Gamma-ray Burst 170113A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:04:25 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     732526,   Seg_Num: 0
GRB_RA:           61.648d {+04h 06m 36s} (J2000),
                  61.611d {+04h 06m 27s} (current),
                  61.762d {+04h 07m 03s} (1950)
GRB_DEC:         -71.925d {-71d 55' 28"} (J2000),
                 -71.880d {-71d 52' 45"} (current),
                 -72.057d {-72d 03' 23"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4164 [cnts]    Image_Peak=194 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       26180 [cnts]
BKG_TIME:        36229.54 SOD {10:03:49.54} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17766 TJD;    13 DOY;   17/01/13
GRB_TIME:        36245.48 SOD {10:04:05.48} UT
GRB_PHI:         109.06 [deg]
GRB_THETA:        14.52 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.22 [sigma]
IMAGE_SIGNIF:    8.08 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2  +0  +0 -17  +0 
SUN_POSTN:       295.26d {+19h 41m 03s}  -21.41d {-21d 24' 23"}
SUN_DIST:         79.91 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.68d {+08h 30m 44s}  +16.49d {+16d 29' 12"}
MOON_DIST:        98.55 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.71,-37.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      319.10,-78.76 [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 = 111.87,-18.00 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(5.0<100sec) coincident with the FERMI_GBM event (trignum=505994655).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:04:37 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     505994655
GRB_RA:           83.333d {+05h 33m 20s} (J2000),
                  83.248d {+05h 33m 00s} (current),
                  83.584d {+05h 34m 20s} (1950)
GRB_DEC:         -72.750d {-72d 45' 00"} (J2000),
                 -72.739d {-72d 44' 19"} (current),
                 -72.782d {-72d 46' 53"} (1950)
GRB_ERROR:       27.32 [deg radius, statistical plus systematic]
GRB_INTEN:       82 [cnts/sec]
DATA_SIGNIF:     5.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17766 TJD;    13 DOY;   17/01/13
GRB_TIME:        36250.11 SOD {10:04:10.11} UT
GRB_PHI:         211.00 [deg]
GRB_THETA:       140.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.81
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       295.26d {+19h 41m 04s}  -21.41d {-21d 24' 22"}
SUN_DIST:         83.44 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      127.68d {+08h 30m 44s}  +16.49d {+16d 29' 11"}
MOON_DIST:        93.89 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      283.78,-31.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      287.43,-83.40 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170113420/quicklook/glg_lc_medres34_bn170113420.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 220.52,14.27 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=732526).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:04:47 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     505994655
GRB_RA:           75.200d {+05h 00m 48s} (J2000),
                  75.214d {+05h 00m 51s} (current),
                  75.160d {+05h 00m 38s} (1950)
GRB_DEC:         -65.830d {-65d 49' 47"} (J2000),
                 -65.806d {-65d 48' 20"} (current),
                 -65.901d {-65d 54' 03"} (1950)
GRB_ERROR:       13.59 [deg radius, statistical only]
DATA_SIGNIF:     5.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17766 TJD;    13 DOY;   17/01/13
GRB_TIME:        36250.11 SOD {10:04:10.11} UT
GRB_PHI:         200.00 [deg]
GRB_THETA:       138.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       295.26d {+19h 41m 04s}  -21.41d {-21d 24' 22"}
SUN_DIST:         87.66 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      127.69d {+08h 30m 45s}  +16.49d {+16d 29' 10"}
MOON_DIST:        91.12 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      276.37,-35.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        0.16,-84.00 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170113420/quicklook/glg_lc_medres34_bn170113420.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_505994655.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=732526).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:05:57 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     505994655
GRB_RA:           62.110d {+04h 08m 26s} (J2000),
                  62.149d {+04h 08m 36s} (current),
                  61.998d {+04h 08m 00s} (1950)
GRB_DEC:         -65.000d {-65d 00' 00"} (J2000),
                 -64.956d {-64d 57' 19"} (current),
                 -65.130d {-65d 07' 49"} (1950)
GRB_ERROR:       10.94 [deg radius, statistical only]
DATA_SIGNIF:     5.90 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        17766 TJD;    13 DOY;   17/01/13
GRB_TIME:        36250.11 SOD {10:04:10.11} UT
GRB_PHI:         194.00 [deg]
GRB_THETA:       142.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 22"}
SUN_DIST:         84.60 [deg]   Sun_angle= -8.5 [hr] (East of Sun)
MOON_POSTN:      127.70d {+08h 30m 47s}  +16.48d {+16d 29' 03"}
