Gamma-ray Burst 061021

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:39:20 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     234905,   Seg_Num: 0
  GRB_RA:          145.134d {+09h 40m 32s} (J2000),
                   145.212d {+09h 40m 51s} (current),
                   144.558d {+09h 38m 14s} (1950)
  GRB_DEC:         -21.928d {-21d 55' 41"} (J2000),
                   -21.959d {-21d 57' 33"} (current),
                   -21.701d {-21d 42' 02"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       5034 [cnts]    Image_Peak=246 [image_cnts]
  TRIGGER_DUR:     1.024 [sec] 
  TRIGGER_INDEX:   146     E_range: 25-100 keV
  BKG_INTEN:       29475 [cnts]
  BKG_TIME:        56334.47 SOD {15:38:54.47} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        14029 TJD;   294 DOY;   06/10/21
  GRB_TIME:        56347.66 SOD {15:39:07.66} UT
  GRB_PHI:         -62.51 [deg]
  GRB_THETA:        25.22 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     19.31 [sigma]
  IMAGE_SIGNIF:    9.12 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +2 +24  +0  +0 -51  +1 
  SUN_POSTN:       206.10d {+13h 44m 24s}  -10.80d {-10d 47' 53"}
  SUN_DIST:         59.12 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.49d {+13h 17m 58s}  -10.69d {-10d 41' 13"}
  MOON_DIST:        53.03 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.88, 22.65 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      156.06,-33.61 [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 = 273.33,7.64 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:40:51 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     234905,   Seg_Num: 0
  GRB_RA:          145.1485d {+09h 40m 35.6s} (J2000),
                   145.2270d {+09h 40m 54.4s} (current),
                   144.5722d {+09h 38m 17.3s} (1950)
  GRB_DEC:         -21.9515d {-21d 57' 05.3"} (J2000),
                   -21.9826d {-21d 58' 57.3"} (current),
                   -21.7238d {-21d 43' 25.8"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       104 [cnts]
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56420.45 SOD {15:40:20.45} UT,   72.8 [sec] since BAT Trigger Time
  CENTROID_X:      264.03,  raw= 264  [pixels]
  CENTROID_Y:      263.36,  raw= 263  [pixels]
  ROLL:            89.73 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -83.53
  GRB_POS_XRT_Z:   -87.85
  IMAGE_URL:       sw00234905000msxps_rw.img
  SUN_POSTN:       206.10d {+13h 44m 24s}  -10.80d {-10d 47' 54"}
  SUN_DIST:         59.10 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.50d {+13h 18m 01s}  -10.69d {-10d 41' 34"}
  MOON_DIST:        53.02 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.91, 22.64 [deg] galactic lon,lat of the burst
  ECL_COORDS:      156.08,-33.63 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:40:57 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     234905,   Seg_Num: 0
  GRB_RA:          145.1485d {+09h 40m 35.6s} (J2000),
                   145.2270d {+09h 40m 54.4s} (current),
                   144.5722d {+09h 38m 17.3s} (1950)
  GRB_DEC:         -21.9515d {-21d 57' 05.3"} (J2000),
                   -21.9826d {-21d 58' 57.3"} (current),
                   -21.7238d {-21d 43' 25.8"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       104 [cnts]
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56420.45 SOD {15:40:20.45} UT,   72.8 [sec] since BAT Trigger Time
  CENTROID_X:      264.03,  raw= 264  [pixels]
  CENTROID_Y:      263.36,  raw= 263  [pixels]
  ROLL:            89.73 [deg]
  GAIN:            1
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -83.53
  GRB_POS_XRT_Z:   -87.85
  IMAGE_URL:       sw00234905000msxps_rw.img
  SUN_POSTN:       206.10d {+13h 44m 24s}  -10.80d {-10d 47' 54"}
  SUN_DIST:         59.10 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.50d {+13h 18m 01s}  -10.69d {-10d 41' 35"}
  MOON_DIST:        53.02 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.91, 22.64 [deg] galactic lon,lat of the burst
  ECL_COORDS:      156.08,-33.63 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Processed Image.  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:40:51 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     234905,   Seg_Num: 0
  GRB_RA:          145.1485d {+09h 40m 35.6s} (J2000),
                   145.2270d {+09h 40m 54.4s} (current),
                   144.5722d {+09h 38m 17.3s} (1950)
  GRB_DEC:         -21.9515d {-21d 57' 05.3"} (J2000),
                   -21.9826d {-21d 58' 57.3"} (current),
                   -21.7238d {-21d 43' 25.8"} (1950)
  GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       2.68e-09 [erg/cm2/sec]
  GRB_SIGNIF:      10.19 [sigma]
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56420.45 SOD {15:40:20.45} UT,   72.8 [sec] since BAT Trigger Time
  TAM[0-3]:        327.60 237.21 261.31 243.24
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:       206.10d {+13h 44m 24s}  -10.80d {-10d 47' 54"}
  SUN_DIST:         59.10 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.50d {+13h 18m 01s}  -10.69d {-10d 41' 34"}
  MOON_DIST:        53.02 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.91, 22.64 [deg] galactic lon,lat of the burst
  ECL_COORDS:      156.08,-33.63 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:42:46 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     234905,   Seg_Num: 0
  GRB_RA:          145.134d {+09h 40m 32s} (J2000),
                   145.212d {+09h 40m 51s} (current),
                   144.558d {+09h 38m 14s} (1950)
  GRB_DEC:         -21.928d {-21d 55' 41"} (J2000),
                   -21.959d {-21d 57' 33"} (current),
                   -21.701d {-21d 42' 02"} (1950)
  GRB_DATE:        14029 TJD;   294 DOY;   06/10/21
  GRB_TIME:        56347.66 SOD {15:39:07.66} UT
  TRIGGER_INDEX:   146
  GRB_PHI:         -62.51 [deg]
  GRB_THETA:        25.22 [deg]
  DELTA_TIME:      -38.00 [sec]
  TRIGGER_DUR:     1.024 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     19.31 [sigma]
  IMAGE_SIGNIF:    9.12 [sigma]
  LC_URL:          sw00234905000msb.lc
  SUN_POSTN:       206.10d {+13h 44m 25s}  -10.80d {-10d 47' 56"}
  SUN_DIST:         59.12 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.52d {+13h 18m 04s}  -10.70d {-10d 42' 00"}
  MOON_DIST:        53.05 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.88, 22.65 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      156.06,-33.61 [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 = 273.33,7.64 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:43:02 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     234905,   Seg_Num: 0
  POINT_RA:        145.122d {+09h 40m 29s} (J2000)
  POINT_DEC:       -21.928d {-21d 55' 41"} (J2000)
  POINT_ROLL:      89.734d
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56427.94 SOD {15:40:27.94} UT,   80.3 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        3.236
  N_STARS:         51
  X_OFFSET:        568 [pixels]
  Y_OFFSET:        520 [pixels]
  X_MAX:           1527 [pixels]
  Y_MAX:           1479 [pixels]
  DET_THRESH:      15
  PHOTO_THRESH:    8
  SL_URL:          sw00234905000msufc0080.fits
  SUN_POSTN:       206.10d {+13h 44m 25s}  -10.80d {-10d 47' 56"}
  SUN_DIST:         59.13 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.52d {+13h 18m 05s}  -10.70d {-10d 42' 03"}
  MOON_DIST:        53.06 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.87, 22.64 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      156.04,-33.62 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:43:25 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     234905,   Seg_Num: 0
  POINT_RA:        145.122d {+09h 40m 29s} (J2000)
  POINT_DEC:       -21.928d {-21d 55' 41"} (J2000)
  POINT_ROLL:      89.734d
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56427.94 SOD {15:40:27.94} UT,   80.3 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        3.236
  N_STARS:         51
  X_OFFSET:        568 [pixels]
  Y_OFFSET:        520 [pixels]
  X_MAX:           1527 [pixels]
  Y_MAX:           1479 [pixels]
  DET_THRESH:      15
  PHOTO_THRESH:    8
  SL_URL:          sw00234905000msufc0080.fits
  SUN_POSTN:       206.10d {+13h 44m 25s}  -10.80d {-10d 47' 56"}
  SUN_DIST:         59.13 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.52d {+13h 18m 05s}  -10.70d {-10d 42' 08"}
  MOON_DIST:        53.06 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.87, 22.64 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      156.04,-33.62 [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:     Sat 21 Oct 06 15:44:45 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     234905,   Seg_Num: 0
  POINT_RA:        145.122d {+09h 40m 29s} (J2000)
  POINT_DEC:       -21.928d {-21d 55' 41"} (J2000)
  ROLL:            89.734d
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56427.94 SOD {15:40:27.94} UT,   80.3 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     183138029
  X_OFFSET:        1050 [pixels]
  Y_OFFSET:        938 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1210
  Y_GRB_POS:       1098
