Gamma-ray Burst 091109

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 04:59:00 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     375246,   Seg_Num: 0
GRB_RA:          309.265d {+20h 37m 04s} (J2000),
                 309.432d {+20h 37m 44s} (current),
                 308.413d {+20h 33m 39s} (1950)
GRB_DEC:         -44.176d {-44d 10' 34"} (J2000),
                 -44.142d {-44d 08' 29"} (current),
                 -44.351d {-44d 21' 03"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       53053 [cnts]    Image_Peak=494 [image_cnts]
TRIGGER_DUR:     16.384 [sec] 
TRIGGER_INDEX:   492     E_range: 50-350 keV
BKG_INTEN:       191666 [cnts]
BKG_TIME:        17762.75 SOD {04:56:02.75} UT
BKG_DUR:         64 [sec]
GRB_DATE:        15144 TJD;   313 DOY;   09/11/09
GRB_TIME:        17863.36 SOD {04:57:43.36} UT
GRB_PHI:         162.80 [deg]
GRB_THETA:        47.40 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.52 [sigma]
IMAGE_SIGNIF:    7.64 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +3  -2  +0  +0 -26  +0 
SUN_POSTN:       224.46d {+14h 57m 49s}  -16.89d {-16d 53' 22"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.92d {+08h 51m 41s}  +16.08d {+16d 04' 49"}
MOON_DIST:       151.78 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.46,-36.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      299.99,-24.74 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 199.32,13.01 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:00:23 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.273d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.172d {-44d 10' 19"} (J2000)
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18014.08 SOD {05:00:14.08} UT,   150.7 [sec] since BAT Trigger Time
COUNTS:          13    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:     Mon 09 Nov 09 05:01:42 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     375246,   Seg_Num: 0
GRB_RA:          309.265d {+20h 37m 04s} (J2000),
                 309.432d {+20h 37m 44s} (current),
                 308.413d {+20h 33m 39s} (1950)
GRB_DEC:         -44.176d {-44d 10' 34"} (J2000),
                 -44.142d {-44d 08' 29"} (current),
                 -44.351d {-44d 21' 03"} (1950)
GRB_DATE:        15144 TJD;   313 DOY;   09/11/09
GRB_TIME:        17863.36 SOD {04:57:43.36} UT
TRIGGER_INDEX:   492
GRB_PHI:         162.80 [deg]
GRB_THETA:        47.40 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     16.384 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.52 [sigma]
IMAGE_SIGNIF:    7.64 [sigma]
LC_URL:          sw00375246000msb.lc
SUN_POSTN:       224.46d {+14h 57m 50s}  -16.89d {-16d 53' 24"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.95d {+08h 51m 48s}  +16.07d {+16d 04' 15"}
MOON_DIST:       151.77 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.46,-36.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      299.99,-24.74 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 199.32,13.01 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:03:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 12"} (J2000)
POINT_ROLL:      261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18019.21 SOD {05:00:19.21} UT,   155.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.227
N_STARS:         88
X_OFFSET:        488 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00375246000msufc0155.fits
SUN_POSTN:       224.46d {+14h 57m 50s}  -16.89d {-16d 53' 25"}
SUN_DIST:         74.79 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.96d {+08h 51m 51s}  +16.07d {+16d 03' 55"}
MOON_DIST:       151.77 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:03:20 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 12"} (J2000)
POINT_ROLL:      261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18019.21 SOD {05:00:19.21} UT,   155.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.227
N_STARS:         88
X_OFFSET:        488 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00375246000msufc0155.fits
SUN_POSTN:       224.46d {+14h 57m 50s}  -16.89d {-16d 53' 25"}
SUN_DIST:         74.79 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.96d {+08h 51m 51s}  +16.07d {+16d 03' 55"}
MOON_DIST:       151.77 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:03:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     375246,   Seg_Num: 0
GRB_RA:          309.2585d {+20h 37m 02.04s} (J2000),
                 309.4260d {+20h 37m 42.22s} (current),
                 308.4067d {+20h 33m 37.61s} (1950)
GRB_DEC:         -44.1585d {-44d 09' 30.5"} (J2000),
                 -44.1237d {-44d 07' 25.3"} (current),
                 -44.3331d {-44d 19' 59.0"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18041.00 SOD {05:00:41.00} UT,   177.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       224.46d {+14h 57m 50s}  -16.89d {-16d 53' 25"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.97d {+08h 51m 53s}  +16.06d {+16d 03' 48"}
MOON_DIST:       151.78 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.49,-36.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      299.99,-24.72 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:03:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 12"} (J2000)
POINT_ROLL:      261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18019.21 SOD {05:00:19.21} UT,   155.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.227
N_STARS:         88
X_OFFSET:        488 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00375246000msufc0155.fits
SUN_POSTN:       224.46d {+14h 57m 50s}  -16.89d {-16d 53' 25"}
SUN_DIST:         74.79 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.97d {+08h 51m 53s}  +16.06d {+16d 03' 48"}
MOON_DIST:       151.77 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [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:     Mon 09 Nov 09 05:04:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 12"} (J2000)
ROLL:            261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18019.21 SOD {05:00:19.21} UT,   155.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     279435624
X_OFFSET:        807 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00375246000msuni0161.fits
SUN_POSTN:       224.46d {+14h 57m 50s}  -16.89d {-16d 53' 26"}
