ETC Request ID: STIS.sp.1367891

Exposure time (seconds) = 6,000.0000 at wavelength 2900.00 Å

gives: SNR = 13.2657 (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 0.023 281.17 16.77
    Background 0.014 168.06 12.96
        Sky 5.295e-06 0.06 0.25
        Dark Current 0.014 168.00 12.96
Total in selected region 0.037 449.23 21.20
Brightest Pixel (single exposure) (at 2659.20 Å) 0.014 82.17
Count rate entire detector 2,119.669
Buffer Time (sec) 943.54
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 20.799 124,796.614
    Background (sky+dark) 2,098.870 12,593,220.03
Encircled energy fraction 0.87

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


Target: [point source]
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Flux 2.45e-16 flam at 2246.0 Å
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 27.2