ETC Request ID: STIS.sp.1035611

Exposure time (seconds) = 12,000.0000 at wavelength 2800.00 Å

gives: SNR = 32.1357 (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 0.052 1,242.59 35.25
    Background 0.011 252.54 15.89
        Sky 2.270e-05 0.54 0.74
        Dark Current 0.011 252.00 15.87
Total in selected region 0.062 1,495.14 38.67
Brightest Pixel (single exposure) (at 2688.00 Å) 0.224 2,683.85
Count rate entire detector 1,720.313
Buffer Time (sec) 1,162.58
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 130.044 1,560,533.401
    Background (sky+dark) 1,590.269 19,083,227.39
Encircled energy fraction 0.87

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength:
Grating: [G230L] R ~ 500
Aperture: 52X2


Target: [point source]
Spectrum: User uploaded spectrum: GD492-9400-550.dat
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 15.5 in filter Johnson/V
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 25.2