Gamma-ray Burst 040810

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Tue 10 Aug 04 14:16:36 UT   
NOTICE_TYPE:    HETE S/C_Alert 
TRIGGER_NUM:    3489,   Seq_Num: 1
GRB_DATE:       13227 TJD;   223 DOY;   04/08/10
GRB_TIME:       51335.90 SOD {14:15:35.90} UT
TRIGGER_SOURCE: Trigger on the 6-80 keV band.
GAMMA_RATE:     468  [cnts/s]  on a 0.160 [sec] timescale
SC_LONG:        254 [deg East] 
SUN_POSTN:      140.72d {+09h 22m 52s}  +15.35d {+15d 20' 58"}
MOON_POSTN:      76.25d {+05h 05m 00s}  +26.20d {+26d 11' 54"}
MOON_ILLUM:     25 [%]
COMMENTS:       No s/c ACS pointing info available yet.
COMMENTS:       Probable GRB.

GCN/BACODINE POSITION NOTICE

 
TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Tue 10 Aug 04 15:16:57 UT   
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    3489,   Seq_Num: 3
GRB_DATE:       13227 TJD;   223 DOY;   04/08/10
GRB_TIME:       51335.89 SOD {14:15:35.89} UT
TRIGGER_SOURCE: Trigger on the 6-80 keV band.
GAMMA_RATE:     468  [cnts/s]  on a 0.160 [sec] timescale
SC_-Z_RA:         0 [deg]
SC_-Z_DEC:        0 [deg]
SC_LONG:        254 [deg East] 
WXM_CNTR_RA:    357.534d {+23h 50m 08s} (J2000),
                357.594d {+23h 50m 23s} (current),
                356.884d {+23h 47m 32s} (1950) 
WXM_CNTR_DEC:   -35.431d {-35d 25' 51"} (J2000),
                -35.405d {-35d 24' 18"} (current),
                -35.709d {-35d 42' 32"} (1950)
WXM_MAX_SIZE:   240.00 [arcmin] diameter
WXM_LOC_SN:     32 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 17.9 Y= 17.8 [sig/noise]
WXM_LC_SN:      X= 19.6 Y= 25.5 [sig/noise]   
SUN_POSTN:      140.72d {+09h 22m 52s}  +15.35d {+15d 20' 58"}
SUN_DIST:       141.45 [deg]
MOON_POSTN:      76.25d {+05h 05m 00s}  +26.20d {+26d 11' 54"}
MOON_DIST:       96.43 [deg]
MOON_ILLUM:     25 [%]
GAL_COORDS:     356.73,-74.52 [deg] galactic lon,lat of the burst
ECL_COORDS:     342.11,-31.19 [deg] ecliptic lon,lat of the burst
COMMENTS:       Definite GRB.
COMMENTS:       WXM error box is circular; not rectangular.  
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:    Tue 10 Aug 04 17:34:51 UT   
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    3489,   Seq_Num: 4
GRB_DATE:       13227 TJD;   223 DOY;   04/08/10
GRB_TIME:       51335.88 SOD {14:15:35.88} UT
TRIGGER_SOURCE: Trigger on the 6-80 keV band.
GAMMA_RATE:     468  [cnts/s]  on a 0.160 [sec] timescale
SC_-Z_RA:         0 [deg]
SC_-Z_DEC:        0 [deg]
SC_LONG:        254 [deg East] 
WXM_CNTR_RA:    358.532d {+23h 54m 08s} (J2000),
                358.591d {+23h 54m 22s} (current),
                357.885d {+23h 51m 32s} (1950) 
WXM_CNTR_DEC:   -35.074d {-35d 04' 25"} (J2000),
                -35.048d {-35d 02' 53"} (current),
                -35.352d {-35d 21' 07"} (1950)
WXM_MAX_SIZE:   60.00 [arcmin] diameter
WXM_LOC_SN:     32 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 17.9 Y= 17.8 [sig/noise]
WXM_LC_SN:      X= 19.6 Y= 25.5 [sig/noise]   
SUN_POSTN:      140.72d {+09h 22m 52s}  +15.35d {+15d 20' 58"}
SUN_DIST:       140.82 [deg]
MOON_POSTN:      76.25d {+05h 05m 00s}  +26.20d {+26d 11' 54"}
MOON_DIST:       95.54 [deg]
MOON_ILLUM:     25 [%]
GAL_COORDS:     356.44,-75.41 [deg] galactic lon,lat of the burst
ECL_COORDS:     343.15,-31.26 [deg] ecliptic lon,lat of the burst
COMMENTS:       Definite GRB.
COMMENTS:       WXM error box is circular; not rectangular.  
COMMENTS:       Burst_Validity flag is true.
COMMENTS:       WXM data refined since S/C_Last Notice.

