Gamma-ray Burst 040825B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE   
NOTICE_DATE:    Wed 25 Aug 04 16:25:31 UT
NOTICE_TYPE:    HETE S/C_Alert 
TRIGGER_NUM:    3510,   Seq_Num: 1
GRB_DATE:       13242 TJD;   238 DOY;   04/08/25
GRB_TIME:       58897.79 SOD {16:21:37.79} UT
TRIGGER_SOURCE: Trigger on the 2-30 keV band.
WXM_SIG/NOISE:  0.1 sig/noise  on a 18.800 [sec] timescale
SC_-Z_RA:       336 [deg]
SC_-Z_DEC:       -9 [deg]
SC_LONG:        126 [deg East] 
WXM_CNTR_RA:    341.841d {+22h 47m 22s} (J2000),
                341.901d {+22h 47m 36s} (current),
                341.197d {+22h 44m 47s} (1950) 
WXM_CNTR_DEC:    -2.318d {-02d 19' 05"} (J2000),
                 -2.294d {-02d 17' 36"} (current),
                 -2.582d {-02d 34' 55"} (1950)
WXM_MAX_SIZE:   28.00 [arcmin] diameter
WXM_LOC_SN:     5 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 4.2 Y= 3.0 [sig/noise]
WXM_LC_SN:      X= 8.0 Y= 3.7 [sig/noise]
SUN_POSTN:      154.75d {+10h 18m 60s}  +10.48d {+10d 28' 40"}
SUN_DIST:       169.16 [deg]   
MOON_POSTN:     273.19d {+18h 12m 45s}  -27.82d {-27d 49' 09"}
MOON_DIST:       70.15 [deg]   
MOON_ILLUM:     75 [%]
GAL_COORDS:     67.48,-51.31 [deg] galactic lon,lat of the burst
ECL_COORDS:     342.37,4.98 [deg] ecliptic lon,lat of the burst
COMMENTS:       Possible GRB.
COMMENTS:       Possible XRB.  
COMMENTS:       WXM error box is circular; not rectangular.

GCN/BACODINE POSITION NOTICE

 
TITLE:          GCN/HETE BURST POSITION NOTICE   
NOTICE_DATE:    Wed 25 Aug 04 16:25:34 UT
NOTICE_TYPE:    HETE S/C_Update
TRIGGER_NUM:    3510,   Seq_Num: 2
GRB_DATE:       13242 TJD;   238 DOY;   04/08/25
GRB_TIME:       58897.79 SOD {16:21:37.79} UT
TRIGGER_SOURCE: Trigger on the 2-30 keV band.
WXM_SIG/NOISE:  0.1 sig/noise  on a 18.800 [sec] timescale
SC_-Z_RA:       336 [deg]
SC_-Z_DEC:       -9 [deg]
SC_LONG:        126 [deg East] 
WXM_CNTR_RA:    341.841d {+22h 47m 22s} (J2000),
                341.901d {+22h 47m 36s} (current),
                341.197d {+22h 44m 47s} (1950) 
WXM_CNTR_DEC:    -2.318d {-02d 19' 05"} (J2000),
                 -2.294d {-02d 17' 36"} (current),
                 -2.582d {-02d 34' 55"} (1950)
WXM_MAX_SIZE:   28.00 [arcmin] diameter
WXM_LOC_SN:     5 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 4.2 Y= 3.0 [sig/noise]
WXM_LC_SN:      X= 8.0 Y= 3.7 [sig/noise]
SUN_POSTN:      154.75d {+10h 18m 60s}  +10.48d {+10d 28' 40"}
SUN_DIST:       169.16 [deg]   
MOON_POSTN:     273.19d {+18h 12m 45s}  -27.82d {-27d 49' 09"}
MOON_DIST:       70.15 [deg]   
MOON_ILLUM:     75 [%]
GAL_COORDS:     67.48,-51.31 [deg] galactic lon,lat of the burst
ECL_COORDS:     342.37,4.98 [deg] ecliptic lon,lat of the burst
COMMENTS:       Possible GRB.
COMMENTS:       Possible XRB.  
COMMENTS:       WXM error box is circular; not rectangular.

