Gamma-ray Burst 110223A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 23 Feb 11 20:59:19 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     446674,   Seg_Num: 0
  GRB_RA:          345.599d {+23h 02m 24s} (J2000),
                   345.371d {+23h 01m 29s} (current),
                   346.451d {+23h 05m 48s} (1950)
  GRB_DEC:         +87.567d {+87d 34' 03"} (J2000),
                   +87.628d {+87d 37' 39"} (current),
                   +87.297d {+87d 17' 50"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       8536 [cnts]    Image_Peak=229 [image_cnts]
  TRIGGER_DUR:     2.048 [sec] 
  TRIGGER_INDEX:   473     E_range: 25-100 keV
  BKG_INTEN:       88584 [cnts]
  BKG_TIME:        75385.30 SOD {20:56:25.30} UT
  BKG_DUR:         24 [sec]
  GRB_DATE:        15615 TJD;    54 DOY;   11/02/23
  GRB_TIME:        75419.22 SOD {20:56:59.22} UT
  GRB_PHI:          66.09 [deg]
  GRB_THETA:        23.58 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     9.89 [sigma]
  IMAGE_SIGNIF:    7.37 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +1  +2  -3  +0  +0 +12  +0 
  SUN_POSTN:       336.73d {+22h 26m 56s}   -9.72d {-09d 42' 58"}
  SUN_DIST:         97.37 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.45d {+15h 09m 49s}  -21.20d {-21d 12' 17"}
  MOON_DIST:       112.30 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.70, 24.96 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       83.95, 67.05 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
  COMMENTS:        probably due to it occurring during a Malindi downlink session.  
  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 = 258.35,20.22 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 23 Feb 11 21:00:22 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     446674,   Seg_Num: 0
  GRB_RA:          345.8266d {+23h 03m 18.3s} (J2000),
                   345.6059d {+23h 02m 25.4s} (current),
                   346.6508d {+23h 06m 36.1s} (1950)
  GRB_DEC:         +87.5588d {+87d 33' 31.6"} (J2000),
                   +87.6189d {+87d 37' 08.1"} (current),
                   +87.2883d {+87d 17' 17.9"} (1950)
  GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       33 [cnts]
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75507.79 SOD {20:58:27.79} UT,   88.6 [sec] since BAT Trigger Time
  CENTROID_X:      299.43,  raw= 299  [pixels]
  CENTROID_Y:      294.81,  raw= 295  [pixels]
  ROLL:            189.12 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -7.50
  GRB_POS_XRT_Z:   -6.76
  IMAGE_URL:       sw00446674000msxps_rw.img
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 57"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.47d {+15h 09m 52s}  -21.21d {-21d 12' 24"}
  MOON_DIST:       112.31 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the burst
  ECL_COORDS:       83.92, 67.04 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 23 Feb 11 21:00:19 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     446674,   Seg_Num: 0
  GRB_RA:          345.8266d {+23h 03m 18.38s} (J2000),
                   345.6059d {+23h 02m 25.41s} (current),
                   346.6508d {+23h 06m 36.19s} (1950)
  GRB_DEC:         +87.5588d {+87d 33' 31.6"} (J2000),
                   +87.6189d {+87d 37' 08.1"} (current),
                   +87.2883d {+87d 17' 17.9"} (1950)
  GRB_ERROR:       5.7 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       8.97e-10 [erg/cm2/sec]
  GRB_SIGNIF:      5.74 [sigma]
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75507.79 SOD {20:58:27.79} UT,   88.6 [sec] since BAT Trigger Time
  TAM[0-3]:        327.65 237.23 261.58 243.17
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 57"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.46d {+15h 09m 52s}  -21.21d {-21d 12' 24"}
  MOON_DIST:       112.31 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the burst
  ECL_COORDS:       83.92, 67.04 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 0.77 arcmin from the BAT position.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 23 Feb 11 21:00:21 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     446674,   Seg_Num: 0
  GRB_RA:          345.8266d {+23h 03m 18.3s} (J2000),
                   345.6059d {+23h 02m 25.4s} (current),
                   346.6508d {+23h 06m 36.1s} (1950)
  GRB_DEC:         +87.5588d {+87d 33' 31.6"} (J2000),
                   +87.6189d {+87d 37' 08.1"} (current),
                   +87.2883d {+87d 17' 17.9"} (1950)
  GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       33 [cnts]
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75507.79 SOD {20:58:27.79} UT,   88.6 [sec] since BAT Trigger Time
  CENTROID_X:      299.43,  raw= 299  [pixels]
  CENTROID_Y:      294.81,  raw= 295  [pixels]
  ROLL:            189.12 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -7.50
  GRB_POS_XRT_Z:   -6.76
  IMAGE_URL:       sw00446674000msxps_rw.img
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 57"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.47d {+15h 09m 52s}  -21.21d {-21d 12' 24"}
