Gamma-ray Burst 060403

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:12:34 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     203755,   Seg_Num: 0
GRB_RA:          282.306d {+18h 49m 13s} (J2000),
                 282.381d {+18h 49m 32s} (current),
                 281.705d {+18h 46m 49s} (1950)
GRB_DEC:          +8.330d {+08d 19' 47"} (J2000),
                  +8.337d {+08d 20' 14"} (current),
                  +8.272d {+08d 16' 18"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3847 [cnts]    Image_Peak=224 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       21358 [cnts]
BKG_TIME:        47518.88 SOD {13:11:58.88} UT
BKG_DUR:         8 [sec]
GRB_DATE:        13828 TJD;    93 DOY;   06/04/03
GRB_TIME:        47537.12 SOD {13:12:17.12} UT
GRB_PHI:          90.00 [deg]
GRB_THETA:         4.54 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     20.12 [sigma]
IMAGE_SIGNIF:    9.60 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +7  +0  +1  -1  +1 
SUN_POSTN:        12.56d {+00h 50m 14s}   +5.38d {+05d 23' 01"}
SUN_DIST:         89.39 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.78d {+05h 19m 07s}  +28.27d {+28d 15' 60"}
MOON_DIST:       137.38 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.11,  4.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 322.20,11.42 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:15:53 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     203755,   Seg_Num: 0
GRB_RA:          282.306d {+18h 49m 13s} (J2000),
                 282.381d {+18h 49m 32s} (current),
                 281.705d {+18h 46m 49s} (1950)
GRB_DEC:          +8.330d {+08d 19' 47"} (J2000),
                  +8.337d {+08d 20' 14"} (current),
                  +8.272d {+08d 16' 18"} (1950)
GRB_DATE:        13828 TJD;    93 DOY;   06/04/03
GRB_TIME:        47537.12 SOD {13:12:17.12} UT
TRIGGER_INDEX:   155
GRB_PHI:          90.00 [deg]
GRB_THETA:         4.54 [deg]
DELTA_TIME:      -63.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     20.12 [sigma]
IMAGE_SIGNIF:    9.60 [sigma]
LC_URL:          sw00203755000msb.lc
SUN_POSTN:        12.56d {+00h 50m 14s}   +5.38d {+05d 23' 04"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.81d {+05h 19m 15s}  +28.27d {+28d 16' 10"}
MOON_DIST:       137.39 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.11,  4.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 322.20,11.42 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:16:41 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.305d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 32"} (J2000)
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47759.59 SOD {13:15:59.59} UT,   222.5 [sec] since BAT Trigger Time
COUNTS:          12    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:17:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.305d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 31"} (J2000)
POINT_ROLL:      84.626d
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47599.32 SOD {13:13:19.32} UT,   62.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.946
N_STARS:         129
X_OFFSET:        467 [pixels]
Y_OFFSET:        526 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1485 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00203755000msufc0062.fits
SUN_POSTN:        12.56d {+00h 50m 14s}   +5.39d {+05d 23' 06"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.83d {+05h 19m 20s}  +28.27d {+28d 16' 16"}
MOON_DIST:       137.41 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.10,  4.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:19:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.305d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 31"} (J2000)
POINT_ROLL:      84.626d
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47599.32 SOD {13:13:19.32} UT,   62.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.946
N_STARS:         129
X_OFFSET:        467 [pixels]
Y_OFFSET:        526 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1485 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00203755000msufc0062.fits
SUN_POSTN:        12.56d {+00h 50m 15s}   +5.39d {+05d 23' 08"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.84d {+05h 19m 23s}  +28.27d {+28d 16' 20"}
MOON_DIST:       137.41 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.10,  4.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:19:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.305d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 31"} (J2000)
ROLL:            84.626d
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47599.32 SOD {13:13:19.32} UT,   62.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     165762800
X_OFFSET:        787 [pixels]
Y_OFFSET:        846 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       1006