  BINNING_INDEX:   1
  IM_URL:          sw00234905000msuni0080.fits
  SUN_POSTN:       206.10d {+13h 44m 25s}  -10.80d {-10d 47' 58"}
  SUN_DIST:         59.13 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.53d {+13h 18m 08s}  -10.71d {-10d 42' 26"}
  MOON_DIST:        53.07 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.87, 22.64 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      156.04,-33.62 [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:     Sat 21 Oct 06 15:45:03 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     234905,   Seg_Num: 0
  POINT_RA:        145.122d {+09h 40m 29s} (J2000)
  POINT_DEC:       -21.928d {-21d 55' 41"} (J2000)
  ROLL:            89.734d
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56427.94 SOD {15:40:27.94} UT,   80.3 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     183138029
  X_OFFSET:        1050 [pixels]
  Y_OFFSET:        938 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1210
  Y_GRB_POS:       1098
  BINNING_INDEX:   1
  IM_URL:          sw00234905000msuni0080.fits
  SUN_POSTN:       206.10d {+13h 44m 25s}  -10.80d {-10d 47' 58"}
  SUN_DIST:         59.13 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.53d {+13h 18m 08s}  -10.71d {-10d 42' 30"}
  MOON_DIST:        53.07 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.87, 22.64 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      156.04,-33.62 [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:     Sat 21 Oct 06 15:50:05 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     234905,   Seg_Num: 0
  POINT_RA:        145.120d {+09h 40m 29s} (J2000)
  POINT_DEC:       -21.927d {-21d 55' 37"} (J2000)
  POINT_ROLL:      89.736d
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56533.66 SOD {15:42:13.66} UT,   186.0 [sec] since BAT Trigger Time
  FILTER:          3, V
  BKG_MEAN:        2.747
  N_STARS:         42
  X_OFFSET:        730 [pixels]
  Y_OFFSET:        618 [pixels]
  X_MAX:           1689 [pixels]
  Y_MAX:           1577 [pixels]
  DET_THRESH:      14
  PHOTO_THRESH:    7
  SL_URL:          sw00234905000msufc0186.fits
  SUN_POSTN:       206.11d {+13h 44m 26s}  -10.80d {-10d 48' 02"}
  SUN_DIST:         59.14 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.57d {+13h 18m 17s}  -10.73d {-10d 43' 38"}
  MOON_DIST:        53.10 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.87, 22.64 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      156.04,-33.62 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 21 Oct 06 15:50:22 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     234905,   Seg_Num: 0
  POINT_RA:        145.120d {+09h 40m 29s} (J2000)
  POINT_DEC:       -21.927d {-21d 55' 37"} (J2000)
  POINT_ROLL:      89.736d
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56533.66 SOD {15:42:13.66} UT,   186.0 [sec] since BAT Trigger Time
  FILTER:          3, V
  BKG_MEAN:        2.747
  N_STARS:         42
  X_OFFSET:        730 [pixels]
  Y_OFFSET:        618 [pixels]
  X_MAX:           1689 [pixels]
  Y_MAX:           1577 [pixels]
  DET_THRESH:      14
  PHOTO_THRESH:    7
  SL_URL:          sw00234905000msufc0186.fits
  SUN_POSTN:       206.11d {+13h 44m 26s}  -10.80d {-10d 48' 03"}
  SUN_DIST:         59.14 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.57d {+13h 18m 18s}  -10.73d {-10d 43' 42"}
  MOON_DIST:        53.10 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.87, 22.64 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      156.04,-33.62 [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:     Sat 21 Oct 06 15:51:26 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     234905,   Seg_Num: 0
  POINT_RA:        145.120d {+09h 40m 29s} (J2000)
  POINT_DEC:       -21.927d {-21d 55' 37"} (J2000)
  ROLL:            89.736d
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56533.66 SOD {15:42:13.66} UT,   186.0 [sec] since BAT Trigger Time
  FILTER:          3, V
  EXPOSURE_ID:     183138135
  X_OFFSET:        1050 [pixels]
  Y_OFFSET:        938 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1210
  Y_GRB_POS:       1098
  BINNING_INDEX:   1
  IM_URL:          sw00234905000msuni0186.fits
  SUN_POSTN:       206.11d {+13h 44m 26s}  -10.80d {-10d 48' 03"}
  SUN_DIST:         59.14 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.58d {+13h 18m 20s}  -10.73d {-10d 43' 56"}
  MOON_DIST:        53.11 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.87, 22.64 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      156.04,-33.62 [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:     Sat 21 Oct 06 15:57:42 UT