  MOON_DIST:       112.31 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the burst
  ECL_COORDS:       83.92, 67.04 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 23 Feb 11 21:01:33 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     446674,   Seg_Num: 0
  GRB_RA:          345.599d {+23h 02m 24s} (J2000),
                   345.371d {+23h 01m 29s} (current),
                   346.451d {+23h 05m 48s} (1950)
  GRB_DEC:         +87.567d {+87d 34' 03"} (J2000),
                   +87.628d {+87d 37' 39"} (current),
                   +87.297d {+87d 17' 50"} (1950)
  GRB_DATE:        15615 TJD;    54 DOY;   11/02/23
  GRB_TIME:        75419.22 SOD {20:56:59.22} UT
  TRIGGER_INDEX:   473
  GRB_PHI:          66.09 [deg]
  GRB_THETA:        23.58 [deg]
  DELTA_TIME:      -31.00 [sec]
  TRIGGER_DUR:     2.048 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     9.89 [sigma]
  IMAGE_SIGNIF:    7.37 [sigma]
  LC_URL:          sw00446674000msb.lc
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 56"}
  SUN_DIST:         97.37 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.48d {+15h 09m 55s}  -21.21d {-21d 12' 32"}
  MOON_DIST:       112.30 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.70, 24.96 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       83.95, 67.05 [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 = 258.35,20.22 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 23 Feb 11 21:02:18 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.881d {+23h 03m 31s} (J2000)
  POINT_DEC:       +87.561d {+87d 33' 39"} (J2000)
  POINT_ROLL:      189.119d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75516.26 SOD {20:58:36.26} UT,   97.0 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.347
  N_STARS:         132
  X_OFFSET:        480 [pixels]
  Y_OFFSET:        664 [pixels]
  X_MAX:           1439 [pixels]
  Y_MAX:           1623 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00446674000msufc0097.fits
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 55"}
  SUN_DIST:         97.37 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.48d {+15h 09m 56s}  -21.21d {-21d 12' 38"}
  MOON_DIST:       112.32 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.93, 67.04 [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 21:02:39 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.881d {+23h 03m 31s} (J2000)
  POINT_DEC:       +87.561d {+87d 33' 39"} (J2000)
  POINT_ROLL:      189.119d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75516.26 SOD {20:58:36.26} UT,   97.0 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        2.347
  N_STARS:         132
  X_OFFSET:        480 [pixels]
  Y_OFFSET:        664 [pixels]
  X_MAX:           1439 [pixels]
  Y_MAX:           1623 [pixels]
  DET_THRESH:      13
  PHOTO_THRESH:    7
  SL_URL:          sw00446674000msufc0097.fits
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 55"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.49d {+15h 09m 57s}  -21.21d {-21d 12' 40"}
  MOON_DIST:       112.32 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.93, 67.04 [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 21:03:46 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.881d {+23h 03m 31s} (J2000)
  POINT_DEC:       +87.561d {+87d 33' 39"} (J2000)
  ROLL:            189.119d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75516.26 SOD {20:58:36.26} UT,   97.0 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     320187522
  X_OFFSET:        807 [pixels]
  Y_OFFSET:        893 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       967
  Y_GRB_POS:       1053
  BINNING_INDEX:   1
  IM_URL:          sw00446674000msuni0104.fits
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 54"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.50d {+15h 10m 00s}  -21.21d {-21d 12' 48"}
  MOON_DIST:       112.32 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.93, 67.04 [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:     Wed 23 Feb 11 21:04:06 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.881d {+23h 03m 31s} (J2000)
  POINT_DEC:       +87.561d {+87d 33' 39"} (J2000)
  ROLL:            189.119d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75516.26 SOD {20:58:36.26} UT,   97.0 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     320187522
  X_OFFSET:        807 [pixels]
  Y_OFFSET:        893 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       967
  Y_GRB_POS:       1053
  BINNING_INDEX:   1
  IM_URL:          sw00446674000msuni0104.fits
  SUN_POSTN:       336.74d {+22h 26m 57s}   -9.72d {-09d 42' 54"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.50d {+15h 10m 01s}  -21.21d {-21d 12' 50"}
  MOON_DIST:       112.32 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.93, 67.04 [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:     Wed 23 Feb 11 21:09:32 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.897d {+23h 03m 35s} (J2000)
