ETC Request ID: STIS.sp.1003290

Requested Signal/Noise Ratio = 200.000 at wavelength 4000.00 Å (per resolution element)

gives: Time = 1,352.0926 seconds

gives: Time to Saturation (for a single exposure) = 3,505.43 seconds

Exposure time calculation HAD WARNINGS.

WARNING MESSAGE: "Electrons per pixel due to background (12) 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 15.299 41,371.46 203.40
    Background 0.127 342.16 18.50
        Sky 5.292e-04 1.43 1.20
        Dark Current 0.126 340.73 18.46
    Read Out 32.81
Total in selected region 15.426 41,713.61 206.86
Brightest Pixel (single exposure) (at 4568.60 Å) 9.414 6,364.28
Global Count Rates
    Source only 12,577.060 17,005,350.775
    Background (sky+dark) 18,955.825 25,630,031.03
Encircled energy fraction 0.93

Instrument name: STIS
Mode: spectroscopic
Detector: CCD
Central Wavelength:
Grating: [G430L] R ~ 500
Aperture: 52X0.2
Gain: 1.0
# Frames: 2
Binning: dispersion: 1, spatial: 1
Dark: medium


Target: [point source]
Spectrum: User uploaded spectrum: SN2015F_full_20150326.dat
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 14.5 in filter Johnson/V
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