Gamma-ray Burst 171123A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Nov 17 14:15:19 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     791922,   Seg_Num: 0
GRB_RA:          186.190d {+12h 24m 46s} (J2000),
                 186.413d {+12h 25m 39s} (current),
                 185.568d {+12h 22m 16s} (1950)
GRB_DEC:         +32.531d {+32d 31' 51"} (J2000),
                 +32.432d {+32d 25' 55"} (current),
                 +32.808d {+32d 48' 28"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5559 [cnts]    Image_Peak=215 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   473     E_range: 25-100 keV
BKG_INTEN:       55854 [cnts]
BKG_TIME:        51251.95 SOD {14:14:11.95} UT
BKG_DUR:         24 [sec]
GRB_DATE:        18080 TJD;   327 DOY;   17/11/23
GRB_TIME:        51287.60 SOD {14:14:47.60} UT
GRB_PHI:         -143.01 [deg]
GRB_THETA:        22.19 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.58 [sigma]
IMAGE_SIGNIF:    7.65 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +0 -28  +0 
SUN_POSTN:       239.36d {+15h 57m 27s}  -20.45d {-20d 27' 16"}
SUN_DIST:         73.20 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.83d {+19h 55m 20s}  -19.01d {-19d 00' 33"}
MOON_DIST:       118.62 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.27, 82.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      171.15, 31.97 [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 = 195.93,4.68 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Nov 17 14:16:22 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.180d {+12h 24m 43s} (J2000)
POINT_DEC:       +32.540d {+32d 32' 24"} (J2000)
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51377.82 SOD {14:16:17.82} UT,   90.2 [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:     Thu 23 Nov 17 14:18:36 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     791922,   Seg_Num: 0
GRB_RA:          186.190d {+12h 24m 46s} (J2000),
                 186.413d {+12h 25m 39s} (current),
                 185.568d {+12h 22m 16s} (1950)
GRB_DEC:         +32.531d {+32d 31' 51"} (J2000),
                 +32.432d {+32d 25' 55"} (current),
                 +32.808d {+32d 48' 28"} (1950)
GRB_DATE:        18080 TJD;   327 DOY;   17/11/23
GRB_TIME:        51287.60 SOD {14:14:47.60} UT
TRIGGER_INDEX:   473
GRB_PHI:         -143.01 [deg]
GRB_THETA:        22.19 [deg]
DELTA_TIME:      -43.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.58 [sigma]
IMAGE_SIGNIF:    7.65 [sigma]
LC_URL:          sw00791922000msb.lc
SUN_POSTN:       239.37d {+15h 57m 28s}  -20.46d {-20d 27' 18"}
SUN_DIST:         73.20 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.86d {+19h 55m 26s}  -19.01d {-19d 00' 22"}
MOON_DIST:       118.64 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.27, 82.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      171.15, 31.97 [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 = 195.93,4.68 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Nov 17 14:19:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.180d {+12h 24m 43s} (J2000)
POINT_DEC:       +32.540d {+32d 32' 23"} (J2000)
POINT_ROLL:      128.477d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51381.14 SOD {14:16:21.14} UT,   93.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.285
N_STARS:         16
X_OFFSET:        563 [pixels]
Y_OFFSET:        502 [pixels]
X_MAX:           1522 [pixels]
Y_MAX:           1461 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00791922000msufc0093.fits
SUN_POSTN:       239.37d {+15h 57m 28s}  -20.46d {-20d 27' 19"}
SUN_DIST:         73.21 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.87d {+19h 55m 28s}  -19.01d {-19d 00' 19"}
MOON_DIST:       118.66 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.27, 82.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.14, 31.98 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Nov 17 14:19:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.180d {+12h 24m 43s} (J2000)
POINT_DEC:       +32.540d {+32d 32' 23"} (J2000)
POINT_ROLL:      128.477d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51381.14 SOD {14:16:21.14} UT,   93.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.285
N_STARS:         16
X_OFFSET:        563 [pixels]
Y_OFFSET:        502 [pixels]
X_MAX:           1522 [pixels]
Y_MAX:           1461 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00791922000msufc0093.fits
SUN_POSTN:       239.37d {+15h 57m 28s}  -20.46d {-20d 27' 19"}
SUN_DIST:         73.21 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.87d {+19h 55m 29s}  -19.01d {-19d 00' 18"}
MOON_DIST:       118.66 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.27, 82.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.14, 31.98 [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:     Thu 23 Nov 17 14:20:49 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.180d {+12h 24m 43s} (J2000)
