Gamma-ray Burst 060428B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 08:56:58 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     207399,   Seg_Num: 0
GRB_RA:          235.350d {+15h 41m 24s} (J2000),
                 235.377d {+15h 41m 30s} (current),
                 235.141d {+15h 40m 34s} (1950)
GRB_DEC:         +62.010d {+62d 00' 36"} (J2000),
                 +61.990d {+61d 59' 24"} (current),
                 +62.169d {+62d 10' 07"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=4775 [image_cnts]
TRIGGER_DUR:     128.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        -1.16 SOD {00:00:-1.-15} UT
BKG_DUR:         0 [sec]
GRB_DATE:        13853 TJD;   118 DOY;   06/04/28
GRB_TIME:        32078.83 SOD {08:54:38.83} UT
GRB_PHI:           2.64 [deg]
GRB_THETA:        31.12 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    14.21 [sigma]
MERIT_PARAMS:     +1  +0  +0  +7  +1  +3  +0  +0 +21  +1 
SUN_POSTN:        35.57d {+02h 22m 18s}  +14.16d {+14d 09' 21"}
SUN_DIST:        102.27 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.89d {+02h 47m 34s}  +19.78d {+19d 46' 58"}
MOON_DIST:        97.52 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.15, 45.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      180.64, 74.52 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 261.05,20.10 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 08:58:45 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     207399,   Seg_Num: 0
GRB_RA:          235.3569d {+15h 41m 25.6s} (J2000),
                 235.3834d {+15h 41m 32.0s} (current),
                 235.1485d {+15h 40m 35.6s} (1950)
GRB_DEC:         +62.0238d {+62d 01' 25.6"} (J2000),
                 +62.0038d {+62d 00' 13.6"} (current),
                 +62.1825d {+62d 10' 56.9"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       107 [cnts]
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32282.63 SOD {08:58:02.63} UT,   203.8 [sec] since BAT Trigger Time
CENTROID_X:      248.23,  raw= 248  [pixels]
CENTROID_Y:      317.63,  raw= 318  [pixels]
ROLL:            19.63 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   44.39
GRB_POS_XRT_Z:   -125.09
IMAGE_URL:       sw00207399000msxps_rw.img
SUN_POSTN:        35.58d {+02h 22m 18s}  +14.16d {+14d 09' 22"}
SUN_DIST:        102.26 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.91d {+02h 47m 39s}  +19.79d {+19d 47' 21"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.17, 45.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      180.60, 74.53 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 08:58:43 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     207399,   Seg_Num: 0
GRB_RA:          235.3569d {+15h 41m 25.6s} (J2000),
                 235.3834d {+15h 41m 32.0s} (current),
                 235.1485d {+15h 40m 35.6s} (1950)
GRB_DEC:         +62.0238d {+62d 01' 25.6"} (J2000),
                 +62.0038d {+62d 00' 13.6"} (current),
                 +62.1825d {+62d 10' 56.9"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.33e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.34 [sigma]
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32282.63 SOD {08:58:02.63} UT,   203.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.64 237.21 261.27 243.46
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        35.58d {+02h 22m 18s}  +14.16d {+14d 09' 22"}
SUN_DIST:        102.26 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.91d {+02h 47m 39s}  +19.79d {+19d 47' 21"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.17, 45.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      180.60, 74.53 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 08:59:02 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     207399,   Seg_Num: 0
GRB_RA:          235.3569d {+15h 41m 25.6s} (J2000),
                 235.3834d {+15h 41m 32.0s} (current),
                 235.1485d {+15h 40m 35.6s} (1950)
GRB_DEC:         +62.0238d {+62d 01' 25.6"} (J2000),
                 +62.0038d {+62d 00' 13.6"} (current),
                 +62.1825d {+62d 10' 56.9"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       107 [cnts]
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32282.63 SOD {08:58:02.63} UT,   203.8 [sec] since BAT Trigger Time
CENTROID_X:      248.23,  raw= 248  [pixels]
CENTROID_Y:      317.63,  raw= 318  [pixels]
ROLL:            19.63 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   44.39
GRB_POS_XRT_Z:   -125.09
IMAGE_URL:       sw00207399000msxps_rw.img
SUN_POSTN:        35.58d {+02h 22m 18s}  +14.16d {+14d 09' 23"}
SUN_DIST:        102.26 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.91d {+02h 47m 39s}  +19.79d {+19d 47' 25"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.17, 45.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      180.60, 74.53 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 09:01:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.357d {+15h 41m 26s} (J2000)
POINT_DEC:       +61.987d {+61d 59' 12"} (J2000)
