Gamma-ray Burst 060427

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 11:44:29 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     207281,   Seg_Num: 0
GRB_RA:          124.303d {+08h 17m 13s} (J2000),
                 124.440d {+08h 17m 46s} (current),
                 123.214d {+08h 12m 51s} (1950)
GRB_DEC:         +62.617d {+62d 37' 02"} (J2000),
                 +62.597d {+62d 35' 51"} (current),
                 +62.772d {+62d 46' 19"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1801 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        -1.15 SOD {00:00:-1.-14} UT
BKG_DUR:         0 [sec]
GRB_DATE:        13852 TJD;   117 DOY;   06/04/27
GRB_TIME:        42190.84 SOD {11:43:10.84} UT
GRB_PHI:         -122.35 [deg]
GRB_THETA:        24.48 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    9.47 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +0  +0  +0 -21  +1 
SUN_POSTN:        34.74d {+02h 18m 57s}  +13.88d {+13d 52' 35"}
SUN_DIST:         77.57 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.62d {+01h 58m 29s}  +14.82d {+14d 49' 25"}
MOON_DIST:        79.06 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      110.27, 41.57 [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 = 147.49,8.69 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 11:46:01 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     207281,   Seg_Num: 0
GRB_RA:          124.2691d {+08h 17m 04.5s} (J2000),
                 124.4063d {+08h 17m 37.5s} (current),
                 123.1790d {+08h 12m 42.9s} (1950)
GRB_DEC:         +62.6715d {+62d 40' 17.4"} (J2000),
                 +62.6517d {+62d 39' 05.9"} (current),
                 +62.8261d {+62d 49' 33.8"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       46 [cnts]
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  42320.90 SOD {11:45:20.90} UT,   130.1 [sec] since BAT Trigger Time
CENTROID_X:      267.50,  raw= 268  [pixels]
CENTROID_Y:      222.10,  raw= 222  [pixels]
ROLL:            276.11 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -180.78
GRB_POS_XRT_Z:   -79.67
IMAGE_URL:       sw00207281000msxps_rw.img
SUN_POSTN:        34.74d {+02h 18m 57s}  +13.88d {+13d 52' 36"}
SUN_DIST:         77.55 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.63d {+01h 58m 32s}  +14.83d {+14d 49' 48"}
MOON_DIST:        79.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.83, 33.66 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.23, 41.62 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 11:46:00 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     207281,   Seg_Num: 0
GRB_RA:          124.2691d {+08h 17m 04.5s} (J2000),
                 124.4063d {+08h 17m 37.5s} (current),
                 123.1790d {+08h 12m 42.9s} (1950)
GRB_DEC:         +62.6715d {+62d 40' 17.4"} (J2000),
                 +62.6517d {+62d 39' 05.9"} (current),
                 +62.8261d {+62d 49' 33.8"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.61e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.78 [sigma]
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  42320.90 SOD {11:45:20.90} UT,   130.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.62 237.20 261.17 243.34
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        34.74d {+02h 18m 57s}  +13.88d {+13d 52' 36"}
SUN_DIST:         77.55 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.63d {+01h 58m 32s}  +14.83d {+14d 49' 48"}
MOON_DIST:        79.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.83, 33.66 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.23, 41.62 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 11:46:20 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     207281,   Seg_Num: 0
GRB_RA:          124.2691d {+08h 17m 04.5s} (J2000),
                 124.4063d {+08h 17m 37.5s} (current),
                 123.1790d {+08h 12m 42.9s} (1950)
GRB_DEC:         +62.6715d {+62d 40' 17.4"} (J2000),
                 +62.6517d {+62d 39' 05.9"} (current),
                 +62.8261d {+62d 49' 33.8"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       46 [cnts]
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  42320.90 SOD {11:45:20.90} UT,   130.1 [sec] since BAT Trigger Time
CENTROID_X:      267.50,  raw= 268  [pixels]
CENTROID_Y:      222.10,  raw= 222  [pixels]
ROLL:            276.11 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -180.78
GRB_POS_XRT_Z:   -79.67
