- GCN/BACODINE POSITION NOTICE
TITLE: GCN/HETE BURST POSITION NOTICE
NOTICE_DATE: Sat 23 Aug 03 08:54:40 UT
NOTICE_TYPE: HETE S/C_Alert
TRIGGER_NUM: 2818, Seq_Num: 1
GRB_DATE: 12874 TJD; 235 DOY; 03/08/23
GRB_TIME: 31960.64 SOD {08:52:40.64} UT
TRIGGER_SOURCE: Trigger on the 6-120 keV band.
GAMMA_RATE: 399 [cnts/s] on a 5.200 [sec] timescale
SC_-Z_RA: 332 [deg]
SC_-Z_DEC: -10 [deg]
SC_LONG: 196 [deg East]
SUN_POSTN: 151.93d {+10h 07m 43s} +11.53d {+11d 31' 48"}
MOON_POSTN: 97.43d {+06h 29m 43s} +26.61d {+26d 36' 39"}
MOON_ILLUM: 20 [%]
COMMENTS: Probable GRB.
- GCN/BACODINE POSITION NOTICE
TITLE: GCN/HETE BURST POSITION NOTICE
NOTICE_DATE: Sat 23 Aug 03 11:10:20 UT
NOTICE_TYPE: HETE Ground Analysis
TRIGGER_NUM: 2818, Seq_Num: 3
GRB_DATE: 12874 TJD; 235 DOY; 03/08/23
GRB_TIME: 31960.64 SOD {08:52:40.64} UT
TRIGGER_SOURCE: Trigger on the 6-120 keV band.
GAMMA_RATE: 399 [cnts/s] on a 5.200 [sec] timescale
SC_-Z_RA: 331 [deg]
SC_-Z_DEC: -10 [deg]
SC_LONG: 196 [deg East]
WXM_CNTR_RA: 322.691d {+21h 30m 46s} (J2000),
322.733d {+21h 30m 56s} (current),
322.118d {+21h 28m 28s} (1950)
WXM_CNTR_DEC: +21.928d {+21d 55' 43"} (J2000),
+21.945d {+21d 56' 41"} (current),
+21.708d {+21d 42' 28"} (1950)
WXM_CORNER1: 322.7610 21.6320 [deg]
WXM_CORNER2: 322.5880 21.6230 [deg]
WXM_CORNER3: 322.6210 22.2250 [deg]
WXM_CORNER4: 322.7940 22.2340 [deg]
WXM_MAX_SIZE: 38.40 [arcmin] diameter
WXM_LOC_SN: 19 sig/noise (pt src in image)
WXM_IMAGE_SN: X= 7.2 Y= 4.1 [sig/noise]
WXM_LC_SN: X= 18.8 Y= 4.2 [sig/noise]
SUN_POSTN: 151.93d {+10h 07m 43s} +11.53d {+11d 31' 48"}
SUN_DIST: 145.33 [deg]
MOON_POSTN: 97.43d {+06h 29m 43s} +26.61d {+26d 36' 39"}
MOON_DIST: 114.58 [deg]
MOON_ILLUM: 20 [%]
GAL_COORDS: 73.19,-21.01 [deg] galactic lon,lat of the burst
ECL_COORDS: 333.53,34.49 [deg] ecliptic lon,lat of the burst
COMMENTS: Definite GRB.
COMMENTS: Burst_Validity flag is true.
COMMENTS: WXM data refined since S/C_Last Notice.
- GCN/BACODINE POSITION NOTICE
TITLE: GCN/HETE BURST POSITION NOTICE
NOTICE_DATE: Sat 23 Aug 03 12:06:16 UT
NOTICE_TYPE: HETE Ground Analysis
TRIGGER_NUM: 2818, Seq_Num: 4
GRB_DATE: 12874 TJD; 235 DOY; 03/08/23
GRB_TIME: 31960.64 SOD {08:52:40.64} UT
TRIGGER_SOURCE: Trigger on the 6-120 keV band.