MOON_DIST:        95.11 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      277.75,-41.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      354.85,-78.55 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170113420/quicklook/glg_lc_medres34_bn170113420.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_505994655.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=732526).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:05:43 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     732526,   Seg_Num: 0
GRB_RA:           61.7302d {+04h 06m 55.24s} (J2000),
                  61.6926d {+04h 06m 46.23s} (current),
                  61.8451d {+04h 07m 22.83s} (1950)
GRB_DEC:         -71.9436d {-71d 56' 36.9"} (J2000),
                 -71.8987d {-71d 53' 55.1"} (current),
                 -72.0752d {-72d 04' 30.7"} (1950)
GRB_ERROR:       5.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.01e-09 [erg/cm2/sec]
GRB_SIGNIF:      6.48 [sigma]
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36304.23 SOD {10:05:04.23} UT,   58.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.71 237.21 261.59 243.54
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 22"}
SUN_DIST:         79.91 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.70d {+08h 30m 47s}  +16.48d {+16d 29' 04"}
MOON_DIST:        98.54 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.71,-37.95 [deg] galactic lon,lat of the burst
ECL_COORDS:      318.97,-78.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.90 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:05:53 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     732526,   Seg_Num: 0
GRB_RA:           61.7302d {+04h 06m 55.2s} (J2000),
                  61.6926d {+04h 06m 46.2s} (current),
                  61.8451d {+04h 07m 22.8s} (1950)
GRB_DEC:         -71.9436d {-71d 56' 36.9"} (J2000),
                 -71.8987d {-71d 53' 55.1"} (current),
                 -72.0752d {-72d 04' 30.7"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       42 [cnts]
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36304.23 SOD {10:05:04.23} UT,   58.8 [sec] since BAT Trigger Time
CENTROID_X:      353.18,  raw= 353  [pixels]
CENTROID_Y:      332.54,  raw= 333  [pixels]
ROLL:            229.64 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   80.49
GRB_POS_XRT_Z:   110.28
IMAGE_URL:       sw00732526000msxps_rw.img
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 22"}
SUN_DIST:         79.91 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.70d {+08h 30m 47s}  +16.48d {+16d 29' 03"}
MOON_DIST:        98.54 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.71,-37.95 [deg] galactic lon,lat of the burst
ECL_COORDS:      318.97,-78.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:06:04 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     732526,   Seg_Num: 0
GRB_RA:           61.7302d {+04h 06m 55.2s} (J2000),
                  61.6926d {+04h 06m 46.2s} (current),
                  61.8451d {+04h 07m 22.8s} (1950)
GRB_DEC:         -71.9436d {-71d 56' 36.9"} (J2000),
                 -71.8987d {-71d 53' 55.1"} (current),
                 -72.0752d {-72d 04' 30.7"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       42 [cnts]
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36304.23 SOD {10:05:04.23} UT,   58.8 [sec] since BAT Trigger Time
CENTROID_X:      353.18,  raw= 353  [pixels]
CENTROID_Y:      332.54,  raw= 333  [pixels]
ROLL:            229.64 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   80.49
GRB_POS_XRT_Z:   110.28
IMAGE_URL:       sw00732526000msxps_rw.img
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 22"}
SUN_DIST:         79.91 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.70d {+08h 30m 48s}  +16.48d {+16d 29' 02"}
MOON_DIST:        98.54 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.71,-37.95 [deg] galactic lon,lat of the burst
ECL_COORDS:      318.97,-78.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:07:38 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     732526,   Seg_Num: 0
GRB_RA:           61.648d {+04h 06m 36s} (J2000),
                  61.611d {+04h 06m 27s} (current),
                  61.762d {+04h 07m 03s} (1950)
GRB_DEC:         -71.925d {-71d 55' 28"} (J2000),
                 -71.880d {-71d 52' 45"} (current),
                 -72.057d {-72d 03' 23"} (1950)
GRB_DATE:        17766 TJD;    13 DOY;   17/01/13
GRB_TIME:        36245.48 SOD {10:04:05.48} UT
TRIGGER_INDEX:   146
GRB_PHI:         109.06 [deg]
GRB_THETA:        14.52 [deg]
DELTA_TIME:      7.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.22 [sigma]
IMAGE_SIGNIF:    8.08 [sigma]
LC_URL:          sw00732526000msb.lc
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 21"}
SUN_DIST:         79.91 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.71d {+08h 30m 52s}  +16.48d {+16d 28' 53"}
MOON_DIST:        98.56 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.71,-37.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      319.10,-78.76 [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 = 111.87,-18.00 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:08:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.609d {+04h 06m 26s} (J2000)
