Gamma-ray Burst 170127B

(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 27 Jan 17 15:13:44 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     735331,   Seg_Num: 0
GRB_RA:           19.944d {+01h 19m 47s} (J2000),
                  20.144d {+01h 20m 35s} (current),
                  19.359d {+01h 17m 26s} (1950)
GRB_DEC:         -30.338d {-30d 20' 14"} (J2000),
                 -30.248d {-30d 14' 53"} (current),
                 -30.600d {-30d 35' 58"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1153 [cnts]    Image_Peak=110 [image_cnts]
TRIGGER_DUR:     0.128 [sec] 
TRIGGER_INDEX:   122     E_range: 25-100 keV
BKG_INTEN:       33437 [cnts]
BKG_TIME:        54797.47 SOD {15:13:17.47} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17780 TJD;    27 DOY;   17/01/27
GRB_TIME:        54808.67 SOD {15:13:28.67} UT
GRB_PHI:         145.04 [deg]
GRB_THETA:        23.93 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     26.51 [sigma]
IMAGE_SIGNIF:    8.99 [sigma]
MERIT_PARAMS:     +1  +0  +0  -3  +2  -1  +0  +0 -44  +0 
SUN_POSTN:       310.29d {+20h 41m 11s}  -18.30d {-18d 17' 46"}
SUN_DIST:         63.85 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.19d {+20h 20m 46s}  -16.74d {-16d 44' 39"}
MOON_DIST:        68.91 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.92,-83.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        4.87,-35.49 [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 = 5.14,-12.62 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=507222813).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:13:53 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     507222813
GRB_RA:           29.300d {+01h 57m 12s} (J2000),
                  29.485d {+01h 57m 56s} (current),
                  28.759d {+01h 55m 02s} (1950)
GRB_DEC:         -36.283d {-36d 16' 59"} (J2000),
                 -36.200d {-36d 12' 01"} (current),
                 -36.527d {-36d 31' 35"} (1950)
GRB_ERROR:       7.03 [deg radius, statistical plus systematic]
GRB_INTEN:       561 [cnts/sec]
DATA_SIGNIF:     12.70 [sigma]
INTEG_TIME:      0.256 [sec]
GRB_DATE:        17780 TJD;    27 DOY;   17/01/27
GRB_TIME:        54808.77 SOD {15:13:28.77} UT
GRB_PHI:         299.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 0.2560 [sec]
HARD_RATIO:      0.23
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       310.29d {+20h 41m 11s}  -18.30d {-18d 17' 46"}
SUN_DIST:         70.79 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      305.19d {+20h 20m 47s}  -16.74d {-16d 44' 38"}
MOON_DIST:        75.70 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.29,-73.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       10.20,-44.42 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170127634/quicklook/glg_lc_medres34_bn170127634.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 104.28,-17.00 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=735331).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:14:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     507222813
GRB_RA:           23.030d {+01h 32m 07s} (J2000),
                  23.221d {+01h 32m 53s} (current),
                  22.471d {+01h 29m 53s} (1950)
GRB_DEC:         -37.130d {-37d 07' 47"} (J2000),
                 -37.043d {-37d 02' 32"} (current),
                 -37.387d {-37d 23' 11"} (1950)
GRB_ERROR:       4.71 [deg radius, statistical only]
DATA_SIGNIF:     14.20 [sigma]
DATA_INTERVAL:   0.256 [sec]
GRB_DATE:        17780 TJD;    27 DOY;   17/01/27
GRB_TIME:        54808.77 SOD {15:13:28.77} UT
GRB_PHI:         307.00 [deg]
GRB_THETA:        37.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       310.29d {+20h 41m 11s}  -18.30d {-18d 17' 45"}
SUN_DIST:         65.69 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      305.20d {+20h 20m 47s}  -16.74d {-16d 44' 37"}
MOON_DIST:        70.60 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      264.81,-76.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        3.59,-42.68 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170127634/quicklook/glg_lc_medres34_bn170127634.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_507222813.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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=735331).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:14:52 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.936d {+01h 19m 45s} (J2000)
POINT_DEC:       -30.341d {-30d 20' 26"} (J2000)
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  54883.38 SOD {15:14:43.38} UT,   74.7 [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:     Fri 27 Jan 17 15:16:58 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     735331,   Seg_Num: 0
GRB_RA:           19.944d {+01h 19m 47s} (J2000),
                  20.144d {+01h 20m 35s} (current),
                  19.359d {+01h 17m 26s} (1950)
GRB_DEC:         -30.338d {-30d 20' 14"} (J2000),