GAMMA_RATE: 399 [cnts/s] on a 5.200 [sec] timescale
SC_-Z_RA: 330 [deg]
SC_-Z_DEC: -10 [deg]
SC_LONG: 196 [deg East]
SXC_CNTR_RA: 322.695d {+21h 30m 47s} (J2000),
322.736d {+21h 30m 57s} (current),
322.122d {+21h 28m 29s} (1950)
SXC_CNTR_DEC: +21.996d {+21d 59' 46"} (J2000),
+22.012d {+22d 00' 45"} (current),
+21.776d {+21d 46' 32"} (1950)
SXC_CORNER1: 322.6120 22.0290 [deg]
SXC_CORNER2: 322.6080 21.9540 [deg]
SXC_CORNER3: 322.7810 22.0380 [deg]
SXC_CORNER4: 322.7770 21.9640 [deg]
SXC_MAX_SIZE: 10.85 [arcmin] diameter
SXC_LOC_SN: 2 sig/noise (pt src in image)
SUN_POSTN: 151.93d {+10h 07m 43s} +11.53d {+11d 31' 48"}
SUN_DIST: 145.27 [deg]
MOON_POSTN: 97.43d {+06h 29m 43s} +26.61d {+26d 36' 39"}
MOON_DIST: 114.52 [deg]
MOON_ILLUM: 20 [%]
GAL_COORDS: 73.25,-20.97 [deg] galactic lon,lat of the burst
ECL_COORDS: 333.57,34.55 [deg] ecliptic lon,lat of the burst
COMMENTS: Definite GRB.
COMMENTS: Burst_Validity flag is true.
COMMENTS: WXM data refined since S/C_Last Notice.
COMMENTS: SXC data refined since S/C_Last Notice.
- GCN notice #2360
K.Y Huang, Y. Urata, S. Takahashi, W.P. Chen , J.W. Chen,
Y.S. Li, H.C. Lin, S.K. King and W.H. Ip report;
"We have observed the entire error region of HETE-2 SXC of
GRB030823(= H2818) with the Lulin observatory 1.0 m telescope
starting at Aug. 23 12.406 UT. Muti-band images were taken by
PI1300 camera (10'x 10' field of view).
The limiting magnitude of R-band images taken with 60 sec
exposure is 18.8 mag(SN=3, with USNO-A2.0 red magnitudes).
Comparison with the DSS2 images, no new object was detected down
to the limiting magnitude.The observation are in progress."
- GCN notice #2361
J. Wren and W.T. Vestrand report on behalf of the RAPTOR team;
Both telescope arrays of our RAPTOR stereoscopic sky monitoring system
responded to the first HETE-2 ground notice for GRB030823 (2818). The
first image was taken at 11:10:24.74 UT -- 4 seconds after receipt of
the GCN notice and 2.3 hours after the burst itself. The initial
images from RAPTOR-A reached an unfiltered limiting magnitude of 16.0.
Comparison against our own archival frames and the USNO-A2.0 catalog
within 10 arcminutes of the coordinates given in the second HETE
ground notice (HETE 2818 seq. 4) yielded no candidate objects.
- GCN notice #2362
M. Suzuki, Y. Yatsu, Y. Kuramoto, and N. Kawai report:
"We have observed the field covering the entire SXC error box of
GRB030823 (HETE trigger 2818; trigger time 08:52:40 UT) with the
unfiltered CCD camera on the 30-cm telescope at Tokyo Tech, beginning
at 10:43:19 UT. We started the observation earlier than the GCN notice,
since M.S., as a member of the HETE ops team, had access to the
preliminary WXM ground location before its validity was evaluated.
Visual inspection of the images revealed no obvious new source compared
with the DSS 2 (red) to an approximate limiting magnitude of 16.5."
- GCN notice #2365
D.B. Fox and M.P. Hunt (Caltech) report on behalf of the Caltech-NRAO
GRB Collaboration:
"We have observed the HETE-2 SXC localization region for GRB030823
with the 200-inch Hale Telescope and Large-Format Camera on
Mt. Palomar on August 24.15 and August 25.23 UT. Our dithered 4x300s
images cover the full localization region on each night at mean epochs
of 0.78 and 1.86 days after the burst, respectively. PSF-matched
image subtraction reveals no bright, variable sources within the SXC
error box. We therefore derive a limit of R>22.5 on the brightness of
any variable optical counterpart at the epoch of our first
observation."
- GCN notice #2366
M.A. Ibrahimov, I.M. Asfandiyarov, B.B. Kahharov (UBAI), A.Pozanenko (IKI),
V.Rumyantsev, E.Pavlenko, O. Antoniuk (CrAO), G.Beskin (SAO) report:
We have observed the entire SXC error box of GRB030823 (HETE trigger 2818)
with different instruments. The observations started at 15:46 UT (6.9h after
burst) with 1.5m telescope of Maidanak High-altitude Observatory (UBAI).