BINNING_INDEX:   1
IM_URL:          sw00203755000msuni0062.fits
SUN_POSTN:        12.56d {+00h 50m 15s}   +5.39d {+05d 23' 08"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.85d {+05h 19m 23s}  +28.27d {+28d 16' 21"}
MOON_DIST:       137.41 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.10,  4.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:20:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.305d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 31"} (J2000)
ROLL:            84.626d
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47599.32 SOD {13:13:19.32} UT,   62.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     165762800
X_OFFSET:        787 [pixels]
Y_OFFSET:        846 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       1006
BINNING_INDEX:   1
IM_URL:          sw00203755000msuni0062.fits
SUN_POSTN:        12.56d {+00h 50m 15s}   +5.39d {+05d 23' 09"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.86d {+05h 19m 27s}  +28.27d {+28d 16' 25"}
MOON_DIST:       137.42 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.10,  4.28 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:23:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.306d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 30"} (J2000)
POINT_ROLL:      84.624d
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47704.48 SOD {13:15:04.48} UT,   167.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.361
N_STARS:         115
X_OFFSET:        467 [pixels]
Y_OFFSET:        526 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1485 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00203755000msufc0167.fits
SUN_POSTN:        12.56d {+00h 50m 15s}   +5.39d {+05d 23' 12"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.89d {+05h 19m 33s}  +28.28d {+28d 16' 33"}
MOON_DIST:       137.43 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.10,  4.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:24:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.306d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 30"} (J2000)
ROLL:            84.624d
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47704.48 SOD {13:15:04.48} UT,   167.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     165762905
X_OFFSET:        787 [pixels]
Y_OFFSET:        846 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       1006
BINNING_INDEX:   1
IM_URL:          sw00203755000msuni0167.fits
SUN_POSTN:        12.56d {+00h 50m 15s}   +5.39d {+05d 23' 13"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.90d {+05h 19m 37s}  +28.28d {+28d 16' 37"}
MOON_DIST:       137.44 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.10,  4.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 13:25:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     203755,   Seg_Num: 0
POINT_RA:        282.306d {+18h 49m 13s} (J2000)
POINT_DEC:        +8.325d {+08d 19' 30"} (J2000)
ROLL:            84.624d
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47704.48 SOD {13:15:04.48} UT,   167.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     165762905
X_OFFSET:        787 [pixels]
Y_OFFSET:        846 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       947
Y_GRB_POS:       1006
BINNING_INDEX:   1
IM_URL:          sw00203755000msuni0167.fits
SUN_POSTN:        12.56d {+00h 50m 16s}   +5.39d {+05d 23' 14"}
SUN_DIST:         89.40 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       79.91d {+05h 19m 38s}  +28.28d {+28d 16' 39"}
MOON_DIST:       137.44 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       40.10,  4.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      284.27, 31.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #4945
P. T. Boyd (NASA/GSFC), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), J. R. Cummings (NASA/ORAU), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (GSFC/USRA), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), V. La Parola (INAF-IASFPA), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-OAB) and T. Sakamoto (NASA/ORAU) report on behalf of the Swift Team:
At 13:12:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060403 (trigger=203755). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 282.306, +8.330 {18h 49m 13s, +08d 19' 47"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single FRED-like peak structure with a duration of about 25 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began taking data at 13:15:59 UT, 222 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image. However downlinked image data show the presence of a uncatalogued point source at the following position:
```
RA(J2000): 18:49:21.2 
Dec(J2000): +08:19:39.3  
```
with an error radius of 8 arcseconds (90% containment). This position lies 116 arcseconds from the BAT position.