                 -30.248d {-30d 14' 53"} (current),
                 -30.600d {-30d 35' 58"} (1950)
GRB_DATE:        17780 TJD;    27 DOY;   17/01/27
GRB_TIME:        54808.67 SOD {15:13:28.67} UT
TRIGGER_INDEX:   122
GRB_PHI:         145.04 [deg]
GRB_THETA:        23.93 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     0.128 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     26.51 [sigma]
IMAGE_SIGNIF:    8.99 [sigma]
LC_URL:          sw00735331000msb.lc
SUN_POSTN:       310.30d {+20h 41m 11s}  -18.30d {-18d 17' 44"}
SUN_DIST:         63.85 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.22d {+20h 20m 53s}  -16.74d {-16d 44' 23"}
MOON_DIST:        68.88 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.92,-83.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        4.87,-35.49 [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 = 5.14,-12.62 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:18:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.933d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.338d {-30d 20' 18"} (J2000)
POINT_ROLL:      263.322d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  54922.37 SOD {15:15:22.37} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.485
N_STARS:         11
X_OFFSET:        420 [pixels]
Y_OFFSET:        592 [pixels]
X_MAX:           1379 [pixels]
Y_MAX:           1551 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00735331000msufc0113.fits
SUN_POSTN:       310.30d {+20h 41m 11s}  -18.30d {-18d 17' 43"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.23d {+20h 20m 56s}  -16.74d {-16d 44' 17"}
MOON_DIST:        68.86 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:18:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.933d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.338d {-30d 20' 18"} (J2000)
POINT_ROLL:      263.322d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  54922.37 SOD {15:15:22.37} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.485
N_STARS:         11
X_OFFSET:        420 [pixels]
Y_OFFSET:        592 [pixels]
X_MAX:           1379 [pixels]
Y_MAX:           1551 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00735331000msufc0113.fits
SUN_POSTN:       310.30d {+20h 41m 11s}  -18.30d {-18d 17' 43"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.24d {+20h 20m 57s}  -16.74d {-16d 44' 16"}
MOON_DIST:        68.86 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:18:51 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     735331,   Seg_Num: 0
GRB_RA:           19.9784d {+01h 19m 54.81s} (J2000),
                  20.1781d {+01h 20m 42.74s} (current),
                  19.3931d {+01h 17m 34.34s} (1950)
GRB_DEC:         -30.3574d {-30d 21' 26.6"} (J2000),
                 -30.2681d {-30d 16' 05.2"} (current),
                 -30.6195d {-30d 37' 10.3"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  54890.00 SOD {15:14:50.00} UT,   81.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       310.30d {+20h 41m 12s}  -18.30d {-18d 17' 42"}
SUN_DIST:         63.88 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.24d {+20h 20m 57s}  -16.74d {-16d 44' 14"}
MOON_DIST:        68.90 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-82.97 [deg] galactic lon,lat of the burst
ECL_COORDS:        4.90,-35.52 [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:     Fri 27 Jan 17 15:18:58 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     735331,   Seg_Num: 0
GRB_RA:           19.9770d {+01h 19m 54.48s} (J2000),
                  20.1767d {+01h 20m 42.40s} (current),
                  19.3917d {+01h 17m 34.00s} (1950)
GRB_DEC:         -30.3586d {-30d 21' 30.9"} (J2000),
                 -30.2693d {-30d 16' 09.5"} (current),
                 -30.6207d {-30d 37' 14.6"} (1950)
GRB_ERROR:       2.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  54890.00 SOD {15:14:50.00} UT,   81.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       310.30d {+20h 41m 12s}  -18.30d {-18d 17' 42"}
SUN_DIST:         63.88 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.24d {+20h 20m 58s}  -16.74d {-16d 44' 13"}
MOON_DIST:        68.89 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.98,-82.98 [deg] galactic lon,lat of the burst
ECL_COORDS:        4.89,-35.52 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:19:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.933d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.338d {-30d 20' 18"} (J2000)
ROLL:            263.322d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  54922.37 SOD {15:15:22.37} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     507222940
X_OFFSET:        739 [pixels]
Y_OFFSET:        911 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       899
Y_GRB_POS:       1071
BINNING_INDEX:   1
IM_URL:          sw00735331000msuni0132.fits
