ETC Request ID: STIS.sp.824458
Exposure time (seconds) = 220.0000 at wavelength 1380.00 Å
gives: SNR = 30.0341 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 118955 exceeds limit for irregularly-variable sources 40 percent of the bright limit 200000 counts per second
WARNING MESSAGE: Buffer time 16.8131 is less than minimum 99 seconds.
Table of Source and Noise Counts per Pixel
| Detailed Information | Count rate | Total counts | Associated noise |
| (counts/s) | (counts) | (counts) | |
| Counts (box 7 pixels high) | (1 pix x pix) | (2.0 pix resel x pix) | |
| Source | 2.340 | 1,029.46 | 32.09 |
| Background | 0.001 | 0.46 | 0.68 |
| Sky | 2.353e-16 | 1.04e-13 | 3.22e-07 |
| Dark Current | 0.001 | 0.46 | 0.68 |
| Total in selected region | 2.341 | 1,029.92 | 34.28 |
| Brightest Pixel (single exposure) (at 1358.45 Å) | 1.021 | 224.52 | |
| Count rate entire detector | 118,955.078 | ||
| Buffer Time (sec) | 16.81 | ||
| For APT purposes, the recommended buffer time should be 4/5 of the buffer time calculated above. Please refer to the STIS Instrument Handbook for more details. | |||
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| Global Count Rates | |||
| Source only | 71,564.770 | 15,744,249.503 | |
| Background (sky+dark) | 157.410 | 34,630.18 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | FUVMAMA |
| Central Wavelength: | 1380 |
| Grating: | [E140H] R ~ 114000 |
| Aperture: | 31X0.05NDA |
| Glow region: | low |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: cuvir.dat |
| Extinction E(B-V): | None |
| Normalization: | None |
| Redshift: | None |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 24.2
