GRB 021016

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.

The area of the error box in GCN 1639
Loading...
 
  is approximately 200 sq. arcmin.,
not 50 sq. arcmin.

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.

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
Loading...
 
 ; Graziani et al. GCN 1641
Loading...
 
 )
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

S. Klose and U. Laux (Thueringer Landessternwarte Tautenburg)

report:


The error box of GRB 021016 (Hurley et al., GCN 1639
Loading...
 
 ) 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.

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
Loading...
 
 , 1640
Loading...
 
 , 1641
Loading...
 
 ) 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).