SUN_DIST:         74.79 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.98d {+08h 51m 54s}  +16.06d {+16d 03' 38"}
MOON_DIST:       151.77 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [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:     Mon 09 Nov 09 05:05:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 12"} (J2000)
ROLL:            261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18019.21 SOD {05:00:19.21} UT,   155.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     279435624
X_OFFSET:        807 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00375246000msuni0161.fits
SUN_POSTN:       224.46d {+14h 57m 50s}  -16.89d {-16d 53' 26"}
SUN_DIST:         74.79 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      132.98d {+08h 51m 55s}  +16.06d {+16d 03' 32"}
MOON_DIST:       151.76 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [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:     Mon 09 Nov 09 05:10:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 13"} (J2000)
POINT_ROLL:      261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18177.24 SOD {05:02:57.24} UT,   313.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.859
N_STARS:         136
X_OFFSET:        248 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1687 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00375246000msufc0313.fits
SUN_POSTN:       224.46d {+14h 57m 51s}  -16.89d {-16d 53' 30"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      133.03d {+08h 52m 07s}  +16.04d {+16d 02' 28"}
MOON_DIST:       151.74 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:10:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 13"} (J2000)
POINT_ROLL:      261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18177.24 SOD {05:02:57.24} UT,   313.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.859
N_STARS:         136
X_OFFSET:        248 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1687 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00375246000msufc0313.fits
SUN_POSTN:       224.46d {+14h 57m 51s}  -16.89d {-16d 53' 30"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      133.03d {+08h 52m 07s}  +16.04d {+16d 02' 28"}
MOON_DIST:       151.74 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:10:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 13"} (J2000)
POINT_ROLL:      261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18177.24 SOD {05:02:57.24} UT,   313.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.859
N_STARS:         136
X_OFFSET:        248 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1687 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00375246000msufc0313.fits
SUN_POSTN:       224.46d {+14h 57m 51s}  -16.89d {-16d 53' 30"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      133.04d {+08h 52m 08s}  +16.04d {+16d 02' 21"}
MOON_DIST:       151.74 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [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:     Mon 09 Nov 09 05:11:16 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     375246,   Seg_Num: 0
GRB_RA:          309.2579d {+20h 37m 01.89s} (J2000),
                 309.4254d {+20h 37m 42.08s} (current),
                 308.4061d {+20h 33m 37.47s} (1950)
GRB_DEC:         -44.1591d {-44d 09' 32.7"} (J2000),
                 -44.1243d {-44d 07' 27.5"} (current),
                 -44.3337d {-44d 20' 01.2"} (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:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18041.00 SOD {05:00:41.00} UT,   177.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       224.46d {+14h 57m 51s}  -16.89d {-16d 53' 31"}
SUN_DIST:         74.77 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      133.04d {+08h 52m 10s}  +16.04d {+16d 02' 15"}
MOON_DIST:       151.75 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.49,-36.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      299.99,-24.72 [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

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 09 Nov 09 05:11:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 13"} (J2000)
ROLL:            261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18177.24 SOD {05:02:57.24} UT,   313.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     279435782
X_OFFSET:        807 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00375246000msuni0319.fits
SUN_POSTN:       224.46d {+14h 57m 52s}  -16.89d {-16d 53' 31"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      133.04d {+08h 52m 10s}  +16.04d {+16d 02' 11"}
MOON_DIST:       151.73 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [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:     Mon 09 Nov 09 05:11:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     375246,   Seg_Num: 0
POINT_RA:        309.271d {+20h 37m 05s} (J2000)
POINT_DEC:       -44.170d {-44d 10' 13"} (J2000)
ROLL:            261.174d
IMG_START_DATE:  15144 TJD;   313 DOY;   09/11/09
IMG_START_TIME:  18177.24 SOD {05:02:57.24} UT,   313.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     279435782
X_OFFSET:        807 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       967
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00375246000msuni0319.fits
SUN_POSTN:       224.46d {+14h 57m 52s}  -16.89d {-16d 53' 31"}
SUN_DIST:         74.78 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      133.05d {+08h 52m 11s}  +16.04d {+16d 02' 07"}
MOON_DIST:       151.73 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      356.47,-36.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      299.99,-24.73 [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 #10138
S. R. Oates (UCL-MSSL), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), C. B. Markwardt (CRESST/GSFC/UMD), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC) and L. Vetere (PSU) report on behalf of the Swift Team:
At 04:57:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 091109 (trigger=375246). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 309.265, -44.176 which is
```
   RA(J2000) = 20h 37m 04s
   Dec(J2000) = -44d 10' 34"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a spiky structure with a duration of about 25 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~20 sec after the trigger.
