[vsnet-grb-info 2477] IPN observations of SGR1806-20

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4314
SUBJECT: IPN observations of SGR1806-20
DATE:    05/12/09 22:02:55 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley at ssl.berkeley.edu>

K. Hurley and T. Cline, on behalf of the Ulysses, Mars Odyssey,
and Konus GRB teams,

I. Mitrofanov, A. Kozyrev, M. Litvak, A. Sanin, V. Tret'yakov and A.
Parshukov, on behalf of the HEND-Odyssey GRB team,

W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on
behalf of the GRS-Odyssey GRB team,

S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, and D. Frederiks,
on behalf of the Konus-Wind team,

S. Barthelmy, J. Cummings, N. Gehrels, and H. Krimm,
on behalf of the Swift team,

A. von Kienlin, G. Lichti, A. Rau, D. Gotz, and S. Mereghetti,
on behalf of the INTEGRAL GRB team,

and D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W.
Hajdas, A. Zehnder, S. Boggs, and M. Bandstra, on behalf of the RHESSI 
GRB team, report:

Various IPN spacecraft have observed the possible activity of
SGR1806-20 (Golenetski et al. GCN Circ. 4310, 4312).  The following
table summarizes the results. 


DATE	TIME	REFERENCE  ANNULUS CENTER   ANNULUS RADIUS    DISTANCE FROM  SPACECRAFT  SGR1801?
		GCN #	    RA	   DEC			      SGR1806-20

051201	35965	4310	 216.911 -15.332    52.530+/-0.345     0.069		K,O,R	    No
051203	32626	4310	 216.686 -15.337    52.647+/-0.275     0.161		K,O	    No
051203	42204	4312	 273.814 -20.444     7.139+/-7.139     5.692		K,R,S,I	    Yes



NOTES: The annulus center RA and Dec are J2000.  The uncertainty in the
radius is 3 sigma.  The distance from SGR1806-20 is the distance
between the center line of the annulus and the source, in degrees.  The
spacecraft are Konus (K), Odyssey (O), RHESSI (R), Swift (S), and
INTEGRAL (I); Ulysses was off.  SGR1801? indicates whether the IPN
annulus is consistent with the position of SGR1801-23 (Cline et al.,
Ap.J. 531, 407, 2000).  For the first event on 051203, SGR1806 and
SGR1801 were Earth-occulted for RHESSI.  The triangulation annulus
(actually a circle) for the second event on 051203 is also consistent
with the position of the bursting pulsar, GROJ1744-28.

These localizations support the conclusion that the source of the
first two events, and therefore probably the third also, is indeed 
SGR1806-20.