GRB 040403, GRB 040403A
GCN Circular 2571
Subject
GRB 040403, deep optical observations
Date
2004-04-22T07:37:37Z (22 years ago)
Edited On
2024-11-18T09:44:45Z (a year ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
GRB 040403, deep optical observations
----------------------------------------------
A. de Ugarte, A. Sota, J. Gorosabel and A. J. Castro-Tirado
(Instituto de Astrofísica de Andalucía, IAA-CSIC, Granada),
and J. M. Castro Cerón (STScI, Baltimore)
communicate:
"We observed the field of the X-ray rich GRB 040403 detected
by INTEGRAL (GCN Circ. 2560, Gotz et al.) starting on 3 Apr
2004 (20:00 UT) with the 1.5 m telescope at the Observatorio
de Sierra Nevada in Granada. Imagery was obtained in the R-
band (6 x 600 s). Comparison images were adquired on 4 and 20
Apr 2004 (9 x 600 s). No optical variable source is detected
within the 3' radius error box provided by IBIS/IGRIS down
to a limiting magnitude of 22.2 (3 sigma) 15 hr after the
event. This might be indicative of a dark GRB."
This message may be cited.
GCN Circular 2566
Subject
HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
Date
2004-04-09T21:16:39Z (22 years ago)
From
Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu>
K. Hurley, on behalf of the HETE GRB Team,
E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team,
G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R.
Vanderspek, J. Villasenor, G. Crew, A. Dullighan, N. Butler, J.G.
Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, J. Braga, R.
Manchanda, G. Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T.
Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi,
T. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on
behalf of the HETE GRB team, and
T. Cline, on behalf of the HETE and Konus-Wind GRB teams, report:
HETE detected two GRBs on 2004 April 03; the presence of Sco X-1 in the
WXM field-of-view made analyses and reporting of their results somewhat
complicated. Both events were also detected by Konus-Wind, but by no
other instruments in the IPN.
GRB040403A was detected as trigger #H3143 at 16:55:03 UT (60903 SOD).
It was detected primarily in the Fregate 30-400 keV band. The absence
of a signal in the 7-40 and 7-80 keV bands indicates that the burst was
detected at the edge of the Fregate FOV; there was no discernable
signal in the WXM. The WXM flight software looked for a real-time
localization for GRB040403A, but was able only to localize Sco X-1:
this position was distributed to the GCN 27 seconds after burst
detection. After detailed analysis of the WXM data, the localization
was retracted two hours after the initial report. Due to a software
error, the retraction Notice indicated that the trigger was not a real
GRB; H3143 is indeed a real GRB, but the position distributed in real
time was not that of the burst.
A combination of triangulation, the Konus ecliptic latitude
response, and HETE Earth-blocking give a large 5-sided error box whose
shape is complex, and whose corners are at:
RA(2000) Decl(2000)
263 +20.5
282 +33.1
302 +37.4
308 +37.8
304 +25.7
A map has been posted at ssl.berkeley.edu/ipn3/040403A.
As observed by Konus-Wind, this burst had a duration of 98s, a 20-2000
keV fluence of 6E-5 erg/cm2 (or 4E-5 in 30-400 keV range), a 20-2000
keV peak flux ~ 2.6E-6 erg/cm2 s, and an Epeak=340+/-20 keV.
GRB040403B was detected as trigger #H3144 at 23:23:55 UT (84236 SOD).
As observed by FREGATE, it consists of two short (0.5s) spikes
separated by ~0.8s. The burst is seen most strongly in the 30-400 keV
band with an Epeak well above this range. GRB040403B therefore
qualifies as a short/hard burst. The burst was marginally detected by
the WXM; unfortunately, the presence of Sco X-1 in the WXM FOV makes
localization of this burst impossible. The SXC was not operating at
this time because of the full moon.
Triangulation gives an annulus of location centered at
RA, Decl=127.559, +21.669, whose radius is 70.529 +/- 2.155
degrees (3 sigma). The WXM field of view limits this annulus
to an error box with the following corners:
RA(2000) Decl(2000)
188.213 -1.116
191.330 -15.436
199.758 +36.566
212.802 +40.309
A map may be viewed at ssl.berkeley.edu/ipn3/040403B.
As observed by Konus-Wind, this burst had a 20-2000 keV fluence
~ 2E-6 erg/cm2, a peak flux ~ 4.5E-6 erg/cm2 s, and an
Epeak=1300+/-1000 keV.
This message can be cited.
GCN Circular 2565
Subject
GRB 040403: Optical Observations
Date
2004-04-06T17:37:20Z (22 years ago)
From
Vasilij Rumjantsev at CrAO <rum@crao.crimea.ua>
V.Rumyantsev (CrAO) and A.Pozanenko (IKI) report:
We have obtained 10 unfiltered images (300 s exposure each) of the GRB040403
error box (D.Gotz et al., GCN 2560). The images were taken with the AT-64
telescope of Crimean Astrophysical observatory and cover the period UT
17:48:54 - 18:37:24 of April 3, 2004.
No afterglow candidate was found in comparison with DSS2. We estimated the
limiting magnitudes of combined image (S/N=3) as following
Start time (UT) telescope exposure limiting mag.
