ETC Request ID: STIS.sp.517595
Exposure time (seconds) = 3,000.0000 at wavelength 2000.00 Å
gives: SNR = 0.4781 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Partial overlap between instrument throughput band and input spectrum.
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 | 7.122e-04 | 4.27 | 2.07 |
| Background | 0.013 | 75.60 | 8.69 |
| Sky | 4.641e-08 | 2.78e-04 | 0.02 |
| Dark Current | 0.013 | 75.60 | 8.69 |
| Total in selected region | 0.013 | 79.87 | 8.94 |
| Brightest Pixel (single exposure) (at 2795.20 Å) | 0.069 | 206.53 | |
| Count rate entire detector | 1,898.432 | ||
| Buffer Time (sec) | |||
| 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 | 10.194 | 30,583.371 | |
| Background (sky+dark) | 1,888.238 | 5,664,712.66 | |
| Encircled energy fraction | 0.84 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | |
| Grating: | [G230L] R ~ 500 |
| Aperture: | 52X0.2 |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: 05ip.txt |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.11 applied before normalization |
| 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 21.2.2