POINT_DEC:       +32.540d {+32d 32' 23"} (J2000)
ROLL:            128.477d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51381.14 SOD {14:16:21.14} UT,   93.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     533139401
X_OFFSET:        882 [pixels]
Y_OFFSET:        821 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       981
BINNING_INDEX:   1
IM_URL:          sw00791922000msuni0114.fits
SUN_POSTN:       239.37d {+15h 57m 28s}  -20.46d {-20d 27' 19"}
SUN_DIST:         73.22 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.88d {+19h 55m 31s}  -19.00d {-19d 00' 15"}
MOON_DIST:       118.67 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.27, 82.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.14, 31.98 [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:     Thu 23 Nov 17 14:20:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.180d {+12h 24m 43s} (J2000)
POINT_DEC:       +32.540d {+32d 32' 23"} (J2000)
ROLL:            128.477d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51381.14 SOD {14:16:21.14} UT,   93.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     533139401
X_OFFSET:        882 [pixels]
Y_OFFSET:        821 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       981
BINNING_INDEX:   1
IM_URL:          sw00791922000msuni0114.fits
SUN_POSTN:       239.37d {+15h 57m 28s}  -20.46d {-20d 27' 19"}
SUN_DIST:         73.22 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.88d {+19h 55m 31s}  -19.00d {-19d 00' 14"}
MOON_DIST:       118.67 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.27, 82.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.14, 31.98 [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:     Thu 23 Nov 17 14:27:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
POINT_ROLL:      128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51595.21 SOD {14:19:55.21} UT,   307.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.580
N_STARS:         17
X_OFFSET:        323 [pixels]
Y_OFFSET:        262 [pixels]
X_MAX:           1762 [pixels]
Y_MAX:           1701 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00791922000msufc0307.fits
SUN_POSTN:       239.37d {+15h 57m 30s}  -20.46d {-20d 27' 23"}
SUN_DIST:         73.22 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.94d {+19h 55m 45s}  -19.00d {-18d 59' 52"}
MOON_DIST:       118.72 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Nov 17 14:28:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
POINT_ROLL:      128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51595.21 SOD {14:19:55.21} UT,   307.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.580
N_STARS:         17
X_OFFSET:        323 [pixels]
Y_OFFSET:        262 [pixels]
X_MAX:           1762 [pixels]
Y_MAX:           1701 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00791922000msufc0307.fits
SUN_POSTN:       239.37d {+15h 57m 30s}  -20.46d {-20d 27' 23"}
SUN_DIST:         73.22 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.94d {+19h 55m 46s}  -19.00d {-18d 59' 51"}
MOON_DIST:       118.72 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [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:     Thu 23 Nov 17 14:29:07 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     791922,   Seg_Num: 0
GRB_RA:          186.2420d {+12h 24m 58.07s} (J2000),
                 186.4643d {+12h 25m 51.42s} (current),
                 185.6199d {+12h 22m 28.77s} (1950)
GRB_DEC:         +32.5031d {+32d 30' 11.1"} (J2000),
                 +32.4041d {+32d 24' 14.7"} (current),
                 +32.7800d {+32d 46' 48.0"} (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:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51386.00 SOD {14:16:26.00} UT,   98.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       239.37d {+15h 57m 30s}  -20.46d {-20d 27' 24"}
SUN_DIST:         73.16 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.95d {+19h 55m 48s}  -19.00d {-18d 59' 47"}
MOON_DIST:       118.67 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.21, 82.14 [deg] galactic lon,lat of the burst
ECL_COORDS:      171.21, 31.97 [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:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Nov 17 14:29:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
ROLL:            128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51595.21 SOD {14:19:55.21} UT,   307.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     533139615
X_OFFSET:        882 [pixels]
Y_OFFSET:        821 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       981
BINNING_INDEX:   1
IM_URL:          sw00791922000msuni0328.fits
SUN_POSTN:       239.37d {+15h 57m 30s}  -20.46d {-20d 27' 24"}
SUN_DIST:         73.22 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.95d {+19h 55m 48s}  -19.00d {-18d 59' 47"}