  POINT_DEC:       +87.558d {+87d 33' 31"} (J2000)
  POINT_ROLL:      189.133d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75728.37 SOD {21:02:08.37} UT,   309.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.536
  N_STARS:         100
  X_OFFSET:        487 [pixels]
  Y_OFFSET:        573 [pixels]
  X_MAX:           1446 [pixels]
  Y_MAX:           1532 [pixels]
  DET_THRESH:      7
  PHOTO_THRESH:    3
  SL_URL:          sw00446674000msufc0309.fits
  SUN_POSTN:       336.74d {+22h 26m 58s}   -9.71d {-09d 42' 49"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.56d {+15h 10m 14s}  -21.22d {-21d 13' 29"}
  MOON_DIST:       112.33 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.92, 67.04 [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 21:09:48 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.897d {+23h 03m 35s} (J2000)
  POINT_DEC:       +87.558d {+87d 33' 31"} (J2000)
  POINT_ROLL:      189.133d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75728.37 SOD {21:02:08.37} UT,   309.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.536
  N_STARS:         100
  X_OFFSET:        487 [pixels]
  Y_OFFSET:        573 [pixels]
  X_MAX:           1446 [pixels]
  Y_MAX:           1532 [pixels]
  DET_THRESH:      7
  PHOTO_THRESH:    3
  SL_URL:          sw00446674000msufc0309.fits
  SUN_POSTN:       336.74d {+22h 26m 58s}   -9.71d {-09d 42' 48"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.56d {+15h 10m 15s}  -21.23d {-21d 13' 31"}
  MOON_DIST:       112.33 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.92, 67.04 [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 21:10:17 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     446674,   Seg_Num: 0
  GRB_RA:          345.8575d {+23h 03m 25.80s} (J2000),
                   345.6378d {+23h 02m 33.07s} (current),
                   346.6777d {+23h 06m 42.65s} (1950)
  GRB_DEC:         +87.5571d {+87d 33' 25.5"} (J2000),
                   +87.6172d {+87d 37' 02.0"} (current),
                   +87.2866d {+87d 17' 11.6"} (1950)
  GRB_ERROR:       2.3 [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:  75560.00 SOD {20:59:20.00} UT,   140.8 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       336.74d {+22h 26m 58s}   -9.71d {-09d 42' 48"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.57d {+15h 10m 16s}  -21.23d {-21d 13' 34"}
  MOON_DIST:       112.33 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the burst
  ECL_COORDS:       83.92, 67.04 [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 0.58% < P(seren) < 1.1%.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 23 Feb 11 21:10:58 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.897d {+23h 03m 35s} (J2000)
  POINT_DEC:       +87.558d {+87d 33' 31"} (J2000)
  ROLL:            189.133d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75728.37 SOD {21:02:08.37} UT,   309.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     320187735
  X_OFFSET:        807 [pixels]
  Y_OFFSET:        893 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       967
  Y_GRB_POS:       1053
  BINNING_INDEX:   1
  IM_URL:          sw00446674000msuni0316.fits
  SUN_POSTN:       336.74d {+22h 26m 58s}   -9.71d {-09d 42' 47"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.57d {+15h 10m 17s}  -21.23d {-21d 13' 39"}
  MOON_DIST:       112.33 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.92, 67.04 [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:     Wed 23 Feb 11 21:11:13 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     446674,   Seg_Num: 0
  POINT_RA:        345.897d {+23h 03m 35s} (J2000)
  POINT_DEC:       +87.558d {+87d 33' 31"} (J2000)
  ROLL:            189.133d
  IMG_START_DATE:  15615 TJD;    54 DOY;   11/02/23
  IMG_START_TIME:  75728.37 SOD {21:02:08.37} UT,   309.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     320187735
  X_OFFSET:        807 [pixels]
  Y_OFFSET:        893 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       967
  Y_GRB_POS:       1053
  BINNING_INDEX:   1
  IM_URL:          sw00446674000msuni0316.fits
  SUN_POSTN:       336.74d {+22h 26m 58s}   -9.71d {-09d 42' 47"}
  SUN_DIST:         97.36 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
  MOON_POSTN:      227.58d {+15h 10m 18s}  -21.23d {-21d 13' 41"}
  MOON_DIST:       112.33 [deg]
  MOON_ILLUM:      62 [%]
  GAL_COORDS:      121.71, 24.95 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       83.92, 67.04 [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 Circular #11753
  T. Sakamoto (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), 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), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), E. Sonbas (GSFC/USRA/Adiyaman Univ.), M. Stamatikos (OSU/NASA/GSFC) and C. A. Swenson (PSU) report on behalf of the Swift Team:
  At 20:56:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110223A (trigger=446674). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 345.599, +87.567 which is

