Gamma-ray Burst 021008

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN notice #1617
K. Hurley, on behalf of the Ulysses GRB team,
E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, and
T. Cline, on behalf of the Ulysses and Konus GRB teams, report:
Ulysses and Konus observed this burst at 25250 s. As observed by Ulysses, it had a duration ~30 s, a 25-100 keV fluence of 8.5E-5 erg/cm2, and a peak flux over 0.5 s of 1.3E-5 erg/cm2 s. We have triangulated it to a preliminary annulus centered at RA, Decl (2000)=175.616, 36.839 degrees, whose radius is 14.065+/-0.126 degrees.
This annulus can be constrained further, but at this point it is not clear whether the event was observed by Mars Odyssey, and thus whether an error box can be derived for it.
GCN notice #1625
K. Hurley and T. Cline, on behalf of the Ulysses, Konus, and Mars Odyssey GRB teams,
I. Mitrofanov, D. Anfimov, 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, and
E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, report:
This burst (GCN 1617) was also observed by Mars Odyssey (HEND and GRS). We have triangulated it to two preliminary, 3 sigma error boxes whose approximate areas are 65 sq. arcmin. each and whose coordinates are:
```
    RA(2000)                              DEC(2000)
 
 ERROR BOX CENTER:  12 h 45 m 47.73 s     44 o 10 '  59.79 " 
 ERROR BOX CORNER 1: 12 h 46 m 19.03 s     44 o  8 '  30.23 " 
 ERROR BOX CORNER 2: 12 h 45 m 58.90 s     44 o 15 '  55.20 " 
 ERROR BOX CORNER 3: 12 h 45 m 36.49 s     44 o  6 '   4.47 " 
 ERROR BOX CORNER 4: 12 h 45 m 16.22 s     44 o 13 '  29.11 "

or

 ERROR BOX CENTER:  10 h 38 m 18.98 s    43 o 52 ' 24.06 "
 ERROR BOX CORNER 5: 10 h 37 m 48.22 s   43 o 49 '  45.70 "
 ERROR BOX CORNER 6: 10 h 38 m  7.15 s   43 o 57 '  16.21 "
 ERROR BOX CORNER 7: 10 h 38 m 30.87 s   43 o 47 '  32.04 "
 ERROR BOX CORNER 8: 10 h 38 m 49.95 s   43 o 55 '   2.27 "
```
There is a strong probability, which cannot be quantified at the moment, that the former is in fact the correct one. We will attempt to confirm this. These error boxes can be improved.

GCN/BACODINE POSITION NOTICE


TITLE:             GCN/IPN POSITION NOTICE
NOTICE_DATE:       Fri 11 Oct 02 21:03:13 UT
NOTICE_TYPE:       IPN Single Box
IPN_NUMBER:        389
GRB_DATE:          12555 TJD;   281 DOY;   02/10/08
GRB_TIME:          25250.00 SOD {07:00:50.00} UT
GRB_IPN_RA:        191.4488d {+12h 45m 48s} (J2000),
                   191.4813d {+12h 45m 56s} (current),
                   190.8609d {+12h 43m 27s} (1950)
GRB_IPN_DEC:       +44.1832d {+44d 10' 60"} (J2000),
                   +44.1681d {+44d 10' 05"} (current),
                   +44.4563d {+44d 27' 23"} (1950)
GRB_ERROR1_RA1:    191.5792d {+12h 46m 19s} (J2000)
GRB_ERROR1_DEC1:    44.1417d {+44d 08' 30"} (J2000)
GRB_ERROR1_RA2:    191.4954d {+12h 45m 59s} (J2000)
GRB_ERROR1_DEC2:    44.2653d {+44d 15' 55"} (J2000)
GRB_ERROR1_RA3:    191.4020d {+12h 45m 36s} (J2000)
GRB_ERROR1_DEC3:    44.1012d {+44d 06' 04"} (J2000)
GRB_ERROR1_RA4:    191.3175d {+12h 45m 16s} (J2000)
GRB_ERROR1_DEC4:    44.2247d {+44d 13' 29"} (J2000)
GRB_ERROR:         6.16 [arcmin radius of circumscribing circle, 3 sigma]
GRB_BOX_AREA:      65 [sq.arcmin]
GRB_PEAK_FLUX:     1.3e-05 [erg/cm2/sec in 25-100 keV] in a 0.50 sec interval
GRB_FLUENCE:       8.5e-05 [erg/cm2 in 25-100 keV]
GRB_DURATION:      30.0 [sec]
SUN_POSTN:         193.66d {+12h 54m 38s}   -5.84d {-05d 50' 37"}
SUN_DIST:           50.05 [deg]
MOON_POSTN:        218.86d {+14h 35m 26s}  -12.50d {-12d 30' 03"}
MOON_DIST:          61.90 [deg]
GAL_COORDS:        126.38,72.91 [deg] galactic lon,lat of the burst
ECL_COORDS:        168.22,44.11 [deg] ecliptic lon,lat of the burst
COMMENTS:          IPN triangulation localization.  
COMMENTS:          This is a preliminary, 3 sigma error box.  
COMMENTS:          GCN message is being issued.

