ETC Request ID: STIS.sp.1366576

Requested Signal/Noise Ratio = 0.200 at wavelength 2543.00 Å (per resolution element)

gives: Time = 4,741.3916 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 1.320e-04 1.25 1.12
    Background 0.004 37.94 6.16
        Sky 5.879e-07 5.57e-03 0.07
        Dark Current 0.004 37.93 6.16
Total in selected region 0.004 39.19 6.26
Brightest Pixel (single exposure) (at 2484.80 Å) 0.002 10.64
Count rate entire detector 2,101.978
Buffer Time (sec) 951.48
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 0.531 2,518.720
    Background (sky+dark) 2,101.447 9,963,782.44

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 4e-17 flam at 2543.0 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