Gamma-ray Burst 170405A

(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:     Wed 05 Apr 17 18:40:43 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     745797,   Seg_Num: 0
GRB_RA:          219.810d {+14h 39m 14s} (J2000),
                 220.060d {+14h 40m 15s} (current),
                 219.087d {+14h 36m 21s} (1950)
GRB_DEC:         -25.244d {-25d 14' 36"} (J2000),
                 -25.317d {-25d 19' 01"} (current),
                 -25.029d {-25d 01' 42"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       31523 [cnts]    Image_Peak=431 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   343     E_range: 50-350 keV
BKG_INTEN:       140118 [cnts]
BKG_TIME:        67101.13 SOD {18:38:21.13} UT
BKG_DUR:         64 [sec]
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67188.43 SOD {18:39:48.43} UT
GRB_PHI:          77.77 [deg]
GRB_THETA:        41.39 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     57.53 [sigma]
IMAGE_SIGNIF:    9.82 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +3  +0  +0  +0 +86  +0 
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 33"}
SUN_DIST:        149.37 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.35d {+08h 53m 25s}  +15.52d {+15d 31' 16"}
MOON_DIST:        93.69 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.68, 31.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.25, -9.26 [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 = 127.88,-13.09 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(26.0<100sec) coincident with the FERMI_GBM event (trignum=513110367).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:39:47 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     513110367
GRB_RA:          205.050d {+13h 40m 12s} (J2000),
                 205.287d {+13h 41m 09s} (current),
                 204.365d {+13h 37m 28s} (1950)
GRB_DEC:         -21.017d {-21d 01' 00"} (J2000),
                 -21.104d {-21d 06' 12"} (current),
                 -20.764d {-20d 45' 49"} (1950)
GRB_ERROR:       23.52 [deg radius, statistical plus systematic]
GRB_INTEN:       108 [cnts/sec]
DATA_SIGNIF:     7.20 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67162.89 SOD {18:39:22.89} UT
GRB_PHI:         180.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.40
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 1,0,0, 0,0,
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 32"}
SUN_DIST:        162.15 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      133.34d {+08h 53m 23s}  +15.52d {+15d 31' 22"}
MOON_DIST:        79.50 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      317.94, 40.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      210.86, -9.89 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170405777/quicklook/glg_lc_medres34_bn170405777.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 144.95,21.92 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:39:56 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     513110367
GRB_RA:          213.650d {+14h 14m 36s} (J2000),
                 213.899d {+14h 15m 36s} (current),
                 212.930d {+14h 11m 43s} (1950)
GRB_DEC:         -27.583d {-27d 34' 59"} (J2000),
                 -27.663d {-27d 39' 46"} (current),
                 -27.351d {-27d 21' 01"} (1950)
GRB_ERROR:       9.08 [deg radius, statistical plus systematic]
GRB_INTEN:       231 [cnts/sec]
DATA_SIGNIF:     20.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67162.89 SOD {18:39:22.89} UT
GRB_PHI:         183.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.66
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 1,0,0, 0,0,
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 32"}
SUN_DIST:        152.09 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:      133.35d {+08h 53m 23s}  +15.52d {+15d 31' 21"}
MOON_DIST:        89.09 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      324.65, 31.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      220.71,-13.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170405777/quicklook/glg_lc_medres34_bn170405777.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 144.95,21.92 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:40:00 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     513110367
GRB_RA:          214.910d {+14h 19m 38s} (J2000),
                 215.148d {+14h 20m 35s} (current),
                 214.223d {+14h 16m 54s} (1950)
GRB_DEC:         -16.500d {-16d 30' 00"} (J2000),
                 -16.579d {-16d 34' 42"} (current),
                 -16.271d {-16d 16' 14"} (1950)
GRB_ERROR:       6.73 [deg radius, statistical only]
DATA_SIGNIF:     16.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67162.89 SOD {18:39:22.89} UT
GRB_PHI:         195.00 [deg]
GRB_THETA:        43.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 32"}
SUN_DIST:        157.71 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:      133.35d {+08h 53m 23s}  +15.52d {+15d 31' 21"}
MOON_DIST:        86.83 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.61, 41.41 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      218.10, -2.42 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170405777/quicklook/glg_lc_medres34_bn170405777.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_513110367.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:40:05 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      68
TRIGGER_NUM:     513110367
GRB_RA:          217.917d {+14h 31m 40s} (J2000),
                 218.164d {+14h 32m 39s} (current),
                 217.202d {+14h 28m 48s} (1950)
GRB_DEC:         -23.833d {-23d 49' 59"} (J2000),
                 -23.909d {-23d 54' 31"} (current),
                 -23.613d {-23d 36' 44"} (1950)
GRB_ERROR:       7.17 [deg radius, statistical plus systematic]
GRB_INTEN:       360 [cnts/sec]
DATA_SIGNIF:     33.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67162.89 SOD {18:39:22.89} UT
