1. 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
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2. EPIC Cons. Meeting
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3. Discovered by INTEGRAL during calibrations on the Crab
GRB
Discovered by INTEGRAL during calibrations on the Crab
Position (5 arcmin radius)
distributed after 48 min
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4. EPIC Cons. Meeting
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5. Fpeak = 1.1 ph/cm2 s (20-200 keV) Fluence = 8x10-7 erg/cm2 s
“X-ray rich”
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6. XMM-Newton observation started 8 hr after GRB
final INTEGRAL
error radius 3 arcmin
Fx = 8.5x erg cm-2 s-1 ( keV)
EPIC Cons. Meeting
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7. X-ray afterglow flux decay
Fx a t -1
X-ray afterglow flux decay
EPIC Cons. Meeting
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8. Galactic absorption toward GRB030227 is NH = 1.7 x 1021 cm-2
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9. An additional redshifted absorber is required
Photon index
1.94 +/- 0.05
NH =7x1022 cm-2
@ Z=3.9 +/- 0.3
EPIC Cons. Meeting
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10. Redshift Absorption 68%, 90%, 99% c.l. EPIC Cons. Meeting
S.Mereghetti - Oct. 14, 2003

11. Faint optical afterglow : R = 23.1 @ 12 hr
Castro-Tirado et al. 2003, A&A in press, astro-ph/
2.5 m I.Newton Tel. - R band - 1’ x 1’ field Feb 2003
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12. Excluded by lack of Lyman forest blanketing in optical afterglow
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13. EPIC Cons. Meeting
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14. Watson et al. ApJ in press
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15. 149/ /149
42/55
93.4/ /82
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16. Power law fit c2=73.6 dof=82 EPIC Cons. Meeting
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17. Possible line at E=1.67 keV (3.2s F-test)
Fe at
z = ?
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18. XTE
XMM
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19. 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
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20. EPIC Cons. Meeting
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21. 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.)
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22. Tiengo et al. 2003, A&A 409, 983 EPIC Cons. Meeting
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23. To + 5 hr
To + 30 hr
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24. EPIC Cons. Meeting
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25. To + 37 days To + 61 days EPIC Cons. Meeting
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26. c2 = 63/30
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27. EPIC Cons. Meeting
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28. weak hard to soft evolution of prompt emission
Conclusions on GRB
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 > > location in star forming region
possible line at keV (Fe ?)
lines from low Z metals ? still debated....
EPIC Cons. Meeting
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29. Conclusions on GRB
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
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30. Current capabilities of Integral Burst Alert System
(IBAS : Mereghetti et al. 2003, A&A, astro-ph/ )
GRB
4 arcmin after 30 s
fastest
and
most accurate
GRB localization
ever obtained !!
EPIC Cons. Meeting
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31. 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