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ENR CTIO Blanco 4-m 2022-09-05

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Date: 
Monday, September 5, 2022
Telescope: 
CTIO Blanco 4-m
Submitter: 
Guillermo Damke
Submitter Email: 
guillermo.damke@noirlab.edu
Observer Support: 
Manuel Hernandez
Night Assistant: 
Claudio Aguilera
Also Present: 
Rodrigo Hernandez
Problems: 

This is the first night after replacing some fibers/machines during the afternoon.

We had slightly elliptical/irregular PSF at the beginning of the night. The problem lasted for ~10 minutes and was fixed by itself (images 1130828 through 1130838).

We had readout-related problems in five images:

1130918: detectors N4,N5,N6,N7 and S4, S5, S6 and S7 have zero counts (seen in a "bigload")

1130919: running bigload gives the following message: "hdu 53 can't read "HDU(53)": no such element in array

It was not clear what caused the problem and neither how/why it was fixed in the subsequent images with no action from the operators. However, the problem seen in image 918 appeared once more in image 1130942. At this point, Rodrigo, Manuel and Claudio restarted SISPI (00:54 local time). The problem did not appear after this action (at least in the images checked). We checked the Alarm history and there were alerts produced in the three cases. In fact, a similar alert was found for image 1130750 (afternoon calibration).

 

Comments: 

None.

Conditions: 
General Conditions
Comment: 
None.
1st Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.90
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky : 
0
2nd Quarter
Clouds: 
Clear
Wind: 
Low
Seeing Value: 
0.90
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
3rd Quarter
Clouds: 
Clear
Wind: 
Medium
Seeing Value: 
1.00
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
4th Quarter
Clouds: 
Clear
Wind: 
Medium
Seeing Value: 
1.10
Seeing Variability: 
0.2
Seeing Source: 
The Telescope I used
Sky: 
0
Program: 
Proposal: 
2020A-0058
Target of Oportunity: 
No
Time Observed: 
10.25
Time Engineering: 
0.0
Time lost technical: 
0.5
Time lost weather: 
0.0
Time lost other: 
0.0
Description: 
Sgr tidal tails (using ID borrowed from Vivas for Crater II proposal)
Primary Investigator: 
Vivas
Email: 
kathy.vivas@noirlab.edu
Institution: 
NOAO
Instrument: 
CTIO 4m DECam
Total Program Time: 
10.75
Total Times Time Observed Time Engineering Time lost technical Time lost weather Time lost other Total Program Time
2022-09-05 10.25 0.0 0.5 0.0 0.0 10.75