IMAGE_URL:       sw00207281000msxps_rw.img
SUN_POSTN:        34.74d {+02h 18m 57s}  +13.88d {+13d 52' 36"}
SUN_DIST:         77.55 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.64d {+01h 58m 33s}  +14.83d {+14d 49' 53"}
MOON_DIST:        79.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.83, 33.66 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.23, 41.62 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 11:48:16 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     207281,   Seg_Num: 0
GRB_RA:          124.303d {+08h 17m 13s} (J2000),
                 124.440d {+08h 17m 46s} (current),
                 123.214d {+08h 12m 51s} (1950)
GRB_DEC:         +62.617d {+62d 37' 02"} (J2000),
                 +62.597d {+62d 35' 51"} (current),
                 +62.772d {+62d 46' 19"} (1950)
GRB_DATE:        13852 TJD;   117 DOY;   06/04/27
GRB_TIME:        42190.84 SOD {11:43:10.84} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -122.35 [deg]
GRB_THETA:        24.48 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    9.47 [sigma]
LC_URL:          sw00207281000msb.lc
SUN_POSTN:        34.74d {+02h 18m 58s}  +13.88d {+13d 52' 38"}
SUN_DIST:         77.57 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.66d {+01h 58m 37s}  +14.84d {+14d 50' 22"}
MOON_DIST:        79.03 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      110.27, 41.57 [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 an image 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 = 147.49,8.69 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 11:54:33 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.305d {+08h 17m 13s} (J2000)
POINT_DEC:       +62.619d {+62d 37' 09"} (J2000)
POINT_ROLL:      276.113d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  42322.13 SOD {11:45:22.13} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.486
N_STARS:         50
X_OFFSET:        798 [pixels]
Y_OFFSET:        784 [pixels]
X_MAX:           1757 [pixels]
Y_MAX:           1743 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00207281000msufc0131.fits
SUN_POSTN:        34.74d {+02h 18m 59s}  +13.88d {+13d 52' 43"}
SUN_DIST:         77.57 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.71d {+01h 58m 52s}  +14.87d {+14d 51' 57"}
MOON_DIST:        78.98 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 11:56:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.305d {+08h 17m 13s} (J2000)
POINT_DEC:       +62.619d {+62d 37' 09"} (J2000)
POINT_ROLL:      276.113d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  42322.13 SOD {11:45:22.13} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.486
N_STARS:         50
X_OFFSET:        798 [pixels]
Y_OFFSET:        784 [pixels]
X_MAX:           1757 [pixels]
Y_MAX:           1743 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00207281000msufc0131.fits
SUN_POSTN:        34.75d {+02h 18m 59s}  +13.88d {+13d 52' 45"}
SUN_DIST:         77.57 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.74d {+01h 58m 57s}  +14.88d {+14d 52' 31"}
MOON_DIST:        78.96 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [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:     Thu 27 Apr 06 11:56:56 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.305d {+08h 17m 13s} (J2000)
POINT_DEC:       +62.619d {+62d 37' 09"} (J2000)
ROLL:            276.113d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  42322.13 SOD {11:45:22.13} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     167831123
X_OFFSET:        1118 [pixels]
Y_OFFSET:        1104 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1264
BINNING_INDEX:   1
IM_URL:          sw00207281000msuni0131.fits
SUN_POSTN:        34.75d {+02h 18m 59s}  +13.88d {+13d 52' 45"}
SUN_DIST:         77.57 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.74d {+01h 58m 57s}  +14.88d {+14d 52' 34"}
MOON_DIST:        78.96 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [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:     Thu 27 Apr 06 11:58:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.305d {+08h 17m 13s} (J2000)
POINT_DEC:       +62.619d {+62d 37' 09"} (J2000)
ROLL:            276.113d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  42322.13 SOD {11:45:22.13} UT,   131.3 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     167831123
X_OFFSET:        1118 [pixels]
Y_OFFSET:        1104 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1264
BINNING_INDEX:   1