The XRT began observing the field at 05:00:14.1 UT, 150.7 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 309.25854, -44.15853 which is equivalent to:
```
   RA(J2000)  = 20h 37m 2.05s
   Dec(J2000) = -44d 09' 30.7"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 65 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 (2.99e+20 cm^-2, Kalberla et al. 2005), with an excess column of 3 (+1.84/-1.63) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 155 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	20:37:01.81 = 309.25755
  DEC(J2000) = -44:09:29.6  = -44.15821
```
with a 90%-confidence error radius of about 0.69 arc sec. This position is 2.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.92 with a 1-sigma error of about 0.18. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is S. R. Oates (sro AT mssl.ucl.ac.uk). 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 #10139
L.A. Antonelli, S. Covino, P. D'Avanzo, D. Fugazza, L. Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, E. Maiorano, N. Masetti, A. Melandri, E.J.A. Meurs, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V. Testa, S.D. Vergani, F. Vitali report on behalf of the REM team:
"The robotic 60-cm REM telescope located at La Silla (Chile) observed automatically the field of the GRB 091109 (Oates et al. GCN10138) starting about 77 s after the burst. We detect a faint object in the XRT error circle in our first H-band images at H~14.8 at coordinates: RA(J2000) 20:37:02.2; Dec(J2000) -44:09:30.4 with 1 arcsec error.
This message can be cited"
GCN Circular #10140
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 3018 s of XRT Photon Counting mode data and 5 UVOT images for GRB 091109, 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 = 309.25767, -44.15872 which is equivalent to:
```
RA (J2000): 20h 37m 1.84s
Dec (J2000): -44d 09' 31.4"
```
with an uncertainty of 1.7 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 #10141
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (GSFC/UMD), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 091109 (trigger #375246) (Oates, et al., GCN Circ. 10138). The BAT ground-calculated position is RA, Dec = 309.252, -44.177 deg, which is
```
   RA(J2000)  =  20h 37m 00.5s 
   Dec(J2000) = -44d 10' 36.0" 
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 19%.
The mask-weighted light curve shows a couple overlapping peaks. The first starts at ~T-15 sec, peaks at ~T+10 sec. The second (weaker) peaks at ~T+40 sec and ends at ~T+60 sec. T90 (15-350 keV) is 48 +- 17 sec (estimated error including systematics).
The time-averaged spectrum from T-0.8 to T+51.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.31 +- 0.25. The fluence in the 15-150 keV band is 1.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+8.20 sec in the 15-150 keV band is 1.3 +- 0.4 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/375246/BA/
GCN Circular #10142
C. Guidorzi (U. Ferrara), R.J. Smith, C.G. Mundell, D. Bersier, A. Melandri, Z. Cano, S. Kobayashi, C.J. Mottram, I.A. Steele (Liverpool JMU), A. Gomboc (U. Ljubljana) report on behalf of a large collaboration:
On 2009 November 9 at 09:26:10 UT the 2-m Faulkes Telescope South began observing GRB 091109 (Oates et al., GCN Circ. 10138) using the R and i' filters.
We detect the UVOT optical afterglow candidate at a position consistent with that reported by Oates et al. (but not consistent with the object reported by REM Antonelli et al., GCN Circ. 10139), with the following magnitudes:
```
Mid Time from GRB   Total Exp  Filter   Magnitude
(hours)             (s)
-----------------------------------------------------
4.74                600         i'      21.7  +- 0.3
5.29                600         R       21.95 +- 0.25
-----------------------------------------------------
```
Magnitudes have been calibrated from the nearby USNOB-1 star 20:37:02.508, -44:09:33.68, using R2=17.52 and I=17.61.