GCN/BACODINE POSITION NOTICE

 
TITLE:          GCN/HETE BURST POSITION NOTICE   
NOTICE_DATE:    Wed 25 Aug 04 16:25:40 UT
NOTICE_TYPE:    HETE S/C_Update
TRIGGER_NUM:    3510,   Seq_Num: 3
GRB_DATE:       13242 TJD;   238 DOY;   04/08/25
GRB_TIME:       58897.79 SOD {16:21:37.79} UT
TRIGGER_SOURCE: Trigger on the 2-30 keV band.
WXM_SIG/NOISE:  0.1 sig/noise  on a 18.800 [sec] timescale
SC_-Z_RA:       336 [deg]
SC_-Z_DEC:       -9 [deg]
SC_LONG:        126 [deg East] 
WXM_CNTR_RA:    341.707d {+22h 46m 50s} (J2000),
                341.766d {+22h 47m 04s} (current),
                341.062d {+22h 44m 15s} (1950) 
WXM_CNTR_DEC:    -2.254d {-02d 15' 13"} (J2000),
                 -2.229d {-02d 13' 45"} (current),
                 -2.518d {-02d 31' 03"} (1950)
WXM_MAX_SIZE:   28.00 [arcmin] diameter
WXM_LOC_SN:     5 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 4.0 Y= 3.0 [sig/noise]
WXM_LC_SN:      X= 8.7 Y= 5.0 [sig/noise]
SUN_POSTN:      154.75d {+10h 18m 60s}  +10.48d {+10d 28' 40"}
SUN_DIST:       169.20 [deg]   
MOON_POSTN:     273.19d {+18h 12m 45s}  -27.82d {-27d 49' 09"}
MOON_DIST:       70.07 [deg]   
MOON_ILLUM:     75 [%]
GAL_COORDS:     67.41,-51.17 [deg] galactic lon,lat of the burst
ECL_COORDS:     342.27,5.09 [deg] ecliptic lon,lat of the burst
COMMENTS:       Possible GRB.
COMMENTS:       Possible XRB.  
COMMENTS:       WXM error box is circular; not rectangular.

GCN/BACODINE POSITION NOTICE

 
TITLE:          GCN/HETE BURST POSITION NOTICE   
NOTICE_DATE:    Wed 25 Aug 04 16:28:47 UT
NOTICE_TYPE:    HETE S/C_Last  
TRIGGER_NUM:    3510,   Seq_Num: 4
GRB_DATE:       13242 TJD;   238 DOY;   04/08/25
GRB_TIME:       58897.79 SOD {16:21:37.79} UT
TRIGGER_SOURCE: Trigger on the 2-30 keV band.
WXM_SIG/NOISE:  0.1 sig/noise  on a 18.800 [sec] timescale
SC_-Z_RA:       336 [deg]
SC_-Z_DEC:       -9 [deg]
SC_LONG:        126 [deg East] 
WXM_CNTR_RA:    341.707d {+22h 46m 50s} (J2000),
                341.766d {+22h 47m 04s} (current),
                341.062d {+22h 44m 15s} (1950) 
WXM_CNTR_DEC:    -2.254d {-02d 15' 13"} (J2000),
                 -2.229d {-02d 13' 45"} (current),
                 -2.518d {-02d 31' 03"} (1950)
WXM_MAX_SIZE:   28.00 [arcmin] diameter
WXM_LOC_SN:     5 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 4.0 Y= 3.0 [sig/noise]
WXM_LC_SN:      X= 8.7 Y= 5.0 [sig/noise]
SUN_POSTN:      154.75d {+10h 18m 60s}  +10.48d {+10d 28' 40"}
SUN_DIST:       169.20 [deg]   
MOON_POSTN:     273.19d {+18h 12m 45s}  -27.82d {-27d 49' 09"}
MOON_DIST:       70.07 [deg]   
MOON_ILLUM:     75 [%]
GAL_COORDS:     67.41,-51.17 [deg] galactic lon,lat of the burst
ECL_COORDS:     342.27,5.09 [deg] ecliptic lon,lat of the burst
COMMENTS:       Possible GRB.
COMMENTS:       Possible XRB.  
COMMENTS:       WXM error box is circular; not rectangular.

