Gamma-ray Burst 170906B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 00:58:00 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     770958,   Seg_Num: 0
GRB_RA:          232.221d {+15h 28m 53s} (J2000),
                 232.490d {+15h 29m 58s} (current),
                 231.463d {+15h 25m 51s} (1950)
GRB_DEC:         -28.251d {-28d 15' 03"} (J2000),
                 -28.311d {-28d 18' 39"} (current),
                 -28.079d {-28d 04' 44"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       7544 [cnts]    Image_Peak=1020 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       23595 [cnts]
BKG_TIME:        3332.35 SOD {00:55:32.35} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18002 TJD;   249 DOY;   17/09/06
GRB_TIME:        3345.73 SOD {00:55:45.73} UT
GRB_PHI:          13.84 [deg]
GRB_THETA:        28.94 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     77.03 [sigma]
IMAGE_SIGNIF:    20.76 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +7  +0  +0 -28  +0 
SUN_POSTN:       164.93d {+10h 59m 42s}   +6.43d {+06d 25' 54"}
SUN_DIST:         73.69 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.62d {+22h 50m 29s}   -8.87d {-08d 51' 53"}
MOON_DIST:       103.08 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.29, 22.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      236.88, -9.05 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 256.45,-11.69 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(5.0<100sec) coincident with the FERMI_GBM event (trignum=526352145).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 06 Sep 17 00:56:05 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     526352145
GRB_RA:          238.817d {+15h 55m 16s} (J2000),
                 239.092d {+15h 56m 22s} (current),
                 238.041d {+15h 52m 10s} (1950)
GRB_DEC:         -29.767d {-29d 46' 00"} (J2000),
                 -29.817d {-29d 49' 02"} (current),
                 -29.621d {-29d 37' 14"} (1950)
GRB_ERROR:       11.75 [deg radius, statistical plus systematic]
GRB_INTEN:       174 [cnts/sec]
DATA_SIGNIF:     8.00 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18002 TJD;   249 DOY;   17/09/06
GRB_TIME:        3340.85 SOD {00:55:40.85} UT
GRB_PHI:         267.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.96
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      61%  GRB
2nd_MOST_LIKELY:  17%  SGR_1806n20
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       164.92d {+10h 59m 42s}   +6.43d {+06d 25' 55"}
SUN_DIST:         79.66 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      342.60d {+22h 50m 24s}   -8.87d {-08d 52' 12"}
MOON_DIST:        97.10 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      343.96, 18.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.91, -9.21 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170906039/quicklook/glg_lc_medres34_bn170906039.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 136.17,-16.28 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 06 Sep 17 00:56:14 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     526352145
GRB_RA:          234.617d {+15h 38m 28s} (J2000),
                 234.896d {+15h 39m 35s} (current),
                 233.829d {+15h 35m 19s} (1950)
GRB_DEC:         -33.167d {-33d 10' 00"} (J2000),
                 -33.223d {-33d 13' 24"} (current),
                 -33.004d {-33d 00' 13"} (1950)
GRB_ERROR:       6.97 [deg radius, statistical plus systematic]
GRB_INTEN:       412 [cnts/sec]
DATA_SIGNIF:     18.10 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18002 TJD;   249 DOY;   17/09/06
GRB_TIME:        3340.85 SOD {00:55:40.85} UT
GRB_PHI:         268.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.48
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Distant Particles
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       164.93d {+10h 59m 42s}   +6.43d {+06d 25' 55"}
SUN_DIST:         77.10 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      342.60d {+22h 50m 25s}   -8.87d {-08d 52' 10"}
MOON_DIST:        99.61 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      338.78, 17.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      240.12,-13.32 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170906039/quicklook/glg_lc_medres34_bn170906039.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 136.17,-16.28 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 06 Sep 17 00:56:18 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     526352145
GRB_RA:          241.530d {+16h 06m 07s} (J2000),
                 241.802d {+16h 07m 13s} (current),
                 240.762d {+16h 03m 03s} (1950)
GRB_DEC:         -27.740d {-27d 44' 23"} (J2000),
                 -27.787d {-27d 47' 11"} (current),
                 -27.606d {-27d 36' 19"} (1950)
GRB_ERROR:       4.04 [deg radius, statistical only]
DATA_SIGNIF:     9.90 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        18002 TJD;   249 DOY;   17/09/06
GRB_TIME:        3340.85 SOD {00:55:40.85} UT
GRB_PHI:         266.00 [deg]
GRB_THETA:        58.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       164.93d {+10h 59m 42s}   +6.43d {+06d 25' 55"}
SUN_DIST:         81.53 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      342.60d {+22h 50m 25s}   -8.87d {-08d 52' 10"}
MOON_DIST:        95.28 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      347.24, 17.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      244.86, -6.75 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170906039/quicklook/glg_lc_medres34_bn170906039.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_526352145.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 00:58:46 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.203d {+15h 28m 49s} (J2000)