  NOTICE_TYPE:     Swift-UVOT Position
  TRIGGER_NUM:     234905,   Seg_Num: 0
  GRB_RA:          145.1504d {+09h 40m 36.09s} (J2000),
                   145.2289d {+09h 40m 54.92s} (current),
                   144.5741d {+09h 38m 17.78s} (1950)
  GRB_DEC:         -21.9514d {-21d 57' 05.0"} (J2000),
                   -21.9825d {-21d 58' 57.0"} (current),
                   -21.7237d {-21d 43' 25.4"} (1950)
  GRB_ERROR:       0.4 [arcsec radius, statistical only]
  GRB_MAG:         14.89 +/- 0.50 [mag]
  FILTER:          10, White
  IMG_START_DATE:  14029 TJD;   294 DOY;   06/10/21
  IMG_START_TIME:  56428.00 SOD {15:40:28.00} UT,   80.3 [sec] since BAT Trigger Time
  SUN_POSTN:       206.11d {+13h 44m 27s}  -10.80d {-10d 48' 09"}
  SUN_DIST:         59.11 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
  MOON_POSTN:      199.63d {+13h 18m 31s}  -10.76d {-10d 45' 20"}
  MOON_DIST:        53.12 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      254.91, 22.64 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      156.08,-33.63 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT UVOT Position Notice.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  

• GCN Circular #5743
  A. Moretti (INAF-OAB), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), C. Guidorzi (Univ Bicocca&INAF-OAB), S. T. Holland (GSFC/USRA), J. A. Kennea (PSU), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), S. B. Pandey (UCL-MSSL), A. M. Parsons (GSFC), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), G. Tagliaferri (INAF-OAB) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
  At 15:39:07 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061021 (trigger=234905). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 145.134, -21.928 {09h 40m 32s, -21d 55' 41"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak structure with a duration of about 12 sec. The peak count rate was ~12000 counts/sec (15-350 keV), at ~2 sec after the trigger.
  The XRT began observing the field at 15:40:20 UT, 73 seconds after the BAT trigger. XRT found a variable, uncatalogued X-ray source located at RA(J2000) = 09h 40m 35.6s, Dec(J2000) = -21d 57' 05.3", with an estimated uncertainty of 7.0 arcseconds (90% confidence radius). This location is 97 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 2.7e-09 erg/cm2/s (0.2-10 keV).
  UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 80 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at

    RA(J2000)  =	09:40:36.12 = 145.1505
    DEC(J2000) = -21:57:05.4  = -21.9515
  

  with a 1-sigma error radius of about 0.5 arc sec. This position is 6.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 14.9 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.06.
• GCN Circular #5744
  D. Palmer (LANL), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), A. Moretti (INAF-OAB), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
  Using the data set from T-240 to T+328 sec from recent telemetry downlinks, we report further analysis of BAT GRB 061021 (trigger #234905) (Moretti, et al., GCN Circ. 5743). The BAT ground-calculated position is RA,Dec = 145.146, -21.953 deg {9h 40m 35.0s, -21d 57' 10.4"} (J2000) +- 0.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%.
  The mask-weighted lightcurve shows a cusp-like peak starting at T+0 sec, peaking at T+2.6 sec, and exponetially tailling off to background at T+90 sec. T90 (15-350 keV) is 46 +- 1 sec (estimated error including systematics).
  The time-averaged spectrum from T-0.0 to T+59.9 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.31 +- 0.06. The fluence in the 15-150 keV band is 3.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.44 sec in the 15-150 keV band is 6.1 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
• GCN Circular #5745
  GRB 061021: Swift/UVOT Observations
  S. T. Holland (NASA/GSFC & USRA) and A. Moretti (INAF-OAB) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began observing the field of GRB 061021 at 15:40:27 on 2006-10-21, 80 s after the BAT trigger (Moretti et al., GCN Cir. 5743). An optical counterpart was detected in the White filter (160-650 nm) at a position (RA,Dec) = (09:40:36.12, -21:57:05.4) (J2000) with a 90% confidence interval of 0.6 arcsec.
  The early photometry results are given for the UVOT filters below where start is the time, in seconds, since the BAT trigger. The quoted errors do not include the 0.1 mag systematic uncertainty in the photometric zero points.