GCN Circular #10143
S. R. Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began observerving the field of GRB 091109 156s after the BAT trigger (Oates et al., GCN Circ. 10138). We detect the optical afterglow in the white filter only, which faded rapidly. The refined UVOT position is:
```
     RA (J2000)  20:37:01.80
    Dec (J2000) -44: 9:29.6
```
with an estimated uncertainty of 0.7 arcsec (radius, 90% confidence). This position is consistent with the XRT refined position (Beardmore et al., GCN Circ 10140).
Preliminary magnitudes and the 3 sigma upper limits are reported below.
```
Filter    T_start(s)  T_stop(s)  Exposure      Mag  Err
###########################################################
white        156        306         147     19.88 +\- 0.14
white	     5371       5571        197        > 21.26
v	     4345       5981        393        > 19.94
b	     5166       5365        197        > 20.49
u	     314        6572        615        > 20.97
uvw1	     4755       6392        393        > 20.59
uvm2	     4550       6186        393        > 20.46
uvw2	     4140       5777        393        > 20.68
###########################################################
```
The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 0.03 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627).
GCN Circular #10144
A. de Ugarte Postigo (INAF-OAB), A.J. Castro-Tirado, M. Jelinek (IAA-CSIC), P. Kubanek (IPL UV, IAA-CSIC), J. Gorosabel, R. Cunniffe, S. Guziy (IAA-CSIC), P. Yock (Auckland Univ.), W.H. Allen (Vintage Lane Obs.), I. Bond (Massey Univ.), G. Christie (Stardome Obs.), report on behalf of a larger collaboration:
We have observed the field of GRB 091109 (Oates et al. GCN 10138) using the 0.6 Yock-Allen robotic telescope (BOOTES-3) located in Bleinheim, New Zealand. Due to bad weather conditions, observations did not start until 11:03 UT (6.1h after the burst). A combination of the first 30x60s unfiltered exposures does not show any source at the UVOT postion down to a 3-sigma limiting magnitude of R~20.0, consistent with the limits given by UVOT (Oates et al. GCN 10143) and the fainter detection by Faulkes Telescope South (Guidorzi et al. GCN 10142).
Further observations are ongoing.
GCN Circular #10145
A. P. Beardmore (U. Leicester) and S. R. Oates (UCL-MSSL) report on behalf of the Swift-XRT team:
We have analysed 7.9 ks of Swift-XRT data for GRB 091109 (Oates et al. GCN Circ. 10138), from 154 s to 18.1 ks after the BAT trigger. The data span four orbits, comprising 37 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 10140).
The light curve can be modelled by a broken power-law with an initial decay slope of 2.9 +0.5 -0.4, breaking at T+358 s to a shallower decay of 0.86 +0.07 -0.08.
A spectrum formed from the PC mode data (from 175 s to 18.1 ks after the trigger) can be fitted with an absorbed power-law, giving a photon index of 2.10 +/- 0.19. The best-fitting absorption column is (9.9 +2.1 -4.4) x 10^20 cm^-2, in excess of the Galactic value of 3.0 x 10^20 cm^-2 (Kalberla et al. 2005) in the direction of the burst. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.8 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 0.86, the count rate at T+24 hours will be 4.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-13 (2.3 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00375246.
This circular is an official product of the Swift-XRT team.
GCN Circular #10147
L.A. Antonelli, S. Covino, P. D'Avanzo, report on behalf of the REM team:
"We have to correct the position of the object reported in our previous GCN 10139: due to a typo the R.A. position of the putative NIR afterglow of GRB091109 reported is RA(J2000) 20:37:02.02 instead of RA(J2000) 20:37:02.2.
However, we note that the correct position is still about 2" far away from the UVOT position (Oates, GCN 10143). The observed source in the REM H band early images is very faint and close to the detection limit of our images. So due to the misplacement with the UVOT position the observed object may be a background fluctuation not related to GRB091109. A detailed analysis is in progress."
GCN Circular #10152
C. B. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 091109 (trigger #375409) (NAME, et al., GCN Circ. xxxx). The BAT ground-calculated position is RA, Dec = 112.750, -54.092 deg which is
```
    RA(J2000)  =  07h 30m 59.9s
    Dec(J2000) = -54d 05' 30.6"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 76%.
The mask-weighted light curve shows a single symmetrical peak of duration 0.32 seconds. There is no sign of extended emission. T90 (15-350 keV) is 0.3 +- 0.03 sec (estimated error including systematics).
