Gamma-ray Burst 050123

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE notice

TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Sun 23 Jan 05 10:23:01 UT
NOTICE_TYPE:    HETE S/C_Alert 
TRIGGER_NUM:    3666,   Seq_Num: 1
GRB_DATE:       13393 TJD;    23 DOY;   05/01/23 
GRB_TIME:       37373.69 SOD {10:22:53.69} UT     
TRIGGER_SOURCE: Trigger on the 6-80 keV band.     
GAMMA_RATE:     336  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       154 [deg] 
SC_-Z_DEC:       13 [deg]
SC_LONG:        160 [deg East] 
SUN_POSTN:      305.83d {+20h 23m 18s}  -19.37d {-19d 22' 00"}
MOON_POSTN:     103.13d {+06h 52m 31s}  +27.70d {+27d 42' 15"}
MOON_ILLUM:     96 [%]
COMMENTS:       Probable GRB.

GCN/BACODINE notice

 
TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Sun 23 Jan 05 10:23:15 UT
NOTICE_TYPE:    HETE S/C_Update
TRIGGER_NUM:    3666,   Seq_Num: 2
GRB_DATE:       13393 TJD;    23 DOY;   05/01/23 
GRB_TIME:       37373.69 SOD {10:22:53.69} UT     
TRIGGER_SOURCE: Trigger on the 6-80 keV band.     
GAMMA_RATE:     336  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       154 [deg] 
SC_-Z_DEC:       13 [deg]
SC_LONG:        160 [deg East] 
WXM_CNTR_RA:    157.633d {+10h 30m 32s} (J2000),  
                157.696d {+10h 30m 47s} (current),
                157.015d {+10h 28m 04s} (1950)
WXM_CNTR_DEC:   -11.872d {-11d 52' 17"} (J2000),
                -11.898d {-11d 53' 51"} (current),
                -11.615d {-11d 36' 52"} (1950)
WXM_MAX_SIZE:   60.00 [arcmin] diameter
WXM_LOC_SN:     4 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 3.2 Y= 3.2 [sig/noise]
WXM_LC_SN:      X= 2.5 Y= 2.5 [sig/noise]     
SUN_POSTN:      305.83d {+20h 23m 18s}  -19.37d {-19d 22' 00"}
SUN_DIST:       135.69 [deg]   
MOON_POSTN:     103.13d {+06h 52m 31s}  +27.70d {+27d 42' 15"}
MOON_DIST:       66.02 [deg]  
MOON_ILLUM:     96 [%]
GAL_COORDS:     257.06,38.15 [deg] galactic lon,lat of the burst
ECL_COORDS:     163.98,-19.69 [deg] ecliptic lon,lat of the burst
COMMENTS:       Probable GRB.
COMMENTS:       WXM error box is circular; not rectangular.

GCN/BACODINE notice

 
TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Sun 23 Jan 05 10:23:28 UT
NOTICE_TYPE:    HETE S/C_Update
TRIGGER_NUM:    3666,   Seq_Num: 3
GRB_DATE:       13393 TJD;    23 DOY;   05/01/23 
GRB_TIME:       37373.69 SOD {10:22:53.69} UT     
TRIGGER_SOURCE: Trigger on the 6-80 keV band.     
GAMMA_RATE:     336  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       154 [deg] 
SC_-Z_DEC:       13 [deg]
SC_LONG:        160 [deg East] 
WXM_CNTR_RA:    157.890d {+10h 31m 34s} (J2000),  
                157.953d {+10h 31m 49s} (current),
                157.271d {+10h 29m 05s} (1950)
WXM_CNTR_DEC:   -11.571d {-11d 34' 13"} (J2000),
                -11.597d {-11d 35' 47"} (current),
                -11.313d {-11d 18' 47"} (1950)
WXM_MAX_SIZE:   28.00 [arcmin] diameter
WXM_LOC_SN:     9 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 6.0 Y= 7.5 [sig/noise]
WXM_LC_SN:      X= 5.5 Y= 7.2 [sig/noise]     
SUN_POSTN:      305.83d {+20h 23m 18s}  -19.37d {-19d 22' 00"}
SUN_DIST:       135.72 [deg]   
MOON_POSTN:     103.13d {+06h 52m 31s}  +27.70d {+27d 42' 15"}
MOON_DIST:       66.03 [deg]  
MOON_ILLUM:     96 [%]
GAL_COORDS:     257.06,38.54 [deg] galactic lon,lat of the burst
ECL_COORDS:     164.10,-19.31 [deg] ecliptic lon,lat of the burst
COMMENTS:       Probable GRB.
COMMENTS:       WXM error box is circular; not rectangular.

