ETC Request ID: STIS.sp.913391

Exposure time (seconds) = 1,250.0000 at wavelength 2500.00 Å

gives: SNR = 24.9596 (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 pix) (2.0 pix resel x pix)
    Source 0.259 648.21 25.46
    Background 0.011 26.25 5.12
        Sky 7.405e-07 1.85e-03 0.04
        Dark Current 0.011 26.25 5.12
Total in selected region 0.270 674.46 25.97
Brightest Pixel (single exposure) (at 2963.20 Å) 1.995 2,493.96
Count rate entire detector 2,661.497
Buffer Time (sec) 751.46
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 1,086.925 1,358,655.946
    Background (sky+dark) 1,574.572 1,968,214.82
Encircled energy fraction 0.86

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength:
Grating: [G230L] R ~ 500
Aperture: 52X0.2


Target: [point source]
Spectrum: User uploaded spectrum: sn2011fe-visit3-hst.flm
Extinction E(B-V): Milky Way Diffuse (Rv=3.1) = 0.149 applied before normalization
Normalization: Renormalized to vegamag = 12.3 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Earth Shine: Average
    Zodiacal Light: 14:32:41 -44:10:28 3/15/2009 (-4.928131 deg.)
    Air Glow: Average

Table of Source and Noise Counts per Pixel

Plots

These results were computed using: ETC version 25.1.1