POINT_DEC:       -71.946d {-71d 56' 44"} (J2000)
POINT_ROLL:      229.640d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36312.68 SOD {10:05:12.68} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.139
N_STARS:         49
X_OFFSET:        336 [pixels]
Y_OFFSET:        696 [pixels]
X_MAX:           1295 [pixels]
Y_MAX:           1655 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00732526000msufc0067.fits
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 21"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.72d {+08h 30m 53s}  +16.48d {+16d 28' 50"}
MOON_DIST:        98.58 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:08:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.609d {+04h 06m 26s} (J2000)
POINT_DEC:       -71.946d {-71d 56' 44"} (J2000)
POINT_ROLL:      229.640d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36312.68 SOD {10:05:12.68} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.139
N_STARS:         49
X_OFFSET:        336 [pixels]
Y_OFFSET:        696 [pixels]
X_MAX:           1295 [pixels]
Y_MAX:           1655 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00732526000msufc0067.fits
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 21"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.72d {+08h 30m 54s}  +16.48d {+16d 28' 48"}
MOON_DIST:        98.58 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:09:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.609d {+04h 06m 26s} (J2000)
POINT_DEC:       -71.946d {-71d 56' 44"} (J2000)
ROLL:            229.640d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36312.68 SOD {10:05:12.68} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505994731
X_OFFSET:        511 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       671
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00732526000msuni0086.fits
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 20"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.74d {+08h 30m 57s}  +16.48d {+16d 28' 40"}
MOON_DIST:        98.58 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:09:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.609d {+04h 06m 26s} (J2000)
POINT_DEC:       -71.946d {-71d 56' 44"} (J2000)
ROLL:            229.640d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36312.68 SOD {10:05:12.68} UT,   67.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505994731
X_OFFSET:        511 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       671
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00732526000msuni0086.fits
SUN_POSTN:       295.27d {+19h 41m 04s}  -21.41d {-21d 24' 20"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.74d {+08h 30m 57s}  +16.48d {+16d 28' 39"}
MOON_DIST:        98.58 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:11:40 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     732526,   Seg_Num: 0
GRB_RA:           61.7327d {+04h 06m 55.84s} (J2000),
                  61.6951d {+04h 06m 46.83s} (current),
                  61.8476d {+04h 07m 23.43s} (1950)
GRB_DEC:         -71.9429d {-71d 56' 34.4"} (J2000),
                 -71.8980d {-71d 53' 52.6"} (current),
                 -72.0745d {-72d 04' 28.2"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.38 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36309.00 SOD {10:05:09.00} UT,   63.5 [sec] since BAT Trigger Time
SUN_POSTN:       295.27d {+19h 41m 05s}  -21.41d {-21d 24' 19"}
SUN_DIST:         79.91 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.76d {+08h 31m 01s}  +16.47d {+16d 28' 29"}
MOON_DIST:        98.55 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.71,-37.95 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      318.98,-78.78 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 3.6 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:16:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.947d {-71d 56' 48"} (J2000)
POINT_ROLL:      229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36524.72 SOD {10:08:44.72} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.500
N_STARS:         22
X_OFFSET:        191 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1150 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00732526000msufc0279.fits
SUN_POSTN:       295.27d {+19h 41m 06s}  -21.41d {-21d 24' 17"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.80d {+08h 31m 13s}  +16.47d {+16d 28' 01"}
MOON_DIST:        98.59 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:16:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.947d {-71d 56' 48"} (J2000)
POINT_ROLL:      229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36524.72 SOD {10:08:44.72} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.500
N_STARS:         22
X_OFFSET:        191 [pixels]
Y_OFFSET:        523 [pixels]
X_MAX:           1150 [pixels]
Y_MAX:           1482 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00732526000msufc0279.fits
SUN_POSTN:       295.27d {+19h 41m 06s}  -21.41d {-21d 24' 17"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.81d {+08h 31m 14s}  +16.47d {+16d 27' 59"}
MOON_DIST:        98.59 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:18:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.947d {-71d 56' 48"} (J2000)
