ETC Request ID: STIS.sp.918692
Requested Signal/Noise Ratio = 100.000 at wavelength 2100.00 Å (per resolution element)
gives: Time = 2,698.3717 seconds
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 80359.5 exceeds limit for irregularly-variable sources 40 percent of the bright limit 200000 counts per second
WARNING MESSAGE: Buffer time 24.8882 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 pix) | (2.0 pix resel x pix) | |
| Source | 2.009 | 10,843.16 | 104.13 |
| Background | 0.011 | 56.67 | 7.53 |
| Sky | 1.857e-10 | 1.00e-06 | 1.00e-03 |
| Dark Current | 0.011 | 56.67 | 7.53 |
| Total in selected region | 2.020 | 10,899.83 | 108.43 |
| Brightest Pixel (single exposure) (at 2126.34 Å) | 0.956 | 2,578.90 | |
| Count rate entire detector | 80,359.475 | ||
| Buffer Time (sec) | 24.89 | ||
| 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 | 53,852.868 | 145,315,051.143 | |
| Background (sky+dark) | 1,572.864 | 4,244,171.64 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2013 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 0.2X0.09 |
| Target: [point source] | |
| Spectrum: | Flat in units of Fλ |
| Extinction E(B-V): | None |
| Normalization: | Flux 2.4e-11 flam at 2100.0 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 25.1.1
