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ENR CTIO Blanco 4-m 2025-05-25

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Date: 
Sunday, May 25, 2025
Telescope: 
CTIO Blanco 4-m
Submitter: 
Yifei Luo
Submitter Email: 
yifeiluo@lbl.gov
Observer Support: 
Alfredo Zenteno
Night Assistant: 
Claudio Aguilera
Also Present: 
Jaime Forero
Problems: 

1. In the begining of the night, the exposures were not synced between computers. The afternoon calibration files for tonight were both on observer2 and obsever4, but the first ~20 science exposures can only be found on observer2. not observer4. This cuased a problem to decbot/ETC since they are running on observer4 and need access to the exposures in order to adjust the exposure time. The issue was solved by restarted SISPI.

2. The guding failed around 22:00 local time. We first tried to fix it by adjusting the guider exptime from the default 1500ms to 2000ms and 1200ms but it did not help. We then restarted SISPI again and also restarted the ETC, decbot and copilot. The guider started to work.

3. We lost guding again around 03:45 local time. We tried to only restart the guider but it did not work. We then restarted SISPI again and  also restarted the ETC, decbot and copilot. This time it did not work. We manually added a 60s exposure with r-band filter and it still not guiding. We then restarted SISPI again, but did not turned on the ETC/decbot this time. We manually loaded the json files through observer console. The guider started to work stably this time.

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
1.50
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
1
2nd Quarter
Clouds: 
Clear
Wind: 
Medium
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
1
4th Quarter
Clouds: 
Thin Clouds
Wind: 
Low
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
2
Program: 
Proposal: 
2023B-184194
Target of Oportunity: 
No
Time Observed: 
10.5
Time Engineering: 
0.0
Time lost technical: 
1.5
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
IBIS survey
Primary Investigator: 
Arjun Dey
Email: 
arjun.dey@noirlab.edu
Institution: 
Noirlab
Instrument: 
CTIO 4m DECam
Organization: 
NOAO
Total Program Time: 
12
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2025-05-25 10.5 0.0 1.5 0.0 0.0 12