     RA(J2000)  =  23h 02m 24s
     Dec(J2000) = +87d 34' 03"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 5 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~1 sec after the trigger.
  The XRT began observing the field at 20:58:27.8 UT, 88.6 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 345.85923, 87.55851 which is equivalent to:

     RA(J2000)  = 23h 03m 26.22s
     Dec(J2000) = +87d 33' 30.6"
  

  with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 50 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 in excess of the Galactic value (5.61 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.5 (+1.82/-1.63) x 10^21 cm^-2 (90% confidence).
  The initial flux in the 2.5 s image was 8.97e-10 erg cm^-2 s^-1 (0.2-10 keV).
  UVOT took a finding chart exposure of 150 seconds with the White filter starting 97 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 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 0.34.
  Burst Advocate for this burst is T. Sakamoto (Taka.Sakamoto 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 Circular #11755
  M. Jelinek, (IAA-CSIC), A. de Ugarte Postigo (DARK/NBI), P. Kubanek and A.J. Castro-Tirado (IAA-CSIC) on behalf of a larger collaboration report:
  We have observed the afterglow of GRB 110223A (Sakamoto et al., GCNC 11753) with the 0.6m TELMA/BOOTES-2 located in Malaga (Spain). R-band observations began 228 seconds after the burst. We do not detect any source within the XRT error box down to the following detection limits, as compared with the USNO-B1.0 catalogue:

  exp start(t-t0)	integration	3-sigma limit
  228		3		15.4
  228     	669		17.6
  930		1035		18.0
  

