Night Report 2014-04-20

Observers: Sandra Benitez, Joe Polshaw

Support: Matt Nicholl, Stephen Smartt

TAT on duty: Morgan Fraser, Nancy Elias-Rosa, Joe Anderson



start: wind 0.3 m/s; temp. 16 C; humid. 9%; Clear. 

middle: wind 2 m/s; temp. 17 C: humid. 8%; Clear.

end: wind 4.6 m/s; temp. 14.9; humid. 13%; Clear

Conditions were photometric. The seeing fluctuated a bit at the start of the night, between 0.4” to 1.2”, and then settled to ~0.8" to 0.9” for the rest of the night. 


INSTRUMENT: EFOSC2 (SOFI is not available tonight)



 -- Bias 

 -- Spectroscopic dome flats

 -- Arcs

*** The first set of arcs are useless - the TO forgot to turn the HeAr lamp on. We repeated the OB for arcs so the second set should be OK. We will repeat the arc OB in the morning to be sure. ***

Evening twilight:

-- Sky flats: gri

Morning twilight:

-- Arcs

-- Sky flats: RV



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

L745a                   STD (SPEC)             23:31            Gr11/13/16        1/1.5          0.75              -

LSQ14mo              Follow. (IMAG)       23:55             gri                      N/A             0.8              (1)

LSQ14mo              Follow. (SPEC)        00:55            Gr13                    1                 0.9              (2)

SN2014ad             Follow. (SPEC)        03:45            Gr11/16              1                 0.8               -

LTT3864               STD (SPEC)             04:30            Gr11/13/16        1/1.5           0.7              -

LSQ14asn             Class.                     05:02            Gr13                    1                 0.7              (3)

LSQ14baz             Class.                     05:40            Gr13                    1                 0.9              (4)

LSQ14aym            Class.                     06:00            Gr13                    1                 0.9              (5)

LSQ14bcj              Class.                     06:20            Gr13                    1                 0.9              (6)

LSQ14azr             Class.                      06:40            Gr13                    1                0.9               (7)

PSNJ21461482     Class.                      07:02            Gr13                    1                0.9               (8)

SN2009ip             Follow. (IMAG)         07:24            VRi                      N/A            0.8               (9)

LSQ14azm            Class.                     08:45            Gr13                    1                1.0              (10)


(1) Some fluctuation in the DIMM (1-1.3") in seeing at first, but the seeing measured on the images is ~0.8" and improved later (even down to 0.4). There was some 'mis-communication' with the TO, the offset away from the bad column was not applied. Looking at the images after reduction, it should still be possible to do the photometry since the bad column is well masked by the pipeline.

(2) Very faint trace, if anything at all in single exposures.

(3) There was some trouble finding a suitable guide star so a little bit of time was lost. Type II at peak, z=0.054. A *very* long and well sampled rise-time of 25 to 35 days, interesting for a type II. At this redshift and magnitude (m~19.5), the absolute mag is M~-17.2. The host also appears to be very faint.

(4) Normal Type Ia at z~0.07 at peak.

(5) Normal Type Ia at z~0.06, around peak

(6) Normal Type Ia, z=0.025, around 1 week before peak

(7) Type Ia, 91T-like, z=0.077, around peak to 1 week after max.

(8) High airmass. Normal Ia 1 week to 9 days before peak, z~0.036

(9) Very high airmass to start. We delayed the start by ~5 mins since it was so low. Clear detection in individual images in all bands

(10) High airmass. Normal type Ia, +8 days, z~0.11