IM_URL:          sw00207281000msuni0131.fits
SUN_POSTN:        34.75d {+02h 18m 59s}  +13.88d {+13d 52' 46"}
SUN_DIST:         77.56 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.75d {+01h 59m 00s}  +14.88d {+14d 52' 57"}
MOON_DIST:        78.95 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [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:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 12:02:35 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.309d {+08h 17m 14s} (J2000)
POINT_DEC:       +62.620d {+62d 37' 11"} (J2000)
POINT_ROLL:      276.118d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  43048.66 SOD {11:57:28.66} UT,   857.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.091
N_STARS:         43
X_OFFSET:        798 [pixels]
Y_OFFSET:        784 [pixels]
X_MAX:           1757 [pixels]
Y_MAX:           1743 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207281000msufc0857.fits
SUN_POSTN:        34.75d {+02h 18m 60s}  +13.88d {+13d 52' 49"}
SUN_DIST:         77.56 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.79d {+01h 59m 10s}  +14.90d {+14d 53' 59"}
MOON_DIST:        78.92 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Apr 06 12:04:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.309d {+08h 17m 14s} (J2000)
POINT_DEC:       +62.620d {+62d 37' 11"} (J2000)
POINT_ROLL:      276.118d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  43048.66 SOD {11:57:28.66} UT,   857.8 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.091
N_STARS:         43
X_OFFSET:        798 [pixels]
Y_OFFSET:        784 [pixels]
X_MAX:           1757 [pixels]
Y_MAX:           1743 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00207281000msufc0857.fits
SUN_POSTN:        34.75d {+02h 19m 00s}  +13.88d {+13d 52' 51"}
SUN_DIST:         77.56 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.81d {+01h 59m 15s}  +14.91d {+14d 54' 30"}
MOON_DIST:        78.90 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [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:     Thu 27 Apr 06 12:04:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.309d {+08h 17m 14s} (J2000)
POINT_DEC:       +62.620d {+62d 37' 11"} (J2000)
ROLL:            276.118d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  43048.66 SOD {11:57:28.66} UT,   857.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     167831849
X_OFFSET:        1118 [pixels]
Y_OFFSET:        1104 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1264
BINNING_INDEX:   1
IM_URL:          sw00207281000msuni0857.fits
SUN_POSTN:        34.75d {+02h 19m 00s}  +13.88d {+13d 52' 51"}
SUN_DIST:         77.56 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.81d {+01h 59m 15s}  +14.91d {+14d 54' 34"}
MOON_DIST:        78.90 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [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:     Thu 27 Apr 06 12:06:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     207281,   Seg_Num: 0
POINT_RA:        124.309d {+08h 17m 14s} (J2000)
POINT_DEC:       +62.620d {+62d 37' 11"} (J2000)
ROLL:            276.118d
IMG_START_DATE:  13852 TJD;   117 DOY;   06/04/27
IMG_START_TIME:  43048.66 SOD {11:57:28.66} UT,   857.8 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     167831849
X_OFFSET:        1118 [pixels]
Y_OFFSET:        1104 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1278
Y_GRB_POS:       1264
BINNING_INDEX:   1
IM_URL:          sw00207281000msuni0857.fits
SUN_POSTN:        34.75d {+02h 19m 00s}  +13.88d {+13d 52' 53"}
SUN_DIST:         77.56 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:       29.83d {+01h 59m 19s}  +14.92d {+14d 54' 60"}
MOON_DIST:        78.89 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      153.89, 33.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.27, 41.57 [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 #5006
V. Mangano (INAF-IASFPA), S. D. Barthelmy (GSFC), S. Campana (INAF-OAB), J. R. Cummings (NASA/ORAU), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), F. E. Marshall (NASA/GSFC), 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 11:43:10 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060427 (trigger=207281). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 124.303, +62.617 {08h 17m 13s, +62d 37' 02"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This was an image trigger so the TDRSS lightcurve does not show any significant activity.