POINT_DEC:       -28.250d {-28d 14' 59"} (J2000)
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3424.28 SOD {00:57:04.28} UT,   78.6 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:01:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.203d {+15h 28m 49s} (J2000)
POINT_DEC:       -28.250d {-28d 14' 58"} (J2000)
POINT_ROLL:      287.014d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3426.52 SOD {00:57:06.52} UT,   80.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.683
N_STARS:         41
X_OFFSET:        388 [pixels]
Y_OFFSET:        655 [pixels]
X_MAX:           1347 [pixels]
Y_MAX:           1614 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00770958000msufc0080.fits
SUN_POSTN:       164.93d {+10h 59m 43s}   +6.43d {+06d 25' 50"}
SUN_DIST:         73.68 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.65d {+22h 50m 37s}   -8.85d {-08d 51' 16"}
MOON_DIST:       103.13 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.28, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:02:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.203d {+15h 28m 49s} (J2000)
POINT_DEC:       -28.250d {-28d 14' 58"} (J2000)
POINT_ROLL:      287.014d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3426.52 SOD {00:57:06.52} UT,   80.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.683
N_STARS:         41
X_OFFSET:        388 [pixels]
Y_OFFSET:        655 [pixels]
X_MAX:           1347 [pixels]
Y_MAX:           1614 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00770958000msufc0080.fits
SUN_POSTN:       164.93d {+10h 59m 43s}   +6.43d {+06d 25' 50"}
SUN_DIST:         73.68 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.66d {+22h 50m 37s}   -8.85d {-08d 51' 13"}
MOON_DIST:       103.13 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.28, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:02:28 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     770958,   Seg_Num: 0
GRB_RA:          232.2039d {+15h 28m 48.93s} (J2000),
                 232.4724d {+15h 29m 53.36s} (current),
                 231.4462d {+15h 25m 47.08s} (1950)
GRB_DEC:         -28.2551d {-28d 15' 18.3"} (J2000),
                 -28.3152d {-28d 18' 54.8"} (current),
                 -28.0830d {-28d 04' 58.8"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3462.00 SOD {00:57:42.00} UT,   116.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       164.93d {+10h 59m 43s}   +6.43d {+06d 25' 49"}
SUN_DIST:         73.68 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.66d {+22h 50m 38s}   -8.85d {-08d 51' 09"}
MOON_DIST:       103.13 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:03:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.203d {+15h 28m 49s} (J2000)
POINT_DEC:       -28.250d {-28d 14' 58"} (J2000)
ROLL:            287.014d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3426.52 SOD {00:57:06.52} UT,   80.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     526352246
X_OFFSET:        707 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       867
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00770958000msuni0100.fits
SUN_POSTN:       164.93d {+10h 59m 43s}   +6.43d {+06d 25' 49"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.67d {+22h 50m 40s}   -8.85d {-08d 51' 01"}
MOON_DIST:       103.14 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.28, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:03:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.203d {+15h 28m 49s} (J2000)
POINT_DEC:       -28.250d {-28d 14' 58"} (J2000)
ROLL:            287.014d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3426.52 SOD {00:57:06.52} UT,   80.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     526352246
X_OFFSET:        707 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       867
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00770958000msuni0100.fits
SUN_POSTN:       164.93d {+10h 59m 43s}   +6.43d {+06d 25' 48"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.67d {+22h 50m 40s}   -8.85d {-08d 50' 58"}
MOON_DIST:       103.14 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.28, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:07:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
POINT_ROLL:      287.016d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3638.50 SOD {01:00:38.50} UT,   292.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.271
N_STARS:         42
X_OFFSET:        148 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1587 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    4
SL_URL:          sw00770958000msufc0292.fits
SUN_POSTN:       164.93d {+10h 59m 44s}   +6.43d {+06d 25' 45"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.70d {+22h 50m 48s}   -8.84d {-08d 50' 23"}
MOON_DIST:       103.18 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:07:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
POINT_ROLL:      287.016d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3638.50 SOD {01:00:38.50} UT,   292.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.271
N_STARS:         42
X_OFFSET:        148 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1587 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    4
SL_URL:          sw00770958000msufc0292.fits