SUN_POSTN:       310.30d {+20h 41m 12s}  -18.30d {-18d 17' 42"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.24d {+20h 20m 58s}  -16.74d {-16d 44' 11"}
MOON_DIST:        68.85 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:19:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.933d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.338d {-30d 20' 18"} (J2000)
ROLL:            263.322d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  54922.37 SOD {15:15:22.37} UT,   113.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     507222940
X_OFFSET:        739 [pixels]
Y_OFFSET:        911 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       899
Y_GRB_POS:       1071
BINNING_INDEX:   1
IM_URL:          sw00735331000msuni0132.fits
SUN_POSTN:       310.30d {+20h 41m 12s}  -18.30d {-18d 17' 42"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.25d {+20h 20m 59s}  -16.74d {-16d 44' 10"}
MOON_DIST:        68.85 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:26:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
POINT_ROLL:      263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55134.46 SOD {15:18:54.46} UT,   325.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.661
N_STARS:         53
X_OFFSET:        180 [pixels]
Y_OFFSET:        352 [pixels]
X_MAX:           1619 [pixels]
Y_MAX:           1791 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00735331000msufc0325.fits
SUN_POSTN:       310.30d {+20h 41m 13s}  -18.29d {-18d 17' 37"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.31d {+20h 21m 14s}  -16.73d {-16d 43' 36"}
MOON_DIST:        68.80 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:26:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
POINT_ROLL:      263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55134.46 SOD {15:18:54.46} UT,   325.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.661
N_STARS:         53
X_OFFSET:        180 [pixels]
Y_OFFSET:        352 [pixels]
X_MAX:           1619 [pixels]
Y_MAX:           1791 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00735331000msufc0325.fits
SUN_POSTN:       310.30d {+20h 41m 13s}  -18.29d {-18d 17' 37"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.31d {+20h 21m 15s}  -16.73d {-16d 43' 34"}
MOON_DIST:        68.80 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:27:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
ROLL:            263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55134.46 SOD {15:18:54.46} UT,   325.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     507223152
X_OFFSET:        739 [pixels]
Y_OFFSET:        911 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       899
Y_GRB_POS:       1071
BINNING_INDEX:   1
IM_URL:          sw00735331000msuni0344.fits
SUN_POSTN:       310.30d {+20h 41m 13s}  -18.29d {-18d 17' 36"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.32d {+20h 21m 17s}  -16.73d {-16d 43' 29"}
MOON_DIST:        68.79 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [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 Circular #20540
J. K. Cannizzo (NASA/UMBC), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC), A. Cholden-Brown (PSU), A. D'Ai (INAF-IASFPA), V. D'Elia (ASDC), P.A. Evans (U Leicester), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 15:13:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170127B (trigger=735331). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 19.944, -30.338, which is
```
   RA(J2000)  =  01h 19m 47s
   Dec(J2000) = -30d 20' 14"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike structure with a duration of about 0.2 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 15:14:43.3 UT, 74.7 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 19.9766, -30.3588 which is equivalent to:
```
   RA(J2000)  = 01h 19m 54.37s
   Dec(J2000) = -30d 21' 31.6"
```
with an uncertainty of 2.9 arcseconds (radius, 90% containment). This location is 125 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.01 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 113 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 J. K. Cannizzo (cannizzo AT milkyway.gsfc.nasa.gov). 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 27 Jan 17 15:28:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
ROLL:            263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55134.46 SOD {15:18:54.46} UT,   325.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     507223152
X_OFFSET:        739 [pixels]
Y_OFFSET:        911 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       899
Y_GRB_POS:       1071
BINNING_INDEX:   1
IM_URL:          sw00735331000msuni0344.fits
SUN_POSTN:       310.30d {+20h 41m 13s}  -18.29d {-18d 17' 36"}
SUN_DIST:         63.84 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.33d {+20h 21m 18s}  -16.72d {-16d 43' 27"}
MOON_DIST:        68.79 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:32:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
