ETC Request ID: STIS.sp.1006787

Exposure time (seconds) = 1,759.0000 at wavelength 1347.00 Å

gives: SNR = 44.3240 (per resolution element)

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: Buffer time 52.3973 is less than minimum 99 seconds.


Table of Source and Noise Counts per Pixel

Plots

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 0.650 2,286.66 47.82
    Background 0.001 3.69 1.92
        Sky 6.974e-17 2.45e-13 4.95e-07
        Dark Current 0.001 3.69 1.92
Total in selected region 0.651 2,290.35 51.59
Brightest Pixel (single exposure) (at 1320.00 Å) 0.257 451.42
Count rate entire detector 38,169.925
Buffer Time (sec) 52.40
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.
Global Count Rates
    Source only 22,229.659 39,101,970.448
    Background (sky+dark) 157.336 276,753.89
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1343
Grating: [E140H] R ~ 114000
Aperture: 31X0.05NDB
Glow region: low


Target: [point source]
Spectrum: Bruzual Synthetic Stellar Spectra B2 V
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.2 applied before normalization
Normalization: Renormalized to vegamag = 6.733 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 25.2