SUN_POSTN:       164.93d {+10h 59m 44s}   +6.43d {+06d 25' 45"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.70d {+22h 50m 49s}   -8.84d {-08d 50' 21"}
MOON_DIST:       103.18 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:07:47 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     770958,   Seg_Num: 0
GRB_RA:          232.2036d {+15h 28m 48.86s} (J2000),
                 232.4721d {+15h 29m 53.29s} (current),
                 231.4459d {+15h 25m 47.01s} (1950)
GRB_DEC:         -28.2562d {-28d 15' 22.3"} (J2000),
                 -28.3163d {-28d 18' 58.8"} (current),
                 -28.0841d {-28d 05' 02.8"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3462.00 SOD {00:57:42.00} UT,   116.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       164.93d {+10h 59m 44s}   +6.43d {+06d 25' 44"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.71d {+22h 50m 49s}   -8.84d {-08d 50' 17"}
MOON_DIST:       103.18 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:08:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
ROLL:            287.016d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3638.50 SOD {01:00:38.50} UT,   292.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     526352458
X_OFFSET:        707 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       867
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00770958000msuni0312.fits
SUN_POSTN:       164.93d {+10h 59m 44s}   +6.43d {+06d 25' 44"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.71d {+22h 50m 51s}   -8.84d {-08d 50' 10"}
MOON_DIST:       103.19 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:08:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
ROLL:            287.016d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  3638.50 SOD {01:00:38.50} UT,   292.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     526352458
X_OFFSET:        707 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       867
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00770958000msuni0312.fits
SUN_POSTN:       164.93d {+10h 59m 44s}   +6.43d {+06d 25' 44"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.71d {+22h 50m 51s}   -8.84d {-08d 50' 08"}
MOON_DIST:       103.19 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:13:35 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
POINT_ROLL:      287.015d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  4217.82 SOD {01:10:17.82} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.743
N_STARS:         70
X_OFFSET:        148 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1587 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00770958000msufc0872.fits
SUN_POSTN:       164.94d {+10h 59m 45s}   +6.43d {+06d 25' 39"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.76d {+22h 51m 02s}   -8.82d {-08d 49' 21"}
MOON_DIST:       103.23 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:13:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
POINT_ROLL:      287.015d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  4217.82 SOD {01:10:17.82} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.743
N_STARS:         70
X_OFFSET:        148 [pixels]
Y_OFFSET:        415 [pixels]
X_MAX:           1587 [pixels]
Y_MAX:           1854 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00770958000msufc0872.fits
SUN_POSTN:       164.94d {+10h 59m 45s}   +6.43d {+06d 25' 39"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.76d {+22h 51m 02s}   -8.82d {-08d 49' 19"}
MOON_DIST:       103.23 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:14:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
ROLL:            287.015d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  4217.82 SOD {01:10:17.82} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     526353037
X_OFFSET:        707 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       867
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00770958000msuni0892.fits
SUN_POSTN:       164.94d {+10h 59m 45s}   +6.43d {+06d 25' 38"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.77d {+22h 51m 04s}   -8.82d {-08d 49' 08"}
MOON_DIST:       103.24 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 Sep 17 01:15:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     770958,   Seg_Num: 0
POINT_RA:        232.200d {+15h 28m 48s} (J2000)
POINT_DEC:       -28.252d {-28d 15' 06"} (J2000)
ROLL:            287.015d
IMG_START_DATE:  18002 TJD;   249 DOY;   17/09/06
IMG_START_TIME:  4217.82 SOD {01:10:17.82} UT,   872.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     526353037
X_OFFSET:        707 [pixels]
Y_OFFSET:        974 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       867
Y_GRB_POS:       1134
BINNING_INDEX:   1
IM_URL:          sw00770958000msuni0892.fits
SUN_POSTN:       164.94d {+10h 59m 45s}   +6.43d {+06d 25' 38"}
SUN_DIST:         73.67 [deg]   Sun_angle= -4.5 [hr] (East of Sun)
MOON_POSTN:      342.77d {+22h 51m 05s}   -8.82d {-08d 49' 07"}
MOON_DIST:       103.25 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      340.27, 22.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      236.86, -9.06 [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 #21822
B. Sbarufatti (PSU), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Swift Team:
At 00:55:46 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170906B (trigger=770958). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 232.221, -28.251 which is
```
   RA(J2000) = 15h 28m 53s
   Dec(J2000) = -28d 15' 03.6"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve is not immediately available for an unknown reason.
