Gamma-ray Burst 061027

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:16:20 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     235645,   Seg_Num: 0
GRB_RA:          270.812d {+18h 03m 15s} (J2000),
                 271.178d {+18h 04m 43s} (current),
                 268.132d {+17h 52m 32s} (1950)
GRB_DEC:         -82.228d {-82d 13' 39"} (J2000),
                 -82.227d {-82d 13' 36"} (current),
                 -82.225d {-82d 13' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1448 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        14035 TJD;   300 DOY;   06/10/27
GRB_TIME:        36902.46 SOD {10:15:02.46} UT
GRB_PHI:         -156.57 [deg]
GRB_THETA:        35.16 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.05 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -3  +0  +0 -28  +1 
SUN_POSTN:       211.61d {+14h 06m 27s}  -12.80d {-12d 48' 07"}
SUN_DIST:         73.36 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:      274.11d {+18h 16m 27s}  -28.52d {-28d 31' 27"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.34,-25.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      270.21,-58.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 84.78,-18.73 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:17:37 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.821d {+18h 03m 17s} (J2000)
POINT_DEC:       -82.220d {-82d 13' 11"} (J2000)
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37049.78 SOD {10:17:29.78} UT,   147.3 [sec] since BAT Trigger Time
COUNTS:          5    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:     Fri 27 Oct 06 10:19:15 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     235645,   Seg_Num: 0
GRB_RA:          270.812d {+18h 03m 15s} (J2000),
                 271.178d {+18h 04m 43s} (current),
                 268.132d {+17h 52m 32s} (1950)
GRB_DEC:         -82.228d {-82d 13' 39"} (J2000),
                 -82.227d {-82d 13' 36"} (current),
                 -82.225d {-82d 13' 29"} (1950)
GRB_DATE:        14035 TJD;   300 DOY;   06/10/27
GRB_TIME:        36902.46 SOD {10:15:02.46} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -156.57 [deg]
GRB_THETA:        35.16 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.05 [sigma]
LC_URL:          sw00235645000msb.lc
SUN_POSTN:       211.61d {+14h 06m 27s}  -12.80d {-12d 48' 09"}
SUN_DIST:         73.36 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:      274.14d {+18h 16m 34s}  -28.52d {-28d 31' 23"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.34,-25.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      270.21,-58.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 84.78,-18.73 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:20:00 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.820d {+18h 03m 17s} (J2000)
POINT_DEC:       -82.220d {-82d 13' 11"} (J2000)
POINT_ROLL:      298.984d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37054.11 SOD {10:17:34.11} UT,   151.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.719
N_STARS:         90
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00235645000msufc0151.fits
SUN_POSTN:       211.61d {+14h 06m 27s}  -12.80d {-12d 48' 10"}
SUN_DIST:         73.36 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.15d {+18h 16m 36s}  -28.52d {-28d 31' 22"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.21,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:20:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.820d {+18h 03m 17s} (J2000)
POINT_DEC:       -82.220d {-82d 13' 11"} (J2000)
POINT_ROLL:      298.984d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37054.11 SOD {10:17:34.11} UT,   151.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.719
N_STARS:         90
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00235645000msufc0151.fits
SUN_POSTN:       211.61d {+14h 06m 27s}  -12.80d {-12d 48' 10"}
SUN_DIST:         73.36 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.15d {+18h 16m 37s}  -28.52d {-28d 31' 21"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.21,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:21:30 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.820d {+18h 03m 17s} (J2000)
POINT_DEC:       -82.220d {-82d 13' 11"} (J2000)
ROLL:            298.984d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37054.11 SOD {10:17:34.11} UT,   151.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     183637055
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0151.fits
SUN_POSTN:       211.61d {+14h 06m 27s}  -12.80d {-12d 48' 11"}
SUN_DIST:         73.36 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.16d {+18h 16m 39s}  -28.52d {-28d 31' 20"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.21,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:21:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.820d {+18h 03m 17s} (J2000)
POINT_DEC:       -82.220d {-82d 13' 11"} (J2000)
ROLL:            298.984d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37054.11 SOD {10:17:34.11} UT,   151.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     183637055
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0151.fits
SUN_POSTN:       211.61d {+14h 06m 27s}  -12.80d {-12d 48' 11"}
SUN_DIST:         73.36 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.17d {+18h 16m 40s}  -28.52d {-28d 31' 20"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.21,-58.78 [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:     Fri 27 Oct 06 10:27:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
POINT_ROLL:      298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37159.82 SOD {10:19:19.82} UT,   257.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.131
N_STARS:         95
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00235645000msufc0257.fits
SUN_POSTN:       211.62d {+14h 06m 28s}  -12.80d {-12d 48' 16"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.23d {+18h 16m 54s}  -28.52d {-28d 31' 11"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:28:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
POINT_ROLL:      298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37159.82 SOD {10:19:19.82} UT,   257.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.131
N_STARS:         95
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00235645000msufc0257.fits
SUN_POSTN:       211.62d {+14h 06m 28s}  -12.80d {-12d 48' 17"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.23d {+18h 16m 55s}  -28.52d {-28d 31' 11"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:28:50 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
