Date: 2021 Apr 17 UTC
LBTO Observer: Olga Kuhn
Lead Partner Observer: Charlotte Wood (ND)
Other Partner Observers: Peter Garnavich (ND), Rick Pogge (OSU, at start)
Telescope Operator: Steve Allanson (LBT)

Moon phase: 3d before first quarter

Summary:

A good night overall - we started with the LBCs and observed the
ND_BASIC program and one OSU_monitor target, N4826. Then we
reconfigured for MODS and observed priority long-look targets
OSU_ASASSN/ASASSN14li (3h) and ASASSN14ax (2h). We ended with the
observation of the spectrophot standard BD+33 2642.

The sky was clear (the cirrus at sunset cleared out by twilight) and
the seeing was subarcsecond and stable all night.


Calibrations: 
  MODS imaging sky flats end of the night
  MODS flux star end of the night
  
Completed Observations:
  ND_BASIC (3 OBs)
  OSU_monitor N4826
  OSU_ASASSN: ASASSN14li and ASASSN14lx
  

Details (All times UT):
----------------------------------

01:54 sunset

ND_BASIC/HE1003

02:40 Slewing to the ND_Basic focus/collim/copoint target. 

02:45 dohybrid

02:46 12-deg twilight

02:56 copointed

02:56 running dohybrid, dofpia a few more times to reduce deadtime
      between last collimation and start of the OB.

HE1003A

03:08 Starting the first OB, A (g+r). The sky brightness has levelled
      off and the moon is out anyway.  On the guiders, 0.9" on the
      blue and 1.3" on the red. (Unusual to find the red FWHM larger
      than blue, but we have had this before, a few nights ago. Will
      see what the IQ is on the science chips).


On the 2nd and 3rd dithers, the guider has 0.7"-0.8" FWHM on the red,
consistent with what we see on the blue side. So perhaps it was
guiding on a compact galaxy on the 1st.

03:17 18-deg twilight

Background levels do seem to be a tad higher on the first exposure wrt
the latest one (~5%).

03:31 Running dofpia again (on the copoint field) before starting the
      next OB.

HE1003B

03:37 Starting the first Us+i OB, B.

04:05 dofpia. The IQ had degraded but only a little bit (to 3.5 pix on
      the blue). Two iterations were needed to converge. (focus/collim
      done on the field itself - there were 10 pupils).

HE1003C

04:10 Starting the 2nd Us+i OB, C.
      A second satellite streak - on r 041122

04:39 - finished


OSU_monitor/N4826

04:39 Slewing to the focus field

04:41 dofpia - converged in 4 iterations

04:48 copointing

04:51 Starting the science OB

05:29 finished

------------------------------

05:30 Reconfiguring LBCs→ MODS


OSU_ASASSN/ASASSN14li

There are two acq scripts, ASASSN14li_UT0630 (POSANGLE -53) and
ASASSN14li_UT1030 (POSANGLE -126). If we slew to the target at 6 UT
and assume 15-min for acquisition, then we'd reach the mid-point of
the exposure at 07:38 UT when the parallactic angle is -136 deg.

Edited the UT1030 acquisition script to use POSANGLE -136 and had to
select a new guide star. The guide star in the UT1030 script was a
galaxy, according to SDSS DR10.


05:55 Steve has pointed and went to the collimation star. There was a
      comm error with the azcam server - Steve is rebooting the azcam
      computer.


05:59 acqBinoMODS ASASSN14li_edit.acq
      The seeing is 0.6/0.7" during the acquisition


06:16 execBinoMODS ASASSN14li.obs. 

      This is a series of 10 900-sec exposures, lasting about 2.8 hrs.
      seeing 0.6-0.8 arcsec


09:08 - seeing ~1-arcsec at end
	

OSU_ASASSN/ASASSN14ax

Created a new acquisition script with a PA = -50 deg, the parallactic
angle at 10:15 (estimated to be the midway point, assuming we slew at
02:10 and take 15 min to acquire. The observation is 100 minutes total
with overheads). The original script used PA = -65 deg and the same
guide star is available for both.


09:09 acqBinoMODS ASASSN14ax_edit.acq

The galaxy did not have a very sharp central peak, but nevertheless
"a" worked and was used to measure the centroid.

09:29 execBinoMODS ASASSN14ax.obs
      seeing ~0.7 arcsec during the 2h

      The first spectra show emission lines [OII], Hbeta+[OIII],
      H_alpha + [NII] and [SII]

11:15 - finished


Flux Star BD+33 2642

11:16 acqBinoMODS bd332642.acq

11:21 18-deg twilight
11:25 execBinoMODS bd332642.obs

11:38 finished 

11:51 12-deg twilight

CALIBRATION: MODS Imaging Sky Flats

11:51 Slewing to blank field 17+66 for MODS imaging flats, for
      archival use. Not time to reconfigure to the LBCs for sky flats.

      Took a set of red-only r_sdss flats, but did not get to any
      dual-imaging flats before it got too light.

12:30 Steve is closing.

12:41 3K biases for the flats.

12:44 sunrise