GRB_PHI:         190.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.63
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 1,0,0, 0,0,
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 32"}
SUN_DIST:        151.59 [deg]   Sun_angle= 10.4 [hr] (West of Sun)
MOON_POSTN:      133.35d {+08h 53m 23s}  +15.52d {+15d 31' 20"}
MOON_DIST:        91.66 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      330.65, 33.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      223.15, -8.46 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170405777/quicklook/glg_lc_medres34_bn170405777.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 144.95,21.92 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:40:14 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      73
TRIGGER_NUM:     513110367
GRB_RA:          213.650d {+14h 14m 36s} (J2000),
                 213.899d {+14h 15m 36s} (current),
                 212.930d {+14h 11m 43s} (1950)
GRB_DEC:         -27.567d {-27d 34' 00"} (J2000),
                 -27.647d {-27d 38' 47"} (current),
                 -27.334d {-27d 20' 01"} (1950)
GRB_ERROR:       5.45 [deg radius, statistical plus systematic]
GRB_INTEN:       609 [cnts/sec]
DATA_SIGNIF:     54.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67162.89 SOD {18:39:22.89} UT
GRB_PHI:         183.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.55
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 1,0,0, 0,0,
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 32"}
SUN_DIST:        152.10 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:      133.35d {+08h 53m 24s}  +15.52d {+15d 31' 19"}
MOON_DIST:        89.09 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      324.66, 31.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      220.70,-13.25 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170405777/quicklook/glg_lc_medres34_bn170405777.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 144.95,21.92 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:40:21 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      93
TRIGGER_NUM:     513110367
GRB_RA:          213.650d {+14h 14m 36s} (J2000),
                 213.899d {+14h 15m 36s} (current),
                 212.930d {+14h 11m 43s} (1950)
GRB_DEC:         -27.567d {-27d 34' 00"} (J2000),
                 -27.647d {-27d 38' 47"} (current),
                 -27.334d {-27d 20' 01"} (1950)
GRB_ERROR:       4.38 [deg radius, statistical plus systematic]
GRB_INTEN:       890 [cnts/sec]
DATA_SIGNIF:     81.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67162.89 SOD {18:39:22.89} UT
GRB_PHI:         183.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.64
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 1,0,0, 0,0,
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 33"}
SUN_DIST:        152.10 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:      133.35d {+08h 53m 24s}  +15.52d {+15d 31' 19"}
MOON_DIST:        89.08 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      324.66, 31.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      220.70,-13.25 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170405777/quicklook/glg_lc_medres34_bn170405777.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 144.95,21.92 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 05 Apr 17 18:40:49 UT 
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    7803,   Sub_Num: 0
GRB_INTEN:      9.45 [sigma]   
GRB_TIME:       67168.86 SOD {18:39:28.86} UT
GRB_DATE:       17848 TJD;    95 DOY;   17/04/05
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(20.0<100sec) coincident with the SWIFT_BAT event (trignum=745797).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2017-04/2017-04-05T18-39-28.6881-12824-23440-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:42:20 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     745797,   Seg_Num: 0
GRB_RA:          219.8289d {+14h 39m 18.93s} (J2000),
                 220.0792d {+14h 40m 19.00s} (current),
                 219.1053d {+14h 36m 25.28s} (1950)
GRB_DEC:         -25.2438d {-25d 14' 37.6"} (J2000),
                 -25.3175d {-25d 19' 02.8"} (current),
                 -25.0289d {-25d 01' 43.9"} (1950)
GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.47e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.63 [sigma]
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67309.03 SOD {18:41:49.03} UT,   120.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.22 261.62 243.71
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 34"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.37d {+08h 53m 28s}  +15.52d {+15d 31' 06"}
MOON_DIST:        93.69 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      225.27, -9.26 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.01 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:42:44 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     745797,   Seg_Num: 0
GRB_RA:          219.8289d {+14h 39m 18.9s} (J2000),
                 220.0792d {+14h 40m 19.0s} (current),
                 219.1053d {+14h 36m 25.2s} (1950)
GRB_DEC:         -25.2438d {-25d 14' 37.6"} (J2000),
                 -25.3175d {-25d 19' 02.8"} (current),
                 -25.0289d {-25d 01' 43.9"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       113 [cnts]
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67309.03 SOD {18:41:49.03} UT,   120.6 [sec] since BAT Trigger Time
CENTROID_X:      319.00,  raw= 319  [pixels]
CENTROID_Y:      302.76,  raw= 303  [pixels]
ROLL:            124.16 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   10.30
GRB_POS_XRT_Z:   29.71
IMAGE_URL:       sw00745797000msxps_rw.img
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 35"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.37d {+08h 53m 29s}  +15.52d {+15d 31' 04"}
