[vsnet-grb-info 22666] IPN Triangulation of GRB 190606A (short)
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Jun 7 05:08:00 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 24765
SUBJECT: IPN Triangulation of GRB 190606A (short)
DATE: 19/06/06 20:06:29 GMT
FROM: Anna Kozlova at Ioffe Institute <ann_kozlova at mail.ioffe.ru>
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin,
and T. Cline on behalf of the Konus-Wind team,
K. Hurley, on behalf of the IPN,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,
and
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report:
The short-duration, very bright GRB 190606A
(AGILE-MCAL detection: Ursi et al., GCN Circ. 24759;
Fermi-LAT detection: Bissaldi et al., GCN Circ. 24761;
Fermi-GBM detection: Roberts et al,. GCN Circ. 24764)
has been detected by Fermi (GBM; trigger 581478912), Konus-Wind,
INTEGRAL (SPI-ACS), and AGILE (MCAL), so far, at about 6904 s UT (01:55:04).
We have triangulated it to a Konus-GBM annulus centered at
RA(2000)=88.386 deg (05h 53m 33s) Dec(2000)=+21.574 deg (+21d 34' 26"),
whose radius is 25.034 +/- 0.198 deg (3 sigma).
The LAT position reported by Bissaldi et al. (GCN Circ. 24761)
is consistent with the annulus. The annulus combined with
the LAT (90 % containment, statistical-only) error circle
gives the following error box:
--------------------------------------------------------------
RA(2000), deg Dec(2000), deg
------------------------------------------------------------
Center:
76.561 (05h 06m 15s) -0.638 ( -0d 38' 17")
Corners:
79.380 (05h 17m 31s) -1.649 ( -1d 38' 57")
79.227 (05h 16m 55s) -2.015 ( -2d 00' 55")
74.072 (04h 56m 17s) +1.026 ( +1d 01' 35")
73.869 (04h 55m 29s) +0.686 ( +0d 41' 09")
-------------------------------------------------------------
The error box area is 2.4 sq. deg (a factor of 10
smaller than that of the LAT error circle), and its maximum
dimension is 6 deg (the minimum one is 23.7 arcmin).
The Sun distance was ~22 deg.
This box may be improved.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB190606_T06903/IPN/
The time history and spectrum will be given in forthcoming
GCN Circulars.
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