Achromatic breaks for Swift GRBs. Any evidence? Stefano Covino (INAF/OAB), Daniele Malesani (SISSA), Susanna Vergani (Dunsink), Giampiero Tagliaferri (INAF/OAB), on behalf of the MISTICI collaboration

Venice, 6 June 2006 Zhang et al. (2006); many others…

Venice, 6 June 2006 Ghirlanda & Ghisellini (2006)

Venice, 6 June 2006 The prototype: GRB Stanek et al. 2000

Venice, 6 June 2006 Sari 2000

Venice, 6 June 2006 Frail et al. 2001

Venice, 6 June 2006 Panaitescu et al. (2006); Panaitescu (talk)

Venice, 6 June 2006 Blustin et al. (2006) Della Valle et al. (2006)

Venice, 6 June 2006 GRB ; Rykoff et al. (2006)

Venice, 6 June 2006 short GRB ; Soderberg et al. (2006); Fox (talk)

Venice, 6 June 2006 GRB ; Kann et al. (in preparation); Romano (talk); Curran et al. (poster)

Venice, 6 June 2006 GRB ; Moretti et al. (poster); Halpern et al. (2006)

Venice, 6 June 2006 Summing up, most of the Swift GRBs do not show achromatic breaks; in a few cases, however, achromatic breaks can be singled out; pre-Swift: E peak, good optical, poor X-ray coverage; Swift: no E peak, X-ray coverage optimal, good optical, complex light-curves Future: best use of the few good events. Is it time to think to worlwide coordination for optical?

Venice, 6 June 2006