Gamma-ray Burst 110223B

(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:     Wed 23 Feb 11 21:26:20 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     446677,   Seg_Num: 0
GRB_RA:          150.276d {+10h 01m 06s} (J2000),
                 150.341d {+10h 01m 22s} (current),
                 149.982d {+09h 59m 56s} (1950)
GRB_DEC:         -68.329d {-68d 19' 44"} (J2000),
                 -68.383d {-68d 22' 58"} (current),
                 -68.088d {-68d 05' 15"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       9417 [cnts]    Image_Peak=249 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   262     E_range: 25-100 keV
BKG_INTEN:       92585 [cnts]
BKG_TIME:        77113.30 SOD {21:25:13.30} UT
BKG_DUR:         24 [sec]
GRB_DATE:        15615 TJD;    54 DOY;   11/02/23
GRB_TIME:        77148.05 SOD {21:25:48.05} UT
GRB_PHI:         173.46 [deg]
GRB_THETA:         8.61 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.58 [sigma]
IMAGE_SIGNIF:    7.10 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -3  +0  +0 +20  +0 
SUN_POSTN:       336.75d {+22h 27m 01s}   -9.71d {-09d 42' 33"}
SUN_DIST:        101.77 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.73d {+15h 10m 55s}  -21.26d {-21d 15' 28"}
MOON_DIST:        65.67 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      212.17,-67.74 [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 = 36.04,-15.57 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Feb 11 21:27:16 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.268d {+10h 01m 04s} (J2000)
POINT_DEC:       -68.326d {-68d 19' 33"} (J2000)
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77220.03 SOD {21:27:00.03} UT,   72.0 [sec] since BAT Trigger Time
COUNTS:          18    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:     Wed 23 Feb 11 21:29:32 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     446677,   Seg_Num: 0
GRB_RA:          150.276d {+10h 01m 06s} (J2000),
                 150.341d {+10h 01m 22s} (current),
                 149.982d {+09h 59m 56s} (1950)
GRB_DEC:         -68.329d {-68d 19' 44"} (J2000),
                 -68.383d {-68d 22' 58"} (current),
                 -68.088d {-68d 05' 15"} (1950)
GRB_DATE:        15615 TJD;    54 DOY;   11/02/23
GRB_TIME:        77148.05 SOD {21:25:48.05} UT
TRIGGER_INDEX:   262
GRB_PHI:         173.46 [deg]
GRB_THETA:         8.61 [deg]
DELTA_TIME:      45.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.58 [sigma]
IMAGE_SIGNIF:    7.10 [sigma]
LC_URL:          sw00446677000msb.lc
SUN_POSTN:       336.75d {+22h 27m 01s}   -9.71d {-09d 42' 30"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.76d {+15h 11m 03s}  -21.26d {-21d 15' 50"}
MOON_DIST:        65.67 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      212.17,-67.74 [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 = 36.04,-15.57 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Feb 11 21:30:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.267d {+10h 01m 04s} (J2000)
POINT_DEC:       -68.326d {-68d 19' 33"} (J2000)
POINT_ROLL:      186.524d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77225.13 SOD {21:27:05.13} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.583
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        513 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1472 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00446677000msufc0077.fits
SUN_POSTN:       336.76d {+22h 27m 01s}   -9.71d {-09d 42' 30"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.77d {+15h 11m 04s}  -21.27d {-21d 15' 54"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Feb 11 21:30:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.267d {+10h 01m 04s} (J2000)
POINT_DEC:       -68.326d {-68d 19' 33"} (J2000)
POINT_ROLL:      186.524d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77225.13 SOD {21:27:05.13} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.583
N_STARS:         190
X_OFFSET:        467 [pixels]
Y_OFFSET:        513 [pixels]
X_MAX:           1426 [pixels]
Y_MAX:           1472 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00446677000msufc0077.fits
SUN_POSTN:       336.76d {+22h 27m 01s}   -9.71d {-09d 42' 29"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.77d {+15h 11m 05s}  -21.27d {-21d 15' 57"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:31:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.267d {+10h 01m 04s} (J2000)
POINT_DEC:       -68.326d {-68d 19' 33"} (J2000)
ROLL:            186.524d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77225.13 SOD {21:27:05.13} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     320189231
X_OFFSET:        786 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00446677000msuni0084.fits
SUN_POSTN:       336.76d {+22h 27m 01s}   -9.71d {-09d 42' 28"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.78d {+15h 11m 08s}  -21.27d {-21d 16' 05"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:31:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.267d {+10h 01m 04s} (J2000)
