Apertif is a phased-array feed system for the Westerbork Synthesis
Radio Telescope (WSRT), operating at 1.4 GHz and providing forty
instantaneous beams over 300 MHz of bandwidth. This data release
includes the image of the Lockman Hole field observed with Apertif.
The image covers 136 square degree region, has an angular resolution
of 15x13 arcseconds and a median background noise of 27 μJy/beam. The
corresponding source catalog, complete down to the 0.3 mJy level,
includes 55166 sources.
https://science.astron.nl/telescopes/wsrt-apertif/apertif-data-access/data-releases/apertif-single-fields/
Apertif Time Domain FRB detection cone search (DR2)
Short Name:
Detected FRB
Date:
31 Jul 2024 11:50:27
Publisher:
ASTRON
Description:
This is the final, full data release from the Apertif Radio Transient
System (ARTS), a supercomputing radio-telescope instrument that
performed real-time FRB detection and localisation on the Westerbork
Synthesis Radio Telescope (WSRT) interferometer. It reached
coherent-addition sensitivity over the entire field of the view of the
primary- dish beam. The Apertif FRB survey (ALERT) detected 24 new
FRBs, and interferometrically localised each of these to 0.4−10 sq.
arcmin. All detections are broad band and very narrow, of order 1 ms
duration, with high dispersion measures. Please note that the ARTS DR2
collection includes all data from the DR1 collection.
Apertif Time Domain FRB detection cone search (DR1)
Short Name:
Detected FRB
Date:
31 Jul 2024 11:50:09
Publisher:
ASTRON
Description:
This is the first release of data from the Apertif Radio Transient
System (ARTS), a supercomputing radio-telescope instrument that
performs real-time FRB detection and localisation on the Westerbork
Synthesis Radio Telescope (WSRT) interferometer. It reaches
coherent-addition sensitivity over the entire field of the view of the
primary- dish beam. After commissioning results verified the system
performed as planned, we initiated the Apertif FRB survey (ALERT).
Over the first 5 weeks we observed at design sensitivity in 2019, we
detected 5 new FRBs, and interferometrically localised each of these
to 0.4−10 sq. arcmin. All detections are broad band and very narrow,
of order 1 ms duration, and unscattered. Dispersion measures are
generally high. Please note that the ARTS DR1 collection available
from this end-point is superseded by the ARTS DR2 collection. DR2
includes all data from the DR1 collection that can be queried here.
The ARTS DR2 FRB detection cone search can be reached at
https://vo.astron.nl/arts_dr2/q/det_cone/form.
Apertif Time Domain FRB observation cone search (DR2)
Short Name:
Observed FRBs
Date:
31 Jul 2024 11:50:27
Publisher:
ASTRON
Description:
This is the final, full data release from the Apertif Radio Transient
System (ARTS), a supercomputing radio-telescope instrument that
performed real-time FRB detection and localisation on the Westerbork
Synthesis Radio Telescope (WSRT) interferometer. It reached
coherent-addition sensitivity over the entire field of the view of the
primary- dish beam. The Apertif FRB survey (ALERT) detected 24 new
FRBs, and interferometrically localised each of these to 0.4−10 sq.
arcmin. All detections are broad band and very narrow, of order 1 ms
duration, with high dispersion measures. Please note that the ARTS DR2
collection includes all data from the DR1 collection.
Apertif Time Domain FRB observation cone search (DR1)
Short Name:
Observed FRBs
Date:
31 Jul 2024 11:50:09
Publisher:
ASTRON
Description:
This is the first release of data from the Apertif Radio Transient
System (ARTS), a supercomputing radio-telescope instrument that
performs real-time FRB detection and localisation on the Westerbork
Synthesis Radio Telescope (WSRT) interferometer. It reaches
coherent-addition sensitivity over the entire field of the view of the
primary- dish beam. After commissioning results verified the system
performed as planned, we initiated the Apertif FRB survey (ALERT).
Over the first 5 weeks we observed at design sensitivity in 2019, we
detected 5 new FRBs, and interferometrically localised each of these
to 0.4−10 sq. arcmin. All detections are broad band and very narrow,
of order 1 ms duration, and unscattered. Dispersion measures are
generally high. Please note that the ARTS DR1 collection available
from this end-point is superseded by the ARTS DR2 collection. DR2
includes all data from the DR1 collection that can be queried here.
The ARTS DR2 FRB observation cone search can be reached at
https://vo.astron.nl/arts_dr2/q/obs_cone/form.
This service is an extension of the Apparent Places of Fundamental
Stars (APFS) computing exact geocentric positions in both the CIO and
equinox systems to stars from the Gaia DR3 result catalogue.
This service is an extension of the Apparent Places of Fundamental
Stars (APFS) computing exact geocentric positions in both the CIO and
equinox systems to stars from the Gaia DR2 result catalogue.
This service is an extension of the Apparent Places of Fundamental
Stars (APFS) computing exact geocentric positions in both the CIO and
equinox systems to stars from the Hipparcos catalogue.
The archive of AGN spectral observations is obtained on AZT-8
telescope at the Fesenkov Astrophysical Institute (FAI), Almaty,
Kazakhstan. It represents the result of observations for abot 25 years
- from 1970 to 1995. All observations were carried out at AZT-8 (D =
700 mm, F[main] = 2800 mm, F[Cassegrain] = 11000 mm) with a high-power
spectrograph. In 1967-68, on the basis of the image intensifier
(https://doi.org/10.1080/1055679031000084795a) developed and assembled
the spectrograph of the original design in the workshops of the FAI.
