1

Gamma-Ray Bursts - an interesting ToO target for NAHUAL -

Sylvio Klose, Thüringer Landessternwarte Tautenburg

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GRBs: The basic picture

E ~ 10^50 bis 10^53 erg

3

for example:

Timing is everything

4

Long and short Gamma-Ray Bursts

M > 5-10 M_sund > 100 000 km

M ~ 3 M_sund < 100 km

5

satellite

Gamma-Ray Burst

S band

Data andCommands

Control Center

Observatories

VHF

Localization Alerts

Internet

GCN (Gamma-Ray BurstCoordinate Network)

Internet

Secondary ground stations

The international GRB alert network

• ToO mode• RRM mode

VLT

6

Sloan Digital Sky Survey44000 quasars

71 GRBs

1 Gyr

1.6

Gyr

3.4

Gyr

GRBs as a pathfinder into the high-z universe

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GRBs as very luminous events

Peter Schnoor, Kiel,Germany

d = 800 Mpc !

8

The luminosities of the afterglows

9

Exploring the ISM in cosmologically remote galaxies

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GRBs as a pathfinder into the high-z universe

Lyman drop out

GRB 050904

z = 6.56z = 6.42 z = 6.29

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GRB 050904 at z=6.29

Subaru 8m

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Outlook: What NAHUAL could provide

• confirm high-redshift bursts (z > 7)

• search for variable spectral lines

• search for signals from the GRB progenitor

• probe the reionization of the universe

All this with a potentially small amount of observing time.

timing is everything