ETC Request ID: STIS.ta.1442641

Exposure time (seconds) = 3.0000

gives: SNR = 56.6199

gives: Time to Saturation (for a single exposure) = 168.10 seconds


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Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 1,261.204 3,783.61 61.51
    Background 0.244 0.73 0.86
        Sky 0.001 3.13e-03 0.06
        Dark Current 0.243 0.73 0.85
    Read Out 26.10
Total in selected region 1,261.448 3,784.34 66.82
Brightest Pixel (single exposure) 713.842 2,141.53
Global Count Rates
    Source only 2,522.408 7,567.223
    Background (sky+dark) 28,377.923 85,133.77
Background per unit area
    Sky Background (arcsec-2) 0.046 0.139
    Dark Current (arcsec-2) 10.800 32.400
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
    Fraction of flux 0.50
    Fraction of flux in brightest pixel 0.28
Effective Wavelength 3739.43 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50OII
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: User uploaded spectrum: av187_ebv0.06_sed_unorm.fits
Extinction E(B-V): None
Normalization: None
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

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These results were computed using: ETC version 28.2