ROLL:            229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36524.72 SOD {10:08:44.72} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     505994943
X_OFFSET:        511 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       671
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00732526000msuni0298.fits
SUN_POSTN:       295.27d {+19h 41m 06s}  -21.40d {-21d 24' 17"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.82d {+08h 31m 17s}  +16.46d {+16d 27' 51"}
MOON_DIST:        98.59 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:18:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.947d {-71d 56' 48"} (J2000)
ROLL:            229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36524.72 SOD {10:08:44.72} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     505994943
X_OFFSET:        511 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       671
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00732526000msuni0298.fits
SUN_POSTN:       295.27d {+19h 41m 06s}  -21.40d {-21d 24' 17"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.82d {+08h 31m 17s}  +16.46d {+16d 27' 51"}
MOON_DIST:        98.59 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #20446
P.A. Evans (U Leicester), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), H. A. Krimm (CRESST/NSF/USRA), B. Mingo (U Leicester), P. T. O'Brien (U Leicester), B. Sbarufatti (INAF-OAB/PSU), R. L. C. Starling (U Leicester) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift Team:
At 10:04:05 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170113A (trigger=732526). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 61.648, -71.925, which is
```
   RA(J2000)  =  04h 06m 36s
   Dec(J2000) = -71d 55' 28"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a duration of about 30 sec. The peak count rate was ~2100 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 10:05:04.2 UT, 58.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 61.73063, -71.94326 which is equivalent to:
```
   RA(J2000)  = 04h 06m 55.35s
   Dec(J2000) = -71d 56' 35.7"
```
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 113 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. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 2.5 s image was 1.01e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 67 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	04:06:55.85 =  61.73272
  DEC(J2000) = -71:56:34.5  = -71.94293
```
with a 90%-confidence error radius of about 0.62 arc sec. This position is 3.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.39 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.11.
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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:24:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.948d {-71d 56' 50"} (J2000)
POINT_ROLL:      229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  37104.57 SOD {10:18:24.57} UT,   859.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.540
N_STARS:         114
X_OFFSET:        0 [pixels]
Y_OFFSET:        283 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1722 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00732526000msufc0859.fits
SUN_POSTN:       295.28d {+19h 41m 07s}  -21.40d {-21d 24' 14"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.88d {+08h 31m 32s}  +16.45d {+16d 27' 15"}
MOON_DIST:        98.60 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:24:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.948d {-71d 56' 50"} (J2000)
POINT_ROLL:      229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  37104.57 SOD {10:18:24.57} UT,   859.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.540
N_STARS:         114
X_OFFSET:        0 [pixels]
Y_OFFSET:        283 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1722 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00732526000msufc0859.fits
SUN_POSTN:       295.28d {+19h 41m 07s}  -21.40d {-21d 24' 14"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.89d {+08h 31m 33s}  +16.45d {+16d 27' 12"}
MOON_DIST:        98.60 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:24:46 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     732526,   Seg_Num: 0
GRB_RA:           61.7336d {+04h 06m 56.06s} (J2000),
                  61.6961d {+04h 06m 47.05s} (current),
                  61.8485d {+04h 07m 23.64s} (1950)
GRB_DEC:         -71.9424d {-71d 56' 32.6"} (J2000),
                 -71.8975d {-71d 53' 50.8"} (current),
                 -72.0740d {-72d 04' 26.4"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  36555.00 SOD {10:09:15.00} UT,   309.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       295.28d {+19h 41m 07s}  -21.40d {-21d 24' 14"}
SUN_DIST:         79.91 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.89d {+08h 31m 33s}  +16.45d {+16d 27' 11"}
MOON_DIST:        98.56 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.71,-37.95 [deg] galactic lon,lat of the burst
ECL_COORDS:      318.98,-78.78 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:25:44 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.948d {-71d 56' 50"} (J2000)
