1. Fundamental Properties of GRB-Selected Galaxies: A Swift/VLT Legacy Survey Palli Jakobsson Centre for Astrophysics Research (University of Hertfordshire)

2. Main Collaborators Jens Hjorth (DARK, NBI) [PI] Johan Fynbo (DARK, NBI) Javier Gorosabel (IAA-CSIC, Granada) Nial Tanvir (CAR, Herts) Andrew Levan (CAR, Herts) Paul Vreeswijk (ESO) Rhaana Starling (Amsterdam) Gulli Björnsson (Science Institute, Reykjavík) Cedric Ledoux (ESO) Evert Rol (Leicester) Andreas Jaunsen (Oslo)

3. Concrete Goals (LP: 272 hours) Identify the GRB hosts: R = 27 and K = 21.5 [17]. Measure redshifts for GRBs without absorption redshifts [4]. Search for the Ly α line when possible [7]. Determine the dust reddening within hosts. Detailed studies (spectroscopy) of particularly interesting targets: short GRB hosts [3] and bright hosts [1]. Determine the luminosity function.

4. Redshift Distribution of Swift GRBs Jakobsson et al. (2006)

5. Sample Definition GRBs detected by Swift after 1 March 2005, when it was fully operational and automatically slewing. An X-ray position is available obtained by the Swift XRT detector. The Galactic extinction is less than A V < 0.5. Declination favorable for VLT (< +25º).

6. LF: GRB Hosts vs. LBGs (z ~ 3) Blue: GRB hosts Black: LBGs R*  LBGs: 24.54 -1.57 Hosts: 24.60 -1.55 Jakobsson et al. (2005) ULIRGs ??? < 30% ???

7. LF: GRB Hosts vs. LBGs (z ~ 3) 36 detections (24 < R < 28) 10 upper limits (R > 28) 8 detections 7 upper limits

8. GRB 050315 R = 24.6

9. GRB 050318

10. GRB 030429 A galaxy only 1.2” away from the OA  initially considered to be a probable host galaxy. VLT spectroscopy soon showed: z GRB = 2.66 z galaxy = 0.84

11. GRB 050318

12. GRB 050401 R = 25.7

13. GRB 050406

14. GRB 050412 R ~ 27 (β OX < 0.05)

15. GRB 050416A R = 23.1 XRF Short? Cluster

16. GRB 050502B

17. GRB 050603 R = 26.1

18. GRB 050714B X-ray lines: z ~ 2.5 ??

19. GRB 050726 R = 25.3

20. GRB 050730 R = 26.9

21. GRB 050801 R = 26.3

22. GRB 050820A R = 24.7

23. GRB 050822 R = 24.1 X-ray lines: z ~ 2.5 ??

24. GRB 050915A R = 24.5

25. GRB 050922C

26. GRB 051006

27. GRB 051016B R = 22.6

28. GRB 051117B R = 24.1

29. LF: GRB Hosts vs. LBGs (z ~ 3)

30. Mosaic