        Filter     Start    Exposure    Mag   Err
           V         187       275     16.76 0.06
                    5403       197     18.86 0.22
           B        4789       197     19.15 0.13
                    6221       197     19.33 0.19
           U        4584       197     18.18 0.12
                    6016       197     18.48 0.13
          UVW1      4379       197     17.94 0.35
                    5812       197     18.41 0.17
          UVM2      4175       197     17.63 0.17
                    5607       197     17.89 0.20
          UVW2      5198       197     18.02 0.21
         White        81        98     15.09 0.07
                    4993       197     18.05 0.08
                    6425        25     18.37 0.25
  

  The values quoted above are not corrected for the expected Galactic extinction of E_{B-V} = 0.06 mag (Schlegel et al. 1998).
• GCN Circular #5746
  A. Moretti (INAF-OAB), C. Guidorzi (Univ. Bicocca & INAF-OAB), P. Romano (INAF-OAB) S. Campana (INAF-OAB) report on behalf of the Swift-XRT team:
  We have analysed the first 3 orbits of Swift-XRT data obtained for GRB 061021 (trigger=234905, GCN 5743). The data consist of 189 s in Windowed Timing (WT) mode, starting 78 seconds after the BAT trigger and 5.5 ks in Photon Counting (PC) mode. Using PC data we obtain a refined position of:

  RA(J2000) =  09h 40m 35.87s
  Dec(J2000)= -21d 57' 07.2"
  

  with an estimated uncertainty radius of 5 arcsec (90% containment). This location is 3.8 arcseconds from the UVOT position (GCN 5745).
  The light-curve, initially, shows a steep decay (alpha1=2.1+/-0.1) up to a break at t_break=368+/-20.s. After the break, the afterglow shows a shallow decay (alpha2=0.55+/-0.03) up to the end of the third orbit (t=12.5 ks). At this point the observed count rate was 2.2 counts per second, corresponding to an unabsorbed flux of 1.4E-11 erg/cm2/sec.
  The spectrum formed from all the WT data can be modelled with a power-law of photon index Gamma = 1.88 +/- 0.07, with an absorbing column of NH = (3.4 +/- 0.8)E20 cm^-2 consistent with the Galactic value of 4.20E20 cm^-2. The spectrum formed from the PC data is slightly softer than the WT spectrum: it can be modelled with a power-law of photon index Gamma = 1.96 +/- 0.08. All errors are quoted at 90% confidence level.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #5747
  Christina C. Thoene, Johan P.U. Fynbo (DARK) and Pall Jakobsson (Univ. of Hertfordshire) report on behalf of a larger collaboration:
  We obtained a single 1800s spectrum of the OT of GRB 061021 (GCN 5743) on October 22, 08:07UT, 16.5h after the burst, using FORS1/VLT and grism 300V. At the time of the observation, the OT had a magnitude of about R=20.5, based on photometric zeropoints from the ESO webpages.
  The spectrum displayed a smooth continuum with no emission or absorption lines, although the S/N of the source was resonably high. From the lack of the Ly-alpha forest, a firm upper limit of z<2.0 can be placed on the redshift of the GRB. This is consistent with the UVOT observations (GCN 5745).
  An image of the 2D spectrum can be found at www.astro.ku.dk/~cthoene/GRBs/
  We thank the staff at VLT for performing the observations, especially G. James.
• GCN Report 9.1
  GCN_Report 9.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_9_1.pdf by A.Moretti et al. titled: "Swift Observations of GRB 061021"
• GCN Circular #5748
  S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report:
  The long GRB 061021 (Swift-BAT trigger #234905: Moretti et al., GCN 5743; Palmer et al., GCN 5744) triggered Konus-Wind at T0=56348.304 s UT (15:39:08.304).
  As observed by Konus-Wind the burst shows a single pulse with a duration of ~10 s, followed by a weak tail seen up to T-T0 ~60 s.
  The spectrum of the pulse integrated from T0 to T0+8.448 s is well fitted (in the 20 keV - 2 MeV range) by a power law with exponential cutoff model: dN/dE ~ E^(-alpha) * exp(-(2-alpha)*E/Ep) with alpha = 1.22(-0.14, +0.12) and Ep = 777 (-237, +549) keV (chi2 = 58/59 dof). The fluence of this part is 9.93(-4.14, +0.69)x10^-6 erg/cm2 (in the 20 keV - 2 MeV range).
