq_PresetNoGuide to acquire due to lack of guide stars.

04.49        OGLE-2014-SN-011 (classification)

                 Narrow Balmer lines on a blue continuum at z=0.083, abs mag ~ -17.8. Probable IIn

05.20        CSS140204-092250+292926 (classification)

                 Normal Ia, +10 days, z=0.06

05.36        OGLE-2014-SN-012 (classification)

                 Spectrum was featureless, slighly blue. Possible broad emission at ~4500 Ang. But lightcurve looks quite SN-like, with 1.5 mag rise over 20 days. No host galaxy or previous detection of variability in OGLE data. Decided to return later in the night for longer spectrum to secure classifcation.

06.15        CSS140218-095739+123318 (classification)

                 Ia around maximum light (or a few days before). Best matches are to 91T-like SNe, z=0.07

06.35        OGLE-2014-SN-012 (classification)

                 Revisit to OGLE-2014-SN-012 (observed earlier) to take longer spectrum Took 2x1200s in Gr#11, but got much lower S/N than expected (and lower in the second spectrum than the first). Poor transparency or target not fully in slit? Either way, the classification is still ambiguous.

07.20        SN 2013am

                 Followup - dropped B from imaging OB due to moon. Got marginal counts in V, good data in Ri. Due to error in OB, the target name is set to "No Name".

08.00        OGLE-2014-SN-016 (classification)

                 Ia a few days after maximum light, z=0.07

08.25        MLS140209-104850+102820 (classification)

                 Ia at +1 week, z=0.13

09.03        Start of twilight

09.05        MASTERJ160432.41+122840.7 (classification)

                 z=0.04 Ia at +1 month

09.20        LTT7379 spectrophotometric standard

09.43        BR skyflats