ROLL:            229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  37104.57 SOD {10:18:24.57} UT,   859.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505995523
X_OFFSET:        559 [pixels]
Y_OFFSET:        842 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1002
BINNING_INDEX:   1
IM_URL:          sw00732526000msuni0878.fits
SUN_POSTN:       295.28d {+19h 41m 07s}  -21.40d {-21d 24' 13"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.90d {+08h 31m 36s}  +16.45d {+16d 27' 05"}
MOON_DIST:        98.60 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 13 Jan 17 10:25:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     732526,   Seg_Num: 0
POINT_RA:         61.602d {+04h 06m 25s} (J2000)
POINT_DEC:       -71.948d {-71d 56' 50"} (J2000)
ROLL:            229.645d
IMG_START_DATE:  17766 TJD;    13 DOY;   17/01/13
IMG_START_TIME:  37104.57 SOD {10:18:24.57} UT,   859.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505995523
X_OFFSET:        559 [pixels]
Y_OFFSET:        842 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1002
BINNING_INDEX:   1
IM_URL:          sw00732526000msuni0878.fits
SUN_POSTN:       295.28d {+19h 41m 07s}  -21.40d {-21d 24' 13"}
SUN_DIST:         79.88 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:      127.90d {+08h 31m 36s}  +16.45d {+16d 27' 04"}
MOON_DIST:        98.60 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      285.74,-37.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      319.01,-78.74 [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 #20448
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc (U. Nova Gorica), C.G. Mundell (U. Bath) on behalf of a large collaboration report:
We observed Swift GRB 170113A (Evans et al. GCN 20446) on January 13, from 10:53:32 UT (50 minutes since the GRB) with 1-m LCO telescope units in Sutherland with SDSS r and i filters. We clearly detect the Swift-UVOT optical counterpart with the following values:
```
Mid Time      Exposure       Filter       Magnitude (AB)
(hours)           (s)
-------------------------------------------------------
0.89             5x60         SDSS-R      19.06 +- 0.11
0.89             5x60         SDSS-I      18.84 +- 0.08
-------------------------------------------------------
```
as calibrated against nearby USNO-UCAC4 sources.
GCN Circular #20450
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1363 s of XRT Photon Counting mode data and 1 UVOT images for GRB 170113A, 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 = 61.73332, -71.94279 which is equivalent to:
```
RA (J2000): 04h 06m 56.00s
Dec (J2000): -71d 56' 34.0"
```
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 #20452
P. Veres (UAH), C. Meegan (UAH) and A. von Kienlin (MPE) report on behalf of the Fermi GBM Team:
"At 10:04:10.11 UT on 13 January 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170113A (trigger 505994655 / 170113420). which was also detected by the Swift/BAT (Evans et al., GCN 20446). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 145 degrees.
The GBM light curve shows a single pulse with a duration (T90) of about 49 s (50-300 keV). The time-averaged spectrum from T0-10 s to T0+47 s is adequately fit by a simple power law function with index -2.05 +/- 0.08.
The event fluence (10-1000 keV) in this time interval is (3.8 +/- 0.4)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.5 s in the 10-1000 keV band is 2.9 +/- 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 #20454
A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Cholden-Brown (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), B. Mingo (U. Leicester), V. D'Elia (ASDC) and report on behalf of the Swift-XRT team: report on behalf of the Swift-XRT team:
We have analysed 8.0 ks of XRT data for GRB 170113A, from 50 s to 19.1 ks after the BAT trigger. The data comprise 243 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode.
The late-time light curve (from T0+5.2 ks) can be modelled with a power-law decay with a decay index of alpha=1.14 (+/-0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.88 (+/-0.07). The best-fitting absorption column is 1.82 (+0.26, -0.24) x 10^21 cm^-2, in excess of the Galactic value of 1.1 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.77 (+/-0.08) and a best-fitting absorption column of 1.43 (+0.26, -0.25) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (4.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.43 (+0.26, -0.25) x 10^21 cm^-2
Galactic foreground: 1.1 x 10^21 cm^-2
Excess significance: 2.3 sigma
Photon index:	     1.77 (+/-0.08)
```
If the light curve continues to decay with a power-law decay index of 1.14, the count rate at T+24 hours will be 0.030 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-12 (1.4 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/00732526.
This circular is an official product of the Swift-XRT team.

GCN Circular #20455
M. H. Siegel (PSU) 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 170113A 68 s after the BAT trigger (Evans et al., GCN Circ. 20446). A fading source consistent with the XRT position (Goad et al. GCN Circ. 20450) is detected in the initial UVOT exposures.