UVOT took a finding chart exposure of 100 seconds with the White filter starting 63 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The XRT position is not covered by the 2.7'x2.7'sub-image. The typical 3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.1 mag. No correction has been made for the large, but uncertain expected extinction. We note that this is a crowded field.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 15:27:17 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     203755,   Seg_Num: 0
GRB_RA:          282.3383d {+18h 49m 21.1s} (J2000),
                 282.4134d {+18h 49m 39.2s} (current),
                 281.7375d {+18h 46m 56.9s} (1950)
GRB_DEC:          +8.3276d {+08d 19' 39.3"} (J2000),
                  +8.3351d {+08d 20' 06.2"} (current),
                  +8.2695d {+08d 16' 10.3"} (1950)
GRB_ERROR:       7.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.40e-11 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47759.58 SOD {13:15:59.58} UT,   222.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        12.64d {+00h 50m 34s}   +5.42d {+05d 25' 10"}
SUN_DIST:         89.44 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       81.15d {+05h 24m 36s}  +28.37d {+28d 22' 26"}
MOON_DIST:       137.94 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       40.12,  4.25 [deg] galactic lon,lat of the burst
ECL_COORDS:      284.30, 31.16 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        THIS IS A TEST

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 03 Apr 06 15:31:30 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     203755,   Seg_Num: 0
GRB_RA:          282.3383d {+18h 49m 21.1s} (J2000),
                 282.4134d {+18h 49m 39.2s} (current),
                 281.7375d {+18h 46m 56.9s} (1950)
GRB_DEC:          +8.3276d {+08d 19' 39.3"} (J2000),
                  +8.3351d {+08d 20' 06.2"} (current),
                  +8.2695d {+08d 16' 10.3"} (1950)
GRB_ERROR:       7.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.40e-11 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  13828 TJD;    93 DOY;   06/04/03
IMG_START_TIME:  47759.58 SOD {13:15:59.58} UT,   222.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        12.64d {+00h 50m 35s}   +5.42d {+05d 25' 14"}
SUN_DIST:         89.44 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       81.19d {+05h 24m 46s}  +28.38d {+28d 22' 38"}
MOON_DIST:       137.96 [deg]
MOON_ILLUM:      32 [%]
GAL_COORDS:       40.12,  4.25 [deg] galactic lon,lat of the burst
ECL_COORDS:      284.30, 31.16 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:          
COMMENTS:        THIS IS A REAL XRT POSITION MESSAGE.  
COMMENTS:        The previous notice (a few minutes ago) erroneously was distributed  
COMMENTS:        with a comment saying it was a test.  This was due to a bug in the code  
COMMENTS:        for this new manual-submission procedure.  
COMMENTS:        This is a REAL XRT Position (calculated on the ground).  
COMMENTS:        GCN apologizes for the confusion.

GCN Circular #4947
V. Mangano (INAF-IASFPA), J. Kennea (PSU), V. La Parola, T. Mineo, G. Cusumano (INAF-IASFPA), D.N. Burrows (PSU), P. Boyd (NASA/GSFC) on behalf of the Swift XRT team
We analysed 840 s exposure in Photon Counting mode from the first orbit of the Swift observation of GRB060403 (Boyd et al. 2006, GCN 4945). The refined coordinates of the X-ray source are:
```
    RA(J2000)  =   18 49 21.8  
    Dec(J2000) =  +08 19 45.3
```
with an estimated uncertainty of 5.5 arcseconds radius (90% containment). This position is 11 arcseconds from the preliminary position given in GCN 4945. The X-ray light curve shows a standard afterglow decay. Further analysis is on-going.
This circular is an official product of the Swift XRT team.
GCN Circular #4948
J. Tueller (GSFC), L. Barbier (GSFC), S.D. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), J. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS) on behalf of the Swift-BAT team:
Using the data set from T-119 to T+183 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060403 (trigger #203755) (Boyd, et al., GCN 4945). The BAT ground-calculated position is RA,Dec = 282.336, 8.328 deg {18h 49m 20.7s, 8d 19' 39.8"} (J2000) +- 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a single FRED-like peak starting at T-8 sec and extending out to about T+32 sec. T90 (15-350 keV) is 30 +- 3 sec (estimated error including systematics). The spectral lags place this burst in the long-burst class (Norris et al. 2005, ApJ, 627, 324): 1.23 +- 0.55 s (15-25 keV vs. 50-100 keV) and 0.80 +- 0.24 s (25-50 keV vs. 50-100 keV).
