ETC Request ID: STIS.sp.1367600

Exposure time (seconds) = 500.0000 at wavelength 4000.00 Å

gives: SNR = 106.7695 (per resolution element)

gives: Time to Saturation (for a single exposure) = 4,414.45 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (6.5) is less than the recommended threshold of 20 electrons to avoid poor charge transfer efficiency (CTE). We suggest you consider CTE mitigation strategies described in the STIS Instrument Handbook."


Table of Source and Noise Counts per Pixel

Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box 7 pixels high) (1 pix x 7 pix) (2 pix resel x 7 pix)
    Source 12.515 12,514.61 111.87
    Background 0.182 182.03 13.49
        Sky 3.171e-05 0.03 0.18
        Dark Current 0.182 182.00 13.49
    Read Out 32.28
Total in selected region 12.697 12,696.65 117.21
Brightest Pixel (single exposure) (at 4057.04 Å) 7.475 1,868.86
Global Count Rates
    Source only 13,233.837 6,616,918.318
    Background (sky+dark) 27,266.325 13,633,162.67
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength: 3936
Grating: [G430M] R ~ 6000
Aperture: 52X0.1
Gain: 1.0
# Frames: 2
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: User uploaded spectrum: R136SED_PoWR_08-09.txt
Extinction E(B-V): Milky Way CCM (Rv=4.0) = 0.45 applied before normalization
Normalization: Renormalized to vegamag = 12.2 in filter ACS/WFC1/F555W
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