POINT_ROLL:      19.629d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32289.83 SOD {08:58:09.83} UT,   211.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.017
N_STARS:         56
X_OFFSET:        584 [pixels]
Y_OFFSET:        432 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1391 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207399000msufc0210.fits
SUN_POSTN:        35.58d {+02h 22m 19s}  +14.16d {+14d 09' 25"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.94d {+02h 47m 46s}  +19.80d {+19d 48' 02"}
MOON_DIST:        97.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.72, 74.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 09:02:46 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.357d {+15h 41m 26s} (J2000)
POINT_DEC:       +61.987d {+61d 59' 12"} (J2000)
ROLL:            19.629d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32289.83 SOD {08:58:09.83} UT,   211.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     167907490
X_OFFSET:        982 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00207399000msuni0210.fits
SUN_POSTN:        35.58d {+02h 22m 19s}  +14.16d {+14d 09' 25"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.95d {+02h 47m 48s}  +19.80d {+19d 48' 13"}
MOON_DIST:        97.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.72, 74.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 09:05:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.357d {+15h 41m 26s} (J2000)
POINT_DEC:       +61.987d {+61d 59' 12"} (J2000)
POINT_ROLL:      19.629d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32289.83 SOD {08:58:09.83} UT,   211.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.017
N_STARS:         56
X_OFFSET:        584 [pixels]
Y_OFFSET:        432 [pixels]
X_MAX:           1543 [pixels]
Y_MAX:           1391 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207399000msufc0210.fits
SUN_POSTN:        35.58d {+02h 22m 19s}  +14.16d {+14d 09' 27"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.97d {+02h 47m 54s}  +19.81d {+19d 48' 43"}
MOON_DIST:        97.52 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.72, 74.51 [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:     Fri 28 Apr 06 09:06:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.357d {+15h 41m 26s} (J2000)
POINT_DEC:       +61.987d {+61d 59' 12"} (J2000)
ROLL:            19.629d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32289.83 SOD {08:58:09.83} UT,   211.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     167907490
X_OFFSET:        982 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00207399000msuni0210.fits
SUN_POSTN:        35.58d {+02h 22m 19s}  +14.16d {+14d 09' 28"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       41.99d {+02h 47m 57s}  +19.82d {+19d 48' 59"}
MOON_DIST:        97.52 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.72, 74.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 09:11:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
POINT_ROLL:      19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32936.24 SOD {09:08:56.24} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.264
N_STARS:         78
X_OFFSET:        662 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1621 [pixels]
Y_MAX:           1331 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207399000msufc0857.fits
SUN_POSTN:        35.58d {+02h 22m 20s}  +14.16d {+14d 09' 32"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.03d {+02h 48m 08s}  +19.83d {+19d 49' 58"}
MOON_DIST:        97.51 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 09:13:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
POINT_ROLL:      19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32936.24 SOD {09:08:56.24} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.264
N_STARS:         78
X_OFFSET:        662 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1621 [pixels]
Y_MAX:           1331 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207399000msufc0857.fits
SUN_POSTN:        35.59d {+02h 22m 21s}  +14.16d {+14d 09' 34"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.05d {+02h 48m 12s}  +19.84d {+19d 50' 25"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [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:     Fri 28 Apr 06 09:13:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
ROLL:            19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32936.24 SOD {09:08:56.24} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     167908137
X_OFFSET:        982 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00207399000msuni0857.fits
SUN_POSTN:        35.59d {+02h 22m 21s}  +14.16d {+14d 09' 34"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.05d {+02h 48m 13s}  +19.84d {+19d 50' 28"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [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:     Fri 28 Apr 06 09:15:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
ROLL:            19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  32936.24 SOD {09:08:56.24} UT,   857.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     167908137
