Instructions from the PI

This is a set of instructions for NOT monitoring programme P70-502 (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.

Calibrations:

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

Available scripts

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

Observations

CJ0335-1927 20 minutes 15 epochs

CJ0542-2125 20 minutes 17 epochs

J0909+44, 20 minutes 6 epochs

CJ1153+0756 35 minutes 15 epochs

J1326+48 13 minutes 15 epochs

J2222+2745 20 minutes 4 epochs

Program Tracking
Proposal	70-502
Semester	P70: 20241001 - 20250401
Principal Investigator	Hakon Dahle
Programme	Cluster-lensed quasars as probes of Hnaut
Instrument	ALFOSC
Time Allocation	15x764s SJ1326, 15x1214s CJ0335, 17x1214s CJ0542, 15x2114s CJ1153, 4x1214s SJ2222, 6x1214s SJ0909
Total Nights	2.6
Type	Mon
Notes	Fixed dates to be scheduled
Total Time Spent	03:32 (hh:mm)

Proposal	Date	Time	Type	Targets	Files	Comments	Status
70-502	2024-10-07	00:38	Mon	COOLJ0335-1927, COOLJ0542-2125	ALHj070310 - ALHj070312, ALHj070360 - ALHj070362	Observed in clear skies with seeing around 1.0"	Observed
70-502	2024-10-08	00:18	Mon	SDSSJ2222	ALHj080034 - ALHj080036	Observed in clear skies with seeing around 0.7"	Observed
70-502	2024-10-11	00:19	Mon	COOLJ0335-1927	ALHj110130 - ALHj110132	Clear skies and seeing around 1.0''	Observed
70-502	2024-10-13	00:41	Mon	SDSSJ0909, COOLJ0542-2125	ALHj130265 - ALHj130270	Targets observed through thin clouds and seeing around 1 arcsec, with coolj0542_56 getting some thick clouds at the end of the observation.	Observed
70-502	2024-10-26	00:00	Mon	COOLJ0335-1927	ALHj260178 - ALHj260178	Target was attempted, but the seeing requirement could not be met	Failed
70-502	2024-10-27	00:00	Mon			No observations could be taken due to bad weather.	Failed
70-502	2024-11-03	00:20	Mon	COOLJ0335-1927	ALHk030124 - ALHk030126	Clear skies and seeing around 1.1''. Previously ctrl c'd because of cloud coverage.	Observed
70-502	2024-11-05	00:18	Mon	COOLJ0542-2125	ALHk050263 - ALHk050265	Observed during a clear sky, but with poor seeing (~3'').	Observed
70-502	2024-11-07	00:00	Mon	SDSSJ1326	-	The target was missed due to thick clouds.	Failed
70-502	2024-11-09	00:19	Mon	COOLJ0335-1927	ALHk090162 - ALHk090164	Observed with clear skies and seeing of around 1 arcsecond.	Observed
70-502	2024-11-10	00:39	Mon	COOLJ0542-2125, SDSSJ0909	ALHk100228 - ALHk100233	Targets COOLJ0542-2125, SDSSJ0909 observed with clear, dusty skies and seeing of around 2 arcsec. Missed COOLJ1153 because of the seeing requirements of the OB.	Observed
70-502	2024-11-13	00:00	Mon			Could not observe targets due to bad weather	Failed

Should any of the observations have been carried out using the OB system, you will find additional information HERE