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[vsnet-j 2321] GRB 021004


皆様

以下のように可視光の残光が発見されたようです。

可能な方は追観測してみてはいかがでしょうか。

					鳥居研一

===
TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1564
SUBJECT: GRB021004: Optical Afterglow
DATE:    02/10/04 15:12:59 GMT
FROM:    Derek Fox at CIT  <derekfox@astro.caltech.edu>

D.W. Fox reports on behalf of the Caltech-NRAO GRB Collaboration:  

"We have observed the error box of GRB021004 (HETE Trigger 2380;
trigger time 12:06:13.57 UT) with the 48-inch Oschin/NEAT robotic
telescope at Palomar Observatory, with three 60-second integrations
beginning at 12:15:11, 12:17:45, and 12:22:52 UT.  We identify a new,
stationary, fading, point-like object by comparison with the Digitized
Sky Survey.  The object coordinates are:

    RA 00:26:54.689, Dec +18:55:41.3   (J2000)

with an uncertainty of less than 0.5" in each coordinate.  Deriving an
R-band photometric zero-point for our unfiltered observations by
reference to the USNO star at 00:26:58.713 +18:56:56.61, which we
assume to have magnitude R=15.3, we find object magnitudes at our
three mean epochs of:

         Mean Epoch  
       UT      From GRB   Magnitude
  ========================================
    12:15:41 UT   567 s   15.34 mag
    12:18:15      721     15.49
    12:23:22     1028     15.78
  ========================================

Given the source brightness and fading behavior we identify the object
as the likely optical afterglow of GRB021004.  A finding chart from
these observations may be found at

    http://vsnet.astro.caltech.edu/~derekfox/grb021004/finder.ps.gz

and a web page presenting the observations will be available soon at
http://vsnet.astro.caltech.edu/~derekfox/grb021004/.";