Two sets of images (##1,2 in a table below) covering entire SXC error box
at different epochs were taken with 1.5m telescope. Visual comparison of
images at two different epochs reveals no bright variable source.
Observations at Crimean Astrophysical Observatory were carried out with
AT-64 and K-380 telescopes. Visual comparison of all images with DSS2
reveals no new sources down to limiting magnitude indicated in the table.
# Mid. Time Telescope Exposure Limiting
(UT) magnitude
(R)
1 23.6651 1.5m (UBAI) 300s 19.5
2 23.7805 1.5m (UBAI) 300s 20.5
3 23.7826 AT-64 (CrAO) 7x180s 20.5
4 23.8131 K-380 (CrAO) 6x300s 19.0
- GCN notice #2370
GRB 030823 observation at Ouda
A. Imada, T. Kato (Kyoto U) and H. Yamaoka (Kyushu U) report:
"We observed the entire SXC error circle of GRB (XRF) 030823
with Ouda 0.60-m telescope starting at Aug. 24.61 UT, i.e., 1.24 days
after the burst. The limiting magnitude of a stacked Rc-band image
(60 x 60 seconds exposure) is 20.5 mag, compared with USNO-A2.0 rmag.
Visual comparison with the DSS 2 red image yields no new source."
This message may be cited.
- GCN notice #2401
Y. Shirasaki, G. Crew, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and
S. Woosley on behalf of the HETE Science Team;
T. Donaghy, C. Graziani, T. Tamagawa, M. Suzuki, M. Matsuoka, K. Torii,
T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, Y. Nakagawa, R. Satoh,
Y. Urata, T. Yamazaki and Y. Yamamoto, on behalf of the HETE WXM Team;
A. Dullighan, N. Butler, J. Doty, G. Prigozhin, R. Vanderspek, J.
Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R.
Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE
Optical-SXC Teams;
M. Boer, J-F Olive, J-P Dezalay, C. Barraud and K. Hurley on behalf of
the HETE FREGATE Team;
report:
At 08:52:40.64 UTC (31960.64 s UT) on 23 August 2003, the HETE FREGATE,
WXM, and SXC instruments detected event H2818, an X-Ray Flash.
The burst triggered FREGATE in the 6-80 keV energy band. The burst
occurred at the extreme edge of the FOV of the WXM Y-detector, and
therefore no flight localization was possible. Ground analysis of the
WXM data provided a localization that was reported in a GCN Notice at
11:10:20 UT. The WXM ground localization SNR was 19. The localization
can be expressed as a 90% confidence rectangle, whose center is at:
WXM-Ground: R.A. = 21h 30m 46s, Dec. = +21d 55' 43" (J2000),
and whose corners lie at:
R.A. = 21h 31m 02.6s, Dec. = 21d 37' 55"
R.A. = 21h 30m 21.1s, Dec. = 21d 37' 23"
R.A. = 21h 30m 29.0s, Dec. = 22d 13' 30"
R.A. = 21h 31m 10.6s, Dec. = 22d 14' 02" (J2000).
The SXC Y-camera detected the burst, but the X-camera did not. The SXC
Y-camera localization further constrains the WXM location to an error
box that was reported in a GCN Notice at 12:06:16 UT. This joint
WXM/SXC localization can be expressed as a 90% confidence rectangle,
whose center is at:
SXC/WXM-Ground: R.A. = 21h 30m 47s, Dec. = +21d 59' 46" (J2000),
and whose corners lie at:
R.A. = 21h 30m 26.9s, Dec. = 22d 01' 44"
R.A. = 21h 30m 25.9s, Dec. = 21d 57' 14"
R.A. = 21h 31m 07.4s, Dec. = 22d 02' 17"
R.A. = 21h 31m 06.5s, Dec. = 21d 57' 50" (J2000).
The T90 duration of the burst was 56 seconds in the WXM 2-25 keV energy
band. The peak flux of the burst in 1 second is 4.5 x 10-8 erg cm-2
s-1 in the 7-30 keV energy band and 5.5 x 10-8 erg cm-2 s-1 in the
30-400 keV energy band. The fluence of the burst is 2.3 x 10-6 erg
cm-2 and 1.5 x 10-6 erg cm-2 in the same energy bands, respectively.
Thus S(2-30 keV)/S(30-400 keV) = 1.5, making this burst an X-ray flash.
A light curve and skymap for XRF030823 is provided at the following
URL:
http://space.mit.edu/HETE/Bursts/GRB030823
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