The time-averaged spectrum from T-6.2 to T+32.1 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.08 +- 0.09. The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-1.22 sec in the 15-150 keV band is 1.0 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #4951
T. S. Poole (UCL-MSSL), and P. T. Boyd (NASA/GSFC) on behalf of the Swift/UVOT team.
The Swift/UVOT began observing the field of GRB060403 (BAT Trigger=203755, P. T. Boyd, et. al, GCN 4945) at 13:13:00 UT, 43s after the BAT trigger (which includes the 10s V filter settling exposure). No new source is detected at the XRT position (V. Mangano, GCN 4947) in coadded images with any of the filters. The following 5-sigma magnitude upper limits are not corrected for Galactic extinction; E(B-V) = 1.270.
```
Filter   T_range(s)  T_exp(s)  5sigma(mag)

V        43-10090    1220.0    19.25
B        4011-16788  1299.0    20.41
U	 3807-15876  1299.0    20.16
UVW1     3602-11845  1242.6    20.18
UVM2     3397-10994  1299.4    20.59
UVW2     4421-6052   399.6     19.99
WHITE	 63-17630    1329.8    20.37
```
Where T_range is time post-trigger, and T_exp is the exposure time of the observation. A 6 arcsec radius was used for all filters.
This message may be cited.
GCN Circular #4952
T. Mineo, V. Mangano, V. La Parola, G. Cusumano (INAF-IASFPA), J. Kennea (PSU), P.T. Boyd (NASA/GSFC), D.N. Burrows (PSU) report on behalf of the Swift XRT team:
We analyzed the Swift XRT data of GRB 060403 (Boyd et al. GCN 4945). The observation started 52 s after the BAT trigger in Windowed Timing (WT) mode because before slewing to the GRB position, XRT was observing SGR1900+14 in manual state. The instrument then switched to auto state, taking the initial image frame for on board centroiding 222 s after the trigger, as reported in GCN 4945. The data we report on consisted of 5.5 ks exposure in WT mode and 15 ks exposure in Photon Counting (PC) mode.
The 0.2-10 keV light curve shows a clear power law decay with slope -1.49+/-0.04.
The average WT spectrum accumulated during the first orbit (from 52 s to 300 s after the trigger) is well fitted by a power law with photon index 1.61+/-0.22, absorbed at lower energies by a column of (8.1+/-2.1) x 10^21 cm^-2, higher than the galactic value (4.9 x 10^21 cm^-2). The 0.2-10 keV unabsorbed flux is 1.61 x 10^-11 ergs cm^-2 s^-1. If the burst continues decaying at the current rate we estimate an XRT count rate of 1 x 10^-4 counts/s at T+48hr, which corresponds to an unabsorbed 0.2-10 keV flux of 1x 10^-14 ergs cm^-2 s^-1.
This circular is an official product of the Swift XRT team.
GCN Circular #4953
F. Terra, (Second University of Roma "Tor Vergata"), C. Bartolini, G. Greco, A. Guarnieri, A. Piccioni (Bologna University), D. Nanni (INAF/OAR and Second University of Roma "Tor Vergata"), S. Galleti, R. Gualandi (INAF Bologna) and G. Pizzichini (INAF/IASF Bologna) report:
Using the 152 cm Loiano telescope equipped with the BFOSC camera system, we obtained in poor sky conditions (seeing = 2.7 arcsecs) two Rc-band images (2 x 900 sec) of the field of the GRB060403 (Boyd et al., GCN 4945, Mangano et al., GCN 4947) starting at April 4.0778 and 4.0898 respectively. A preliminary comparison with the DSS-2 does not reveal any new source brighter than the DSS-2 limit within 1' from the XRT location. Our co-added image reaches a detection limit slightly deeper than Rc=19. The Rc co-added image has been posted in our public directory from where it can be retrieved by sftp using: hostname: ermione.bo.astro.it username: publicGRB password: GRB_bo.
