ETC Request ID: STIS.sp.1369103
Exposure time (seconds) = 600.0000 at wavelength 1900.00 Å
gives: SNR = 59.7001 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 166692 exceeds limit for irregularly-variable sources 40 percent of the bright limit 200000 counts per second
WARNING MESSAGE: Buffer time 11.9982 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 7 pix) | (2 pix resel x 7 pix) | |
| Source | 3.333 | 3,999.29 | 63.24 |
| Background | 0.014 | 16.80 | 4.10 |
| Sky | 1.832e-10 | 2.20e-07 | 4.69e-04 |
| Dark Current | 0.014 | 16.80 | 4.10 |
| Total in selected region | 3.347 | 4,016.09 | 66.99 |
| Brightest Pixel (single exposure) (at 2319.00 Å) | 5.659 | 3,395.58 | |
| Count rate entire detector | 166,691.770 | ||
| Buffer Time (sec) | 12.00 | ||
| 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 | 129,602.133 | 77,761,279.873 | |
| Background (sky+dark) | 2,097.152 | 1,258,291.22 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 1978 |
| Grating: | [E230M] R ~ 30000 |
| Aperture: | 0.2X0.2 |
| Target: [point source] | |
| Spectrum: | Flat in units of Fλ |
| Extinction E(B-V): | None |
| Normalization: | Flux 1.5e-11 flam at 1900.0 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 27.2
