GCN Circular 9173
Subject
GRB 090417B Correction to the BAT refined analysis position
Event
Date
2009-04-20T17:04:26Z (17 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy, H. A. Krimm (GSFC/USRA),
B. Sbarufatti(INAF-IASFPA), P.A. Evans (U. Leicester)
on behalf of the Swift team
We wish to make a correction to the reported analysis of the
extremely long-duration burst GRB 090417B (GCN circ #9135,
Sbarufatti et al.).
The position in the BAT refined-analysis circular (GCN circ #9139,
Cummings et al.) was based on the results of an automated script,
which was unable to find the optimum imaging interval due to the
unusual length of this burst. Thus the reported position was not
the best BAT ground-calculated position. The best position is
RA, Dec 209.687 +47.015, which is:
RA (J2000) 13h 58m 44.8s
Dec (J2000) 47d 00m 55s
with an error radius of ~1 arcmin. This position is 0.35 arcmin
from the XRT refined position (GCN circ #9155, Sbarufatti et al.).
We are grateful to those who noticed the discrepancy, and regret
any confusion resulting from this error. Any corrections to other
BAT refined-analysis items (which are expected to be slight), such
as to the spectral index, will appear in the final Swift Team
report on this burst.