MOON_DIST:        93.69 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      225.27, -9.26 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:42:40 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     745797,   Seg_Num: 0
GRB_RA:          219.8289d {+14h 39m 18.9s} (J2000),
                 220.0792d {+14h 40m 19.0s} (current),
                 219.1053d {+14h 36m 25.2s} (1950)
GRB_DEC:         -25.2438d {-25d 14' 37.6"} (J2000),
                 -25.3175d {-25d 19' 02.8"} (current),
                 -25.0289d {-25d 01' 43.9"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       113 [cnts]
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67309.03 SOD {18:41:49.03} UT,   120.6 [sec] since BAT Trigger Time
CENTROID_X:      319.00,  raw= 319  [pixels]
CENTROID_Y:      302.76,  raw= 303  [pixels]
ROLL:            124.16 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   10.30
GRB_POS_XRT_Z:   29.71
IMAGE_URL:       sw00745797000msxps_rw.img
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 35"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.37d {+08h 53m 29s}  +15.52d {+15d 31' 04"}
MOON_DIST:        93.69 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      225.27, -9.26 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:43:38 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     745797,   Seg_Num: 0
GRB_RA:          219.810d {+14h 39m 14s} (J2000),
                 220.060d {+14h 40m 15s} (current),
                 219.087d {+14h 36m 21s} (1950)
GRB_DEC:         -25.244d {-25d 14' 36"} (J2000),
                 -25.317d {-25d 19' 01"} (current),
                 -25.029d {-25d 01' 42"} (1950)
GRB_DATE:        17848 TJD;    95 DOY;   17/04/05
GRB_TIME:        67188.43 SOD {18:39:48.43} UT
TRIGGER_INDEX:   343
GRB_PHI:          77.77 [deg]
GRB_THETA:        41.39 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     57.53 [sigma]
IMAGE_SIGNIF:    9.82 [sigma]
LC_URL:          sw00745797000msb.lc
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 36"}
SUN_DIST:        149.38 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.38d {+08h 53m 31s}  +15.52d {+15d 30' 58"}
MOON_DIST:        93.67 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.68, 31.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.25, -9.26 [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 = 127.88,-13.09 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:44:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.834d {+14h 39m 20s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 01"} (J2000)
POINT_ROLL:      124.156d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67317.26 SOD {18:41:57.26} UT,   128.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.488
N_STARS:         73
X_OFFSET:        352 [pixels]
Y_OFFSET:        680 [pixels]
X_MAX:           1311 [pixels]
Y_MAX:           1639 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00745797000msufc0128.fits
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 37"}
SUN_DIST:        149.35 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.39d {+08h 53m 34s}  +15.51d {+15d 30' 50"}
MOON_DIST:        93.68 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:45:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.834d {+14h 39m 20s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 01"} (J2000)
POINT_ROLL:      124.156d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67317.26 SOD {18:41:57.26} UT,   128.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.488
N_STARS:         73
X_OFFSET:        352 [pixels]
Y_OFFSET:        680 [pixels]
X_MAX:           1311 [pixels]
Y_MAX:           1639 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00745797000msufc0128.fits
SUN_POSTN:        14.90d {+00h 59m 36s}   +6.36d {+06d 21' 37"}
SUN_DIST:        149.35 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.40d {+08h 53m 36s}  +15.51d {+15d 30' 46"}
MOON_DIST:        93.67 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:46:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.834d {+14h 39m 20s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 01"} (J2000)
ROLL:            124.156d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67317.26 SOD {18:41:57.26} UT,   128.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     513110536
X_OFFSET:        725 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       885
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00745797000msuni0147.fits
SUN_POSTN:        14.90d {+00h 59m 37s}   +6.36d {+06d 21' 38"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.41d {+08h 53m 38s}  +15.51d {+15d 30' 39"}
MOON_DIST:        93.66 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [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:     Wed 05 Apr 17 18:46:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.834d {+14h 39m 20s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 01"} (J2000)
ROLL:            124.156d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67317.26 SOD {18:41:57.26} UT,   128.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     513110536
X_OFFSET:        725 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       885
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00745797000msuni0147.fits
SUN_POSTN:        14.90d {+00h 59m 37s}   +6.36d {+06d 21' 38"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.41d {+08h 53m 38s}  +15.51d {+15d 30' 41"}
MOON_DIST:        93.66 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [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:     Wed 05 Apr 17 18:48:16 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     745797,   Seg_Num: 0
GRB_RA:          219.8280d {+14h 39m 18.72s} (J2000),
                 220.0783d {+14h 40m 18.79s} (current),
                 219.1045d {+14h 36m 25.06s} (1950)
GRB_DEC:         -25.2431d {-25d 14' 35.1"} (J2000),
                 -25.3168d {-25d 19' 00.3"} (current),