MOON_DIST:       118.73 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [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:     Thu 23 Nov 17 14:29:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
ROLL:            128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  51595.21 SOD {14:19:55.21} UT,   307.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     533139615
X_OFFSET:        882 [pixels]
Y_OFFSET:        821 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       981
BINNING_INDEX:   1
IM_URL:          sw00791922000msuni0328.fits
SUN_POSTN:       239.37d {+15h 57m 30s}  -20.46d {-20d 27' 24"}
SUN_DIST:         73.22 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      298.95d {+19h 55m 49s}  -19.00d {-18d 59' 47"}
MOON_DIST:       118.73 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [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:     Thu 23 Nov 17 14:47:40 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
POINT_ROLL:      128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  52150.42 SOD {14:29:10.42} UT,   862.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.334
N_STARS:         19
X_OFFSET:        323 [pixels]
Y_OFFSET:        262 [pixels]
X_MAX:           1762 [pixels]
Y_MAX:           1701 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00791922000msufc0862.fits
SUN_POSTN:       239.39d {+15h 57m 33s}  -20.46d {-20d 27' 33"}
SUN_DIST:         73.23 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      299.11d {+19h 56m 27s}  -18.98d {-18d 58' 46"}
MOON_DIST:       118.86 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 23 Nov 17 14:47:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
POINT_ROLL:      128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  52150.42 SOD {14:29:10.42} UT,   862.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.334
N_STARS:         19
X_OFFSET:        323 [pixels]
Y_OFFSET:        262 [pixels]
X_MAX:           1762 [pixels]
Y_MAX:           1701 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00791922000msufc0862.fits
SUN_POSTN:       239.39d {+15h 57m 33s}  -20.46d {-20d 27' 33"}
SUN_DIST:         73.23 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      299.11d {+19h 56m 27s}  -18.98d {-18d 58' 45"}
MOON_DIST:       118.86 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [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:     Thu 23 Nov 17 14:49:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
ROLL:            128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  52150.42 SOD {14:29:10.42} UT,   862.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     533140170
X_OFFSET:        882 [pixels]
Y_OFFSET:        821 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       981
BINNING_INDEX:   1
IM_URL:          sw00791922000msuni0883.fits
SUN_POSTN:       239.39d {+15h 57m 33s}  -20.46d {-20d 27' 34"}
SUN_DIST:         73.23 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      299.12d {+19h 56m 30s}  -18.98d {-18d 58' 41"}
MOON_DIST:       118.86 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [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:     Thu 23 Nov 17 14:49:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     791922,   Seg_Num: 0
POINT_RA:        186.177d {+12h 24m 42s} (J2000)
POINT_DEC:       +32.539d {+32d 32' 21"} (J2000)
ROLL:            128.475d
IMG_START_DATE:  18080 TJD;   327 DOY;   17/11/23
IMG_START_TIME:  52150.42 SOD {14:29:10.42} UT,   862.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     533140170
X_OFFSET:        882 [pixels]
Y_OFFSET:        821 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1042
Y_GRB_POS:       981
BINNING_INDEX:   1
IM_URL:          sw00791922000msuni0883.fits
SUN_POSTN:       239.39d {+15h 57m 33s}  -20.46d {-20d 27' 34"}
SUN_DIST:         73.23 [deg]   Sun_angle= 3.5 [hr] (West of Sun)
MOON_POSTN:      299.13d {+19h 56m 30s}  -18.98d {-18d 58' 41"}
MOON_DIST:       118.87 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      168.28, 82.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.13, 31.98 [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 #22148
P. A. Evans (U Leicester), D. N. Burrows (PSU), A. Deich (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Swift Team:
At 14:14:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 171123A (trigger=791922). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 186.190, +32.531 which is
```
   RA(J2000) = 12h 24m 46s
   Dec(J2000) = +32d 31' 51"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 40 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 14:16:17.8 UT, 90.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued possible X-ray source with an enhanced position: RA, Dec 186.2425, 32.5032 which is equivalent to:
```
   RA(J2000)  = 12h 24m 58.19s
