ETC Request ID: STIS.sp.1014236
Exposure time (seconds) = 1,722.0000 at wavelength 2026.00 Å
gives: SNR = 82.2493 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 28.6073 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 | 2.153 | 7,413.57 | 86.10 |
| Background | 0.011 | 36.16 | 6.01 |
| Sky | 4.676e-12 | 1.61e-08 | 1.27e-04 |
| Dark Current | 0.011 | 36.16 | 6.01 |
| Total in selected region | 2.163 | 7,449.73 | 90.14 |
| Brightest Pixel (single exposure) (at 2319.51 Å) | 1.912 | 3,291.67 | |
| Count rate entire detector | 69,912.133 | ||
| Buffer Time (sec) | 28.61 | ||
| 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 | 53,810.468 | 92,661,626.664 | |
| Background (sky+dark) | 1,572.864 | 2,708,471.89 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 1978 |
| Grating: | [E230M] R ~ 30000 |
| Aperture: | 31X0.05NDC |
| Target: [point source] | |
| Spectrum: | Castelli-Kurucz Models O7V 37000 4.0 |
| Extinction E(B-V): | Milky Way Diffuse (Rv=3.1) = 0.34 applied before normalization |
| Normalization: | Renormalized to vegamag = 5.13 in filter Johnson/V |
| 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 25.2