GCN/BACODINE notice

 
TITLE:          GCN/HETE BURST POSITION NOTICE
NOTICE_DATE:    Sun 23 Jan 05 10:26:27 UT
NOTICE_TYPE:    HETE S/C_Last  
TRIGGER_NUM:    3666,   Seq_Num: 4
GRB_DATE:       13393 TJD;    23 DOY;   05/01/23 
GRB_TIME:       37373.69 SOD {10:22:53.69} UT     
TRIGGER_SOURCE: Trigger on the 6-80 keV band.     
GAMMA_RATE:     336  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       154 [deg] 
SC_-Z_DEC:       13 [deg]
SC_LONG:        160 [deg East] 
WXM_CNTR_RA:    157.890d {+10h 31m 34s} (J2000),  
                157.953d {+10h 31m 49s} (current),
                157.271d {+10h 29m 05s} (1950)
WXM_CNTR_DEC:   -11.571d {-11d 34' 13"} (J2000),
                -11.597d {-11d 35' 47"} (current),
                -11.313d {-11d 18' 47"} (1950)
WXM_MAX_SIZE:   28.00 [arcmin] diameter
WXM_LOC_SN:     9 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 6.0 Y= 7.5 [sig/noise]
WXM_LC_SN:      X= 5.5 Y= 7.2 [sig/noise]     
SUN_POSTN:      305.83d {+20h 23m 18s}  -19.37d {-19d 22' 00"}
SUN_DIST:       135.72 [deg]   
MOON_POSTN:     103.13d {+06h 52m 31s}  +27.70d {+27d 42' 15"}
MOON_DIST:       66.03 [deg]  
MOON_ILLUM:     96 [%]
GAL_COORDS:     257.06,38.54 [deg] galactic lon,lat of the burst
ECL_COORDS:     164.10,-19.31 [deg] ecliptic lon,lat of the burst
COMMENTS:       Probable GRB.
COMMENTS:       WXM error box is circular; not rectangular.

