Participation of HEND in the Program of Interplanetary Network of localization of cosmic gammaray bu

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Participation of HEND in the Program of
Interplanetary Network of localization of cosmic
gamma-ray bursts
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What is Gamma-Ray Burst?
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Gamma-Ray Burst Coordinate Network
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Participations in GCN

• Ulysses, heliocentric orbit,
• 650 light sec from Earth
• HEND, Mars orbit, 1200
• light sec from Earth
• Spacecrafts near Earth,
• WIND (KONUS experiment)
• HETE-2
• BeppoSax ( up to end of April
• 2002)

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Gamma-Ray Burst HEND Subsystem

• Size of CsI crystal
• - height 5.5 cm
• - external diameter 5.5 cm
• wall thickness 1 cm
• Resolution
• 0.25 sec, 1 sec.
• Spectral range
• from 39keV up to 1.2MeV
• Continue data flow

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HEND counterpart to IPN Time Profile and
Interplanetary Point
Event
TIME Position of S/C
THEND
TCEB
TUT
Odyssey Coordinate
Odyssey SPICE support
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HEND autoburst data distribution system
Event
HEND
CEB
Odyssey
Data Request
JPL
UofA
Distribution to community
IKI
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GRB020405
Error Box for GRB020405

• Observed by Ulysses, Mars Odyssey (HEND),
  BeppoSAX, and Wind
• Triangulated to a 75 square arcminute error box
  and circulated to astronomers within 17 hours
• Optical transient source identified less than one
  hour later

Ulysses/HEND
Ulysses/BeppoSax
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Optical counterpart for GRB020405
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Statistic of of HEND Gamma Ray-Bursts
Free space Cruise stage
Orbital Stage
16 detected GRB (4 events/month)
9 detected GRB (2events/month)
3 events localized
5 events localized
3 have optical afterglow
3 have optical afterglow
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Temporal properties of HEND Gamma-Ray Bursts

• time duration distribution of long
• GRB in a good agreement with
• BATSE GRB time duration
• distribution
• there is a absence of short GRB in
• common HEND KONUS events

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Conclusions

• HEND is the member of Interplanetary Gamma-Ray
  Burst Coordinate Network
• during the year of operation 25 GRB were
  detected
• 8 GRB were localized
• GRB part of HEND work became more important
  after finish of BeppoSax scientific operation
  stage in the end of April 2002
• farther development of HEND burst facility is
  necessary for own HEND GRB triggering.