X_OFFSET:        982 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00207399000msuni0857.fits
SUN_POSTN:        35.59d {+02h 22m 21s}  +14.16d {+14d 09' 35"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.07d {+02h 48m 18s}  +19.85d {+19d 50' 54"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 09:15:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
POINT_ROLL:      19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  33041.96 SOD {09:10:41.96} UT,   963.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.185
N_STARS:         57
X_OFFSET:        662 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1621 [pixels]
Y_MAX:           1331 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207399000msufc0963.fits
SUN_POSTN:        35.59d {+02h 22m 21s}  +14.16d {+14d 09' 36"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.08d {+02h 48m 19s}  +19.85d {+19d 51' 00"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Apr 06 09:18:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
POINT_ROLL:      19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  33041.96 SOD {09:10:41.96} UT,   963.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.185
N_STARS:         57
X_OFFSET:        662 [pixels]
Y_OFFSET:        372 [pixels]
X_MAX:           1621 [pixels]
Y_MAX:           1331 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207399000msufc0963.fits
SUN_POSTN:        35.59d {+02h 22m 21s}  +14.16d {+14d 09' 38"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.10d {+02h 48m 24s}  +19.86d {+19d 51' 29"}
MOON_DIST:        97.49 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [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:     Fri 28 Apr 06 09:18:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
ROLL:            19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  33041.96 SOD {09:10:41.96} UT,   963.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     167908243
X_OFFSET:        982 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00207399000msuni0963.fits
SUN_POSTN:        35.59d {+02h 22m 21s}  +14.16d {+14d 09' 38"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.10d {+02h 48m 25s}  +19.86d {+19d 51' 31"}
MOON_DIST:        97.49 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [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:     Fri 28 Apr 06 09:20:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     207399,   Seg_Num: 0
POINT_RA:        235.351d {+15h 41m 24s} (J2000)
POINT_DEC:       +61.988d {+61d 59' 16"} (J2000)
ROLL:            19.623d
IMG_START_DATE:  13853 TJD;   118 DOY;   06/04/28
IMG_START_TIME:  33041.96 SOD {09:10:41.96} UT,   963.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     167908243
X_OFFSET:        982 [pixels]
Y_OFFSET:        692 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       852
BINNING_INDEX:   1
IM_URL:          sw00207399000msuni0963.fits
SUN_POSTN:        35.59d {+02h 22m 22s}  +14.16d {+14d 09' 39"}
SUN_DIST:        102.29 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:       42.12d {+02h 48m 29s}  +19.87d {+19d 51' 57"}
MOON_DIST:        97.49 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       96.12, 45.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      180.71, 74.51 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #5017
S. Campana (INAF-OAB), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), J. R. Cummings (NASA/ORAU), N. Gehrels (NASA/GSFC), C. B. Markwardt (GSFC/UMD), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-OAB) and D. E. Vanden Berk (PSU) report on behalf of the Swift Team:
At 08:54:38 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060428B (trigger=207399). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 235.350,+62.010 {15h 41m 24s,+62d 00' 36"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This is an image trigger (128 sec), so the lightcurve does not show any significant activity (as is typical).
The XRT began observing the field at 08:58:02 UT, 204 seconds after the BAT trigger. XRT found a bright, fading X-ray source located at RA(J2000) = 15h 41m 25.6s, Dec(J2000) = +62d 01' 25.6", with an estimated uncertainty of 5.0 arcseconds (90% confidence radius). This location is 51 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 2.3e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 212 seconds after the BAT trigger, and of 400 sec. with the V filter starting at 965 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The 3-sigma V band upper limit is about 19.1 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 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
GCN Circular #5019
P.A. Price (IfA, Hawaii), T. Minezaki (IoA, Tokyo), L.L. Cowie, Y. Kakazu (IfA, Hawaii) and Y. Yoshii (IoA, Tokyo) report:
We have observed the XRT localisation of GRB 060428B (GCN #5017) with the robotic MAGNUM telescope. Observations were made under clouds in R and I bands starting at 2006 Apr 28.38 UTC, with interruptions due to weather. Observations consisted of 10 x 65 sec exposures in R-band.
