ETC Request ID: STIS.sp.1354185

Exposure time (seconds) = 2,600.0000 at wavelength 1425.00 Å

gives: SNR = 6.9921 (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 0.012 61.13 7.82
    Background 0.001 5.46 2.34
        Sky 2.171e-14 1.13e-10 1.06e-05
        Dark Current 0.001 5.46 2.34
Total in selected region 0.013 66.59 8.74
Brightest Pixel (single exposure) (at 1320.92 Å) 0.006 14.36
Count rate entire detector 677.086
Buffer Time (sec) 2,953.83
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 313.053 813,937.834
    Background (sky+dark) 157.418 409,287.23
Encircled energy fraction 0.94

Instrument name: STIS
Mode: spectroscopic
Detector: FUVMAMA
Central Wavelength: 1425
Grating: [E140M] R ~ 45800
Aperture: 0.2X0.2
Glow region: low


Target: [point source]
Spectrum: Castelli-Kurucz Models O5V 41000 4.5
Extinction E(B-V): LMC Diffuse (Rv=3.41) = 0.15 applied before normalization
Normalization: Renormalized to vegamag = 13.244 in filter WFC3/UVIS1/F275W
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 27.1