   Dec(J2000) = +32d 30' 11.4"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 188 arcseconds from the BAT onboard position, just outside the BAT error circle. This possible source is weak and at the edge of the region of the XRT which is promptly downlinked; we are not completely certain that this is an astrophysical object. We are awaiting the full dataset to confirm the nature of this source.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.90 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 9.4 (+9.50/-2.54) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 93 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 none of the XRT error circle. 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 0.02.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.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 #22150
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1128 s of XRT Photon Counting mode data and 1 UVOT images for GRB 171123A, 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 = 186.24641, +32.50104 which is equivalent to:
```
RA (J2000): 12h 24m 59.14s
Dec (J2000): +32d 30' 03.7"
```
with an uncertainty of 1.9 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 #22151
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
We have now received the full dataset from the early Swift-XRT observations of GRB 171123A (Evans et al. GCN Circ. 22148). In these data, the afterglow is clearly detected, and the light curve shows an initial decay and plateau, typical of GRB afterglows. The best position currently available was given by Goad et al. (GCN Circ. 22150). This position is ~15 arcsec from that reported in GCN 22148. This is because the object lay ~14 arcsec outside the field of view of the promptly-available XRT data, so only the edges of the PSF were available for source localisation.
As ever, the automated XRT analysis can be viewed at http://www.swift.ac.uk/xrt_products/00791922.
This circular is an official product of the Swift-XRT team.
GCN Circular #22152
A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), V. D'Elia (ASDC) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.5 ks of XRT data for GRB 171123A (Evans et al. GCN Circ. 22148), from 98 s to 19.7 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 22150).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.4 (+0.7, -0.6). At T+306 s the decay flattens to an alpha of -0.33 (+0.25, -0.45) before breaking again at T+1892 s to a final decay with index alpha=0.68 (+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 2.21 (+0.22, -0.21). The best-fitting absorption column is 8.8 (+5.1, -4.4) x 10^20 cm^-2, in excess of the Galactic value of 1.9 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 2.9 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     8.8 (+5.1, -4.4) x 10^20 cm^-2
Galactic foreground: 1.9 x 10^20 cm^-2
Excess significance: 2.6 sigma
Photon index:	     2.21 (+0.22, -0.21)
```
If the light curve continues to decay with a power-law decay index of 0.68, the count rate at T+24 hours will be 0.010 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.0 x 10^-13 (3.8 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/00791922.
This circular is an official product of the Swift-XRT team.
GCN Circular #22153
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), (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 171123A (trigger #791922) (Evans et al., GCN Circ. 22148). The BAT ground-calculated position is RA, Dec = 186.198, 32.503 deg which is
```
  RA(J2000)  =  12h 24m 47.6s
  Dec(J2000) = +32d 30' 12.5"
```
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 86%.
The mask-weighted light curve shows a weak pulse that starts at ~T-1 s and ends at ~T+20 s, with a tail lasting till ~T+60 s. In addition, there is a weak precursor from ~T-25 s to ~T-20 s. T90 (15-350 keV) is 58.5 +- 27.1 sec (estimated error including systematics).
The time-averaged spectrum from T-1.39 to T+60.29 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.35 +- 0.34. The fluence in the 15-150 keV band is 4.8 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.27 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/791922/BA/
GCN Circular #22154
K. Morita, R. Itoh, K. L. Murata, T. Yoshii, Y. Tachibana, S. Harita, T. Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 171123A (P. A. Evans et al., GCN Circular #22148) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2017-11-23 16:24:30.61 UT. We did not find any new point source within enhanced XRT circle (M.R. Goad et al., GCN Circular #22150) in all three bands. We obtained following limits for the magnitudes.
```
T0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
~3.15       18:56:14.59      9360     >21.1    >20.7     >19.6
-------------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used GSC2.3 catalog for flux calibration.
