ETC Request ID: STIS.sp.1014915

Exposure time (seconds) = 1,418.0000 at wavelength 1216.00 Å

gives: SNR = 4.5669 (per resolution element)


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 0.011 31.88 5.65
    Background 0.001 2.98 1.73
        Sky 2.431e-14 6.89e-11 8.30e-06
        Dark Current 0.001 2.98 1.73
Total in selected region 0.012 34.86 6.98
Brightest Pixel (single exposure) (at 1215.09 Å) 0.051 72.26
Count rate entire detector 169.696
Buffer Time (sec) 11,785.80
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 7.452 10,566.449
    Background (sky+dark) 157.326 223,088.31
Encircled energy fraction 0.88

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1425
Grating: [E140M] R ~ 45800
Aperture: 0.2X0.06
Glow region: low


Target: [point source]
Spectrum: User uploaded spectrum: GJ699_lyman_alpha_spectrum.txt
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

Plots

These results were computed using: ETC version 25.2