We identify a source in the combined image, which does not appear to be in the DSS 2 red plate. While a precise astrometric solution is not yet available, our estimate of the position is approximately 3 arcsec west of the USNO-B1 source 1520-0246226 (at 15:41:25.96 +62:01:30.160 J2000), or around
15:41:25.5 +62:01:30 J2000
The source is approximately R ~ 19.6 mag at the time of our observations (from comparison with the USNO-B1 catalogue), and also appears in subsequent I-band and R-band combined images.
An image of the field is available at http://www.ifa.hawaii.edu/~price/grb060428b.jpg
GCN Circular #5021
M.Abe (ISAS/JAXA), Y. Sarugaku, H.Mito (Tokyo Univ.), Y.L. Qiu, W.K. Zheng (NAOC), K.Y. Huang(NCU), Y. Urata (Saitama Univ.) on behalf of EAFON report:
"We have observed the GRB 060428B field (GCN #5017) using Kiso 1.05m telescope. The R and B band observations were started from 2.3 hours after the burst (after end of twilight). The limiting magnitude derived from USNOB1.0 is R=20.7 (SN=3). The candidate (GCN #5019) do not appear brighter than the limiting magnitude. This result indicates that the candidate is afterglow of GRB 060428B.
Further analysis is in progress."
This message may be cited.
GCN Circular #5023
E.Sonoda,S.Maeno,M.Yamauchi (University of Miyazaki)
We have observed the field covering the error circle of GRB060428B (GCN 5017) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 12:02:52 UT, ~3.14 hour after the Swift trigger time.
We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, there is no new source at the position reported by P.A.Price et al.(GCN 5019).
The upper limits are as follows:
```
--------------------------------------------------------------
Start(UT)	End(UT)	    Num. of frames	Limit (mag.)	
--------------------------------------------------------------
12:02:52	12:11:28	8		~12.8
12:11:52	12:41:28	24		~16.9
12:42:56	12:47:02	4		~17.9
---------------------------------------------------------------
```
GCN Circular #5027
W. Li, R. Chornock, N. Butler, J. Bloom, and A. V. Filippenko (University of California, Berkeley), on behalf of the KAIT GRB team, report:
The robotic 0.76-m Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory observed GRB 060428B, detected with Swift (Trigger 207399; Campana et al. GCN 5017). The automatic sequence started at 08:57:50, 192 s after the burst. In a 15 s unfiltered image, no afterglow candidate is detected to a limiting magnitude of 18.7 (from comparison with the USNO B1.0 catalog). Our real-time image processing software detected the optical afterglow candidate reported by Price et al. (GCN 5019) in a 60 s unfiltered image started at 642 s after the burst, with the following precise (+/- 0.3") position:
RA = 15:41:25.63 Dec = +62:01:30.3 (J2000.)
A table of photometry (3-sigma limits and detections) is reported below. The photometry of the afterglow candidate suggests a flat luminosity evolution from 10 to 35 minutes after the burst, but we caution that the photometry may suffer larger uncertainties than reported due to relatively poor detections and the contamination of a nearby source.
======================================================================
```
Start UT   t(GRB)   exposure(s)   Filter   3sigma-limit       detection 

08:57:50   192s    15.0          clear    18.7       
08:58:27   229s    15.0          V        16.9
08:58:57   259s    15.0          I        17.2
08:59:28   290s    20.0          clear    19.0
09:00:04   326s    45.0          V        17.7
09:01:04   386s    45.0          I        18.3
09:02:05   427s    45.0          clear    19.2
09:03:07   489s    60.0          V        17.9
09:04:23   565s    60.0          I        18.3
09:05:40   642s    60.0          clear                       19.58 +/- 0.13
09:10:51   953s    120.0         clear                       19.64 +/- 0.13
09:18:51   1433s   240.0         clear                       19.40 +/- 0.11
09:30:55   2157s   360.0         clear                       19.52 +/- 0.11
```
========================================================================
GCN Circular #5028
Y.Q. Lou, X.F. Wang (THCA), M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng (NAOC) K.Y. Huang (NCU), Y. Urata (Saitama Univ.) on behalf of EAFON report:
We have observed the field of GRB060428B (GCN 5017) with the Xinglong 0.8m telescope 3.54 hours after the burst, The candidate (GCN 5019) do not appear within our 7x600s combined I-band image. Upper limit is 19.1(SN=3) Mag .