POINT_DEC:       -68.326d {-68d 19' 33"} (J2000)
ROLL:            186.524d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77225.13 SOD {21:27:05.13} UT,   77.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     320189231
X_OFFSET:        786 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00446677000msuni0084.fits
SUN_POSTN:       336.76d {+22h 27m 01s}   -9.71d {-09d 42' 28"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.78d {+15h 11m 08s}  -21.27d {-21d 16' 06"}
MOON_DIST:        65.68 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:34:04 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     446677,   Seg_Num: 0
GRB_RA:          150.2301d {+10h 00m 55.22s} (J2000),
                 150.2955d {+10h 01m 10.91s} (current),
                 149.9364d {+09h 59m 44.73s} (1950)
GRB_DEC:         -68.3004d {-68d 18' 01.4"} (J2000),
                 -68.3543d {-68d 21' 15.4"} (current),
                 -68.0591d {-68d 03' 32.7"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77269.00 SOD {21:27:49.00} UT,   120.9 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       336.76d {+22h 27m 02s}   -9.71d {-09d 42' 26"}
SUN_DIST:        101.80 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.81d {+15h 11m 14s}  -21.27d {-21d 16' 22"}
MOON_DIST:        65.70 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.18,-10.46 [deg] galactic lon,lat of the burst
ECL_COORDS:      212.08,-67.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Feb 11 21:35:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
POINT_ROLL:      186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77438.17 SOD {21:30:38.17} UT,   290.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.820
N_STARS:         190
X_OFFSET:        227 [pixels]
Y_OFFSET:        273 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1712 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00446677000msufc0290.fits
SUN_POSTN:       336.76d {+22h 27m 02s}   -9.71d {-09d 42' 25"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.82d {+15h 11m 17s}  -21.28d {-21d 16' 32"}
MOON_DIST:        65.69 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Feb 11 21:35:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
POINT_ROLL:      186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77438.17 SOD {21:30:38.17} UT,   290.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.820
N_STARS:         190
X_OFFSET:        227 [pixels]
Y_OFFSET:        273 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1712 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00446677000msufc0290.fits
SUN_POSTN:       336.76d {+22h 27m 02s}   -9.71d {-09d 42' 24"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.82d {+15h 11m 18s}  -21.28d {-21d 16' 34"}
MOON_DIST:        65.69 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:36:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
ROLL:            186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77438.17 SOD {21:30:38.17} UT,   290.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     320189444
X_OFFSET:        786 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00446677000msuni0297.fits
SUN_POSTN:       336.76d {+22h 27m 02s}   -9.71d {-09d 42' 23"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.84d {+15h 11m 21s}  -21.28d {-21d 16' 42"}
MOON_DIST:        65.69 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:37:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
ROLL:            186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77438.17 SOD {21:30:38.17} UT,   290.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     320189444
X_OFFSET:        786 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00446677000msuni0297.fits
SUN_POSTN:       336.76d {+22h 27m 02s}   -9.71d {-09d 42' 23"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.84d {+15h 11m 21s}  -21.28d {-21d 16' 44"}
MOON_DIST:        65.69 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:37:15 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     446677,   Seg_Num: 0
GRB_RA:          150.2341d {+10h 00m 56.18s} (J2000),
                 150.2995d {+10h 01m 11.87s} (current),
                 149.9404d {+09h 59m 45.68s} (1950)
GRB_DEC:         -68.3018d {-68d 18' 06.4"} (J2000),
                 -68.3557d {-68d 21' 20.4"} (current),
                 -68.0605d {-68d 03' 37.7"} (1950)
GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  77269.00 SOD {21:27:49.00} UT,   120.9 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       336.76d {+22h 27m 02s}   -9.71d {-09d 42' 23"}
SUN_DIST:        101.80 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.84d {+15h 11m 21s}  -21.28d {-21d 16' 44"}
MOON_DIST:        65.70 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.18,-10.46 [deg] galactic lon,lat of the burst
