Gamma-ray Burst 021020

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/HETE BURST POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Sun 20 Oct 02 20:13:18 UT
NOTICE_TYPE:    HETE S/C_Alert
TRIGGER_NUM:    2413,   Seq_Num: 1
GRB_DATE:       12567 TJD;   293 DOY;   02/10/20
GRB_TIME:       72776.59 SOD {20:12:56.59} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     147  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:        63 [deg]
SC_-Z_DEC:       18 [deg]
SC_LONG:         54 [deg East]
SUN_POSTN:      205.31d {+13h 41m 14s}  -10.50d {-10d 29' 55"}
MOON_POSTN:      22.06d {+01h 28m 14s}   +5.18d {+05d 10' 54"}
MOON_ILLUM:     100 [%]
COMMENTS:       Probable GRB.

GCN/HETE BURST POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Sun 20 Oct 02 20:15:10 UT
NOTICE_TYPE:    HETE S/C_Last
TRIGGER_NUM:    2413,   Seq_Num: 2
GRB_DATE:       12567 TJD;   293 DOY;   02/10/20
GRB_TIME:       72776.59 SOD {20:12:56.59} UT
TRIGGER_SOURCE: Trigger on the 25-400 keV band.
GAMMA_RATE:     147  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:        63 [deg]
SC_-Z_DEC:       18 [deg]
SC_LONG:         54 [deg East]
SUN_POSTN:      205.31d {+13h 41m 14s}  -10.50d {-10d 29' 55"}
MOON_POSTN:      22.06d {+01h 28m 14s}   +5.18d {+05d 10' 54"}
MOON_ILLUM:     100 [%]
COMMENTS:       Probable GRB.
COMMENTS:       There is no position known for this trigger at this time.

GCN/BACODINE POSITION NOTICE


TITLE:             GCN/IPN POSITION NOTICE
NOTICE_DATE:       Mon 21 Oct 02 19:43:03 UT
NOTICE_TYPE:       IPN Single Box
IPN_NUMBER:        397
GRB_DATE:          12567 TJD;   293 DOY;   02/10/20
GRB_TIME:          72772.00 SOD {20:12:52.00} UT
GRB_IPN_RA:        322.3306d {+21h 29m 19s} (J2000),
                   322.3543d {+21h 29m 25s} (current),
                   321.9074d {+21h 27m 38s} (1950)
GRB_IPN_DEC:       +51.9283d {+51d 55' 42"} (J2000),
                   +51.9406d {+51d 56' 26"} (current),
                   +51.7085d {+51d 42' 31"} (1950)
GRB_ERROR1_RA1:    321.9547d {+21h 27m 49s} (J2000)
GRB_ERROR1_DEC1:    51.7909d {+51d 47' 27"} (J2000)
GRB_ERROR1_RA2:    321.8273d {+21h 27m 19s} (J2000)
GRB_ERROR1_DEC2:    51.7741d {+51d 46' 27"} (J2000)
GRB_ERROR1_RA3:    322.8420d {+21h 31m 22s} (J2000)
GRB_ERROR1_DEC3:    52.0820d {+52d 04' 55"} (J2000)
GRB_ERROR1_RA4:    322.7115d {+21h 30m 51s} (J2000)
GRB_ERROR1_DEC4:    52.0654d {+52d 03' 55"} (J2000)
GRB_ERROR:         18.59 [arcmin radius of circumscribing circle, 3 sigma]
GRB_BOX_AREA:      51 [sq.arcmin]
GRB_PEAK_FLUX:     1.3e-06 [erg/cm2/sec in 25-100 keV] in a 0.25 sec interval
GRB_FLUENCE:       1.1e-05 [erg/cm2 in 25-100 keV]
GRB_DURATION:      20.0 [sec]
SUN_POSTN:         205.31d {+13h 41m 14s}  -10.50d {-10d 29' 55"}
SUN_DIST:          114.78 [deg]
MOON_POSTN:         22.06d {+01h 28m 14s}   +5.18d {+05d 10' 53"}
MOON_DIST:          67.61 [deg]
GAL_COORDS:        94.50,0.58 [deg] galactic lon,lat of the burst
ECL_COORDS:        356.18,60.71 [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 #1648
K. Hurley and T. Cline, on behalf of the Ulysses, Konus, HETE, 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,
E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, and
G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew, G. Monnelly, 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, report:
Ulysses, Mars Odyssey-GRS, Konus-Wind, and HETE-FREGATE (H2413) observed this GRB at 72772 seconds. As observed by Ulysses, it had a duration of approximately 20 seconds, a 25-100 keV fluence of approximately 1.1E-05 erg/cm2, and a peak flux of approximately 1.3E-06 erg/cm2 s over 0.25 seconds.
We have triangulated it to a preliminary, 3 sigma error box whose approximate area is 50 sq. arcmin. and whose coordinates are:
```
    RA(2000)                              DEC(2000)
 ERROR BOX CENTER:  21 h 29 m 19.34 s     51 o 55 '  42.00 " 
 ERROR BOX CORNER 1: 21 h 27 m 49.13 s     51 o 47 '  27.48 " 
 ERROR BOX CORNER 2: 21 h 27 m 18.57 s     51 o 46 '  27.06 " 
 ERROR BOX CORNER 3: 21 h 31 m 22.08 s     52 o  4 '  55.20 " 
 ERROR BOX CORNER 4: 21 h 30 m 50.76 s     52 o  3 '  55.67 " 
```
For technical reasons related to the transmission of the MO data, this triangulation requires confirmation, which we will attempt to provide as soon as possible.
This error box may be improved.
GCN notice #1650
K. Hurley and T. Cline, on behalf of the Ulysses, Konus, MO, and HETE GRB teams,
E. Mazets and S. Golenetskii, on behalf of the Konus-Wind 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
G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew, G. Monnelly, 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, report:
Ulysses, Mars Odyssey (HEND and GRS), HETE-FREGATE, and Konus-Wind observed this GRB (GCN 1648). We have confirmed the error box given in GCN 1648 and reduced it to an ~ 20. sq. arcmin. error box fully contained within the original one. Its coordinates are:
```
    RA(2000)                              DEC(2000)
 
 ERROR BOX CENTER:  21 h 29 m 10.92 s     51 o 55 '   0.43 " 
 ERROR BOX CORNER 1: 21 h 28 m 45.12 s     51 o 52 '   6.48 " 
 ERROR BOX CORNER 2: 21 h 28 m 14.32 s     51 o 51 '   6.05 " 
 ERROR BOX CORNER 3: 21 h 30 m  7.92 s     51 o 58 '  54.41 " 
 ERROR BOX CORNER 4: 21 h 29 m 36.82 s     51 o 57 '  54.33 " 
```
This error box may be improved.

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Jochen Greiner, last update: 22-Oct-2002 [Disclaimer]