This message may be cited.
GCN Circular #5029
T. Sakamoto (NASA/ORAU), L. Barbier (GSFC), S. Barthelmy (GSFC), S. Campana (INAF-OAB), J. Cummings (NASA/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), G. Sato (ISAS), J. Tueller (GSFC), M. Koss (UMD), M. Stamatikos (NASA/ORAU) on behalf of the Swift-BAT team:
Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060428B (trigger #207399) (Campana, et al., GCN 5017). The BAT ground-calculated position is RA,Dec = 235.378,+62.027 deg {15h 41m 30.8s,+62d 1' 35.8"} (J2000) +- 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 74%.
The mask-weighted lightcurve shows a broad peak starting at T-20 sec until ~T+44 sec. T90 (15-350 keV) is 58 +- 3 sec (estimated error including systematics).
The time-averaged spectrum from T-23.8 to T+41.9 is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.94 +- 1.30, and Epeak of 21.7 +- 14.0 keV (chi squared 68.81 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 7.2 +- 0.9 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T+20.78 sec in the 15-150 keV band is 0.6 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.58 +- 0.19 (chi squared 75.57 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
GCN Circular #5031
E. Troja (INAF-IASFPA), V. Mangano (INAF-IASFPA), P. Romano (INAF-OAB), D. N. Burrows (PSU) report on behalf of the Swift XRT Team:
We have analyzed the XRT data of the first four orbits of GRB060428B (Campana et al 2006, GCN 5017). The data set consists of 205 s exposure in Windowed Timing (WT) mode followed by 8.4 ks exposure in Photon Counting (PC) mode.
The refined position of the source is
```
     RA (2000) = 15h 41m 25.57s
     Dec (2000) = +62d 01' 28.94"
```
with an uncertainty of 3.8 arcsec (90% confinement). This position was evaluated from PC data of the orbits 2-4, that are not affected by pile-up. This position is 3.35 arcsec from the onboard detected position (Campana et al 2006, GCN 5017) and 1.4 arcsec from the optical afterglow candidate found by Price et al 2006 (GCN 5019). To evaluete this offset we used the KAIT coordinates from Li et al.(GCN 5027).
The 0.2-10 keV X-ray light curve shows an initial very fast decay with slope -4.4 +/- 0.07, a break at 689 +/- 28 s from the trigger and then a decay slope of -0.89 +/- 0.06.
The WT spectrum from the first orbit was fitted with an absorbed power law model and showed a photon index of 2.82 +/- 0.08 (90% confidence level). The WT spectrum covers the 212-418 s time interval. The spectrum shows evidence of an absorption column at the level of (6.7 +/- 0.7) x 10^20 cm^-2 in excess with respect to the Galactic value of 1.7 x 10^20 cm^-2. The 0.2-10 keV unabsorbed flux is 9.8 x 10^-10 ergs cm^-2 s^-1.
The PC spectrum of the orbits 2-4 (time interval 4.4-18.5 ks) is well fit by an absorbed powerlaw model with photon index 2.08 +/- 0.16. The 0.2-10 keV unabsorbed flux is 1.6^-12 ergs cm^-2 s^-1.
If decaying at the present rate the source will reach the flux level of 2.6^-13 erg cm^-2 s^-1 (corresponding to a count rate level of 5 x 10^-3 counts s^-1) after one day.
This Circular is an official product of the Swift XRT Team.
GCN Circular #5034
J. P. Halpern (Columbia U.) and N. Mirabal (U. Michigan) report:
"We observed the optical afterglow (Price et al. GCN 5019; Li et al. GCN 5027) of Swift GRB 060428B (Campana et al. GCN 5017) in the R band on the MDM 1.3m telescope during the period April 29.15-29.49 UT, or 18.6-26.8 hours after the burst. The fading noted by Abe et al. (GCN 5021) has continued. We estimate R~22.5 at 24 hours post-burst based on calibration with Landolt standard stars. We note that all of the objects within 25" of the transient appear to be galaxies, including one having R=19.4 that is only 3" to the east.