red DSS finding chart ps-file

GCN/BACODINE notice

 
TITLE:          GCN/HETE BURST POSITION NOTICE   
NOTICE_DATE:    Sun 23 Jan 05 11:39:39 UT 
NOTICE_TYPE:    HETE Ground Analysis
TRIGGER_NUM:    3666,   Seq_Num: 5
GRB_DATE:       13393 TJD;    23 DOY;   05/01/23     
GRB_TIME:       37373.69 SOD {10:22:53.69} UT     
TRIGGER_SOURCE: Trigger on the 6-80 keV band.     
GAMMA_RATE:     336  [cnts/s]  on a 1.300 [sec] timescale
SC_-Z_RA:       154 [deg]
SC_-Z_DEC:       13 [deg]      
SC_LONG:        160 [deg East] 
WXM_CNTR_RA:    157.901d {+10h 31m 36s} (J2000),
                157.964d {+10h 31m 51s} (current),
                157.282d {+10h 29m 08s} (1950)
WXM_CNTR_DEC:   -11.475d {-11d 28' 29"} (J2000),
                -11.501d {-11d 30' 03"} (current),
                -11.218d {-11d 13' 02"} (1950)
WXM_CORNER1:    157.9550 -11.6920 [deg]
WXM_CORNER2:    157.7030 -11.6170 [deg]
WXM_CORNER3:    157.8470 -11.2570 [deg]
WXM_CORNER4:    158.0990 -11.3340 [deg] 
WXM_MAX_SIZE:   28.82 [arcmin] diameter   
WXM_LOC_SN:     14 sig/noise (pt src in image)
WXM_IMAGE_SN:   X= 8.1 Y= 7.8 [sig/noise]
WXM_LC_SN:      X= 8.8 Y= 11.0 [sig/noise]
SUN_POSTN:      305.83d {+20h 23m 18s}  -19.37d {-19d 22' 00"}
SUN_DIST:       135.78 [deg]
MOON_POSTN:     103.13d {+06h 52m 31s}  +27.70d {+27d 42' 15"}
MOON_DIST:       65.98 [deg]
MOON_ILLUM:     96 [%]         
GAL_COORDS:     256.99,38.62 [deg] galactic lon,lat of the burst
ECL_COORDS:     164.07,-19.22 [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 #2966
GRB 050123 (=H3666): A GRB Localized in Real Time by HETE
K. Hurley, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, on behalf of the HETE Science Team;
T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka, Y. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki, T. Tamagawa, Y. Urata, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on behalf of the HETE WXM Team;
R. Vanderspek, N. Butler, G. Crew, J. Doty, G. Prigozhin, J. Villasenor, J. G. Jernigan, A. Levine, 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, and J-P Dezalay, on behalf of the HETE FREGATE Team;
report:
HETE detected GRB 050123 at 10:22:54 (37374 s SOD) on 23 January 2005. GRB 050123 consists of a single peak of ~10 seconds duration and is clearly seen in both the 7-30 keV and 30-400 keV bands.
The burst was localized in flight to coordinates RA = 10h 31m 33.5s, Dec = -11d 34m 15s (J2000) with a radius of 14'. The first flight localization was distributed 22 seconds after the burst trigger.
Ground analyses of the burst allow us to refine the error box of GRB 050123 to a box with corners
```
    RA = 10h 31m 49.2s Dec = -11d 41m 31s (J2000)
    RA = 10h 30m 48.7s Dec = -11d 37m 01s
    RA = 10h 31m 23.2s Dec = -11d 15m 25s
    RA = 10h 32m 23.7s Dec = -11d 20m 02s
```
Preliminary spectral analysis of the burst give a 30-400 keV fluence of 2e-6 erg/cm2 and an Epeak of 80 keV.
Details of this burst may be found at
http://space.mit.edu/HETE/Bursts/GRB050123
This message may be cited.
GCN notice #2967
Derek B. Fox (Caltech) reports on behalf of the Caltech-NRAO-Carnegie GRB collaboration:
"We have observed the WXM localization region of GRB050123 (=H3666; Hurley et al., GCN 2966) with the robotic Palomar 60-inch telescope, in a series of R-band exposures beginning at 10:36:15 UT. A mosaic of our first exposure set reaches exposures of 30s to 120s over >95% of the final 15' x 24' error box, at a mean epoch of 11:02 UT. Comparison of this mosaic to the Digitized Sky Survey reveals no new sources to a limit of R>~19 mag.
Further analysis of these and later images is ongoing."
GCN notice #2968
W. Li, A. V. Filippenko, R. Chornock, and S. Jha (University of California, Berkeley) report:
"The Katzman Automatic Imaging Telescope (KAIT; see Li et al. 2003, PASP, 115, 844) at Lick Observatory robotically observed GRB 050123 (HETE Trigger #3666; Hurley et al., GCN 2966). Three batches of unfiltered images were taken, covering a 12.6' x 12.6' field centered on R.A. = 10h30m31s, DEC = -11d 52'17" (J2000) (from 10:23:38 UT to 10:54:37 UT), R.A. = 10h31m33s, DEC = -11d 34'14" (J2000) (from 10:58:31 UT to 11:58:53 UT), and R.A. = 10h31m26s, DEC = -11d 28'28" (J2000) (from 12:11:26 UT to 12:32:26 UT), respectively. We detected no new objects in our observations when compared to the DSS II images. The following 3-sigma limiting magnitudes are derived (calibrated with USNO-A2.0 red magnitudes) from selected images: R~17.5 mag for a 3 x 5 s grid image (6.6' x 6.6') started at 10:23:38 UT (44 s after the burst), R~19.0 for a 60 s image (6.6' x 6.6') started at 10:30:36 UT (462 s after the burst), and R~20.0 for a 2 x 2 mosaic 120 s image (12.6' x 12.6') centered at 10:51:57 UT (1743 s after the burst)."
GCN notice #2969
S.Maeno,E.Sonoda,Y.Matsuo,M.Yamauchi (University of Miyazaki)
"We have observed the field covering the error box of GRB 050123 (HETE trigger 3666;trigger time 10:22:53 UT) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 17:05:26 UT on Jan.23. Observed field of view is 43 arcmin centerd on
```
R.A.=10h 31m 58s
Dec=-11d 26' 00"
```
After co-adding a set of 5 images of 30 sec exposures, we have compared with the USNO A2.0 catalog. Preliminary analysis shows there is no new source brighter than 17.4 mag.
GCN notice #2970
M.Cwiok, K.Krupska, K.Kwiecinska, L.Mankiewicz, K.Nawrocki, B.Pilecki, L.W.Piotrowski, G.Pojmanski, M.Sokolowski, D.Szczygiel, G.Wrochna, on behalf of "Pi of the Sky / ASAS" collaboration http://grb.fuw.edu.pl
The GRB 050123 (GCN 2966) error box was observed by "Pi of the Sky" apparatus at Las Campanas Observatory at 8:35 UT, i.e. 1h 48min before the GRB. 3 exposures, 10s each, have been taken by 2 cameras. No new object has been found within the HETE error box. The limiting magnitude on 3 coadded frames is 12m (unfiltered).
GCN notice #2971
GRB 050123 : I-band follow-up observation
Z.Y. Lin, K.Y. Huang, W.H. Ip (NCU), Y. Urata, T. Tamagawa (RIKEN), Y. Qiu (BAO), Y.Q. Lou(THCA) on behalf of the East Asian collaboration report:
"We have observed the GRB 050123 error range reported by Hurley et al.(GCN 2966) using Lulin 1-m telescope at Taiwan. Our observations with I band started from 15.87 UT to 16.72 UT (~5.49 to 5.79 hours after the burst). These images cover 70 % error region of GRB 050123 (Hurley et al., GCN 2966). Comparing DSS-II image, no candidate was detected in our I band images. The average of limiting magnitude is about 19 (S/N=3, compared with USNO-B1 I magnitude)."
This message may be cited.

Back to JG's homepage

Jochen Greiner, last update: 24-Jan-2005 [Disclaimer]