ETC Request ID: STIS.sp.1398606

Exposure time (seconds) = 2,700.0000 at wavelength 1425.00 Å

gives: SNR = 9.4283 (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 0.020 107.88 10.39
    Background 0.001 5.67 2.38
        Sky 2.137e-14 1.15e-10 1.07e-05
        Dark Current 0.001 5.67 2.38
Total in selected region 0.021 113.55 11.44
Brightest Pixel (single exposure) (at 1344.93 Å) 0.008 20.76
Count rate entire detector 950.614
Buffer Time (sec) 2,103.90
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 477.828 1,290,136.303
    Background (sky+dark) 157.418 425,028.77
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 O3V 45000 4.5
Extinction E(B-V): LMC Diffuse (Rv=3.41) = 0.4 applied before normalization
Normalization: Renormalized to vegamag = 11.932 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 28.1