A combined image of 1 hour total exposure at 24 hours post-burst is available at
http://www.astro.columbia.edu/~jules/grb/060428b/mdm.jpg
This message may be cited."
GCN Circular #5035
M. De Pasquale (UCL-MSSL), S. Campana (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began taking data on the field of GRB060428B at 08:57:52 UT on 2006-04-28, 194 s after the BAT trigger (Campana et al., GCN 5017). At the position of the optical afterglow claimed by Price et al. (GCN 5019) and Li et al. (GCN 5027), inside the XRT error circle (Troja et al., GCN 5031), we find a source near the detection limits in the V band and in the White filter, not present in the USNO B1.0 catalogue. The source is present in the first ~1000 seconds of observations, with a significance of ~3 sigma. It is not detected later.
```
    Filter   T_range(s)   Exp(s)        Mag

     V        194-1233     356     19.5 +0.5 -0.3
     V       5630-16900   1081          >20.4

    White     211-960      227     19.7 +/- 0.3
    White    5247-18579   1135          >20.7
```
The upper limits quoted above are at the 3 sigma level. The source is not detected in any of the other filters. The fading behaviour may indicate that it is the GRB060428B optical afterglow, however we do caution that detections are marginal and the results suffer from a contamination by an extended source, the galaxy quoted by Helpern et al. in GCN 5034. An association with the GRB cannot be excluded.
No other afterglow candidate was detected at the refined XRT position in summed images from any of the filters down to the following three-sigma upper limits:
```
    Filter   T_range(s)   Exp(s)   3sigma U.L.

     V        194-16900   1441       20.5
     B        413-17812   1308       21.4
     U        390-16900   1357       21.1
     UW1      367-19996   1227       20.6
     UM2      443-12022   1358       20.6
     UW2      323-6894     383       20.2
    White     212-18579   1363       20.8
```
These upper limits are uncorrected for the estimated Galactic reddening of E_{B-V} = 0.01 mag (Schlegel et al. 1998).
GCN Circular #5036
V.Rumyantsev (CrAO), V.Biryukov (SAI, MSU), and A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the optical afterglow (Price et al. GCN5019; Li et al. GCN5027) of Swift GRB060428B (Campana et al. GCN 5017) in the R band with Shajn 2.6m telescope of CrAO between April 28 (UT) 18:43 -- 20:41, i.e. 9.8 -- 11.8 hrs after the burst onset. The afterglow is visible on a combined image of a total exposure 3240 sec in a tail of the nearby galaxy (Halpern et al. GCN5034) and precise photometry is underway. Based on USNO A2.0 we estimate limiting magnitude of the combined image as R=24.3.
Combined image can be found in http://grb.rssi.ru/GRB060428/grb060428_ZTSH_R.gif
The message may be cited.
GCN Circular #5037
Richard J. Cool (Arizona), Daniel J. Eisenstein (Arizona), David W. Hogg (NYU), Michael R. Blanton (NYU), David J. Schlegel (LBNL), J. Brinkmann (APO), Donald Q. Lamb (Chicago), Donald P. Schneider (PSU), and Daniel E. Vanden Berk (PSU) report:
The Sloan Digital Sky Survey (SDSS) imaged the field of burst GRB060428B prior to the burst. As these data should be useful as a pre-burst comparison and for calibrating photometry, we are supplying the images and photometry measurements for this GRB field to the community.
Data from the SDSS, including 5 FITS images, 3 JPGS, and 3 files of photometry and astrometry, are being placed at http://mizar.as.arizona.edu/~grb/public/GRB060428B
We supply FITS images in each of the 5 SDSS bands of a 8'x8' region centered on the GRB position (ra=235.357 (15:41:25.7), dec=62.0238 (62:01:25.7); GCN 5017), as well as 3 gri color-composite JPGs (with different stretches). The units in the FITS images are nanomaggies per pixel. A pixel is 0.396 arcsec on a side. A nanomaggie is a flux-density unit equal to 10^-9 of a magnitude 0 source or, to the extent that SDSS is an AB system, 3.631e-6 Jy. The FITS images have WCS astrometric information.
