ETC Request ID: STIS.sp.916565

Exposure time (seconds) = 2,770.0000 at wavelength 2760.00 Å

gives: SNR = 36.8361 (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 pix) (2.0 pix resel x pix)
    Source 0.262 1,451.48 38.10
    Background 0.011 58.17 7.63
        Sky 2.974e-09 1.65e-05 4.06e-03
        Dark Current 0.011 58.17 7.63
Total in selected region 0.272 1,509.65 39.40
Brightest Pixel (single exposure) (at 2698.65 Å) 0.112 310.25
Count rate entire detector 8,942.628
Buffer Time (sec) 223.65
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 6,419.658 17,782,452.465
    Background (sky+dark) 1,572.864 4,356,833.46
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Central Wavelength: 2762
Grating: [E230H] R ~ 114000
Aperture: 0.2X0.09


Target: [point source]
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Flux 1.3e-12 flam at 2760.0 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 25.1.1