>> 
>> 皆様
>> 
>> 先ほどの続きですが、座標が少々改訂されました。
>> 
>> WXM_CNTR_RA:      6.694d {+00h 26m 47s} (J2000),
>> WXM_CNTR_DEC:   +18.987d {+18d 59' 13"} (J2000),
>> 
>> 					鳥居研一
>> 
>> 以下、[vsnet-grb 544] の転送です。
>> 
>> TITLE:          GCN/HETE BURST POSITION NOTICE
>> NOTICE_DATE:    Fri 04 Oct 02 13:19:54 UT
>> NOTICE_TYPE:    HETE Ground Analysis
>> TRIGGER_NUM:    2380,   Seq_Num: 5
>> GRB_DATE:       12551 TJD;   277 DOY;   02/10/04
>> GRB_TIME:       43573.57 SOD {12:06:13.57} UT
>> TRIGGER_SOURCE: Trigger on the 25-400 keV band.
>> GAMMA_RATE:     133  [cnts/s]  on a 5.200 [sec] timescale
>> SC_-Z_RA:        10 [deg]
>> SC_-Z_DEC:        6 [deg]
>> SC_LONG:        186 [deg East]
>> WXM_CNTR_RA:      6.694d {+00h 26m 47s} (J2000),
>>                   6.730d {+00h 26m 55s} (current),
>>                   6.043d {+00h 24m 10s} (1950)
>> WXM_CNTR_DEC:   +18.987d {+18d 59' 13"} (J2000),
>>                 +19.002d {+19d 00' 08"} (current),
>>                 +18.710d {+18d 42' 37"} (1950)
>> WXM_MAX_SIZE:   20.00 [arcmin] diameter
>> WXM_LOC_SN:     7 sig/noise (pt src in image)
>> WXM_IMAGE_SN:   X= 5.3 Y= 5.3 [sig/noise]
>> WXM_LC_SN:      X= 12.5 Y= 12.5 [sig/noise]
>> SUN_POSTN:      190.20d {+12h 40m 48s}   -4.39d {-04d 23' 25"}
>> SUN_DIST:       165.00 [deg]
>> MOON_POSTN:     166.30d {+11h 05m 13s}  +11.33d {+11d 19' 42"}
>> MOON_DIST:      143.59 [deg]
>> MOON_ILLUM:     6 [%]
>> GAL_COORDS:     114.88,-43.50 [deg] galactic lon,lat of the burst
>> ECL_COORDS:     13.79,14.75 [deg] ecliptic lon,lat of the burst
>> COMMENTS:       Definite GRB.
>> COMMENTS:       WXM error box is circular; not rectangular.
>> COMMENTS:       Burst_Validity flag is true.
>> 
>> >> vsnet-jの皆様
>> >> 
>> >>  HETE-2衛星がγ線バーストをとらえたようです。
>> >> 
>> >> 可能な方は観測してみてはいかがでしょうか。
>> >> 
>> >> 速報の座標は以下のように出ました。
>> >> WXM_CNTR_RA:      6.773d {+00h 27m 05s} (J2000),
>> >> WXM_CNTR_DEC:   +19.102d {+19d 06' 08"} (J2000),
>> >> 
>> >> 位置は今後、改訂される可能性があります。
>> >> 今後の情報は vsnet-grb-info 等を参考にして下さい。
>> >> 
>> >> 観測に関するお問い合わせも歓迎いたします。
>> >> 
>> >> 					鳥居研一
>> >> 					torii@crab.riken.go.jp
>> >> 
>> >> ------- Forwarded Message
>> >> 
>> >> TITLE:          GCN/HETE BURST POSITION NOTICE
>> >> NOTICE_DATE:    Fri 04 Oct 02 12:09:31 UT
>> >> NOTICE_TYPE:    HETE S/C_Update
>> >> TRIGGER_NUM:    2380,   Seq_Num: 3
>> >> GRB_DATE:       12551 TJD;   277 DOY;   02/10/04
>> >> GRB_TIME:       43573.57 SOD {12:06:13.57} UT
>> >> TRIGGER_SOURCE: Trigger on the 25-400 keV band.
>> >> GAMMA_RATE:     133  [cnts/s]  on a 5.200 [sec] timescale
>> >> SC_-Z_RA:        10 [deg]
>> >> SC_-Z_DEC:        6 [deg]
>> >> SC_LONG:        186 [deg East]
>> >> WXM_CNTR_RA:      6.773d {+00h 27m 05s} (J2000),
>> >>                   6.809d {+00h 27m 14s} (current),
>> >>                   6.121d {+00h 24m 29s} (1950)
>> >> WXM_CNTR_DEC:   +19.102d {+19d 06' 08"} (J2000),
>> >>                 +19.117d {+19d 07' 03"} (current),
>> >>                 +18.826d {+18d 49' 32"} (1950)
>> >> WXM_MAX_SIZE:   60.00 [arcmin] diameter
>> >> WXM_LOC_SN:     3 sig/noise (pt src in image)
>> >> WXM_IMAGE_SN:   X= 2.2 Y= 3.2 [sig/noise]
>> >> WXM_LC_SN:      X= 6.0 Y= 7.5 [sig/noise]
>> >> SUN_POSTN:      190.20d {+12h 40m 48s}   -4.39d {-04d 23' 25"}
>> >> SUN_DIST:       164.91 [deg]
>> >> MOON_POSTN:     166.30d {+11h 05m 13s}  +11.33d {+11d 19' 42"}
>> >> MOON_DIST:      143.46 [deg]
>> >> MOON_ILLUM:     6 [%]
>> >> GAL_COORDS:     115.01,-43.39 [deg] galactic lon,lat of the burst
>> >> ECL_COORDS:     13.91,14.83 [deg] ecliptic lon,lat of the burst
>> >> COMMENTS:       Probable GRB.
>> >> COMMENTS:       WXM error box is circular; not rectangular.
>> >> COMMENTS:       WXM S/N is less than a reasonable value.
>> >> 
>> >> 
>> >> ------- End of Forwarded Message
>> >> 
>>

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