ETC Request ID: STIS.sp.1167787
Exposure time (seconds) = 2,378.0000 at wavelength 2246.00 Å
gives: SNR = 27.2435 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Partial overlap between instrument throughput band and target spectrum. Please doublecheck the wavelength range covered by the selected spectrum, and the instrument documentation for the selected filter.
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 | 0.166 | 789.17 | 28.09 |
| Background | 0.011 | 49.94 | 7.07 |
| Sky | 6.720e-07 | 3.20e-03 | 0.06 |
| Dark Current | 0.011 | 49.94 | 7.07 |
| Total in selected region | 0.176 | 839.12 | 28.97 |
| Brightest Pixel (single exposure) (at 2563.20 Å) | 0.255 | 607.38 | |
| Count rate entire detector | 1,811.901 | ||
| Buffer Time (sec) | 1,103.81 | ||
| 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 | 237.316 | 564,336.859 | |
| Background (sky+dark) | 1,574.585 | 3,744,363.12 | |
| Encircled energy fraction | 0.85 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | |
| Grating: | [G230L] R ~ 500 |
| Aperture: | 52X0.2 |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: Gaia16apd_UV.txt |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.207 applied before normalization |
| Normalization: | Flux 1.76e-15 flam at 2246.0 Å |
| Redshift: | z=0.026 |
| Emission Lines: | None |
| Selected background: | |
| Sky Background: | |
| Level: |
Table of Source and Noise Counts per Pixel
These results were computed using: ETC version 26.1