In the file GRB060428B_sdss.calstar.dat, we report photometry and astrometry of 303 bright stars (r<20.5) within 15' of the burst location. The magnitudes presented in this file are asinh magnitudes as are standard in the SDSS (Lupton 1999, AJ, 118, 1406). Beware that some of these stars are not well-detected in the u-band; use the errors and object flags to monitor data quality.
In the files GRB060428B_sdss.objects_flux.dat and GRB060428B_sdss.objects_magnitudes.dat, we report photometry of 501 objects detected within 6' of the GRB position. We have removed saturated objects and objects with model magnitudes fainter than 23.0 in the r-band. The fluxes listed in GRB060428B_sdss.objects_flux.dat are in nanomaggies while the magnitudes listed in GRB060428B_sdss.objects_magnitudes.dat are asinh magnitudes.
**Be aware that at least a portion of the photometry provided in this release has been flagged as non-photometric. As photometry for objects with this flag set may have non-optimal calibration, we do not recommend these objects be used for photometric calibration. Non-photometric imaging may still be valuable as a pre-burst comparison and for astrometric calibration.
All quantities reported are standard SDSS photometry, meaning that they are very close to AB zeropoints and magnitudes are quoted in asinh magnitudes. Photometric zeropoints are known to about 2% rms. None of the photometry is corrected for dust extinction. The Schlegel, Finkbeiner, and Davis (1998) predictions for this region are A_U=0.073 mag, A_g=0.054 mag, A_r = 0.039 mag, A_i=0.030 mag, and A_z=0.021 mag.
There are currently no objects within 6 arcminutes of the GRB position in the SDSS spectroscopic database.
SDSS astrometry is generally better than 0.1 arcsecond per coordinate. Users requiring high precision astrometry should take note that the SDSS astrometric system can differ from other systems such as those used in other notices; we have not checked the offsets in this region.
More detailed information pertaining to our SDSS GRB releases can be found in our initial data release paper (Cool et al. 2006, astro-ph/0601218). See the SDSS DR4 documentation for more details: http://www.sdss.org/dr4
These data have been reduced using a slightly different pipeline than that used for SDSS public data releases. We cannot guarantee that the values here will exactly match those in the data release in which these data are included. In particular, we expect the photometric calibrations to differ by of order 0.01 mag.
This note may be cited, but please also cite the SDSS data release paper, Adelman-McCarthy et al. (2006, ApJS, in press, astro-ph/0507711), when using the data or referring to the technical documentation.
GCN Circular #5075
D. Fugazza (INAF/OABr), D. Malesani (SISSA), G. Chincarini (Univ. Milano-Bicocca & INAF/OABr), S. Covino, P. Romano, G. Tagliaferri (INAF/OABr), M. Della Valle (INAF/OAA), N. Masetti (INAF/IASF Bo), G. Andreuzzi, N. Pinilla Alonso (INAF/TNG), report on behalf of a larger collaboration:
We observed the field of GRB 060428B (Campana et al., GCN 5017; Troja et al., GCN 5031), possibly an X-ray flash (Sakamoto et al., GCN 5029). We undertook spectroscopy of the object 3" close to the optical afterglow (Price et al., GCN 5019; Li et al., GCN 5027; Halpern & Mirabal, GCN 5034), considering it as a potential host galaxy. Low-resolution spectroscopy (~15 A FWHM) was obtained with TNG+DOLoRes, starting on 2005 May 3.89273, for a total exposure time of 1 hr.
Inspection of the spectrum reveals a smooth, very red continuum. No prominent features were detected either in emission or in absorption. We thus consider unlikely that this object is the host galaxy of GRB 060428B.
A plot of the spectrum can be found at the following URL: http://www.sissa.it/~malesani/GRB/060428B/spectrum.gif
This message can be cited.

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Jochen Greiner, last update: 05-May-2006 [Disclaimer]