                 -25.0282d {-25d 01' 41.4"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         16.18 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67314.00 SOD {18:41:54.00} UT,   125.6 [sec] since BAT Trigger Time
SUN_POSTN:        14.90d {+00h 59m 37s}   +6.36d {+06d 21' 40"}
SUN_DIST:        149.37 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.42d {+08h 53m 42s}  +15.51d {+15d 30' 29"}
MOON_DIST:        93.64 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.27, -9.25 [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 4.0 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:49:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.837d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
POINT_ROLL:      124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67475.18 SOD {18:44:35.18} UT,   286.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.718
N_STARS:         49
X_OFFSET:        405 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1364 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00745797000msufc0286.fits
SUN_POSTN:        14.90d {+00h 59m 37s}   +6.36d {+06d 21' 41"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.43d {+08h 53m 44s}  +15.51d {+15d 30' 22"}
MOON_DIST:        93.64 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:49:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.837d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
POINT_ROLL:      124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67475.18 SOD {18:44:35.18} UT,   286.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.718
N_STARS:         49
X_OFFSET:        405 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1364 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00745797000msufc0286.fits
SUN_POSTN:        14.90d {+00h 59m 37s}   +6.36d {+06d 21' 41"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.44d {+08h 53m 45s}  +15.51d {+15d 30' 21"}
MOON_DIST:        93.64 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:50:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.837d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
ROLL:            124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67475.18 SOD {18:44:35.18} UT,   286.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     513110694
X_OFFSET:        725 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       885
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00745797000msuni0305.fits
SUN_POSTN:        14.90d {+00h 59m 37s}   +6.36d {+06d 21' 42"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.45d {+08h 53m 47s}  +15.50d {+15d 30' 15"}
MOON_DIST:        93.63 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [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:     Wed 05 Apr 17 18:50:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.837d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
ROLL:            124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67475.18 SOD {18:44:35.18} UT,   286.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     513110694
X_OFFSET:        725 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       885
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00745797000msuni0305.fits
SUN_POSTN:        14.91d {+00h 59m 37s}   +6.36d {+06d 21' 42"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.45d {+08h 53m 48s}  +15.50d {+15d 30' 12"}
MOON_DIST:        93.63 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [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 #20984
E. Troja (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), S. B. Cenko (GSFC), A. Cholden-Brown (PSU), A. D'Ai (INAF-IASFPA), F. E. Marshall (NASA/GSFC) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 18:39:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170405A (trigger=745797). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 219.810, -25.244, which is
```
   RA(J2000)  =  14h 39m 14s
   Dec(J2000) = -25d 14' 36"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a duration of about 180 sec. The peak count rate was ~4500 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 18:41:49.0 UT, 120.6 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 219.8290, -25.2438 which is equivalent to:
```
   RA(J2000)  = +14h 39m 18.96s
   Dec(J2000) = -25d 14' 37.7"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 61 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 128 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	14:39:18.72 = 219.82800
  DEC(J2000) = -25:14:35.3  = -25.24315
```
with a 90%-confidence error radius of about 0.61 arc sec. This position is 3.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 16.18 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is E. Troja (eleonora.troja AT 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:     Wed 05 Apr 17 18:56:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.836d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
POINT_ROLL:      124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  68053.22 SOD {18:54:13.22} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.637
N_STARS:         146
X_OFFSET:        165 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1604 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00745797000msufc0864.fits
SUN_POSTN:        14.91d {+00h 59m 38s}   +6.36d {+06d 21' 48"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.51d {+08h 54m 01s}  +15.49d {+15d 29' 34"}
MOON_DIST:        93.57 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:57:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.836d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
POINT_ROLL:      124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  68053.22 SOD {18:54:13.22} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.637
N_STARS:         146
X_OFFSET:        165 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1604 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00745797000msufc0864.fits
