ETC Request ID: STIS.sp.1298760
Exposure time (seconds) = 505.0000 at wavelength 2497.00 Å
gives: SNR = 54.7822 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 15.502 is less than minimum 99 seconds.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 129016 exceeds limit for irregularly-variable sources 40 percent of the bright limit 200000 counts per second
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 | 3.071 | 3,101.81 | 55.69 |
| Background | 0.014 | 14.14 | 3.76 |
| Sky | 1.569e-10 | 1.58e-07 | 3.98e-04 |
| Dark Current | 0.014 | 14.14 | 3.76 |
| Total in selected region | 3.085 | 3,115.95 | 56.62 |
| Brightest Pixel (single exposure) (at 2875.01 Å) | 5.718 | 2,887.73 | |
| Count rate entire detector | 129,015.830 | ||
| Buffer Time (sec) | 15.50 | ||
| 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 | 100,729.149 | 50,868,220.484 | |
| Background (sky+dark) | 2,097.161 | 1,059,066.21 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2561 |
| Grating: | [E230M] R ~ 30000 |
| Aperture: | 31X0.05NDB |
| Target: [point source] | |
| Spectrum: | Kurucz Models F5V 6440 4.3 |
| Extinction E(B-V): | None |
| Normalization: | Renormalized to abmag = 13.44 in filter Galex/FUV |
| 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 26.2
