GRB 060331
GCN Circular 4942
Subject
H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
Date
2006-04-02T18:58:54Z (19 years ago)
From
Carlo Graziani at U.Chicago <carlo@oddjob.uchicago.edu>
R. Vanderspek, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb,
and S. Woosley, on behalf of the HETE Science Team;
M. Arimoto, T. Donaghy, E. Fenimore, M. Galassi, C. Graziani,
N. Ishikawa, A. Kobayashi, J. Kotoku, M. Maetou, M. Matsuoka,
Y. Nakagawa, T. Sakamoto, R. Sato, T. Shimokawabe, Y. Shirasaki,
S. Sugita, M. Suzuki, T. Tamagawa, K. Tanaka, and A. Yoshida, on behalf
of the HETE WXM Team;
N. Butler, G. Crew, J. Doty, G. Prigozhin, J. Villasenor,
J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R. Manchanda,
G. Pizzichini, and S. Gunasekera, on behalf of the HETE Operations and
HETE Optical-SXC Teams;
M. Boer, J-F Olive, A. Pelangeon, J-P Dezalay, and K. Hurley, on behalf
of the HETE FREGATE Team;
report:
At 13:11:23 UTC on April 2, 2006 HETE-2 detected another long, bright and
soft event coming from the same position as H4043(="GRB060331").
Ground analysis yields an error box with the following corners:
R.A. = 233.7856 deg. ; Dec. = -15.4384 deg.
= 15h35m09s ; = -15o26'18"
R.A. = 233.3906 deg. ; Dec. = -15.5543 deg.
= 15h33m34s ; = -15o33'15"
R.A. = 233.3972 deg. ; Dec. = -15.6477 deg.
= 15h33m36s ; = -15o38'51"
R.A. = 233.7922 deg. ; Dec. = -15.5313 deg.
= 15h35m10s ; = -15o31'52"
This position is consistent with the position of event H4043 (Fenimore et
al., GCN 4938). It is therefore unlikely that either H4043 or H4044 were
due to cosmic gamma ray bursts.
GCN Circular 4943
Subject
GRB060331: Swift/UVOT upper limits
Date
2006-04-03T10:10:57Z (19 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (UCL-MSSL), on behalf of the Swift/UVOT team
The Swift/UVOT observed the field of HETE II transient H4043 (Fenimore et al.
GCN 4938) at two separate epochs starting at 16:53 UT and 18:29 UT. A 575s
coadded exposure from the first epoch of observations taken in white reveals no
new source in the field of view down to a 5-sigma magnitude upper limit of
19.9. In both epochs no source is detected in summed images from any of the
filters used down to the following 5-sigma upper limits.
1st Epoch
Filter Date Obs. Exp (s) 5sigUL(mag)
B 17:08:07 UT 885 20.3
U 16:52:56 UT 885 20.0
White 17:23:18 UT 575 19.9
2nd Epoch
Filter Date Obs. Exp (s) 5sigUL(mag)
B 18:59:13 UT 605 19.8
U 18:44:02 UT 885 20.0
UVW1 18:28:55 UT 886 19.4
where Date Obs. is the time of the beginning of the observations. These
magnitudes are not corrected for Galactic extinction; E(B-V)=0.148.