SUN_POSTN:        14.91d {+00h 59m 38s}   +6.36d {+06d 21' 48"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.51d {+08h 54m 02s}  +15.49d {+15d 29' 33"}
MOON_DIST:        93.57 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:57:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     745797,   Seg_Num: 0
GRB_RA:          219.8281d {+14h 39m 18.74s} (J2000),
                 220.0784d {+14h 40m 18.81s} (current),
                 219.1045d {+14h 36m 25.09s} (1950)
GRB_DEC:         -25.2437d {-25d 14' 37.3"} (J2000),
                 -25.3174d {-25d 19' 02.5"} (current),
                 -25.0288d {-25d 01' 43.5"} (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:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  67821.00 SOD {18:50:21.00} UT,   632.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        14.91d {+00h 59m 38s}   +6.36d {+06d 21' 49"}
SUN_DIST:        149.37 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.51d {+08h 54m 03s}  +15.49d {+15d 29' 31"}
MOON_DIST:        93.56 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.53 [deg] galactic lon,lat of the burst
ECL_COORDS:      225.27, -9.26 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:58:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.836d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
ROLL:            124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  68053.22 SOD {18:54:13.22} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     513111272
X_OFFSET:        724 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       884
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00745797000msuni0883.fits
SUN_POSTN:        14.91d {+00h 59m 38s}   +6.36d {+06d 21' 50"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.52d {+08h 54m 06s}  +15.49d {+15d 29' 22"}
MOON_DIST:        93.56 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Apr 17 18:59:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     745797,   Seg_Num: 0
POINT_RA:        219.836d {+14h 39m 21s} (J2000)
POINT_DEC:       -25.251d {-25d 15' 04"} (J2000)
ROLL:            124.155d
IMG_START_DATE:  17848 TJD;    95 DOY;   17/04/05
IMG_START_TIME:  68053.22 SOD {18:54:13.22} UT,   864.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     513111272
X_OFFSET:        724 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       884
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00745797000msuni0883.fits
SUN_POSTN:        14.91d {+00h 59m 38s}   +6.36d {+06d 21' 50"}
SUN_DIST:        149.36 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:      133.53d {+08h 54m 06s}  +15.49d {+15d 29' 21"}
MOON_DIST:        93.55 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.70, 31.52 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      225.28, -9.26 [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 #20985
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 368 s of XRT Photon Counting mode data and 1 UVOT images for GRB 170405A, 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 = 219.82767, -25.24368 which is equivalent to:
```
RA (J2000): 14h 39m 18.64s
Dec (J2000): -25d 14' 37.3"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #20986
C. M. Hui (MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
At 18:39:22.89 UT on 05 April 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170405A (trigger 513110367/170405777), which was also detected by Swift (Troja et al. 2017, GCN 20984). The GBM on-ground location is consistent with the Swift position.
The trigger resulted in an Autonomous Repoint Request (ARR) by the GBM Flight Software owing to the high peak flux of the GRB. This ARR was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight is 52 degrees.
The GBM light curve shows multiple peaks with a duration (T90) of about 78.6 s (50-300 keV). The time-averaged spectrum from T0+7.2 s to T0+86.0 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.01 +/- 0.01 and the cutoff energy, parameterized as Epeak, is 355.2 +/- 8.6 keV.
The event fluence (10-1000 keV) in this time interval is (7.85 +/- 0.07)E-05 erg/cm^2. The 1s peak photon flux measured starting from T0+29.5 s in the 10-1000 keV band is 15.8 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.
GCN Circular #20987
G.Vianello (Stanford), D.Kocevski (NASA/MSFC)
report on behalf of the Fermi-LAT team:
At 18:39:22.89 on April, 05, 2017 Fermi-LAT detected high-energy emission from GRB 170405A, which was also detected by Swift (Troja et al., GCN 20984) and Fermi/GBM (trigger 513110367/170405777).
The best LAT on-ground location is found to be:
RA, Dec = 219.37, -25.23 (J2000)
with an error radius of 0.51 deg (90 % containment, statistical error only). This was 53 deg from the LAT boresight at the time of the trigger and triggered an autonomous repoint of the spacecraft. This position is compatible with the XRT position reported by Evans et al. (GCN 20985).
The data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the trigger with high significance. More than 13 events have been observed above 100 MeV which are spatially and temporally correlated with the GRB. The highest-energy photon is a 900 MeV event which is observed 445 seconds after the GBM trigger.
We note that roughly 5 ks of data are currently available. We will provide an update, if necessary, as more data become available.
The Fermi-LAT point of contact for this burst is Giacomo Vianello (giacomov@stanford.edu)
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #20988
Daniele Malesani (DARK/NBI), K. E. Heintz (DARK/NBI and Univ. Iceland), and Tapio Pursimo (NOT) report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 170405A (Troja et al., GCN 20984; Hui & Meegan, GCN 20986; Vianello & Kocevski, GCN 20987) with the Nordic Optical Telescope (NOT) equipped with the ALFOSC imager. Observations were carried out in the SDSS griz filters, with a sub-optimal PSF (1.6-2.0").