GCN Circular #22160
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 171123A (Evans, et al., GCN 22148) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2017/11 24.47 to 2017/11 24.54 UTC (21.06 to 22.77 hours after the BAT trigger), obtaining a total of 1.07 hours exposure in the r and i bands and 0.45 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Goad, et al., GCN 22150), in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following upper limits (3-sigma):
```
 r > 23.60
 i > 23.39
 Z > 22.23
 Y > 21.69
 J > 21.43
 H > 21.02
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #22158
S.W.K. Emery (UCL-MSSL) and P. A. Evans (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 171123A 94 s after the BAT trigger (Evans et al., GCN Circ. 22148). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 22150) 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            94          243          147         >20.9
u_FC               308          557          246         >20.5
white               94         2397          489         >21.0
v                  637         2447          214         >18.8
b                  563         2373          194         >19.7
uvw1             13669        18855         1209         >20.7
uvm2             12763        13663          886         >20.6
uvw2             23870        35081         1032         >21.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22161
Z.P. Zhu, H.X. Feng, D. Xu (NAOC), Z. Fan, W. Wang, J. Zheng, N. Song (NAOC), S.G. Ma, J. Liu (XAO), Y.D. Hu (IAA-CSIC) report
We observed the field of GRB 171123A (Evans et al., GCN 22148) using the 1-m telescope located at Nanshan, Xinjiang, China. We obtained 3x120s, 1x180s SDSS i-band and 1x120s r-band frames, starting at 21:12:40 UT on 2017-11-23, i.e., 6.8 hr after the BAT trigger.
No optical source was detected in the stacked image at the XRT position (Goad et al., GCN 22150), down to a limiting magnitude of i~20.6 mag, at the median time of 6.92 hr post-burst, calibrated with the SDSS field.
GCN Circular #22162
S. Schmidl, B. Stecklum, S. Klose, A. Nicuesa Guelbenzu, and C. Hoegner (Thueringer Landessternwarte Tautenburg) report:
We observed the field of GRB 171123A (Evans et al., GCN 22148) in the Rc band using the Tautenburg Schmidt telescope equipped with the prime focus CCD camera. Observations started at 04:01 UT, about 14 hr after the burst.
At the SE border of the enhanced XRT error circle (radius 1.9 arcsec; Goad et al., GCN 22150; 1.5 arcsec acc. to the newest results presented at http://www.swift.ac.uk/xrt_positions/00791922/) we find a faint source at coordinates
```
RA (J2000) : 12:24:59.29,
Dec (J2000): 32:30:03.4  (+/- 0.6 arcsec).
```
At a midtime of 04:46 UT we measure a preliminary magnitude of Rc (Vega) = 22.7 +/- 0.3, calibrated against SDSS field stars.
The non-detection of this source by RATIR eight hours after our observing run (Butler et al., GCN 22160) suggests that this was the GRB afterglow. We caution however that this is only a 3-sigma detection.
GCN Circular #22166
L. Izzo, D. A. Kann, A. de Ugarte Postigo (all HETH/IAA-CSIC), and V. Casanova (IAA-CSIC) report:
We observed the field of GRB 171123A (Evans et al.; GCN Circ. 22148) with the 1.5-m OSN telescope in Granada, Spain.
We began observing at 03:32:53 UT (13.3 hours after the GRB trigger), and obtained 18x300s images in the Ic band. Observations were obtained in inclement conditions (clouds, bad seeing of ~2") and the last four images could not be used.
In our stacked image, we find no source at the position reported by Schmidl et al. (GCN Circ. 22162) down to a a 3-sigma limit of Ic (Vega) > 21. The calibration was performed using nearby stars in the USNO B1 catalog.
GCN Circular #22169
A. Volnova (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva (Fesenkov Astrophysical Institute), E. Mazaeva (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 171123A (Evans et al., GCN 22148) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Nov., 23 (UT) 23:31:56. We took several images in R-filter. Within enhanced XRT error circle (Goad et al., GCN 22150) we do not detect any object. Preliminary photometry of the afterglow is following
```
Date       UT start  t-T0    Filter Exp.   OT     Err. UL
                      (mid, days)     (s)             (3 sigma)

2017-11-23 23:31:56  0.41294  R    38*120  n/d    n/d  22.2
```
Photometry is based on nearby USNO-B1.0 stars, R2 magnitude.

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Jochen Greiner, last update: 25-Nov-2017 [Disclaimer]