ETC Request ID: STIS.sp.824675
Exposure time (seconds) = 100.0000 at wavelength 1600.00 Å
gives: SNR = 28.9991 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 15034.9 exceeds limit for irregularly-variable sources 40 percent of the bright limit 30000 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 pix) | (2.0 pix resel x pix) | |
| Source | 4.206 | 841.16 | 29.00 |
| Background | 0.001 | 0.21 | 0.46 |
| Sky | 5.486e-10 | 1.10e-07 | 3.31e-04 |
| Dark Current | 0.001 | 0.21 | 0.46 |
| Total in selected region | 4.207 | 841.37 | 29.01 |
| Brightest Pixel (single exposure) (at 1314.90 Å) | 7.878 | 787.79 | |
| Count rate entire detector | 15,034.917 | ||
| Buffer Time (sec) | 133.02 | ||
| 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 | 13,730.556 | 1,373,055.554 | |
| Background (sky+dark) | 1,304.361 | 130,436.12 | |
| Encircled energy fraction | 0.84 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | FUVMAMA |
| Central Wavelength: | |
| Grating: | [G140L] R ~ 1000 |
| Aperture: | 52X2 |
| Glow region: | low |
| Target: [point source] | |
| Spectrum: | Kurucz Models O9V 33000. 4.0 |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.25 applied before normalization |
| Normalization: | Renormalized to vegamag = 11.85 in filter Johnson/U |
| 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 24.2