ROLL:            298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37159.82 SOD {10:19:19.82} UT,   257.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     183637161
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0257.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 17"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.24d {+18h 16m 57s}  -28.52d {-28d 31' 09"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:29:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
ROLL:            298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37159.82 SOD {10:19:19.82} UT,   257.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     183637161
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0257.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 17"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.24d {+18h 16m 58s}  -28.52d {-28d 31' 09"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [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:     Fri 27 Oct 06 10:31:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.218d {-82d 13' 05"} (J2000)
POINT_ROLL:      298.972d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37762.67 SOD {10:29:22.67} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.688
N_STARS:         116
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00235645000msufc0860.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 19"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.27d {+18h 17m 04s}  -28.52d {-28d 31' 06"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:31:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.218d {-82d 13' 05"} (J2000)
POINT_ROLL:      298.972d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37762.67 SOD {10:29:22.67} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.688
N_STARS:         116
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00235645000msufc0860.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 20"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.27d {+18h 17m 05s}  -28.52d {-28d 31' 05"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:32:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.218d {-82d 13' 05"} (J2000)
ROLL:            298.972d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37762.67 SOD {10:29:22.67} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     183637764
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0860.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 20"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.27d {+18h 17m 05s}  -28.52d {-28d 31' 05"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:32:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.218d {-82d 13' 05"} (J2000)
ROLL:            298.972d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37762.67 SOD {10:29:22.67} UT,   860.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     183637764
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0860.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 20"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.28d {+18h 17m 06s}  -28.52d {-28d 31' 04"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [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:     Fri 27 Oct 06 10:33:31 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
POINT_ROLL:      298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37868.34 SOD {10:31:08.34} UT,   965.9 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.391
N_STARS:         69
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00235645000msufc0965.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 21"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.29d {+18h 17m 09s}  -28.52d {-28d 31' 03"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:33:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
POINT_ROLL:      298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37868.34 SOD {10:31:08.34} UT,   965.9 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.391
N_STARS:         69
X_OFFSET:        428 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1387 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00235645000msufc0965.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 21"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.29d {+18h 17m 10s}  -28.52d {-28d 31' 02"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:34:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
ROLL:            298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37868.34 SOD {10:31:08.34} UT,   965.9 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     183637869
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0965.fits
SUN_POSTN:       211.62d {+14h 06m 29s}  -12.81d {-12d 48' 22"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.30d {+18h 17m 11s}  -28.52d {-28d 31' 01"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Oct 06 10:34:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     235645,   Seg_Num: 0
POINT_RA:        270.830d {+18h 03m 19s} (J2000)
POINT_DEC:       -82.219d {-82d 13' 06"} (J2000)
ROLL:            298.973d
IMG_START_DATE:  14035 TJD;   300 DOY;   06/10/27
IMG_START_TIME:  37868.34 SOD {10:31:08.34} UT,   965.9 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     183637869
X_OFFSET:        747 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       907
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw00235645000msuni0965.fits
SUN_POSTN:       211.62d {+14h 06m 30s}  -12.81d {-12d 48' 22"}
SUN_DIST:         73.35 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      274.30d {+18h 17m 12s}  -28.52d {-28d 31' 01"}
MOON_DIST:        53.71 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      311.35,-25.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      270.22,-58.78 [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 #5760
M. Stamatikos (NASA/ORAU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), S. Campana (INAF-OAB), M. M. Chester (PSU), G. Cusumano (INAF-IASFPA), N. Gehrels (NASA/GSFC), C. Guidorzi (Univ Bicocca&INAF-OAB), K. M. McLean (LANL/UTD), T. Mineo (INAF-IASFPA), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), S. B. Pandey (UCL-MSSL), P. Romano (Univ. Bicocca & INAF-OAB) and T. Sakamoto (NASA/ORAU) report on behalf of the Swift Team:
At 10:15:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located possible GRB 061027 (trigger=235645). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 270.812, -82.228 {18h 03m 15s, -82d 13' 39"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This is a 64-sec image trigger and as is typical the BAT lightcurve does not show any significant emission. The image peak is barely above the significance threshold for automatic detection, and therefore this may be a statistical fluctuation.
