ETC Request ID: STIS.sp.1363960

Requested Signal/Noise Ratio = 10.000 at wavelength 2450.00 Å (per resolution element)

gives: Time = 1,436.2460 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 0.039 111.75 10.57
    Background 0.005 13.13 3.62
        Sky 5.711e-04 1.64 1.28
        Dark Current 0.004 11.49 3.39
Total in selected region 0.043 124.88 11.17
Brightest Pixel (single exposure) (at 2762.69 Å) 0.030 42.72
Count rate entire detector 2,192.851
Buffer Time (sec) 912.05
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 11.071 15,899.967
    Background (sky+dark) 2,181.780 3,133,573.17

Instrument name: STIS
Mode: spectroscopic
Detector: NUVMAMA
Disperser: Objective Prism
Aperture: 52X0.5


Target: [extended source]
Source diameter (arcsec): 0.4
Spectrum: Flat in units of Fλ
Extinction E(B-V): None
Normalization: Renormalized to abmag = 18.75 in filter Galex/NUV
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