Instructions from the PI

Dear NOT observer and staff.

This is a set of instructions for NOT monitoring programme P52-031 (PI: Håkon Dahle), scheduled for service observations. The purpose is to monitor a unique gravitationally lensed quasar with six images separated by up to 15'', discovered at NOT (Dahle et al. 2013, ApJ, 773, 146) and observed with HST in Cycle 21. By measuring the light curves of the separate quasar images we will derive the time delays between the images and constrain the mass distribution of the galaxy cluster lens.

The target information and the observing strategy are reported below.

Please let us know whether you carried out these observations.

Thank you!

Best regards,
Håkon Dahle

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For the "monitoring" observations use
monitor52-031-script
and for the "FastTrack" use the script indicated by the OB.

The coordinates of the target are:
RA (J2000) = 22:22:08.6
DEC(J2000) = +27:45:35.6

We ask for the following observations with ALFOSC:

- SDSS g' (filter #120): 3 x 600 s
see the nominal constraints and the table below for details

You can use the following dither command:

alfosc.dither 3X 15 600

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For calibration we request:

- A set of four SDSS g-band twilight flats
- 10 bias frames

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Nominal constraint set (deviations from this are noted in comments below):
-Moon below horizon.
-Airmass < 1.5
-Seeing < 1.1''
-Thin clouds OK

The plan for programme 52-031 would be as follows (3x600s) :

Date	Start time (UT)	Comments
06-10	01:00--01:50
10-10	00:40--01:30	Start after 52-016
15-10	00:50--01:30	Start after 52-016
03-11	00:20--00:30	Start after 52-016
07-11	19:30--23:00
14-11	20:45--23:00
04-12	19:30--21:30
10-12	19:30--21:00
29-12	19:40--20:30	Airmass < 1.55
05-01	19:40--20:00	Airmass < 1.7
10-01	19:45--20:15	Airmass < 2.0

Available scripts

Go to the directory
cd ~/scripts/52-031

For these observations use
monitor52-031

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