[vsnet-grb-info 6531] SGR 0501+4516: Fermi GBM (formerly GLAST Burst
Monitor) observations of three exceptionally intense outbursts
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Aug 27 07:11:14 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8139
SUBJECT: SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
DATE: 08/08/26 22:10:21 GMT
FROM: Jerry Fishman at NASA-MSFC <jerry.fishman at nasa.gov>
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G. J. Fishman (MSFC), S. McBreen (MPE), M. S. Briggs (UAH), C.
Kouveliotou (MSFC), A. von Kienlin (MPE), A. J. van der Horst
(MSFC/ORAU), P. N. Bhat (UAH), C. A. Meegan (MSFC), report for the Fermi
GBM team:=20
=20
A recent GCN Circ. (Kouveliotou, et al., GCN 8138) summarizes
observations of SGR 0501+4516,as seen with the Fermi GBM (formerly GLAST
Burst Monitor). Below, we report on three exceptionally large events
from this data set observed on 24 and 25 August 2008. Peak fluxes are
over a time interval of 64 ms and fluences for the durations listed;
both are for the energy range 20 to 200 keV. All event spectra were best
fit with a power law and an exponential cutoff; their spectral
parameters are also given below.=20
These large events may have observable ionospheric disturbances
associated with them.
=20
----------------------------------------------------------------------
Date UT Fluence Peak flux Index E(peak) Duration
(erg/cm2) (erg/cm2-s) (keV) (ms)
080824* 1:17:57 2.2E-5 1.6E-4 0.21 50 448
080825* 4:48:29 2.7E-6 3.6E-5 0.14 39 192
080825 9:37:44 9.9E-7 1.0E-5 0.32 38 320
* - reported by S. Golenetskii from Konus-Wind data (GCN 8132)
-----------------------------------------------------------------------
=20
=20
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<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>G. J.
Fishman (MSFC), S. McBreen (MPE), M. S. Briggs (UAH), C. Kouveliotou =
(MSFC), A.
von Kienlin (MPE), A. J. van der Horst (MSFC/ORAU), P. N. Bhat (UAH), C. =
A.
Meegan (MSFC), report for the Fermi GBM team: =
<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'><o:p> </o:p=
></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>A
recent GCN Circ. (Kouveliotou, et al., GCN 8138) summarizes observations =
of SGR
0501+4516,as seen with the Fermi GBM (formerly GLAST Burst Monitor). =
Below, we
report on three exceptionally large events from this data set observed =
on 24
and 25 August 2008. Peak fluxes are over a time interval of 64 ms =
and fluences
for the durations listed; both are for the energy range 20 to 200 keV. =
All
event spectra were best fit with a power law and an exponential cutoff; =
their
spectral parameters are also given below. <o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>These
large events may have observable ionospheric disturbances associated =
with them.<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'><o:p> </o:p=
></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>----------------=
------------------------------------------------------<o:p></o:p></span><=
/font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'> Date =
UT Fluence Peak =
flux Index E(peak) =
Duration<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:12.0pt;font-family:Arial;color:black'> &nbs=
p;  =
;
</span></font><font color=3Dblack face=3DArial><span lang=3DDE =
style=3D'font-family:
Arial;color:black'>(erg/cm2) =
(erg/cm2-s) =
(keV) (ms)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span lang=3DDE =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>080824*
1:17:57 2.2E-5 =
1.6E-4 0.21 =
50 448<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span lang=3DDE =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>080825*
4:48:29 2.7E-6 =
3.6E-5 0.14 =
39 192<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span lang=3DDE =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>080825 &nbs=
p;
9:37:44 9.9E-7 =
1.0E-5 0.32 =
38 320<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span lang=3DDE =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>
* - reported by S. Golenetskii from Konus-Wind data (GCN =
8132)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-autospace:none'><font size=3D3 =
color=3Dblack
face=3DArial><span lang=3DDE =
style=3D'font-size:12.0pt;font-family:Arial;color:black'>----------------=
-------------------------------------------------------<o:p></o:p></span>=
</font></p>
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