Gamma-ray Burst 021016

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Wed 16 Oct 02 10:32:37 UT
NOTICE_TYPE:    HETE S/C_Alert 
TRIGGER_NUM:    2397,   Seq_Num: 1
GRB_DATE:       12563 TJD;   289 DOY;   02/10/16 
GRB_TIME:       37740.75 SOD {10:29:00.75} UT
TRIGGER_SOURCE: Trigger on the 6-120 keV band.
GAMMA_RATE:     384  [cnts/s]  on a 5.200 [sec] timescale
SC_LONG:        276 [deg East] 
SUN_POSTN:      201.18d {+13h 24m 42s}   -8.90d {-08d 54' 00"}
MOON_POSTN:     333.73d {+22h 14m 55s}  -16.30d {-16d 18' 10"}
MOON_ILLUM:     80 [%]
COMMENTS:       No s/c ACS pointing info available yet. 
COMMENTS:       Probable GRB.

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Wed 16 Oct 02 12:13:04 UT
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    2397,   Seq_Num: 3
GRB_DATE:       12563 TJD;   289 DOY;   02/10/16 
GRB_TIME:       37740.74 SOD {10:29:00.74} UT
TRIGGER_SOURCE: Trigger on the 6-120 keV band.
GAMMA_RATE:     384  [cnts/s]  on a 5.200 [sec] timescale
SC_-Z_RA:         0 [deg]
SC_-Z_DEC:        0 [deg]      
SC_LONG:        276 [deg East] 
WXM_CNTR_RA:    359.805d {+23h 59m 13s} (J2000),
                359.841d {+23h 59m 22s} (current),
                359.168d {+23h 56m 40s} (1950)
WXM_CNTR_DEC:   +50.642d {+50d 38' 33"} (J2000), 
                +50.658d {+50d 39' 29"} (current),
                +50.364d {+50d 21' 51"} (1950)
WXM_CORNER1:      3.9710  49.1940 [deg]
WXM_CORNER2:    355.8860  52.3430 [deg]
WXM_CORNER3:    355.6650  52.0940 [deg]
WXM_CORNER4:      3.7000  48.9390 [deg]
WXM_MAX_SIZE:   360.33 [arcmin] diameter
WXM_LOC_SN:     4 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 4.5 Y= 0.0 [sig/noise]
WXM_LC_SN:      X= 6.0 Y= 0.0 [sig/noise]
SUN_POSTN:      201.18d {+13h 24m 42s}   -8.90d {-08d 54' 00"}
SUN_DIST:       134.67 [deg] 
MOON_POSTN:     333.73d {+22h 14m 55s}  -16.30d {-16d 18' 10"}
MOON_DIST:       70.78 [deg]  
MOON_ILLUM:     80 [%]
GAL_COORDS:     114.53,-11.38 [deg] galactic lon,lat of the burst
ECL_COORDS:     25.73,45.26 [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/BACODINE POSITION NOTICE


TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Wed 16 Oct 02 20:18:15 UT
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    2397,   Seq_Num: 4
GRB_DATE:       12563 TJD;   289 DOY;   02/10/16
GRB_TIME:       37740.74 SOD {10:29:00.74} UT
TRIGGER_SOURCE: Trigger on the 6-120 keV band.
GAMMA_RATE:     384  [cnts/s]  on a 5.200 [sec] timescale
SC_-Z_RA:         0 [deg]
SC_-Z_DEC:        0 [deg]
SC_LONG:        276 [deg East]
WXM_CNTR_RA:      2.768d {+00h 11m 04s} (J2000),
                  2.805d {+00h 11m 13s} (current),
                  2.114d {+00h 08m 27s} (1950)
WXM_CNTR_DEC:   +49.139d {+49d 08' 20"} (J2000),
                +49.154d {+49d 09' 15"} (current),
                +48.861d {+48d 51' 38"} (1950)
WXM_CORNER1:      9.6470  45.9630 [deg]
WXM_CORNER2:    355.8590  52.3120 [deg]
WXM_CORNER3:    355.6930  52.1250 [deg]
WXM_CORNER4:      9.8730  46.1550 [deg]
WXM_MAX_SIZE:   659.18 [arcmin] diameter
WXM_LOC_SN:     4 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 4.5 Y= 0.0 [sig/noise]
WXM_LC_SN:      X= 6.0 Y= 0.0 [sig/noise]
SUN_POSTN:      201.18d {+13h 24m 42s}   -8.90d {-08d 54' 00"}
SUN_DIST:       136.91 [deg]
MOON_POSTN:     333.73d {+22h 14m 55s}  -16.30d {-16d 18' 10"}
MOON_DIST:       70.35 [deg]
MOON_ILLUM:     80 [%]
GAL_COORDS:     116.17,-13.20 [deg] galactic lon,lat of the burst
ECL_COORDS:     26.78,42.95 [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 #1639
K. Hurley and T. Cline, on behalf of the Ulysses and HETE GRB teams, 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 and HETE-FREGATE observed this GRB at 37740 seconds (HETE 2397). As observed by Ulysses, it had a duration of approximately 50 seconds, a 25-100 keV fluence of approximately 3.7E-6 erg/cm2, and a peak flux of approximately 3.8E-07 erg/cm2 s over 0.50 seconds.
We have triangulated it to a preliminary, 3 sigma annulus centered at RA, Decl= 357.102, -36.223 degrees, whose radius is 83.633 +/- 0.057 degrees. This annulus intersects the one-dimensional HETE WXM error box (GCN/HETE Burst Position Notice, Sequence Number 4) to form an error box whose approximate area is 50 sq. arcmin. and whose coordinates are:
```
    RA(2000)                              DEC(2000)

 ERROR BOX CENTER:    0 h 33 m 43.62 s  46 o 47 ' 16.00 " 
 ERROR BOX CORNER 1:  0 h 31 m 42.34 s  46 o 54 ' 04.11 "
 ERROR BOX CORNER 2:  0 h 32 m 47.71 s  46 o 45 ' 23.28 " 
 ERROR BOX CORNER 3:  0 h 34 m 39.74 s  46 o 49 ' 13.78 "
 ERROR BOX CORNER 4:  0 h 35 m 44.71 s  46 o 40 ' 25.61 "
```
This error may be improved.
GCN notice #1640
The area of the error box in GCN 1639 is approximately 200 sq. arcmin., not 50 sq. arcmin.
GCN notice #1641
C. Graziani, Y. Shirasaki, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, and T. Donaghy, on behalf of the HETE WXM Team;
G. Ricker, J-L Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf of the HETE Science Team;
J. Villasenor, R. Vanderspek, J. Doty, G. Crew, G. Monnelly, N. Butler, T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams;
M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf of the HETE FREGATE Team;
write:
At 10:29:00.75 UTC (37740.75 s UT) on 16 Oct 2002, the HETE FREGATE and WXM instruments detected event H2397, a long GRB.
The burst occurred inside the FREGATE FOV, but at 35 degrees off the WXM boresight and illuminated only two of the twelve wires of the WXM. Ground analysis of the WXM data for the burst produced a location in the X-direction from the shadow pattern of the coded aperture mask on these two wires, and a location in the Y-direction from geometrical constraints. A final WXM location was reported in a GCN Notice at 20:18:15 UT. The WXM localization SNR in the X-detector was 6. The WXM location can be expressed as a 90% confidence rectangle that is approximately 14 arcminutes in width and 11 degrees in length. The corners of the rectangle lie at the following J2000 coordinates:
```
 RA = 00h 38m 35s, Dec = 45o 57' 47"
 RA = 23h 43m 26s, Dec = 52o 18' 43"
 RA = 23h 42m 46s, Dec = 52o 07' 30"
 RA = 00h 39m 30s, Dec = 46o 09' 18".
```
GCN Circulars No. 1639 and 1640 reported a combined HETE/Ulysses IPN diamond-shaped localization region that has an area of approximately 200 sq. arcminutes.
In the FREGATE 8-40 keV and the WXM 2-25 keV bands, the burst had a duration of ~90 seconds.
A light curve and skymap for GRB021016 are provided at the following URL:
http://space.mit.edu/HETE/Bursts/
This message is citable.
GCN notice #1644
D. T. Durig, E. W. Shroyer, P. P. Shukla (Cordell-Lorenz) and D. West (West Skies) report on behalf of the AAVSO International GRB network:
We have observed the entire error box for GRB021016 (Hurley et al. GCN 1639; Graziani et al. GCN 1641) on two nights. Comparing against the DSS and USNO-A2.0, no new object is seen inside the error box. The FITS images are available through the AAVSO. CV indicates unfiltered (clear), V-band zeropoint; CR indicates unfiltered (clear), R-band zeropoint.
```
     UTD    start  exposure filt  telescope  lim_mag
    021017  01:44  45secx32  CV  0.20m West   18.5
    021017  03:18  300secx3  CR  0.30m Durig  19.5
    021018  03:30  300secx3  CR  0.30m Durig  20.0
```

GCN notice #1646
S. Klose and U. Laux (Thueringer Landessternwarte Tautenburg)
report:
The error box of GRB 021016 (Hurley et al., GCN 1639) was imaged in R and I on October 18/19 and 20/21 (2.3 and 4.3 days after the burst trigger, respectively), using the Tautenburg Schmidt telescope equipped with the Schmidt focus CCD camera (2k x 2k; FOV 42 x 42 arcmin). Several frames were taken (2 min exposure time each). The limiting magnitude of the combined frames of each observing run is about R=20.5 +/- 0.5 and I=20.5 +/- 0.5.
We do not find any potential GRB afterglow, neither in the R-band nor in the I-band.
This message can be cited.

GCN notice #1681
J. Schaefer, S. Savage, S. Hwang, R. Canterna (U. Wyoming), M. Nysewander, and D. Reichart (U. North Carolina) report:
We observed the entire ~200 square arcminute error box of GRB 021016 (GCN 1639, 1640, 1641) with the 0.6-meter Red Buttes Observatory telescope beginning 15 hours, 39 hours, and 63 hours after the burst. We integrated without filter for ~1 hour per pointing x three pointings for each epoch.
Visual comparison between our first epoch and the DSS on the 17th revealed no obvious counterpart to the limiting magnitude of the DSS. Visual comparison between our first and second epochs on the 18th and our first and third epochs on the 19th revealed no obvious counterpart to the limiting magnitude of our first epoch, which we estimate to be V ~ 22 mag.
Given the large error box and crowed field, we have confirmed this result using the image differencing code ISIS-2 (Alard 2000).

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Jochen Greiner, last update: 11-Nov-2002 [Disclaimer]