  This message can be cited.
• GCN Circular #11759
  P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
  Using 539 s of XRT Photon Counting mode data and 1 UVOT images for GRB 110223A, 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 = 345.85354, +87.55766 which is equivalent to:

  RA (J2000): 23h 03m 24.85s
  Dec (J2000): +87d 33' 27.6"
  

  with an uncertainty of 2.0 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 #11761
  O. M. Littlejohns (U. Leicester) and T. Sakamoto (NASA/UMBC) report on behalf of the Swift-XRT team:
  We have analysed 2.7 ks of XRT data for GRB 110223A (Sakamoto et al. GCN Circ. 11753), from 78 s to 29.6 ks after the BAT trigger. The data comprise 40 s in Windowed Timing (WT) mode (the first 8 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 Evans et al. (GCN. Circ 11759).
  The light curve can be modelled with an initial power-law decay with an index of alpha=2.96 (+0.50, -0.27), followed by a break at T+386 s to an alpha of 0.52 (+0.15, -0.16).
  A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.4 (+0.4, -0.3). The best-fitting absorption column is 2.3 (+0.9, -0.8) x 10^21 cm^-2, in excess of the Galactic value of 5.6 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (6.6 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     2.3 (+0.9, -0.8) x 10^21 cm^-2
  Galactic foreground: 5.6 x 10^20 cm^-2
  Excess significance: 4.5 sigma
  Photon index:	     2.4 (+0.4, -0.3)
  

  The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00446674.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #11762
  C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), I.A. Steele, C.G. Mundell, S. Kobayashi (Liverpool JMU), A. Gomboc (U. Ljubljana) on behalf of a large collaboration report:
  The 2-m Liverpool Telescope automatically began observing GRB 110223A (Sakamoto et al. GCN Circ. 11753) on February 23, 20:59:47 UT, 2.8 minutes from the GRB trigger time with the SDSS filters riz. Within the UVOT-enhanced XRT error circle (Evans et al., GCN Circ. 11759) we do not find any source down to the following limiting magnitudes.

  Mid time from      Tot Exposure    Filter   Limiting Magnitude
  trigger (s)           (s)
  ------------------------------------------------------------
  1920                  780           r > 22.2
  2320                  720           i > 21.6
  2620                  720           z > 19
  ------------------------------------------------------------
  

  Calibration is against some nearby USNOB-1 stars (R2 and I magnitudes). However, we note the presence of an uncatalogued source at

  RA  =  23:03:20.31,
  Dec = +87:33:29.3 (J2000),
  

  lying 3.4" from the XRT centre with the following magnitudes:

  r = 21.6 +- 0.1
  i = 20.9 +- 0.1
  

  This source does not exhibit any fading during the observations.
• GCN Circular #11763
  M.Sokolowski,T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,J.Uzycki,G.Wrochna (SINS, Swierk), M.Cwiok,W.Dominik,L.W.Piotrowski,A.F.Zarnecki (University of Warsaw), K.Malek,L.Mankiewicz,R.Opiela,M.Siudek,V.Repei (CFT PAN), G.Kasprowicz,M.Zaremba (Warsaw University of Technology), from the "Pi of the Sky" collaboration ( http://grb.fuw.edu.pl ). M. Jelinek and A. J.Castro-Tirado (IAA-CSIC Granada) on behalf of a larger collaboration.
  The wide field "Pi of the Sky North" apparatus installed in the BOOTES-1 station at ESAt/INTA-CEDEA in Mazagon (Huelva, Spain; http://grb.fuw.edu.pl/pi/index.html#piinta_site.htm ) started observing position of GRB 110223A 25 seconds after BAT trigger, 165 seconds after the burst. No new source has been identified on 10s exposures nor on the sums of images corresponding to 50s exposure. Following limits were obtained:

  t_start - t0      start (UT)  end (UT)     3-sigma limit
  
      165            20:59:44  - 20:59:54        11.0
  
      165            20:59:44  - 21:00:45        12.0
  

  where limits are based on the reference star magnitudo in V filter.
• GCN Circular #11764
  W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU/NASA/GSFC), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
  Using the data set from T-240 to T+300 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110223A (trigger #446674) (Sakamoto, et al., GCN Circ. 11753). The BAT ground-calculated position is RA, Dec = 345.386, 87.586 deg which is

