ETC Request ID: STIS.sp.1184232
Exposure time (seconds) = 500.0000 at wavelength 2800.00 Å
gives: SNR = 23.7634 (per resolution element)
Exposure time calculation HAD WARNINGS.
WARNING MESSAGE: Buffer time 33.1796 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 | 0.590 | 589.87 | 24.29 |
| Background | 0.011 | 10.50 | 3.24 |
| Sky | 3.373e-12 | 3.37e-09 | 5.81e-05 |
| Dark Current | 0.011 | 10.50 | 3.24 |
| Total in selected region | 0.600 | 600.37 | 24.82 |
| Brightest Pixel (single exposure) (at 2700.61 Å) | 1.464 | 732.20 | |
| Count rate entire detector | 60,277.960 | ||
| Buffer Time (sec) | 33.18 | ||
| 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 | 50,218.250 | 25,109,124.756 | |
| Background (sky+dark) | 1,572.864 | 786,432.00 | |
| Encircled energy fraction | 0.93 | ||
| Instrument name: | STIS |
| Mode: | spectroscopic |
| Detector: | NUVMAMA |
| Central Wavelength: | 2713 |
| Grating: | [E230H] R ~ 114000 |
| Aperture: | 0.2X0.05ND |
| Target: [point source] | |
| Spectrum: | User uploaded spectrum: h_alp-cmi_uvsum_1x_52720-55864_etc.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 26.1