Inspection of the r-band image (with mean time Apr 6.01 UT, that is 5.47 hr after the trigger) clearly shows the optical afterglow first localized by UVOT (Troja et al., GCN 20984), which has now faded to r = 21.05 +- 0.08 AB, calibrated against nearby stars from the Pan-STARRS catalog. In our images, the afterglow coordinates are perfectly consistent with the UVOT values:
```
RA(J2000) = 14:39:18.72
Dec(J2000) = -25:14:35.3
```
We also note the presence of a nearby object approximately 2.3" W of the afterglow, also visible in the Pan-STARRS archival images (with a Pan-STARRS magnitude r = 21.82 +- 0.19 AB). Its relation to the GRB is not clear, but its proximity may affect the afterglow photometry.
GCN Circular #20989
Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Laugier, R. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.) Thierry P. (Auragne Observatory, France), Klotz A.N.O. (Guitalens Observatory, France) report:
We imaged the field of GRB 170405A detected by SWIFT (trigger 745797) with the TAROT robotic telescope (D=18cm) located at the Reunion observatory, France.
The observations started 3.84h after the GRB trigger. We detected the OT (Troja et al., GCN 20984; Hui & Meegan, GCN 20986; Vianello & Kocevski, GCN 20987; Malesani, GCNC 20988):
t0+3.84h to t0+3.97h : R=19.0 +/- 0.2
Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
GCN Circular #20990
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D.A. Kann (IAA-CSIC), C.C. Thoene (IAA-CSIC), L. Izzo (IAA-CSIC), N.R. Tanvir (U. Leicester), G. Lombardi (GTC, IAC), and A. Marante (GTC) report on behalf of a larger collaboration:
We observed the field of GRB 170405A (Troja et al., GCN 20984; Hui & Meegan, GCN 20986; Vianello & Kocevski, GCN 20987) using OSIRIS on the 10.4m GTC at the Roque de los Muchachos observatory (La Palma, Spain). The observation consisted of 3x900s using the R1000B grism, covering the range between 3700 and 7800 =C5. The first spectrum started at 2:14 UT (7.57 hr after the burst).
On a preliminary reduction based on archival calibrations we detect a spectral continuum with strong absorption features, which we identify as due to Ly-alpha, SiII, OI, CII, SiIV, CIV, FeII and AlII at a common redshift of z = 3.510, which we identify as the redshift of the GRB.
GCN Circular #20991
A. Martin-Carrillo (UCD), D. Murphy (UCD), L. Hanlon (UCD), H. J. van Heerden (UFS), B. van Soelen (UFS) and P. J. Meintjes (UFS)
We observed the field of GRB 170405A (Troja et al, GCN 20984; Hui & Meegan, GCN 20986; Vianello & Kocevski, GCN 20987) using the 40cm UCD Watcher telescope at Boyden Observatory in South Africa.
Due to bad weather observations started at 19:31:13 UT, about 51.4 minutes after the burst trigger (T0=3D18:39:48 UT). A faint source consistent with the UVOT coordinates reported by Troja et al. is detected on our combined images taken with the SDSS r=E2=80=99 filter. At a mid-time of 20:00 UT, we derive a preliminary magnitude of r=E2=80=99=3D18.0 (AB system), confirming that the source has faded since the UVOT detection.
Magnitudes were calibrated using several nearby APASS stars. No correction for Galactic extinction in the direction of the GRB has been applied.
GCN Circular #20992
E. Mazaeva (IKI), V. Agletdinov (KIAM), A. Pozanenko (IKI), A. Volnova (IKI), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 170405A (Troja et al., GCN 20984) with K-800 (0.8m) telescope of ISON/Terskol observatory starting on April, 05 (UT) 19:12:55, i.e. 45 minutes after GRB onset. We obtained several unfiltered images of 15 s exposure. The optical afterglow Troja et al., GCN 20984; Malesani et al., GCN 20988; Klotz et al., GCN 20989; Ugarte Postigo et al., GCN 20990; Martin-Carrillo et al., GCN 20991) is clearly visible in combined images. Preliminary photometry of the afterglow is following
```
Date       UT start   t-T0    Filter  Exp.   OT     Err.  UL
                       (mid, days)     (s)

2017-04-05 19:12:55 0.03139 CR 72*15  17.27 0.10 20.1
2017-04-05 19:34:33 0.04300 CR 48*15  17.96 0.13 19.8
2017-04-05 19:49:05 0.06019 CR 110*15 18.39 0.14 20.4
2017-04-05 20:23:55 0.08543 CR 110*15 19.18 0.22 20.2
2017-04-05 21:01:48 0.11099 CR 107*15  n/d n/d   18.9
```
Photometry is based on nearby USNO-B1.0 stars
```
USNO-B.1_id     R2
0647-0315771    15.13
0647-0315754    15.45
0647-0315872    15.34
0647-0315921    15.08
0647-0315788    14.92
```
Preliminary light curve of the afterglow can be found in http://grb.rssi.ru/GRB170405A/GRB170405A_light_curve.png
GCN Circular #20994
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 170405A (Troja et al. GCN 20984) on April 06, from 10:23 to 11:01 UT (0.66 to 0.68 days since the GRB) with the 2-m LCO Faulkes Telescope North with the SDSS i and r filters. We do not detect the optical afterglow (Troja et al; Malesani et al. GCN 20988; Klotz et al. GCN 20989; de Ugarte Postigo et al. GCN 20990; Martin-Carrillo et al. GCN 20991; Mazaeva et al. GCN 20992) down to the following limits:
```
Mid Time      Exposure       Filter       Magnitude (AB)
(days)           (s)
-------------------------------------------------------
0.66           5x120          SDSS-R        > 21.6
0.68           4x120          SDSS-I        > 21.6
-------------------------------------------------------
```
as calibrated against nearby Pan-STARRS objects. The nearby Pan-STARRS object mentioned by Malesani et al. is clearly visible in our stacked frames.
