Instructions from the PI
Dear NOT observer and staff.
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
------------
For the "monitoring" observations use
the script indicated by the OB.
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/71-510
For these observations use the appropriate script for the date, complie the
OB if needed.
Observations
| Date | Time (UT) | Duration | Comments |
| 04-04-2026 | (EAT-15m)-22:00 | 00:13 | epoch1 SDSSJ1326+4806 |
| 05-04-2026 | (EAT-15m)-23:00 | 00:50 | epoch1 SDSSJ0909+4449 |
| 07-04-2026 | (EAT-15m)-00:45 | 00:35 | epoch1 SDSSJ1004+4112 |
| 12-04-2026 | (EAT-15m)-01:30 | 00:50 | epoch2 SDSSJ0909+4449 |
| 13-04-2026 | (EAT-15m)-03:40 | 00:50 | epoch1 COOLJ1153+0756 |
| 14-04-2026 | (EAT-15m)-03:30 | 00:50 | epoch2 COOLJ1153+0756 |
| 14-04-2026 | (EAT-15m)-(SAT+15m) | 00:13 | epoch2 SDSSJ1326+4806 |
| 15-04-2026 | (EAT-15m)-01:20 | 00:50 | epoch3 SDSSJ0909+4449 |
| 16-04-2026 | (EAT-15m)-02:00 | 00:35 | epoch2 SDSSJ1004+4112 |
| 20-04-2026 | 23:30-03:10 | 00:50 | epoch3 COOLJ1153+0756 |
| 23-04-2026 | 02:20-(SAT+15m) | 00:13 | epoch3 SDSSJ1326+4806 |
| 23-04-2026 | 04:40-(SAT+15m) | 00:20 | epoch1 SDSSJ2222+2745 |
| 03-05-2026 | (EAT-15m)-21:45 | 00:13 | epoch4 SDSSJ1326+4806 |
| 05-05-2026 | (EAT-15m)-23:30 | 00:50 | epoch4 SDSSJ0909+4449 |
| 05-05-2026 | (EAT-15m)-23:35 | 00:35 | epoch3 SDSSJ1004+4112 |
| 09-05-2026 | (EAT-15m)-01:50 | 00:50 | epoch4 COOLJ1153+0756 |
| 10-05-2026 | (EAT-15m)-23:30 | 00:50 | epoch5 SDSSJ0909+4449 |
| 11-05-2026 | (EAT-15m)-00:25 | 00:35 | epoch4 SDSSJ1004+4112 |
| 12-05-2026 | (EAT-15m)-01:35 | 00:50 | epoch5 COOLJ1153+0756 |
| 14-05-2026 | (EAT-15m)-04:10 | 00:13 | epoch5 SDSSJ1326+4806 |
| 15-05-2026 | (EAT-15m)-23:30 | 00:50 | epoch6 SDSSJ0909+4449 |
| 16-05-2026 | (EAT-15m)-01:25 | 00:50 | epoch6 COOLJ1153+0756 |
| 16-05-2026 | (EAT-15m)-00:10 | 00:35 | epoch5 SDSSJ1004+4112 |
| 24-05-2026 | 02:35-03:30 | 00:13 | epoch6 SDSSJ1326+4806 |
| 25-05-2026 | 03:10-(SAT+15m) | 00:20 | epoch2 SDSSJ2222+2745 |
P72 tracking
| Program Tracking |
| Proposal |
72-510 |
| Semester |
P73: 20260401 - 20261001 |
| Principal Investigator |
Hakon Dahle |
| Programme |
A novel pathway to solving the Hubble tension |
| Instrument |
ALFOSC |
| Time Allocation |
19 hours distributed on 42 monitoring observations. |
| Total Nights |
19h |
| Type |
Monitoring |
| Notes |
Fixed dates to be scheduled |
| Total Time Spent |
00:24 (hh:mm)
|
| Proposal |
Date |
Time |
Type |
Targets |
Files |
Comments |
Status |
|
| 72-510 |
2026-04-04 |
00:00 |
Monitoring |
None |
None |
Night lost due to humidity |
Failed |
|
| 72-510 |
2026-04-05 |
00:00 |
Monitoring |
|
|
Not observed due to high levels of humidity. |
Failed |
|
| 72-510 |
2026-04-07 |
00:24 |
Monitoring |
SDSSJ1004 |
ALJd070130 - ALJd070131 |
The script was aborted after a two exposures since the seeing was well above the set limit |
Failed |
|
The above information is collected from the ToO/Mon reports that have been created by the observer.
Should any of the observations have been carried out using the OB system, you will find additional information
HERE
|
