HETE
High-Energy Transient Experiment
The prime objective of HETE is to carry out the first multiwavelength study of
gamma-ray bursts with UV, X-ray, and gamma-ray instruments mounted on a single,
compact spacecraft. A unique feature of the HETE mission is its capability to
localize GRBs with ~10 arc second accuracy, in near real time aboard the
spacecraft, and to transmit these positions directly to a network of receivers
at existing ground-based observatories, enabling rapid, sensitive follow-up
studies in the radio, IR, and optical bands.
HETE was carried inside the Dual Payload Attach Fixture on which
SAC B
was mounted, so it was trapped and was unable to deploy its solar panels.
Out
of service
|
4
Nov 1996
|
Cause
|
Failed
to separate with the rocket
|
Decay
|
April
2002
|
http://nis-www.lanl.gov/nis-projects/hete/
http://space.mit.edu/HETE/
Build
by
|
CESR
(France)
|
Instrument
type
|
NaI(Tl);
cleaved
|
Energy
range
|
6
keV to > 1 MeV
|
Timing
resolution
|
4
ms
|
Spectral
resolution
|
~40%
@ 6 keV; ~7% @ 1 MeV
|
Effective
area
|
120
cm**2 (total for 4 units)
|
Sensitivity
(10 sigma)
|
3
x 10**-8 erg/cm**2/s for 8-1000 keV
|
FOV
|
~
2 pi sr
|
Angular
resolution
|
~
1 sr
|
Build
by
|
RIKEN
(Japan) and LANL (USA)
|
Instrument
type
|
2
1-dim Coded aperture cameras, with PSPCs
|
Energy
range
|
2
to 25 keV
|
Timing
resolution
|
1
ms
|
Spectral
resolution
|
~18%
@ 6 keV
|
Effective
area
|
200
cm**2 (each of 2 units)
|
Sensitivity
(10 sigma)
|
8
x 10**-9 erg/cm**2/s for 2-10 keV
|
FOV
|
~
2 sr (combined)
|
Angular
resolution (1 sigma)
|
about
10 arcmin (location accuracy better than that)
|
Build
by
|
MIT
(USA)
|
Instrument
type
|
4
UV CCD Detectors with 35 mm f/2 optics
|
Energy
range
|
5
to 7 eV
|
Timing
resolution
|
~
4 s
|
Spectral
resolution
|
n/a
(Broadband imaging photometer)
|
Effective
area
|
2.5
cm**2 (each of 4 units)
|
Sensitivity
(10 sigma)
|
1
x 10**-9 erg/cm**2/s
|
FOV
|
~
1.7 sr (total for 4 units)
|
Angular
resolution (1 sigma)
|
+/-
3 arcsec
|
The spacecraft hardware and software is being developed by Aeroastro (USA).
Downlink frequencies: 137.963 (300 bps) & 2272 MHz