ETC Request ID: STIS.sp.431289
Exposure time (seconds) = 1.0000 at wavelength 2500.00 Å
gives: SNR = 8.6570 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 34746.4 exceeds bright limit 30000
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 | 37.485 | 74.97 | 8.66 |
| Background | 0.013 | 0.03 | 0.16 |
| Sky | 6.741e-04 | 1.35e-03 | 0.04 |
| Dark Current | 0.013 | 0.03 | 0.16 |
| Total in selected region | 37.498 | 75.00 | 8.66 |
| Brightest Pixel (single exposure) (at 2249.60 Å) | 17.011 | 17.01 | |
| Count rate entire detector | 34,746.410 | ||
| 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 | 32,849.087 | 32,849.087 | |
| Background (sky+dark) | 1,897.323 | 1,897.32 | |
| Encircled energy fraction | 0.86 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | |
| Grating: | [G230L] R ~ 500 |
| Aperture: | 52X2 |
| Target: [point source] | |
| Spectrum: | Standard HST Star Spectra GD153 (DA1, 13.346) |
| 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 20.2