The time-averaged spectrum from T-0.0 to T+0.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.71 +- 0.13. The fluence in the 15-150 keV band is 1.9 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.33 sec in the 15-150 keV band is 5.4 +- 0.4 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/375409/BA/
GCN Circular #10158
P. Afonso, T. Kruehler, A. Rau, and J. Greiner (all MPE Garching) report on behalf of the GROND team:
GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile), observed the field of GRB 091109A (Oates et al., GCN #10138) simultaneously in the g'r'i'z'JHK bands.
Observations were done under clear sky conditions, starting on Nov 10 at 00:07 UTC, 19.1 h after the burst and lasted for 1.8 hours.
In stacked images corresponding to a total integration time of 60 min in JHK and 75 min in g'r'i'z', we detect the optical afterglow (Oates et al., GCN #10138, Guidorzi et. al, GCN #10142) in the g'r'i'z' bands and obtain the following preliminary magnitudes and upper limits (all in the AB system):
```
g' = 24.5 +/- 0.1
r' = 23.6 +/- 0.1
i' = 23.4 +/- 0.1
z' = 23.3 +/- 0.2
J > 22.2
H > 21.8
K > 21.2
```
which were derived using the GROND zero points and 2MASS catalog field stars as reference. No correction has been made for the expected extinction corresponding to a reddening of E(B-V) = 0.03 mag in the direction of the burst (Schlegel et al. 1998).
Associating the blue g'-r' color with Lyman-alpha absorption in the host of the GRB, we obtain a photometric redshift of z = 3.5 +/- 0.4 assuming no intrinsic dust.
In addition, we triggered VLT/FORS2 spectroscopy, that started Nov 10 at 02:23 UTC, 21.5 h post-burst. Two integrations of 1800 s each at a mean airmass of 2.1 were obtained using the 600RI grism that covers the wavelength range from 5300 to 8700 A. In the low S/N spectrum we find a tentative ~60A EW broad absorption feature around a wavelength of 5700A. If associated with Lyman-alpha absorption, the corresponding redshift of ~3.5 would be in agreement with the GROND photo-z.
We note, however, that all observations are also consistent with a host galaxy at a redshift of z ~ 0.44. Given the absence of information about a possible host galaxy contribution we cannot distinguish these two possibilities at this point.
We thank A. Smette and P. Lynam at Paranal for excellent support.
GCN Report 258.1
GCN_Report 258.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_258_1.pdf by S.R. Oates at MSSL-UCL titled: "Swift Observations on GRB 091109A"
GCN Circular #10246
GRB 091109A: GROND confirmation of redshift z = 3.5
P. Afonso, T. Kruehler, A. Rau, and J. Greiner (all MPE Garching) report on behalf of the GROND team:
GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile), reobserved the field of GRB 091109A (Oates et al., GCN #10138) simultaneously in the g'r'i'z'JHK bands.
Observations started 2009-11-20 00:42, 10.8 days after the trigger and lasted for an effective exposure of 75 min in g'r'i'z' and 60 min in JHK.
At the position of the optical afterglow (Guidorzi et al. GCN#10142, Oates GCN#10143, Afonso et al., GCN #10158) we do not detect any source down to a limiting magnitude of r' > 25.1.
Comparing with the brightness of r' = 23.6 +- 0.1 mag (AB) reported for the 1st epoch (Afonso et al., GCN #10158), the last imaging clearly shows a fading of more than 1.5 magnitudes. The 1st epoch was hence dominated by afterglow light, favoring a redshift of around z = 3.5 +/- 0.4.
A thorough analysis of the VLT data (GCN # 10158) was limited by the very low S/N of the optical spectrum and does not yield more precise redshift constraints.
GCN Circular #10350
Arne Rau (MPE Garching), Johan Fynbo (DARK), and Jochen Greiner (MPE Garching):
"We report on additional analysis of our VLT/FORS2 spectrum of the optical afterglow of GRB 091109A (Oates et al., GCN #10138, Guidorzi et al. GCN#10142, Oates GCN#10143, Afonso et al., GCN #10158 ).
A careful search revealed absorption lines at 6227, 6308, and 6321 Angstroem which we identify with SiII and the CIV doublet a common redshift of z=3.076 +/- 0.002. Lyman-alpha absorption at this redshift is located shortwards of the blue wavelength cut-off and the earlier reported tentative detection at 5700A (Afonso et al., GCN #10158) is not confirmed."

Back to JG's homepage

Jochen Greiner, last update: 04-Dec-2009 [Disclaimer]