Apr. 03 17:48 AT-64 10x300 s 20.0
Combined image can be found at http://grb.rssi.ru/GRB040403/
This message can be cited.
GCN Circular 2564
Subject
GRB 040403 Optical Observations
Date
2004-04-05T07:04:21Z (22 years ago)
From
Kuntal Mishra at State Obs,Nainital,India <kuntal@upso.ernet.in>
Kuntal Mishra on behalf of the GRB team reports:
We observed the error circle of INTEGRAL GRB 040403 (Gotz et al., GCN
2560) in R band,
with 1.0-m telescope at Nainital (India) on April 03, 2004 starting at
16:44 UT. We found no
new source brighter than R = 19.5 when comparing with DSS-2 R-band chart
(USNOA2.0 reference).
Ms.KUNTAL MISHRA (JRF) email: kuntal@upso.ernet.in
STATE OBSERVATORY, : kuntal_mishra@yahoo.com
MANORA PEAK, NAINITAL Phone: (91-05942) 235136, 235583
UTTARANCHAL 263 129 Fax : (91-05942) 235126, 235053
INDIA. Gram : Astronomy
GCN Circular 2563
Subject
GRB 040403: Optical observations
Date
2004-04-04T22:59:39Z (22 years ago)
From
Arto Oksanen at Nyrola Obs., Finland <oksanen@nyrola.jklsirius.fi>
P. Tikkanen and A. Oksanen on behalf of Nyrola observatory GRB Team
and AAVSO International High Energy Network report:
A 24 x 16 arcmin field covering the INTEGRAL error circle of GRB
040403 (GCN 2560) was imaged with the 0.4m SCT of the Nyrola
Observatory starting at April 3, 2004 20:05 UT, 15.0 hours
after the burst. Observation was taken under quite poor conditions,
bright moonlight, northern lights and moderate seeing.
Total of 53 four minute Rc-exposures, exposure time of 12720 seconds,
were sigma reject combined and compared against the Digitized Sky
Survey (DSS2R).
No new objects brighter than DSS2 plate limit was detected, but some
fainter objects were also present inside error circle. The faintest
stars on the combined image are about Rc=20.4 (USNOA2.0 reference).
The combined image is available on web:
http://nyrola.jklsirius.fi/grb/grb040403
Nyrola observatory wants to express gratitude to AAVSO for loaning
the CCD camera and to Wihuri foundation for generous grants for the
observatory.
The AAVSO International High Energy network is grateful for a
generous grant from the Curry Foundation and to NASA for the
financial support for the High Energy Workshops for Amateur
Astronomers.
GCN Circular 2562
Subject
GRB 040403: optical observations
Date
2004-04-04T02:58:43Z (22 years ago)
From
Rodion Burenin at IKI, Moscow <rodion@hea.iki.rssi.ru>
I. Khamitov, Z. Aslan, M. Parmaksizoglu (TUG),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
I. Bikmaev, N. Sakhibullin (KSU)
report:
We observed the entire error circle of INTEGRAL GRB 040403 (Gotz et al., GCN
2560) in R band, with 1.5-m Russian-Turkish Telescope RTT150 at Bakyrlytepe,
Turkey. The observations were started at 17:22 UT and lasted for few hours
under bad seeng conditions (2--3'') and bright moon. We detected no source
brighter than R=21.0, which is variable for more than 0.2 mag.
This message may be cited.
GCN Circular 2561
Subject
GRB 040403: Optical Observations
Date
2004-04-03T12:53:51Z (22 years ago)
From
Jane Moran at U.North Carolina <moranj@physics.unc.edu>
J. Moran, M. Nysewander, and D. Reichart report on behalf of the FUN GRB
Collaboration:
We imaged the entire ~30 square arcminute error circle of the INTEGRAL GRB
040403 (Gotz et al., GCN 2560) with the 0.6-meter Morehead Observatory
telescope beginning 70 minutes after the burst. We integrated in Rc for
4440 seconds under non-ideal conditions.
Visual comparison to the DSS/POSS2-Red reveals no obvious new source to our
limiting magnitude (Rc ~ 19 mag).
GCN Circular 2560
Subject
GRB 040403: a long GRB detected with INTEGRAL
Date
2004-04-03T06:15:24Z (22 years ago)
From
Diego Gotz at IASF-CNR <diego@mi.iasf.cnr.it>
D. Gotz, S. Mereghetti (IASF, Milano), J. Borkowski, M. Beck (ISDC) on
behalf of the IBAS Localization Team, S. Shaw on behalf of the INTEGRAL
Science data Centre (ISDC) and the INTEGRAL Science Working Team report:
A 35 s long GRB has been detected with the INTEGRAL Burst Alert System
(IBAS) on April 3 at 05:08:08 UT. The GRB has been detected with
IBIS/ISGRI in the 15-200 keV band. Its coordinates (J2000) are:
R.A. 07h 40m 55s
Dec. 68deg 12' 39''
with an uncertainty of 3 arcmin.
The preliminary peak flux in the 20-200 keV range is about 0.4
photons/cmsq/s (3 x 10^-8 erg/cmsq/s) (1 s integration time). From the
preliminary spectral analysis this GRB seems to be X-ray rich.
Further analysis is underway.
This message can be cited.