GCN/BACODINE POSITION NOTICE

  
TITLE:          GCN/HETE BURST POSITION NOTICE   
NOTICE_DATE:    Wed 25 Aug 04 18:07:59 UT
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    3510,   Seq_Num: 5
GRB_DATE:       13242 TJD;   238 DOY;   04/08/25
GRB_TIME:       58897.79 SOD {16:21:37.79} UT
TRIGGER_SOURCE: Trigger on the 2-30 keV band.
WXM_SIG/NOISE:  0.1 sig/noise  on a 18.800 [sec] timescale
SC_-Z_RA:       335 [deg]
SC_-Z_DEC:       -9 [deg]
SC_LONG:        126 [deg East] 
WXM_CNTR_RA:    341.640d {+22h 46m 34s} (J2000),
                341.700d {+22h 46m 48s} (current),
                340.996d {+22h 43m 59s} (1950) 
WXM_CNTR_DEC:    -2.408d {-02d 24' 27"} (J2000),
                 -2.383d {-02d 22' 58"} (current),
                 -2.671d {-02d 40' 16"} (1950)
WXM_CORNER1:    341.6620  -2.5610 [deg]
WXM_CORNER2:    341.5080  -2.4880 [deg]
WXM_CORNER3:    341.6190  -2.2540 [deg]
WXM_CORNER4:    341.7730  -2.3280 [deg]
WXM_MAX_SIZE:   18.58 [arcmin] diameter
WXM_LOC_SN:     24 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 11.6 Y= 8.4 [sig/noise]
WXM_LC_SN:      X= 20.9 Y= 14.2 [sig/noise]
SUN_POSTN:      154.75d {+10h 18m 60s}  +10.48d {+10d 28' 40"}
SUN_DIST:       169.36 [deg]   
MOON_POSTN:     273.19d {+18h 12m 45s}  -27.82d {-27d 49' 09"}
MOON_DIST:       69.94 [deg]
MOON_ILLUM:     75 [%]
GAL_COORDS:     67.15,-51.22 [deg] galactic lon,lat of the burst
ECL_COORDS:     342.15,4.97 [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 notice #2657
P.A. Price (IfA, University of Hawaii) and R. McNaught (MSO) report:
We have observed the error circle of GRB 040825 with the SSO 40-inch telescope. We obtained a single 300 sec exposure in R band at 2004 Aug 25.778 UT (2.3 hours after the GRB), covering the entire error circle apart from 1 arcmin on the extreme Eastern edge. The limiting magnitude of our image is R ~ 19.8 mag, from comparison with the USNO-A2.0 catalogue.
Upon manual comparison with the DSS2 F plate, we do not find any afterglow candidate to the limiting magnitude of our image.
This message may be cited.
GCN notice #2658
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 notice #2659
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 notice #2662
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 notice #2663
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.
GCN notice #2667
S.maeno,E.Sonoda,Y.Matsuo, M.Yamauchi (University of Miyazaki)
We have observed the WXM error box of GRB040825B(HETE trigger 3510) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. Observed field of view is 43 arcmin centerd on (22h 46m 33s -02d 24' 16"). We have compared our images with the USNO A2.0 catalog. There is no new source brighter than 15.9mag. in our observed field at 16:44:14 UT.
GCN notice #2669
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 notice #2675
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.

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Jochen Greiner, last update: 29-Aug-2004 [Disclaimer]