POINT_ROLL:      263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55689.20 SOD {15:28:09.20} UT,   880.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.449
N_STARS:         104
X_OFFSET:        180 [pixels]
Y_OFFSET:        352 [pixels]
X_MAX:           1619 [pixels]
Y_MAX:           1791 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00735331000msufc0880.fits
SUN_POSTN:       310.31d {+20h 41m 14s}  -18.29d {-18d 17' 33"}
SUN_DIST:         63.83 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.36d {+20h 21m 27s}  -16.72d {-16d 43' 07"}
MOON_DIST:        68.76 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:32:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
POINT_ROLL:      263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55689.20 SOD {15:28:09.20} UT,   880.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.449
N_STARS:         104
X_OFFSET:        180 [pixels]
Y_OFFSET:        352 [pixels]
X_MAX:           1619 [pixels]
Y_MAX:           1791 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00735331000msufc0880.fits
SUN_POSTN:       310.31d {+20h 41m 14s}  -18.29d {-18d 17' 33"}
SUN_DIST:         63.83 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.37d {+20h 21m 28s}  -16.72d {-16d 43' 06"}
MOON_DIST:        68.76 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:33:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
ROLL:            263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55689.20 SOD {15:28:09.20} UT,   880.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     507223707
X_OFFSET:        739 [pixels]
Y_OFFSET:        911 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       899
Y_GRB_POS:       1071
BINNING_INDEX:   1
IM_URL:          sw00735331000msuni0899.fits
SUN_POSTN:       310.31d {+20h 41m 14s}  -18.29d {-18d 17' 33"}
SUN_DIST:         63.83 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.38d {+20h 21m 30s}  -16.72d {-16d 43' 00"}
MOON_DIST:        68.75 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 27 Jan 17 15:34:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     735331,   Seg_Num: 0
POINT_RA:         19.934d {+01h 19m 44s} (J2000)
POINT_DEC:       -30.340d {-30d 20' 22"} (J2000)
ROLL:            263.321d
IMG_START_DATE:  17780 TJD;    27 DOY;   17/01/27
IMG_START_TIME:  55689.20 SOD {15:28:09.20} UT,   880.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     507223707
X_OFFSET:        739 [pixels]
Y_OFFSET:        911 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       899
Y_GRB_POS:       1071
BINNING_INDEX:   1
IM_URL:          sw00735331000msuni0899.fits
SUN_POSTN:       310.31d {+20h 41m 14s}  -18.29d {-18d 17' 32"}
SUN_DIST:         63.83 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      305.38d {+20h 21m 32s}  -16.72d {-16d 42' 57"}
MOON_DIST:        68.75 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      241.97,-83.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        4.86,-35.48 [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 #20541
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, A. Gabovich, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, O. Ershova Irkutsk State University
R. Podesta, Claudio Mallamaci, Carlos Lopez and Federico Podesta Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB170127B 37 sec after notice time and 52 sec after trigger time at 2017-01-27 15:14:21 UT in two polarization. On our first (10s exposure) set we haven`t found optical transient within SWIFT error-box (Cannizzo et al GCN 20540). The 5-sigma upper limit has been about 17.0 mag on single (10 s) and 19.5 on coadd (total exposure 540 s) images. The message may be cited.
====================================================================
The observations made on zenit distance = 76 degrees, galaxy latitude b = -83 degree. The moon ( 0 % bright part) below the horizon (The altitude of the Moon is -14 degree ). Observations started at twilight. The sun altitude is -11.4 degree.
GCN Circular #20549
=E2=80=8BZ. Cano (IAA-CSIC), K. E. Heintz (Univ. Iceland & DARK/NBI), D. Malesani (=E2=80=8BDARK/NBI and DTU Space=E2=80=8B)=E2=80=8B & R. Tronsgaard (NOT) report on behalf of a larger collaboration:
We observed the field of short-duration GRB 170127B (Cannizzo et al.; GCN Circ. 20540) with the 2.5-m Nordic Optical Telescope equipped with ALFOSC, starting at 19:48:56 UT on 27 January 2017 (4.59 hrs from detection). We obtained 3x300 s in the r-band. In our co-added image no new object is detected in the XRT error circle to the following limit:
```
Filter    t-t0 (hr)     magnitude (AB)
-------------------------------------------
  r        4.73           >23.4
```
The r-band upper limit is for an isolated point source in the GRB field, which is calibrated to local Pan-STARRS standards in the field. This upper limit is not corrected for foreground extinction (E(B-V) =3D 0.02 mag, Schlegel et al. 1998).