GCN Circular #4954
K. Yanagisawa (OAO/NAO) and N. Kawai (Tokyo Tech) report on behalf of the Mitsume Collaboration:
"The field of GRB060403 (Boyd et al. GCN 4945, Mangano et al. GCN 4947) was observed with the 3-color MITSuME 50cm Telescope at Okayama, Japan starting at 16:59 UT until 16:22 UT (mid-epoch 16:10 UT, t_burst+3 hr) in g', Rc, and Ic bands simultaneously.
With the total effective exposure of 18 min (60s x 18 frames), we did not detect a source brighter than g'=18.3, Rc=18.3, and Ic=17.9. (3 sigma) at the position of the XRT error circle. We placed the images at http://bragi.oao.nao.ac.jp/support/telescope/grb50/images/GRB060403.png
GCN Circular #4955
Y.Q. Lou, X.F. Wang (THCA), W.K. Zheng, Y.L. Qiu(NAOC), I.C. Yen (NTNU), C.S. Lin, H.C. Lin, K.Y. Huang (NCU), Y. Urata (Saitama U/RIKEN) on behalf of EAFON report
"We have observed GRB 060403 X-ray afterglow position (Boyd et al. GCN 4945, Mangano et al. GCN 4947) using Xinglong (China) 0.8m and Lulin (Taiwan) 1.0m telescopes on April 3 and 5. In I-band images taken at Lulin, we found two sources at the X-ray error region which do not appear in DSSII images. Since our I-band images are deeper than DSSII, we have monitored the sources. These sources do not show any significant variabilities in our observational period. Thus we conclude that these two sources do not related with GRB afterglow.
The limiting magnitude are summarize below.
```
 -------------------------------------------------------
 Date    Delay (h) Site     Filter  Exp.(s)   Limit mag
 -------------------------------------------------------
 Apr. 3   6.07     Xinglong R       600s x 12 20.4
 Apr. 3   5.87     Lulin    I       300s x  5 21.0
 Apr. 5  55.63     Lulin    I       300s x  2 19.6
 -------------------------------------------------------
```
This message may be cited."
GCN Circular #4956
D. Sharapov (MAO, and NOT, La Palma), A. Pozanenko (IKI), E. Klunko (ISTP), M. Ibrahimov (MAO), and V. Rumyantsev (CrAO) on behalf of larger GRB follow up collaboration report:
We observed the error-box of GRB060403 (Boyd et al. GCN 4945) with 1.5m telescope of Sayan Observatory (Mondy) in R and V-bands on Apr.3 between (UT) 19:44 and 21:10 under poor weather conditions and with 1.5m telescope of Maidanak Astronomical Observatory on Apr. 03 (UT) 22:36 - 22:59 and on Apr. 05 in R-band. Several images were obtained in each epochs. Telescope of Sayan Observatory equipped with SC3 CCD camera 1040x1160, 16mkm, FOV = 2'x2'.
Observations of Maidanak observatory are deeper than DSS2 and within refined XRT error box (Mangano et al. GCN 4947) few objects were found which are not presented in DSS2 R. All found objects are presented in both epochs and most probably are not related with GRB060403.
The limiting magnitudes of the observations are based on USNO A2.0:
```
Mid. time,   Filter,  Limit,  Seeing
(UT)
Apr.3.819     R      17.5    ~2.5"
Apr.3.876     V      18.8    ~2.0"
Apr.3.942     R      21.2    ~1.1"
Apr.5.994     R      20.5    ~1.4"
```
Results are preliminary; the images can be found in http://grb.rssi.ru/GRB060403/

Back to JG's homepage

Jochen Greiner, last update: 11-Apr-2006 [Disclaimer]