ECL_COORDS:      212.08,-67.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN Circular #11754
M. Stamatikos (OSU/NASA/GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), P. A. Evans (U Leicester), J. M. Gelbord (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), J. L. Racusin (NASA/GSFC), E. Sonbas (GSFC/USRA/Adiyaman Univ.), R. L. C. Starling (U Leicester), C. A. Swenson (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team:
At 21:25:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110223B (trigger=446677). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 150.276, -68.329 which is
```
   RA(J2000) = 10h 01m 06s
   Dec(J2000) = -68d 19' 44"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 5 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 21:27:00.0 UT, 72.0 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 150.2339, -68.3019 which is equivalent to:
```
   RA(J2000)  = 10h 00m 56.15s
   Dec(J2000) = -68d 18' 06.7"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 112 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.29 x 10^21 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 77 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The coverage of the XRT error circle by the 8'x8' region for the list of sources generated on-board is uncertain because the large number of sources filled the available telemetry. No correction has been made for the expected extinction corresponding to E(B-V) of 0.23.
Burst Advocate for this burst is M. Stamatikos (Michael.Stamatikos-1 AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Feb 11 21:43:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
POINT_ROLL:      186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  78018.08 SOD {21:40:18.08} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.561
N_STARS:         190
X_OFFSET:        227 [pixels]
Y_OFFSET:        273 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1712 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00446677000msufc0870.fits
SUN_POSTN:       336.76d {+22h 27m 03s}   -9.71d {-09d 42' 18"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.90d {+15h 11m 36s}  -21.29d {-21d 17' 26"}
MOON_DIST:        65.71 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Feb 11 21:43:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
POINT_ROLL:      186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  78018.08 SOD {21:40:18.08} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.561
N_STARS:         190
X_OFFSET:        227 [pixels]
Y_OFFSET:        273 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1712 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00446677000msufc0870.fits
SUN_POSTN:       336.76d {+22h 27m 03s}   -9.71d {-09d 42' 17"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.90d {+15h 11m 37s}  -21.29d {-21d 17' 29"}
MOON_DIST:        65.71 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:44:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
ROLL:            186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  78018.08 SOD {21:40:18.08} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     320190024
X_OFFSET:        786 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00446677000msuni0877.fits
SUN_POSTN:       336.76d {+22h 27m 04s}   -9.70d {-09d 42' 16"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.92d {+15h 11m 40s}  -21.29d {-21d 17' 38"}
MOON_DIST:        65.71 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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:     Wed 23 Feb 11 21:45:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     446677,   Seg_Num: 0
POINT_RA:        150.261d {+10h 01m 03s} (J2000)
POINT_DEC:       -68.327d {-68d 19' 35"} (J2000)
ROLL:            186.529d
IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
IMG_START_TIME:  78018.08 SOD {21:40:18.08} UT,   870.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     320190024
X_OFFSET:        786 [pixels]
Y_OFFSET:        832 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       946
Y_GRB_POS:       992
BINNING_INDEX:   1
IM_URL:          sw00446677000msuni0877.fits
SUN_POSTN:       336.76d {+22h 27m 04s}   -9.70d {-09d 42' 16"}
SUN_DIST:        101.78 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      227.92d {+15h 11m 41s}  -21.29d {-21d 17' 39"}
MOON_DIST:        65.71 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      288.21,-10.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.15,-67.74 [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 #11756
V. Sudilovsky, J. Elliott, F. Olivares E., and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 110223B (Swift trigger 446677; Stamatikos et al., GCN #11754) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations started at 00:05 UT on February 24th, 2.7 hours after the GRB trigger, and are continuing. They were performed at an average seeing of 1.4" and at an average airmass of 1.6.
