Issue |
A&A
Volume 401, Number 2, April II 2003
|
|
---|---|---|
Page(s) | 491 - 498 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20030143 | |
Published online | 21 March 2003 |
The dark burst 010214 with BeppoSAX: Possible variable absorption and jet X–ray emission
1
Dipartimento di Fisica, Università di Ferrara, via Paradiso 12, 44100 Ferrara, Italy
2
Istituto Astrofisica Spaziale e Fisica Cosmica, Sezione di Bologna, CNR, via Gobetti 101, 40129 Bologna, Italy
3
ITA “I. Calvi”, Finale Emilia (MO), Italy
4
Osservatorio Astronomico di Roma, via Frascati 33, Monteporzio 00040, Italy
5
Space Research Organization in the Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
6
Istituto Astrofisica Spaziale e Fisica Cosmica, Sezione di Roma, CNR, via Fosso del Cavaliere, 00133 Roma, Italy
7
Istituto Astrofisica Spaziale e Fisica Cosmica, Sezione di Palermo, CNR, via U. La Malfa 153, 90146 Palermo, Italy
Corresponding author: C. Guidorzi, guidorzi@fe.infn.it
Received:
10
October
2002
Accepted:
22
January
2003
We report on the prompt and afterglow emission observations of the dark
burst GRB010214 with BeppoSAX. The prompt emission shows possible evidence
of variable absorption from cm-2 in the first 6 s of the event to a value consistent
with the Galactic column density
(
cm-2) in the GRB
direction.
An X–ray afterglow emission in the 2–10 keV energy band was detected
with BeppoSAX, but an analogue search at lower wavelengths (optical, IR and
radio) was unsuccessful.
The X–ray afterglow spectrum is consistent with a power–law with
Galactic absorption. The light curve shows a complex decay, if
the tail of the prompt emission is assumed as the onset of the afterglow:
if the origin of the afterglow is coincident with the GRB onset,
a bump before ~
s is inferred, while if the afterglow
is assumed to start later, a steepening of the power–law light curve
at
s is deduced. We discuss these results in the light
of the current models of afterglows and the possible origin of the
GRB darkness. Finally, we tentatively derive an estimate of the
burst redshift.
Key words: gamma rays: bursts / gamma rays: observations
© ESO, 2003
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