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GCN Circular 33461

Subject
Further improved IPN localization for GRB 230307A
Date
2023-03-11T22:07:23Z (a year ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams,

J. Benkhoff on behalf of the BepiColombo team,

D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,

A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM team,

E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team,

and

W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:

Using the BepiColombo (MGNS) data we have further improved
the previous IPN box for GRB 230307A (Kozyrev et al., GCN Circ. 33425Not found
 
 
).
The coordinates of the updated 3 sigma error box are:
---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    60.867 (04h 03m 28s) -75.382 (-75d 22' 57")
  Corners:
    60.846 (04h 03m 23s) -75.417 (-75d 25' 03")
    61.006 (04h 04m 01s) -75.357 (-75d 21' 26")
    60.889 (04h 03m 33s) -75.348 (-75d 20' 51")
    60.728 (04h 02m 55s) -75.408 (-75d 24' 28")
  ---------------------------------------------
The error box area is 8 sq. arcmin, and its maximum
dimension is 5 arcmin (the minimum one is 1.8 arcmin).
The Sun distance was 80 deg.

This box may be further improved.

The distance between the IPN box center and X-ray/optical
transient position (X-ray Source #2 in Burrows et al., GCN Circ. 33429Not found
 
 
;
Levan et al., GCN Circ. 33439Not found
 
 
; Lipunov et al. GCN Circ. 33441Not found
 
 
;
O'Connor et al., GCN Circ. 33447Not found
 
 
; Im et al., GCN Circ. 33449Not found
 
 
;
Vanderspek et al., GCN Circ. 33453Not found
 
 
)
is 15 arcsec, which further strengthen the interpretation of transient as
the burst afterglow.

An updated triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230307_T56646/IPN