| Image | Band | Note |
| Type | |
| 1.4 GHz |
01 May 05
The image at left shows a GBT Drift scan at
azimuth=203.297 * DEGREE,
elevation=65.855 * DEGREE.
The data were obtained during one hour, taking 18 second integrations,
but with about 20 seconds betweeen integrations.
The data were taken over a 50 MHz band pass with 65536 channels, but
only the spectral range near the galactic HI emission is shown
in the image.
The azimuth, elevation and lst range corresponds to a narrow Declination
range strip centered at 15d57m (J2000) in the Right Ascension range shown.
A
FITS format version of the image is available,
as is a postscript version.
|
| 1.7 GHz |
01 June 15-16
The image at left shows a GBT Drift scan at
azimuth=0.680 * DEGREE,
elevation=65.855 * DEGREE.
The data were obtained over four hours taking 8 second integrations,
but with about 10 seconds betweeen integrations.
The data were taken over a 200 MHz band pass with 8192 channels.
The entire frequency range 1.8 to 1.6 GHz is shown on the X axis.
The Y axis is right ascension of the scan, at declination 50.313 degrees.
The color scale indicates the intensity of emission, increasing
from black, through red, with most intense emission white.
The intensity scale is calibrated in units of Kelvin, and displayed
in the range 0 to 3 Kelvins.
The drift scans in this region correspond to locations in the galactic
plane where a number of radio sources are present.
The bright horizontal strips are continuum radio sources.
The bright vertical strips are RFI (Glonas and Iridium).
The Off (reference) spectrum was calculated from the median of all
spectral data over this time range.
A memo by Glen Langston and Mark Clark describing the
test obsevations is available as a
pdf document.
A FITS format version of the image
is on line.
|
| 1.7 GHz |
01 June 15
One individual 200 MHz wide 1.8 to 1.6 GHz drift scan. The lower curve
is shows a spectrum with CAL Off. The upper curve shows a spectrum
with CAL On. Notice that the spectrum is relatively clean except for
the Glonas RFI at 1.607 MHz (channels 8150 - 8196) and
Iridium at 1.622 to 1.627 MHz (channels 7300 - 7400).
The raw GBT Spectrometer
FITS
format version of this scan
is available.
These spectra are not calibrated, so that the intensity units
are counts.
|
| 1.7 GHz |
01 June 22
The image at left shows a single GBT Drift scan at
azimuth=90.680 * DEGREE,
elevation=77.839 * DEGREE.
The data were obtained over on hour taking 18 second integrations,
but with about 20 seconds betweeen integrations.
The data were taken over a 200 MHz band pass with 8192 channels.
The raw
FITS format version of this scan
is available.
|
| 1.7 GHz |
01 July 27
The image at left shows a calibrated observation of Messier 33
with the GBT. The X axis shows the channel number of a 32767 channel
spectrum covering the frequency range 1425 to 1375 MHz. The Y axis
is intensity (Kelvins).
The complete raw engineering
FITS files are
in directory /home/gbtdata/wtifft.
|