The preliminary UVOT position is:

   RA  (J2000) =  04:06:55.86 =  61.73276 (deg.)
   Dec (J2000) = -71:56:34.9  = -71.94302 (deg.)

with an estimated uncertainty of 0.44 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white (fc)          68          217          147         18.27+-0.06
white              560         1009          186         19.56+-0.11
white             1163         1875           97         19.65+-0.17
white             6392         6592          196         20.64+-0.26
v                  609         1751          136         19.09+-0.36
v                 5367         7002          393         >19.49
b                  535         1850          136         19.33+-0.19
b                 6188         6388          196         >20.39
u (fc)             280          530          245         18.76+-0.13
u                  683         1825          116         19.33+-0.27
u                 5983         7615          390         >20.44
uvw1               659         1801          136         >19.38
uvm2               634         1776          136         >19.12
uvw2               585         1727          136         >19.42

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.11 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #20456
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (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 170113A (trigger #732526) (Evans et al., GCN Circ. 20446). The BAT ground-calculated position is RA, Dec = 61.735, -71.933 deg which is
```
   RA(J2000)  =  04h 06m 56.5s
   Dec(J2000) = -71d 55' 58.0"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 86%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~T0 and ends at ~T+25 s. The main peak occurs at ~T+2 s. T90 (15-350 keV) is 20.66 +- 4.44 sec (estimated error including systematics).
The time-averaged spectrum from T-0.61 to T+23.84 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.75 +- 0.59, and Epeak of 73.3 +- 33.6 keV (chi squared 72.24 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 6.7 +- 0.7 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T+1.63 sec in the 15-150 keV band is 1.1 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.57 +- 0.13 (chi squared 79.06 for 57 d.o.f.). 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/732526/BA/
GCN Circular #20457
T. Kruehler (MPE Garching) reports:
I observed the field of GRB 170113A (Swift trigger 732526; Evans et al. GCN #20446) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at the ESO La Silla Observatory (Chile).
Observations started at 01:34 UT on 2017-01-14, 15.5 hr after the GRB trigger. Based on combined images with 22 min of total exposure time in g'r'i'z' and 18 min in JHK at a mid-time of 01:50 UT on 2017-01-14, I derive the following preliminary magnitudes and upper limits (all in the AB system) for the optical/NIR afterglow (Evans et al., GCN 20446, Guidorzi et al., GCN 20448, Siegel et al., GCN 20455):
```
g' = 22.3 +- 0.1 mag
r' = 22.0 +- 0.1 mag
i' = 21.8 +- 0.1 mag
z' = 21.6 +- 0.1 mag
J = 20.9 +- 0.2 mag
H = 20.8 +- 0.3 mag
K > 19.0 mag
```
Given magnitudes are calibrated against GROND zeropoints and 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.099 mag in the direction of the burst (Schlafly & Finkbeiner 2011).
I acknowledge excellent help in obtaining these data from the supporting astronomer on La Silla, Regis Lachaume.
GCN Circular #20458
D. Xu (NAOC/CAS), K. E. Heintz (Univ. Iceland and DARK/NBI), D. Malesani, J. P. U. Fynbo (DARK/NBI) report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 170113A (Evans et al. GCN 20446; Veres et al., GCN 20452; Guidorzi et al., GCN 20448) with the ESO Very Large Telescope UT 2 (Kueyen) equipped with the X-shooter spectrograph, covering the wavelength range 3500-20000 AA. Spectroscopy started at 01:17:53 UT on 2017-01-14 (i.e., 15.23 hr after the GRB) and consisted of 4 exposures of 1200 s each.
From the acquisition image prior to the spectroscopy, the afterglow has m(r)~21.7 mag, calibrated with nearby USNO B1 stars.
The spectrum exhibits several absorption features such as Si II, Fe II, Mg II, as well as emission features such as [O II] doublet, Hbeta, [OIII] doublet, all at a common redshift of z=1.968. We conclude this is the redshift of the GRB.
We acknowledge the excellent support from the ESO staff, particularly Luca Sbordone, Laura Magrini, Cedric Ledoux, and Elizabeth (Liz) Bartlett, in obtaining these observations.

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Jochen Greiner, last update: 14-Jan-2017 [Disclaimer]