We found a single point source within the 2.1" Swift/XRT error circle reported by Stamatikos et al. (GCN #11754) at
```
RA (J2000.0) = 10h 00m 55.98s
DEC (J2000.0) = -68d 18' 06.0"
```
with an uncertainty of 0.3" in each coordinate.
Based on 7.7 min exposure started at 00:30 UT, we estimate a preliminary r'-band magnitude of 22.1 +/- 0.1 calibrated against GROND zero points (AB system). No statements about the variability can be made at this stage. This measurement is not corrected for the considerable Galactic foreground extinction corresponding to a reddening of E(B-V)=3D0.226 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11757
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-120 to T+293 sec from recent telemetry downlinks, we report further analysis of BAT GRB 110223B (trigger #446677) (Stamatikos, et al., GCN Circ. 11754). The BAT ground-calculated position is RA, Dec = 150.340, -68.329 deg, which is
```
   RA(J2000)  =  10h 01m 21.6s 
   Dec(J2000) = -68d 19' 44.3" 
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows the burst start with a small peak at ~T-45 sec, a slightly larger peak at ~T+2 sec out to ~T+20 sec, with on-going low-level emission out to ~T+150 sec. T90 (15-350 keV) is 54.0 +- 8.5 sec (estimated error including systematics).
The time-averaged spectrum from T-45 to T+20 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.65 +- 0.21. The fluence in the 15-150 keV band is 6.1 +- 0.8 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.99 sec in the 15-150 keV band is 0.6 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/446677/BA/
GCN Circular #11758
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 2282 s of XRT Photon Counting mode data and 4 UVOT images for GRB 110223B, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 150.23341, -68.30155 which is equivalent to:
```
RA (J2000): 10h 00m 56.02s
Dec (J2000): -68d 18' 05.6"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #11760
A. Rowlinson (U. Leicester) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift-XRT team:
We have analysed 5.3 ks of XRT data for GRB 110223B (Stamatikos et al. GCN Circ. 11754), from 56 s to 24.6 ks after the BAT trigger. The data comprise 85 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 11758).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.8 (+0.9, -0.7), followed by a break at T+99.5 s to an alpha of 0.92 (+/-0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.85 (+/-0.16). The best-fitting absorption column is 1.7 (+0.5, -0.4) x 10^21 cm^-2, consistent with the Galactic value of 1.3 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.5 x 10^-11 (5.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.7 (+0.5, -0.4) x 10^21 cm^-2
Galactic foreground: 1.3 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.85 (+/-0.16)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00446677.
This circular is an official product of the Swift-XRT team.
GCN Circular #11765
Swift UVOT observations of GRB110223b
M. De Pasquale (MSSL-UCL) and M. Stamatikos (GSFC) report, on behalf of the Swift team:
Swift/UVOT began settled exposures of GRB110223b (Stamatikos et al. GCN circ. 11754) 77 s after the trigger with a white finding chart. There is an uncatalogued source 1.5 arcseconds from the enhanced XRT afterglow position (Beardmore et al., GCN circ. 11758). This position is also consistent with the optical transient found by GROND (Sudilovsky et al., GCN circ. 11756)
This source, which we identify as the optical afterglow of the burst, is detected in white, v, b, u. Magnitudes and 3 sigma upper limits, derived using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627), are shown in the table below. We caution that the photometry is complicated by a crowded field.
```
Filter        T_start(s)    T_end(s)        exp           Magnitude

white (FC)       77            227          147.4       18.98 =B1 0.10
white           620            814           39.0       19.70 =B1 0.30
white           870           1546          206.0       19.61 =B1 0.13

v               620           1596          117.3       17.88 =B1 0.15

b               546           1522           97.4       19.57 =B1 0.30

u (FC)          290            540          245.8       19.20 =B1 0.19
u               694           1496           77.8       >19.30

uw1             670           1471           97.4       >19.16

um2             645           1445           97.4       >18.78

uw2             596          1572           116.7       >19.16
```
These magnitudes are not corrected for the strong Galactic extinction along the line of sight, corresponding to E(B-V) =3D 0.23 (Schlegel et al. 1998)

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Jochen Greiner, last update: 24-Feb-2011 [Disclaimer]