GCN Circular #20550
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1434 s of XRT Photon Counting mode data and 2 UVOT images for GRB 170127B, 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 = 19.97709, -30.35807 which is equivalent to:
```
RA (J2000): 01h 19m 54.50s
Dec (J2000): -30d 21' 29.1"
```
with an uncertainty of 2.0 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 #20551
P. Veres and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 15:13:28.77 UT on 27 January 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170127B (trigger 507222813 / 170127634) which was also detected by the Swift/BAT (Cannizzo et al., GCN 20540). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 44 degrees.
The GBM light curve shows two overlapping pulses with a duration (T90) of about 1.7 s (50-300 keV). The time-averaged spectrum from T0-0.1 s to T0+0.4 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.67 +/- 0.16 and the cutoff energy, parameterized as Epeak, is 688 +/- 195 keV.
The event fluence (10-1000 keV) in this time interval is (7.6 +/- 0.6)E-7 erg/cm^2. The 64 ms peak photon flux measured starting from T0-64 ms in the 10-1000 keV band is 8.4 +/- 1.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #20554
F. E. Marshall (NASA/GSFC) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170127B 114 s after the BAT trigger (Cannizzo et al., GCN Circ. 20540). No optical afterglow consistent with the enhanced XRT position (Goad et al. GCN Circ. 20550) 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) exposures and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           114          264          147         >21.2
u_FC               327          576          246         >19.9
white              114         1377          373         >21.0
v                  656         1427           97         >19.4
u                  327          576          246         >19.9
```
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 #20560
K.L. Page (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), B. Mingo (U. Leicester), A.P. Beardmore (U. Leicester) and report on behalf of the Swift-XRT team: report on behalf of the Swift-XRT team:
We have analysed 2.8 ks of XRT data for GRB 170127B, from 60 s to 10.6 ks after the BAT trigger. The data comprise 7 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.7 (+0.5, -0.4).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.57 (+0.27, -0.23). The best-fitting absorption column is consistent with the Galactic value of 2.0 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 4.1 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.0 (+/-4.2) x 10^20 cm^-2
Galactic foreground: 2.0 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.57 (+0.27, -0.23)
```
If the light curve continues to decay with a power-law decay index of 1.7, the count rate at T+24 hours will be 6.7 x 10^-6 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.7 x 10^-16 (2.8 x 10^-16) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00735331.
This circular is an official product of the Swift-XRT team.
GCN Circular #20566
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. K. Cannizzo (NASA/UMBC), J. R. Cummings (CPI), N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU),
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170127B (trigger #735331) (Cannizzo et al., GCN Circ. 20540). The BAT ground-calculated position is RA, Dec = 19.997, -30.340 deg which is
```
   RA(J2000)  =  01h 19m 59.2s
   Dec(J2000) = -30d 20' 25.2"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%.
The mask-weighted light curve shows a single-peaked structure that starts and peaks at ~T0, and ends at ~T+0.6 s. T90 (15-350 keV) is 0.51 +- 0.14 sec (estimated error including systematics).
The time-averaged spectrum from T+0.05 to T+0.64 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.89 +- 0.25. The fluence in the 15-150 keV band is 1.0 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.16 sec in the 15-150 keV band is 1.1 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
Using a 8-ms binned light curve, the lag analysis finds a lag of -4 (-17, +8) ms for the 100-350 keV to 25-50 keV, and -12 (-8, +8) ms for the 50-100 keV to 15-25 keV band. These values are consistent with those of a short GRB. Moreover, no extended emission are found.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/735331/BA/
photometric redshift z = 2.21 +0.22 -0.64
of host-galaxy: A. E. Nugent et al. 2022, ApJ, 940, 57

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Jochen Greiner, last update: 12-Jan-2023 [Disclaimer]