ETC Request ID: STIS.sp.1014906

Exposure time (seconds) = 2,950.0000 at wavelength 1215.67 Å

gives: SNR = 0.0064 (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 5.037e-06 0.03 0.17
    Background 0.004 21.51 4.64
        Sky 0.003 15.31 3.91
        Dark Current 0.001 6.20 2.49
Total in selected region 0.004 21.54 4.64
Brightest Pixel (single exposure) (at 1215.09 Å) 0.051 150.33
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 21,982.386
    Background (sky+dark) 157.326 464,111.79
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