GRB 040825B
GCN Circular 2658
Subject
GRB040825B: Correction to GCN 2657
Date
2004-08-25T20:10:28Z (21 years ago)
From
Paul Price at IfA,UH <price@ifa.hawaii.edu>
Subsequent to GCN 2657, P.A. Price (IfA) adds:
Observations reported in GCN 2657 were of the localisation of GRB
040825B, i.e., HETE trigger 3510, centre 22:46:34 -2:24:27 J2000.
Thanks to Arne Henden for pointing out the possible confusion.
GCN Circular 2659
Subject
MASTER: GRB040825b optical observation
Date
2004-08-25T20:26:52Z (21 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov, A.Belinski,
M.Kuznetsov, S.Potanin, G.Antipov, E.Gorbovskoy,
N.Tyurina
Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow
At 4-th sec After HETE alert 3510 (WXM data refined since S/C_Last
Notic) MASTER robotic telescope (http://observ.pereplet.ru) had
automatically imaging the corresponding area of the sky (01h 43m after
trigger time). On the first image on 200 mm camera with 30 sec exposure
optical unfiltred limit is equal about 16.2.
On image (UT 18h06m33s) optical limit is about 17.0.
The comparison between these images with the USNO-A2 catalog does not
reveal any new source.
We have 30 unfiltered images of the error box (30s exposition, 40 x 50
arcmin) and 30 unfiltered images of the error box (60s exposition, 40 x 50
arcmin).
The optical limit on sum of 30 fits (1 minute exposure) is about 19.5.
FITS image are available at
http://observ.pereplet.ru/images/GRB040825/
This message may be cited.
GCN Circular 2662
Subject
GRB040825B (=H3510): An XRF Localized in Real Time by HETE
Date
2004-08-26T03:25:35Z (21 years ago)
From
Roland Vanderspek at MIT <roland@space.mit.edu>
GRB040825B (=H3510): An XRF Localized in Real Time by HETE
Y. Urata, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, on
behalf of the HETE Science Team;
T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka,
Y. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki,
T. Tamagawa, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on behalf of the
HETE WXM Team;
N. Butler, G. Crew, J. Doty, A. Dullighan, 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;
C. Barraud, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley, on behalf
of the HETE FREGATE Team;
report:
At 16:21:37 UTC (58897 s UT) on 25 August 2004, the HETE FREGATE and
WXM instruments detected event GRB040825B (=H3510), a long XRF.
The burst triggered the WXM in the 2-30 keV energy band; the burst
duration is roughly 80 seconds.
A flight localization was automatically forwarded to the GCN 31 seconds
after the trigger. The flight localization was a circle of 14' radius
centered at
RA = 22h 47m 22s, Dec = -02d 19' 05" (J2000)
Subsequent analysis of the full data set allowed the burst error region
to be reduced to a 160 sq. arcmin error box with the following coordinates,
distributed by GCN Notice 1.8 hours after the trigger:
RA = 22h 46m 38.9s, Dec = -02d 33m 40
RA = 22h 46m 01.9s, Dec = -02d 29m 17s
RA = 22h 46m 28.6s, Dec = -02d 15m 14s
RA = 22h 47m 05.5s, Dec = -02d 19m 41s
Preliminary spectral analyses show the burst spectrum is well fit by
a cutoff powerlaw model with an Epeak of 23 keV. The burst fluence
is 1.3e-6 erg/cm2 in the 2-30 keV band, 6.3e-7 erg/cm2 in the 30-400
keV band; GRB040825B is therefore an XRF.
Details of this burst can be found on the HETE web page at
http://space.mit.edu/HETE/Bursts/GRB040825B.
Further observations of this source are encouraged.
This message can be cited.
GCN Circular 2663
Subject
GRB040825B: optical observations
Date
2004-08-26T04:38:55Z (21 years ago)
From
Adalberto Piccioni at Astronomy, Bologna U. <piccioni@ermione.bo.astro.it>
This is a multi-part message in MIME format.
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A. Piccioni, C. Bartolini, A. Guarnieri, G. Greco (Bologna University),
P. Ferrero (IASF-CNR, Bologna; Osservatorio e Universita' di Teramo),
G. Pizzichini (IASF-CNR, Sezione di Bologna), F. Giovannelli (IASF-CNR,
Sezione di Roma) and R. Gualandi (Osservatorio di Bologna) report:
We observed the error box of GRB040825B (HETE trigger 3510, GCN 2662,
Urata et al.) with the 152 cm Loiano Telescope and the BFOSC camera
system on August 25, in non optimal sky conditions (seeing ~3.5 arcsec).
The field has been divided in two subfields centered at the coordinates:
22hh 46mm 40ss; -2deg 21arcmin 42arcsec and approximately 22hh 46mm
38ss;
-2deg 28arcmin, respectively.
We got 5X300s images with Rc filter of each subfield at mean UT 25.96076
and 25.99013, respectively.
The magnitude limit, estimated by aperture photometry, is approximately
19.5.
By comparison of the coadded images with the corresponding DSS-2 field
we do not find any obvious OT source in agreement with Price and
McNaugth, (GCN 2657), whose limit was deeper and at an earlier epoch.
The coadded images and the observation log will be posted into a public
directory from where it will be possible to retrieve by sftp using the
hostname: ermione.bo.astro.it, username: publicGRB, password: GRB_bo
and directory: GRB040825B.
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GCN Circular 2669
Subject
GRB040825B, BVRcIc field photometry
Date
2004-08-26T17:26:33Z (21 years ago)
From
Arne A. Henden at USNO/USRA <aah@nofs.navy.mil>
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:
We have acquired BVRcIc all-sky photometry for
a 11x11 arcmin field centered on the HETE coordinates
(Urata et al., GCN 2662; trigger 3510) for GRB040825B
with the USNOFS 1.0-m telescope on one photometric night.
Stars brighter than V=13.5 are saturated and
should be used with care. We have placed the photometric data
on our anonymous ftp site:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb040825b.dat
The astrometry in this file is based on linear plate solutions
with respect to UCAC2. The external errors are less than 100mas.
The estimated external photometric error is about 0.03mag
and will be improved with additional calibration nights
if an afterglow is discovered.
As always, you should check the dates on the .dat file prior to
final publication to get the latest photometry. There is
a README file on the ftp directory to give you information
about the procedures used to calibrate these fields.
GCN Circular 2675
Subject
GRB 040825B: Optical observations
Date
2004-08-27T19:23:10Z (21 years ago)
Edited On
2024-11-18T10:06:55Z (7 months ago)
From
Javier Gorosabel at LAEFF-INTA, Madrid <jgu@laeff.esa.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>
J. Gorosabel, A. de Ugarte Postigo,
L.F. Miranda, A.J. Castro-Tirado,
M. Jelinek (IAA-CSIC, Granada, Spain),
C.B. Pereira (ON, Rio de Janeiro, Brasil),
J.M. Castro Cerón (STScI, Baltimore, USA),
J. Aceituno (CAHA, Spain), report:
"We have observed the field of GRB 040825B
(GCN 2662) with the 2.2m(+CAFOS) Calar
Alto telescope on Aug 25.8443-25.8699 UT.
The observations were carried out in the
R-band (Texp = 4 x 300s) and cover the
entire GRB error box.
Visual comparison with the DSS-2 reveals
no variable source brighter than R~21."
This message can be cited.