ETC Request ID: STIS.im.1012755

Exposure time (seconds) = 500.0000

gives: SNR = 223.1461


Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (circle with radius 0.5 arcsec)
    Source 101.887 50,943.57 225.71
    Background 2.352 1,175.91 34.29
        Sky 0.372 185.91 13.63
        Dark Current 1.980 990.00 31.46
Total in selected region 104.239 52,119.48 228.30
Brightest Pixel (single exposure) 0.079 39.51
Count rate entire detector 8,389.180
Buffer Time (sec) 238.40
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 6,520.778 3,260,388.755
    Background (sky+dark) 1,868.403 934,201.33
Background per unit area
    Sky Background (arcsec-2) 0.473 236.704
    Dark Current (arcsec-2) 2.519 1,259.742
Extraction region
circle with radius 0.5 arcsec
    Effective Sky Area (pixels) 1,319.20
Effective Wavelength 2318.15 Å

Instrument name: STIS
Mode: imaging
Detector: NUVMAMA
Aperture: F25QTZ


Target: [extended source]
Source diameter (arcsec): 8.0
Spectrum: Flat in units of Fν
Extinction E(B-V): None
Normalization: Flux 1.27e-15 flam at 1909.0 Å
Redshift: z=0.02
Emission Lines:
Line at Center 1948.0 Å    FWHM 5.0 Å   Flux 1.27e-14 Fλ


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2