GCN Circular #20995
D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 170405A (Swift-BAT detection: Troja et al.,GCN 20984; Fermi-GBM detection: Hui & Meegan., GCN 20986; Fermi-LAT detection: Vianello & Kocevski, GCN 20827) triggered Konus-Wind at T0=3D67181.254 s UT (18:39:41.254)
The light curve shows a multi-peaked structure with a total duration of ~100 s and a hint of a subsequent weak/soft emission lasting until ~T0+200 s. The emission is seen up to ~10 MeV.
As observed by Konus-Wind, the burst had a fluence of (1.05 =B1 0.12)x10^-4 erg/cm2 and a 64-ms peak energy flux, measured from T0+15.744, of (5.9 =B1 0.9)x10^-6 erg/cm2 (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+73.984 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -0.53 (-0.17,+0.19), the high energy photon index beta =3D -2.36 (-0.25,+0.15), the peak energy Ep =3D 244 (-27,+32) keV, chi2 =3D 98/96 dof.
The spectrum near the peak count rate (measured from T0+8.448 s to T0+24.832 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -0.54 (-0.22,+0.24), the high energy photon index beta =3D -2.56 (-1.02,+0.27), the peak energy Ep =3D 265 (-36,+51) keV, chi2 =3D 71/96 dof.
Assuming the redshift z=3D3.510 (de Ugarte Postigo et al., GCN 20104) and a standard cosmology model with H_0 =3D 70 km/s/Mpc, Omega_M =3D 0.3, and Omega_Lambda =3D 0.7, we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~2.6x10^54 erg, the peak luminosity L_iso is ~6.6x10^53 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is ~1100 keV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB170405_T67181/
All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.
GCN Circular #20996
Eleonora Troja (GSFC), 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), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz=20 (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of GRB 170405A (Troja, et al., GCN 20984) 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 2017/04 6.23 to 2017/04 6.48 UTC (10.93 to 16.85 hours after the BAT trigger), obtaining a total of 3.84 hours exposure in the r and i bands and 1.62 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-UVOT error circle (Troja, et al., GCN 20984), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following detections:
```
   r    22.67 +/- 0.05
   i    21.83 +/- 0.04
   Z    21.26 +/- 0.07
   Y    21.14 +/- 0.07
   J    20.75 +/- 0.07
   H    20.56 +/- 0.08
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
The nearby object noted by Malesani et al., (GCN 20988) is detected in all our images and might affect our photometric measurements. The reported values should be therefore considered as preliminary.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
Further observations are planned.
GCN Circular #20997
K.L. Page (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Cholden-Brown (PSU), S. J. LaPorte (PSU), J.A. Kennea (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 6.5 ks of XRT data for GRB 170405A, from 111 s to 57.3 ks after the BAT trigger. The data comprise 489 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode.
The late-time light curve (from T0+4.5 ks) can be modelled with a power-law decay with a decay index of alpha=1.66 (+0.14, -0.12).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.592 (+0.027, -0.019). The best-fitting absorption column is consistent with the Galactic value of 8.7 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.84 (+0.09, -0.07) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 8.7 x 10^20 cm^-2
Intrinsic column:    8.7 (+68.1, -0.0) x 10^20 cm^-2 at z=3.51
Photon index:	     1.84 (+0.09, -0.07)
```
If the light curve continues to decay with a power-law decay index of 1.66, the count rate at T+24 hours will be 5.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.0 x 10^-13 (2.3 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00745797.
This circular is an official product of the Swift-XRT team.