The XRT began taking data at 10:17:29 UT, 147 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image and no prompt position is available. Initial down-linked data products also show no evidence for any X-ray source in the image in ~200 s of data. This gives a very rough upper limit of 2E-12 erg/cm2/s for any source in the field of view. We note that only one long burst has had no XRT detection following a prompt slew, out of 119 long GRBs observed by XRT with prompt slews to date. Further analysis awaits the full dowloaded data products.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 151.7 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The limiting magnitude of the finding chart image is approximately 19.0. No correction has been made for the expected extinction.
GCN Circular #5761
A. Parsons (GSFC), 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), D. Palmer (LANL), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), D.N. Burrows (PSU), V. Mangano, T. Mineo, G. Cusumano, B. Sbarufatti (INAF-IASFPA), S.B. Pandey (UCL-MSSL) on behalf of the Swift team:
Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT possible GRB 061027 (trigger #235645) (Stamatikos, et al., GCN Circ. 5760). The BAT ground-calculated position is RA,Dec = 270.992, -82.239 deg {18h 3m 58.1s, -82d 14' 19.9"} (J2000) +- 3.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 68%.
The event starts ~100 sec before the trigger and extends to ~T+70 sec. All of the emission is in the 15-50 keV band -- there is nothing above 50 keV. Because this event is very weak, we had to use 10-sec binning for the lightcurve. There appears to be no statistically significant structure in the lightcurve. T90 (15-350 keV) is 150 +- 20 sec (estimated error including systematics).
The time-averaged spectrum from T-100 to T+70 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.91 +- 0.48. The fluence in the 15-150 keV band is 4.7 +- 1.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.00 sec in the 15-150 keV band is 0.08 +- 0.02 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
Given the very low flux, the somewhat low detection significance, and the soft spectrum for this event, we can not determine if this is a long soft GRB or some hard x-ray transient from an unknown source. The position in galactic coordinates is l, b = 311, -25, so the source is off the plane but still possibly a galactic transient. We can not rule out the possibility that this event is due to a chance statistical fluctuation in the image and rate domains.
XRT observed the field of GRB061027 for 1.5 ks in PC mode starting at 10:17:37 UT (152 seconds after the BAT trigger). No source has been detected within the BAT error circle down to a limiting flux of 3.6e-13 erg cm^-2 s^-1. This is unusually low for a GRB afterglow at this point after a trigger, and suggests that this event may be either an unusual GRB or due to some other source, either transient or noise.
UVOT began observing the field around 133 sec after the BAT trigger. No afterglow candidate is found within the BAT error circle. The 3-sigma upper limit of the UVOT filters are given below.
```
Filter    T_start   T_stop   Exposure(s)   Mag (3-sig Upper limit)
V         133       6777     805           20.41
B         735       6163     206           20.40
U         711       5958     216           20.04
W1        687       5753     235           19.96
M2        663       6839     292           19.95
W2        763       6573     216           20.29
White     152       6367     501           21.10
```
GCN Circular #5788
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 061027 detected by SWIFT (trigger 235645) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
This trigger was long, had no high-energy emission, it was detected by "image trigger" (Stamatikos et al. GCNC 5760) and UVOT limiting mag. is V=20.4 until two hours after the burst. This is a good high-redshift candidate, so we shot a series of filtered R and I exposures centered on the BAT refined position (Parsons et al. GCNC 5761).
The observations started 14.0h after the GRB trigger. The elevation of the field decreased from from 33 degrees above horizon and weather conditions were excellent. We obtained a second set of exposures on 2006 nov. 7 for comparison and to extract fading sources.
The date of trigger : t0 = 2006-10-27T10:15:02.304
We co-added series of filtered exposures, and we do not detect any OT:
t0+14.0h to t0+18.6h : R > 20.0 and I > 18.9
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=311.3409 lat=-25.2566 and the galactic extinction in R band is 0.1 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
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Jochen Greiner, last update: 08-Nov-2006 [Disclaimer]