ETC Request ID: STIS.im.1007329

Exposure time (seconds) = 1,000.0000

gives: SNR = 229.0152


Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (circle with radius 0.5 arcsec)
    Source 54.432 54,431.89 233.31
    Background 2.059 2,058.99 45.38
        Sky 0.079 78.99 8.89
        Dark Current 1.980 1,980.00 44.50
Total in selected region 56.491 56,490.88 237.68
Brightest Pixel (single exposure) 0.043 42.82
Count rate entire detector 5,119.294
Buffer Time (sec) 390.68
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 3,483.641 3,483,640.906
    Background (sky+dark) 1,635.653 1,635,652.63
Background per unit area
    Sky Background (arcsec-2) 0.101 100.578
    Dark Current (arcsec-2) 2.519 2,519.484
Extraction region
circle with radius 0.5 arcsec
    Effective Sky Area (pixels) 1,319.20
Effective Wavelength 1980.24 Å

Instrument name: STIS
Mode: imaging
Detector: NUVMAMA
Aperture: F25CN182


Target: [extended source]
Source diameter (arcsec): 8.0
Spectrum: Flat in units of Fν
Extinction E(B-V): None
Normalization: Flux 4.9e-15 flam at 1909.0 Å
Redshift: z=0.00036
Emission Lines:
Line at Center 1909.8 Å    FWHM 1.0 Å   Flux 3.9e-14 Fλ


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2