ETC Request ID: STIS.sp.835733
Exposure time (seconds) = 745.0000 at wavelength 2796.00 Å
gives: SNR = 80.9740 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: MAMA Bright limits: total count rate per image 83618.2 exceeds limit for irregularly-variable sources 40 percent of the bright limit 200000 counts per second
WARNING MESSAGE: Buffer time 23.9182 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 | 4.530 | 6,749.37 | 82.15 |
| Background | 0.011 | 15.65 | 3.96 |
| Sky | 1.095e-10 | 1.63e-07 | 4.04e-04 |
| Dark Current | 0.011 | 15.65 | 3.96 |
| Total in selected region | 4.540 | 6,765.02 | 83.35 |
| Brightest Pixel (single exposure) (at 2796.21 Å) | 6.714 | 5,001.93 | |
| Count rate entire detector | 83,618.214 | ||
| Buffer Time (sec) | 23.92 | ||
| 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 | 74,182.054 | 55,265,630.258 | |
| Background (sky+dark) | 1,572.865 | 1,171,784.59 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2862 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 31X0.05NDA |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: ALPCEN-B-UV.dat |
| 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 24.2