The XRT began observing the field at 00:57:04.2 UT, 78.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 232.2037, -28.2563 which is equivalent to:
```
   RA(J2000)  = 15h 28m 48.90s
   Dec(J2000) = -28d 15' 22.8"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 58 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 (1.69 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 1.1 (+1.25/-0.71) x 10^22 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 80 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.42.
Burst Advocate for this burst is B. Sbarufatti (boris.sbarufatti AT brera.inaf.it). 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 #21823
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 824 s of XRT Photon Counting mode data and 1 UVOT images for GRB 170906B, 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 = 232.20430, -28.25599 which is equivalent to:
```
RA (J2000): 15h 28m 49.03s
Dec (J2000): -28d 15' 21.6"
```
with an uncertainty of 1.8 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 #21840
R. Hamburg (UAH) and and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 00:55:40.85 UT on 06 September 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170906B (trigger 526352145 / 170906039). which was also detected by Swift (Sbarufatti et al. 2017, GCN 21822). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 53 degrees.
The GBM light curve shows a two-peaked emission with a duration (T90) of about 12 s (50-300 keV). The time-averaged spectrum from T0-0.0 s to T0+12.8 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.11 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 59 +/- 4 keV.
The event fluence (10-1000 keV) in this time interval is (2.7 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.1 s in the 10-1000 keV band is 10.3 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #21841
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), B. Sbarufatti (PSU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from the recent telemetry downlink, we report further analysis of BAT GRB 170906B (trigger #770958) (Sbarufatti et al., GCN Circ. 21822).
Because this burst occurred only 755 s after the trigger time of GRB 170906A (trigger #770957), data collection was interrupted, and as such we do not have event-by-event data during the burst. Thus most of the usual BAT data products that we usually report in the "refined analysis circular" are not available.
The BAT raw light curve shows roughly two overlapping pulses that start at ~T-11 s and ends at ~T+7 s. The two peaks occur at ~T-5 s and ~T0, respectively.
The results of the BAT analysis are available at http://gcn.gsfc.nasa.gov/notices_s/770958/BA/
GCN Circular #21845
B. Sbarufatti (PSU) reports on behalf of the Swift-XRT team:
We have analysed 831 s of XRT data for GRB 170906B (Sbarufatti et al. GCN Circ. 21822), from 63 s to 924 s after the BAT trigger. The data comprise 9 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 21823).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.63 (+0.13, -0.14).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.80 (+0.30, -0.27). The best-fitting absorption column is 7.5 (+2.8, -2.2) x 10^21 cm^-2, in excess of the Galactic value of 1.7 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.0 x 10^-11 (7.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.5 (+2.8, -2.2) x 10^21 cm^-2
Galactic foreground: 1.7 x 10^21 cm^-2
Excess significance: 4.3 sigma
Photon index:	     1.80 (+0.30, -0.27)
```
If the light curve continues to decay with a power-law decay index of 0.63, the count rate at T+24 hours will be 0.033 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-12 (2.6 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00770958.
This circular is an official product of the Swift-XRT team.
GCN Circular #21846
M. H. Siegel (PSU) and B. Sbarufatti (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170906B 81 s after the BAT trigger (Sbarufatti et al., GCN Circ. 21822). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 21823) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            81          231          147         >20.2
u_FC               293          543          246         >19.3
white               81          930          243         >20.6
v                  623          815           39         >17.5
b                  548          741           39         >18.7
u                  293          716          265         >19.3
w1                 672          865           39         >18.4
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.42 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 07-Sep-2017 [Disclaimer]