GCN notice #1629
K. Hurley and T. Cline, on behalf of the Ulysses, Konus, and Mars Odyssey GRB teams,
D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team,
I. Mitrofanov, D. Anfimov, 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, and
E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, report:
This burst (GCN 1617 and 1625) was also observed by RHESSI. Triangulation confirms that the first error box in GCN 1625 is indeed the correct one:
```
    RA(2000)                              DEC(2000)
 
 ERROR BOX CENTER:  12 h 45 m 47.73 s     44 o 10 '  59.79 " 
 ERROR BOX CORNER 1: 12 h 46 m 19.03 s     44 o  8 '  30.23 " 
 ERROR BOX CORNER 2: 12 h 45 m 58.90 s     44 o 15 '  55.20 " 
 ERROR BOX CORNER 3: 12 h 45 m 36.49 s     44 o  6 '   4.47 " 
 ERROR BOX CORNER 4: 12 h 45 m 16.22 s     44 o 13 '  29.11 " 
```
This error box can be improved.
GCN notice #1642
A. J. Castro-Tirado (IAA-CSIC, Granada), S. Klose (TLS, Tautenburg), L. Wisotzki, S. Huferath (AIP, Potsdam), J. Greiner (MPE, Garching), J. M. Castro Ceron (ROA, San Fernando), and J. Gorosabel (IAA-CSIC)
report:
Following the detection of the very high fluence gamma-ray burst GRB 021008 (GCN 1617, 1625), we have observed the IPN error box given by Hurley et al. (GCN 1629) with the 2.2m telescope at Calar Alto (Spain) on Oct 14.21 UT (3 x 200 sec, I band) and Oct 15.21 UT (5 x 200 sec, R band) at a high airmass, just before the twilight (5.9 and 6.9 days, respectively, after the burst trigger). The combined R-band image goes ~1 mag deeper than the corresponding DSS-2 red image. No optical transient is found down to the DSS-2 limit (R ~ 20).
This message can be cited.
GCN notice #1647
D. A. Frail (NRAO), and E. Berger (Caltech) report on behalf of a larger collaboration:
"We have used the VLA to observe the IPN error box (GCN 1629) for the gamma-ray burst GRB 021008 on 2002 Oct. 17.7 and Oct. 19.8 UT at a frequency of 4.86 GHz and 8.46 GHz. At 4.86 GHz the entire error box was imaged, while at 8.46 only the inner half was imaged. There are no radio sources in this area at either frequency at or above a level of 175 uJy (5-sigma).
No further observations are planned."

Back to JG's homepage

Jochen Greiner, last update: 21-Oct-2002 [Disclaimer]