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[vsnet-grb 93] (fwd) Giant flare from SGR1900+14

(fwd) Giant flare from SGR1900+14

   This message is from GCN No. 1041 and 1043:

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1041
SUBJECT: Giant flare from SGR1900+14
DATE:    01/04/18 13:17:22 GMT
FROM:    Filippo Frontera at ITESRE CNR  <filippo@tesre.bo.cnr.it>

C.Guidorzi, E.Montanari and F.Frontera, University of Ferrara, Italy;  E.
Costa, G.Gandolfi, M.Feroci and L.Piro, IAS-CNR, Roma;  L.Amati, TESRE,
CNR, Bologna; J.J.M. in 't Zand, SRON and Astronomical Institute, Utrecht,
NL; G. D'Andreta, R. Kaptein, L. Reboa, BeppoSAX Science Operation Center,
report:  
A giant flare of SGR1900+14 was detected by BeppoSAX at 7:55:12 UT of
April 18, 2001. The peak flux measured by the Gamma Ray Burst Monitor, 
after background subtraction and no dead time correction, is around 15400
c/s. The flare has an approximate duration of 40 s. The 5s pulsation is
apparent.  The Wide Field Camera #1 was switched off by rate protection at
a level of 1300 c/s before the flare peak.  A BeppoSAX TOO is in
progress. 

This message can be cited.

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1043
SUBJECT: IPN Triangulation of the Giant Flare from SGR1900+14
DATE:    01/04/18 21:33:55 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>

K. Hurley, on behalf of the Ulysses GRB team, and E. Montanari, C. Guidorzi,
F. Frontera, and M. Feroci, on behalf of the BeppoSAX GRBM team, report:

Ulysses observed the giant flare reported in GCN 1041.  As observed by
Ulysses, this flare had a duration ~40 s, a 25-100 keV fluence ~2.6 x
10^-4 erg/cm^2, and a peak flux over 0.5 s ~1.7x10^-5 erg/cm^2 s (or
about 25 and 200 times less fluence and peak flux than the giant flare
of 1998 August 27).  As Ulysses was in a solar proton flux, these
numbers are subject to more than the usual uncertainties.
Triangulation confirms that this flare is indeed from SGR1900+14 as
reported in GCN 1041.  The time history of this flare is quite unusual,
and will be posted at ssl.berkeley.edu/ipn3/ newdata.html/010418.

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