ETC Request ID: STIS.sp.1366575

Requested Signal/Noise Ratio = 0.200 at wavelength 2480.00 Å (per resolution element)

gives: Time = 9,621.0318 seconds


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(counts/s) (counts) (counts)
Counts (box 2 pixels high) (1 pix x 2 pix) (2 pix resel x 2 pix)
    Source 9.622e-05 1.85 1.36
    Background 0.004 83.85 9.16
        Sky 3.575e-04 6.88 2.62
        Dark Current 0.004 76.97 8.77
Total in selected region 0.004 85.70 9.26
Brightest Pixel (single exposure) (at 2484.80 Å) 0.002 21.43
Count rate entire detector 2,101.845
Buffer Time (sec) 951.54
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 0.398 3,833.160
    Background (sky+dark) 2,101.447 20,218,086.87

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength:
Grating: [G230L] R ~ 500
Aperture: 52X0.5


Target: [extended source]
Source diameter (arcsec): 0.4
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Flux 3e-17 flam at 2480.0 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