GCN Circular #20998
B. Gendre (UVI), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (UVI), A. Cucchiara (UVI), D. Drost (UVI), T. Giblin (USAF Academy), J. Hakkila (College of Charleston), A. Klotz (IRAP), J. Neff (NSF), D. Smith (UVI), J. Staff (UVI), P. Thierry (Auragne Observatory), R. Watlington (UVI), and L. Wentlent (UVI) report:
We observed the field of GRB 170405A (Troja et al, GCN 20984; Hui & Meegan, GCN 20986; Vianello & Kocevski, GCN 20987) with the 0.5m Virgin Island Robotic Telescope (VIRT) on February the 6th, starting at 6:15 UT (11.6 hours after the trigger). We performed a series of exposures in the clear filter. The weather conditions were good during the observations.
We co-added the exposures taken between 6h15UT (t0+11.6h) and 7h29UT (t0+12.8h), for a total exposure of 3510s. At the position of the optical afterglow reported by Malesani et al. (GCN 20988), we do not detect any optical emission, with an upper limit of R = 21.3 (Johnson system) estimated from nearby NOMAD1 stars.
Magnitudes have not been corrected for Galactic extinction. The VIRT is still in its commissioning phase.
This message can be cited.
GCN Circular #20999
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry down= link, we report further analysis of BAT GRB 170405A (trigger #745797) (Troja et al., GCN Circ. 20984). The BAT ground-calculated position is RA, Dec =3D 219.824, -25.236 deg which is
```
   RA(J2000)  =3D  14h 39m 17.8s
   Dec(J2000) =3D -25d 14' 09.7"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 6%.
The burst was outside of the BAT calibrated field of view from T-134.3 s = to T+56.7 s. The mask-weighted light curve using the =E2=80=9Cdetection mask=E2=80=9D = (which covers a broader field of view, but is not well calibrated; see detail description in Mark= wardt et al. 2007) shows a multi-peaked structure that starts at ~T-30 s and ends at ~T+240 = s. The major peak occurs at ~T+5 s. T90 (15-350 keV) is 164.7 +- 35.4 sec (estim= ated error including systematics).
The time-averaged spectrum from T+56.7 to T+242.5 sec (i.e., when the bur= st is in the BAT calibrated field of view) is best fit by a simple power-law model. T= he power law index of the time-averaged spectrum is 1.59 +- 0.12. The fluence in the = 15-150 keV band is 3.7 +- 0.3 x 10^-06 erg/cm2. 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/745797/BA/
GCN Circular #21000
GRB 170405A: Swift/UVOT Detection
S. J. LaPorte (PSU) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170405A 129 s after the BAT trigger (Troja et al., GCN Circ. 20984). Consistent with previous reports (Malesani et al, GCN Circ. 20988; Martin-Carrillo et al. GCN Circ. 20991), a fading source consistent with the XRT position (Evans et al. GCN Circ. 20985) is detected in the initial UVOT exposures at:
```
    RA  (J2000) =  14:39:18.73 = 219.82805 (deg.)
    Dec (J2000) = -25:14:35.4  = -25.24317 (deg.)
```
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
The upper limits in the UV bands are consistent with the reported redshift of z = 3.51 (de Ugarte-Postigo et al, GCN Circ. 20990).
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)         129          279          147         16.01 +/- 0.03
white              747          998          143         18.09 +/- 0.07
v                  618          637           20         16.31 +/- 0.14
b                  543          563           20         17.34 +/- 0.13
u                  287          711          265        >20.2
uvw1               667          859           39        >18.9
uvm2               815          835           19        >17.5
uvw2               593          786           39        >19.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #21003
B. E. Cobb (GWU), reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 170405A (GCN 20984, Troja et al.) at two epochs (with mid-exposure times of 2017-04-06 02:51 UT & 06:52 UT). For each epoch, several dithered images were obtained with total summed exposure times of 15 min in V and I and 12 min in J and K.
The fading afterglow of GRB 170405A (e.g. GCN 20984, Troja et al.; GCN 20988, Malesani et al.; GCN 20989, Klotz et al.) was detected with the preliminary magnitudes (or 3-sigma limits) listed below. Note that the optical photometry is calibrated against USNO-B1.0 stars in the field, so suffers from a large photometric calibration error of about +/-0.2 magnitudes, which has not been included in the errors quoted below. The IR photometry is calibrated against 2MASS stars. Additionally, the nearby source noted by Malesani et al. (GCN 20988) is seen and is likely affecting the afterglow photometry due to its proximity.
```
mid-exposure
time post-burst
(hours)     I mag          J mag     K mag
8.19000    20.4+/-0.1   >18.5     >16.9
12.1975    21.1+/-0.1   >18.8     >16.8
```

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Jochen Greiner, last update: 09-Apr-2017 [Disclaimer]