Instructions from the PI

Dear NOT observer and staff.

This is a set of instructions for NOT monitoring programme P62-504 (PI:Håkon Dahle), scheduled for service observations. The purpose is to monitor three of the five currently known gravitationally lensed quasars where the lens is a galaxy cluster. The main purpose of the observations is to use the light curves to make time delay measurements between multiple lensed quasar images in order to estimate the value of the Hubble constant. We will also determine the level of microlensing in each lens system. 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 the script indicated by the OB.

The coordinates of the target are:
RA (J2000) = 09:09:45.3
DEC(J2000) = +44:49:53.9

We ask for the following observations with ALFOSC, 20 min:

Calibrations:

For calibration we request:

- A set of three twilight flats for the SDSS g' filter
- alfosc-calibs

Available scripts

Go to the directory
cd ~/scripts/62-504

For these observations use the appropriate script for the date, complie the OB if needed.

Observations

20 minutes per epoch

Date Time (UT) Duration Comments

02-04 (EAT-15m)-00:40 00:20 epoch19 J0909

10-04 (EAT-15m)-00:10 00:20 epoch1 J0909

15-04 22:50-00:40 00:20 epoch2 J0909

28-04 (EAT-15m)-21:40 00:20 epoch3 J0909

06-05 (EAT-15m)-23:20 00:20 epoch4 J0909

14-05 22:30-23:50 00:20 epoch5 J0909

28-05 (EAT-15m)-22:40 00:20 epoch6 J0909

05-06 (EAT-15m)-22:25 00:20 epoch7 J0909

10-06 (EAT-15m)-22:05 00:20 epoch8 J0909

Finder

P62 tracking

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