ETC Request ID: STIS.sp.1341238
Exposure time (seconds) = 500.0000 at wavelength 1550.00 Å
gives: SNR = 20.5298 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 93.6039 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 7 pix) | (2 pix resel x 7 pix) | |
| Source | 0.457 | 456.61 | 21.37 |
| Background | 0.001 | 1.05 | 1.02 |
| Sky | 1.629e-13 | 1.63e-10 | 1.28e-05 |
| Dark Current | 0.001 | 1.05 | 1.02 |
| Total in selected region | 0.458 | 457.66 | 22.24 |
| Brightest Pixel (single exposure) (at 1498.70 Å) | 0.211 | 105.60 | |
| Count rate entire detector | 21,366.642 | ||
| Buffer Time (sec) | 93.60 | ||
| 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 | 11,221.830 | 5,610,914.975 | |
| Background (sky+dark) | 157.286 | 78,643.20 | |
| Encircled energy fraction | 0.94 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | FUVMAMA |
| Central Wavelength: | 1598 |
| Grating: | [E140H] R ~ 114000 |
| Aperture: | 0.2X0.2 |
| Glow region: | low |
| Target: [point source] | |
| Spectrum: | Flat in units of Fλ |
| Extinction E(B-V): | None |
| Normalization: | Flux 1.5e-11 flam at 5500.0 Å |
| 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 27.1
