ETC Request ID: STIS.sp.1011707

Exposure time (seconds) = 440.0000 at wavelength 2176.00 Å

gives: SNR = 0.4210 (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 0.002 1.37 1.17
    Background 0.011 9.24 3.04
        Sky 4.206e-07 3.70e-04 0.02
        Dark Current 0.011 9.24 3.04
Total in selected region 0.012 10.61 3.26
Brightest Pixel (single exposure) (at 2475.20 Å) 0.003 1.12
Count rate entire detector 1,576.241
Buffer Time (sec) 1,268.84
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 1.634 719.171
    Background (sky+dark) 1,574.606 692,826.83
Encircled energy fraction 0.85

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 1.9e-17 flam at 2310.0 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 25.2