Das GROND-Projekt

1
Gamma-Ray Bursts - an
interesting ToO target for NAHUAL -
Sylvio Klose, Thüringer Landessternwarte
Tautenburg
2
GRBs The basic picture
E 1050 bis 1053 erg
3
Timing is everything
for example
4
Long and short Gamma-Ray Bursts
M gt 5-10 M_sun d gt 100 000 km
M 3 M_sun d lt 100 km
5
satellite
The international GRB alert network
S band
Data andCommands
VLT
Secondary ground stations

• ToO mode
• RRM mode

Internet
Observatories
GCN (Gamma-Ray Burst Coordinate Network)
Control Center
6
GRBs as a pathfinder into the high-z universe
71 GRBs
Sloan Digital Sky Survey 44000 quasars
3.4 Gyr
1.6 Gyr
1 Gyr
7
GRBs as very luminous events
d 800 Mpc !
Peter Schnoor, Kiel, Germany
8
The luminosities of the afterglows
9
Exploring the ISM in cosmologically remote
galaxies
10
GRBs as a pathfinder into the high-z universe
Lyman drop out
z 6.56
z 6.42
z 6.29
GRB 050904
11
GRB 050904 at z6.29
Subaru 8m
12
Outlook What NAHUAL could provide

• confirm high-redshift bursts (z gt 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