  The spectrum of the tail integrated from T0+8.448 s to T0+57.600 s can be fitted (in the 20 keV - 2 MeV range) by a simple power law with the photon index 1.93(-0.27, +0.32) (chi2 = 77/60 dof). The fluence of this part is 3.43(-2.20, +0.83)x10^-6 erg/cm2 (in the 20 keV - 2 MeV range). We note that because of the derived photon index is ~2, this fluence value is very sensitive to the upper boundary of the energy range.
  The total burst fluence is 1.34(-0.47, +0.11)x10^-5 erg/cm2, and the 256-ms peak flux measured from T0+0.608 s 3.72(-1.62, +0.53)x10^-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range).
  All the quoted errors are at the 90% confidence level.
• GCN Circular #5749
  GRB 061021, Swift-BAT Lag analysis
  J. Norris (Stanford/SLAC) and S.D. Barthelmy (GSFC) on behalf of the Swift-BAT team:
  We have performed the lag analysis (Norris & Bonnell, ApJ, 2006) on GRB 061021 (trigger 234905) (Moretti et al, GCN Circ 5743 & Palmer et al, GCN Circ 5744) with the following results:

    72 ms +28-48 ms  between the  50-100 and 15-25 keV bands
    98 ms +30-32 ms  between the 100-350 and 25-50 keV bands
   128 ms +49-35 ms  between the 100-350 and 15-25 keV bands
  

  (all with 16-ms binning).
  We conclude that this is a Long Burst (and not a Short Burst with Extended Emission).
• Redshift of z = 0.3463
  0907.3449 from 20 Jul 2009
  Fynbo et al: Low-Resolution Spectroscopy of Gamma-ray Burst Optical Afterglows: Biases in the Swift Sample and Characterization of the Absorbers
  Abstract: (Abridged). We present a sample of 77 optical afterglows (OAs) of Swift detected GRBs for which spectroscopic follow-up observations have been secured. We provide linelists and equivalent widths for all detected lines redward of Ly-alpha. We discuss to what extent the current sample of Swift bursts with OA spectroscopy is a biased subsample of all Swift detected GRBs. For that purpose we define an X-ray selected sample of Swift bursts with optimal conditions for ground-based follow up from the period March 2005 to September 2008; 146 bursts fulfill our sample criteria. We derive the redshift distribution for this sample and conclude that less than 19% of Swift bursts are at z>7. We compare the high energy properties for three sub-samples of bursts in the sample: i) bursts with redshifts measured from OA spectroscopy, ii) bursts with detected OA, but no OA-based redshift, and iii) bursts with no detection of the OA. The bursts in group i) have significantly less excess X-ray absorption than bursts in the other two groups. In addition, the fraction of dark bursts is 14% in group i), 38% in group ii) and > 39% in group iii). From this we conclude that the sample of GRBs with OA spectroscopy is not representative for all Swift bursts, most likely due to a bias against the most dusty sight-lines. Finally, we characterize GRB absorption systems as a class and compare them to QSO absorption systems, in particular DLAs. On average GRB absorbers are characterized by significantly stronger EWs for HI as well as for both low and high ionization metal lines than what is seen in intervening QSO absorbers. Based on the z>2 bursts in the sample we place a 95% confidence upper limit of 7.5% on the mean escape fraction of ionizing photons from star-forming galaxies.
• 1112.4470 from 20 Dec 11
  L. Nava et al.: A complete sample of bright Swift Long Gamma Ray Bursts: testing the spectral-energy correlations
  We use a nearly complete sample of Gamma Ray Bursts (GRBs) detected by the Swift satellite to study the correlations between the spectral peak energy Ep of the prompt emission, the isotropic energetics Eiso and the isotropic luminosity Liso. This GRB sample is characterised by a high level of completeness in redshift (91%). This allows us to probe in an unbiased way the issue related to the physical origin of these correlations against selection effects. We find that one burst, GRB 061021, is an outlier to the Ep-Eiso correlation and another burst, GRB 070328, lies at 3sigma from the Ep-Eiso correlation. Despite these cases, we find strong Ep-Eiso and Ep-Liso correlations for the bursts of the complete sample. Their slopes, normalisations and dispersions are consistent with those found with the whole sample of bursts with measured redshift and Ep. This means that the biases present in the total sample commonly used to study these correlations do not affect their properties. Finally, we also find no evolution with redshift of the Ep-Eiso and Ep-Liso correlations.