GCN notice #2639
P.A. Price (IfA, University of Hawaii), M. Hauser (Landessternwarte Heidelberg-K"onigstuhl), G. Puhlhofer (MPIK) and S.J. Wagner (Landessternwarte Heidelberg-K"onigstuhl) report:
We observed a small number (4) of 18 arcmin square fields within the error box of GRB 040810 (HETE #3489/4) using the 40-inch telescope at Siding Spring Observatory in R-band at mean epoch 2004 Aug 10.761, before other time-sensitive observations became of high priority. These fields are centered at J2000 coordinates: 23:52:00 -35:04:25 ; 23:52:00 -34:49:22 ; 23:53:30 -35:11:55 ; 23:54:31 -34:56:54.
We do not identify any optical afterglow upon manual comparison with the Digitised Sky Survey 2 F plates. We estimate that the limiting magnitude of these observations are R ~ 18 mag from rough calibration with the USNO-A2.0 catalogue.
This message may be cited.
GCN notice #2641
R. Aptekar, S. Golenetskii, E. Mazets, V. Pal'shin, and D. Frederiks on behalf of Konus-Wind team, T. Cline, on behalf of the Konus-Wind GRB team, and K. Hurley, on behalf of the IPN team,
Konus-Wind detected the intense multipeak GRB 040810 (=H3489) at 14:15:43.177 s UT.
As observed by Konus-Wind, this burst had a duration of 124s, a 20-2000 keV fluence of ~1.4E-4 erg/cm2, a 20-2000 keV peak flux ~1.0E-5 erg/cm2 s over 0.256 s, Epeak for time-integrated spectrum 206 +/- 11 keV, Epeak at maximum intensity 450 +/- 45 keV.
GCN notice #2646
K. Hurley and T. Cline, on behalf of the Ulysses, HETE, Mars Odyssey, and Konus GRB teams,
I. Mitrofanov, S. Charyshnikov, V. Grinkov, A. Kozyrev, M. Litvak, and A. Sanin, on behalf of the HEND-Odyssey GRB team,
W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS-Odyssey 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, N. Butler, J.G. Jernigan, F. Martel, G. Prigozhin, A. Dullighan, J. Braga, R. Manchanda, G. Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Donaghy, C. Barraud, M. Boer, J-F Olive, and J-P Dezalay, on behalf of the HETE GRB team,
D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team, report:
Mars Odyssey (HEND), Konus-Wind, HETE (FREGATE and WXM), and RHESSI observed this burst. Ulysses was off. HETE Ground Analysis produced two error circles for it, distributed as GCN Notices Sequence 3 and 4. The burst occurred after HETE sunrise, at orbital phase=0.78, just as the science instruments were being shut off; as a result, HETE observed only the precursor to this long, intense event (GCN 2641, Aptekar et al.). The HETE star trackers were also off at the time of the burst, so spacecraft aspect could only be established crudely using the spacecraft sun sensors.
We have triangulated this burst to two annuli, whose coordinates are RA, Decl = 332.624, -12.452 degrees, with radius 34.105 +/-0.014 degrees, and RA, Decl = 309.285, -21.748 degrees, with radius 46.199 +/- 1.815 degrees (3 sigma values). These annuli intersect to form an error box whose area is ~780 sq. arcmin., and whose corners are given by:
```
   RA      Decl.
  2.438  -33.023 
357.554  -38.402
  2.438  -32.967
357.562  -38.353
```
The larger of the two IPN annuli encompasses parts of both HETE WXM error circles. The smaller annulus, however, intersects the larger WXM error circle in Sequence Number 3, but not the smaller one given in Sequence Number 4. The intersection forms an error box whose area is ~90 sq. arcmin., and whose corners are given by:
```
RA        Decl.
359.134  -36.959
359.716  -36.366
359.002  -37.043 
359.788  -36.244
```
A map has been posted at ssl.berkeley.edu/ipn3/040810

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Jochen Greiner, last update: 30-Aug-2004 [Disclaimer]