     RA(J2000)  =  23h 01m 32.7s 
     Dec(J2000) = +87d 35' 11.3" 
  

  with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 60%.
  The mask-weighted light curve shows a FRED-like peak at ~T+0.5 sec. T90 (15-350 keV) is 7.0 +- 2.2 sec (estimated error including systematics).
  The time-averaged spectrum from T+0.1 to T+8.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.70 +- 0.33. The fluence in the 15-150 keV band is 1.6 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.08 sec in the 15-150 keV band is 0.6 +- 0.2 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/446674/BA/
• GCN Circular #11767
  V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
  K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
  E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, V.Shumkov, S.Shurpakov Sternberg Astronomical Institute, Moscow State University
  V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
  A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
  MASTER II robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located in Amur-Blagoveschensk was pointed to the GRB110223A 7sec after notice time and 147 sec after GRB time. Unfortunately, main telescopes was not in focus. But we have images from Very Wide Filed Cameras mounted on telescope. On our first (5s exposure) set we haven`t found optical transient within SWIFT-BAT error-box (Littlejohns et al., GCN Curc 11761) brighter 12 mag (unfiltered). 12 coaded first images give limit 13 mag (mean time ~ 177 sec after trigger).
  The message may be cited. The first image is available at http://observ.pereplet.ru/images/GRB110223A/first.jpg There is Polar star at right botom angle of the image.
  mailto: lipunov@sai.msu.ru
  
• GCN Circular #11769
  M. De Pasquale (MSSL-UCL) and T. Sakamoto (GSFC) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 110223A 97 s after the BAT trigger (Sakamoto et al., GCN Circ. 11753). No optical afterglow consistent with the XRT enhanced position (Evans et al., GCN circ. 11759) is detected in the initial UVOT exposures nor in the summed exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are:

  Filter       T_start(s)    T_end(s)   Exp     Magnitude
  
  white (fc)        97          246     147	>20.81
  white             97         5588     344	>21.16
  
  v                639         5998     217	>19.40
  
  b                565         5383     216	>20.00
  
  u (fc)           310          559     196	>19.41
  u                310         5177     443	>20.15
  
  uw1             4773         6408     393	>20.13
  
  um2              663         6203     412	>20.14
  
  uw2              615         5794     216	>19.89
  

  The above magnitudes are not corrected for the strong Galactic extinction along the line of sight, corresponding to E(B-V) = 0.34 (Schlegel et al. 1998).
• GCN Circular #11772
  V. Rumyantsev(CrAO), N. Pit (CrAO), A. Pozanenko (IKI) report on behalf of larger =A0GRB =A0follow-up collaboration:
  We observed the field of the Swift GRB 110223A (Sakamoto et al., GCN 11753) with AZT-11 telescope of CrAO starting on Feb. 23 (UT) 22:44 and under seeing of about 2.2 arsces. In the enhanced Swift-XRT position =A0(Evans et al., GCN 11759) we do not detect any object. We also do not detect the uncatalogued source reported by Guidorzi et al., GCN 11762. The photometry is based on the USNO B1.0 star 1775-0024257 (23 03 42.29 +87 32 38.4) assuming R=3D17.73.

  T0+ =A0 =A0 =A0Filter, =A0 Exposure, mag.
  (mid, d) =A0 =A0 =A0 =A0 =A0 =A0 =A0(s)
  
  0.0965 R  21x180    >21.5 (3 sigma)
  

  The finding chart can be found at http://grb.rssi.ru/GRB110223A/GRB110223A_110223_azt11.gif