The XRT began observing the field at 11:45:20 UT, 130 seconds after the BAT trigger. XRT found a fading, uncatalogued X-ray source located at RA(J2000) = 08h 17m 04.5s, Dec(J2000) = +62d 40' 17.4", with an estimated uncertainty of 5.4 arcseconds (90% confidence radius). This location is 204 arcseconds from the BAT on-board position, outside the BAT error circle. The initial flux in the 2.5s image was 9.6e-10 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 400 seconds with the V filter starting 133 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 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 has an upper limit of 19.2 mag. No correction has been made for the expected extinction of about 0.2 magnitudes.
GCN Circular #5007
S.Maeno, E.Sonoda, M.Yamauchi (University of Miyazaki)
"We have observed the field covering the error circle of GRB060427 (GCN 5006) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 11:44:48 UT on Apr.27 (98sec after the Swift trigger). After co-adding a set of 13 images (11:44:48 - 12:00:21 UT) of 30 sec exposures, we have compared with the USNO A2.0 catalog. Preliminary analysis shows there is no new source brighter than 15.1 mag."
GCN Circular #5010
V. Mangano (INAF-IASFPA), G. Tagliaferri (INAF-OAB), D. N. Burrows (PSU) report on behalf of the Swift XRT Team:
We have analyzed the first orbit data of GRB060417 (Mangano et al 2006, GCN 5006). The XRT data set consists of 88 s exposure in Windowed Timing (WT) mode followed by 843 s exposure in Photon Counting (PC) mode.
The refined position of the source is
```
    RA  (2000) =  08h 17m  04.4s  
    Dec (2000) = +62d 40'  18.3"
```
with an uncertainty of 3.4 arcsec (90% confinement). This position is only 1 arcsec from the onboard detected position (Mangano et al 2006, GCN 5006).
The 0.2-10 keV X-ray light curve shows an initial very fast decay with slope -4.3 +/- 0.2, a break at 247 +/- 12 s from the trigger and a final decay slope of -1.7 +/- 0.13.
The WT and PC spectra were fitted separately with an absorbed power law model and showed photon indices of 2.9 +/- 0.1 and 2.37 +/- 0.14, respectively (90% confidence level). The WT spectrum, covering the time interval 138-227 s, accounts for the pre-break phase of the light curve. Both spectra show evidence of an absorption column at the level of (1.7 +/- 0.2) x 10^21 cm^-2 in excess with respect to the Galactic value of 4.3 x 10^20 cm^-2. The 0.2-10 keV unabsorbed fluxes of the two spectra are 1.3 x 10^-9 and 6.6 x 10^-11 erg cm^-2 s^-1, respectively.
If decaying at the present rate the source will reach the flux level of 10^-14 erg cm^-2 s^-1 (corresponding to a count rate level of 1.5 x 10^-4 counts s^-1) after one day.
This Circular is an official product of the Swift XRT Team.
GCN Circular #5011
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), V. Mangano (INAF-IASFPA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC) 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 060427 (trigger #207281) (Mangano, et al., GCN 5006). The BAT ground-calculated position is RA,Dec = 124.175,+62.654 deg {8h 16m 42.0s,+62d 39' 13.4"} (J2000) +- 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 71%.
The mask-weighted lightcurve shows a broad peak starting at ~T-20 sec and lasting to ~T+80 sec. T90 (15-350 keV) is 64 +- 5 sec (estimated error including systematics).
