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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. 33425).
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. 33429;
Levan et al., GCN Circ. 33439; Lipunov et al. GCN Circ. 33441;
O'Connor et al., GCN Circ. 33447; Im et al., GCN Circ. 33449;
Vanderspek et al., GCN Circ. 33453)
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
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