EPIC observations of two GRB afterglows

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Presentation transcript:

EPIC observations of two GRB afterglows S.Mereghetti IASF - Milano A.Tiengo, G.Ghisellini, E.Rossi, G.Ghirlanda, N.Schartel, D.Gotz, et al.... EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Discovered by INTEGRAL during calibrations on the Crab GRB 030227 Discovered by INTEGRAL during calibrations on the Crab Position (5 arcmin radius) distributed after 48 min EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Fpeak = 1.1 ph/cm2 s (20-200 keV) Fluence = 8x10-7 erg/cm2 s “X-ray rich” EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

XMM-Newton observation started 8 hr after GRB final INTEGRAL error radius 3 arcmin Fx = 8.5x10-13 erg cm-2 s-1 (0.2-10 keV) EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

X-ray afterglow flux decay Fx a t -1 X-ray afterglow flux decay EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Galactic absorption toward GRB030227 is NH = 1.7 x 1021 cm-2 EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

An additional redshifted absorber is required Photon index 1.94 +/- 0.05 NH =7x1022 cm-2 @ Z=3.9 +/- 0.3 EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Redshift Absorption 68%, 90%, 99% c.l. EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Faint optical afterglow : R = 23.1 @ 12 hr Castro-Tirado et al. 2003, A&A in press, astro-ph/0309804 2.5 m I.Newton Tel. - R band - 1’ x 1’ field - 27 Feb 2003 EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Excluded by lack of Lyman forest blanketing in optical afterglow EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Watson et al. ApJ in press EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

149/123 142.2/149 42/55 93.4/93 73.6/82 EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Power law fit c2=73.6 dof=82 EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Possible line at E=1.67 keV (3.2s F-test) Fe at z = 2.7-3 ? EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

XTE XMM EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

GRB 030329 Extremely bright GRB ( > 10-4 erg cm-2) and second closest (z=0.16) Bright Optical Transient R=12.6 at 1.5 hr Spectral “signature” of a supernova (SN2003dh) (Stanek et al. 2003, Hjorth et al. 2003) Long sought confirmation of GRB-SN connection EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

GRB 030329 afterglow observations To + 5 hr RXTE ( 2 ks ) To + 30 hr RXTE (3.5 ks) To + 9 days RXTE (upper limit) To + 37 days XMM (30 ks net exp.) To + 61 days XMM (40 ks net exp.) EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Tiengo et al. 2003, A&A 409, 983 EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

To + 5 hr To + 30 hr EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

To + 37 days To + 61 days EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

c2 = 63/30 EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

weak hard to soft evolution of prompt emission Conclusions on GRB 030227 weak hard to soft evolution of prompt emission soft gamma ray spectrum, faint OT X-ray afterglow spectrum well fit by power law evidence for intrinsic absorption (a few 1022 cm-2) at z > 1 --> location in star forming region possible line at 1.67 keV (Fe ?) lines from low Z metals ? still debated.... EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Conclusions on GRB 030329 one of the most studied GRBs at all l (brightness and SN association) .... a Rosetta Stone for GRB physics ! A further XMM observation of such an extremely rare event would be very important EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

Current capabilities of Integral Burst Alert System (IBAS : Mereghetti et al. 2003, A&A, astro-ph/0308047) GRB 030501 4 arcmin after 30 s fastest and most accurate GRB localization ever obtained !! EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003

XMM-Newton INTEGRAL “Twin” Spacecrafts --> similar pointing constraints interesting results expected from rapid XMM TOO of real time INTEGRAL triggers EPIC Cons. Meeting S.Mereghetti - Oct. 14, 2003