The time-averaged spectrum from T-10.0 to T+60.0 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.29. The fluence in the 15-150 keV band is 5.0 +- 0.9 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+5.00 sec in the 15-150 keV band is 0.3 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5012
M. De Pasquale (UCL-MSSL), V. Mangano (IASF Palermo) report on behalf of the Swift/UVOT team:
The Swift/UVOT began taking data on the field of GRB060427 at 11:45:13 UT on 2006-04-27, 122 s after the BAT trigger (Mangano et al., GCN 5006), with the settling exposure. No afterglow candidate was detected at the refined XRT position (Falcone et al., GCN 5009) in summed images from any of the filters down to the following three-sigma upper limits.
```
  Filter  T_range(s)  Exp(s) 3sig_UL

  V       122-6920   1668   20.4
  B       610-6635    416   20.7
  U       585-6430    436   20.3
  UVW1    562-6226    457   20.0
  UVM2    562-6021    456   20.0
  UVW2    626-6840    436   20.5
```
These upper limits are uncorrected for the estimated Galactic reddening of E_{B-V} = 0.051 mag (Schlegel et al. 1998).
GCN Circular #5013
A. R. L=F3pez-S=E1nchez, J. Garc=EDa-Rojas (IAC La Laguna), M. Jel=EDnek and A. J. Castro-Tirado (IAA-CSIC Granada), report on behalf of a larger collaboration:
"Following the detection by SWIFT of GRB 060427 (V. Mangano et al. GCNC 5006), we have obtained R & I-band images at the 2.5m Nordic Optical Telescope (+ ALFOSC), starting on Apr 27.876 UT (i.e. 9.25 hr after the onset of the event). At the position of the X-ray afterglow detected by SWIFT/XRT (V. Mangano et al. GCNC 5010), no optical source is detected in the 600s R-band image, down to a limiting magnitude of R =3D 23.5."
This message can be quoted.
GCN Circular #5015
M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng and W.K. Zheng, report on behalf of EAFON:
We have observed the field of GRB060427 (GCN 5006) with the Xinglong 0.8m telescope 4.788 hours after the burst, thers is no new source brighter than 18.7(3-sigma) Mag within 4x600s combined R-band image.
This message may be cited.
GCN Circular #5016
P.A. Price (IfA, Hawaii), D.B. Fox (Penn State), S.B. Cenko (Caltech), E. Berger (OCIW), B.P. Schmidt (RSAA, ANU) and L.L. Cowie (IfA, Hawaii) report on behalf of a larger collaboration:
We have observed the XRT localisation of the afterglow of GRB 060427 (GCN #5010) with the Gemini North telescope + NIRI under variable clouds. Our observations commenced at 2006 Apr 28.23 UTC, and consisted in 18 x 60 sec exposures in J-band. Visual inspection of the combined J-band image does not reveal any afterglow candidate at the XRT position to a limiting magnitude of J ~ 20.5 mag, based on three 2MASS sources in the field. Additional H-band exposures have not yet been examined.
The afterglow is therefore likely faint, rather than at high redshift.
We thank Tom Matheson and the Gemini North observing team for performing these ToO observations.
GCN Circular #5020
V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, A.Belinski, E.Gorbovskoy, A.Krylov, G.Borisov, A.Sankovich, N.Shatskiy, V.Vladimirov S.Korobkin, P.Gritsyk
Sternberg Astronomical Institute, Moscow Union 'Optic' MASTER robotic system (http://observ.pereplet.ru) responded to GRB060427.4 (GRB_TIME is 2006-04-27 09:04:33.53, V. Mangano, S. D. Barthelmy et al.(GCN5006). The first image was at 2006-04-27 18:18:07 UT, 09:13:33.47 after the GRB time The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B). The robot not find OT-candidate in error box (V. Mangano et al. GCN5010) brighter then 17.5 (s/n=3). This work is supported by RFFI 04-02-16411 grant. This message can be cited. Mailto: lipunov@sai.msu.ru

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Jochen Greiner, last update: 28-Apr-2006 [Disclaimer]