Gamma-ray Burst 160607A

(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:     Tue 07 Jun 16 11:14:21 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     689597,   Seg_Num: 0
GRB_RA:           13.663d {+00h 54m 39s} (J2000),
                  13.872d {+00h 55m 29s} (current),
                  13.028d {+00h 52m 07s} (1950)
GRB_DEC:          -4.948d {-04d 56' 52"} (J2000),
                  -4.859d {-04d 51' 32"} (current),
                  -5.219d {-05d 13' 07"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       13225 [cnts]    Image_Peak=2295 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       23881 [cnts]
BKG_TIME:        40423.61 SOD {11:13:43.61} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17546 TJD;   159 DOY;   16/06/07
GRB_TIME:        40440.83 SOD {11:14:00.83} UT
GRB_PHI:          -4.91 [deg]
GRB_THETA:        27.80 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     172.84 [sigma]
IMAGE_SIGNIF:    24.09 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +8  +0  +0 -39  +0 
SUN_POSTN:        76.02d {+05h 04m 06s}  +22.81d {+22d 48' 53"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.77d {+07h 19m 05s}  +17.90d {+17d 54' 09"}
MOON_DIST:        97.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.05,-67.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       10.62, -9.95 [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 = 287.02,18.10 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/CALET NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:14:36 UT 
NOTICE_TYPE:     CALET GBM Flight Lightcurve
POINT_RA:        296.03d {+19h 44m 07s} (J2000),
POINT_DEC:       -12.11d {-12d 06' 20"} (J2000),
TRIGGER_NUM:     1149333220    
TRIGGER_DATE:    17546 TJD;   159 DOY;   16/06/07
TRIGGER_TIME:    40437.49 SOD {11:13:57.49} UT
TRIGGER_DET:     0 0 1 (HXM1 HXM2 SGM)
SIGNIFICANCE:    9.40 [sigma]  
FOREGND_DUR:     4.00 [sec]    
BACKGND_DUR1:    16.00 [sec]   
ENERGY_BAND:     40-230 [keV]
SC_LON_LAT:      231.47,-12.06 [deg]
LC_URL:          http://cgbm.calet.jp/cgbm_trigger/flight//1149333220/index.html
COMMENTS:        CALET-GBM Flight Lightcurve.
COMMENTS:
COMMENTS:        NOTE: This CALET_GBM_FLT_LC event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=689597).
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 07 Jun 16 11:15:05 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    7487,   Sub_Num: 0
GRB_INTEN:      9.16 [sigma]   
GRB_TIME:       40437.64 SOD {11:13:57.64} UT
GRB_DATE:       17546 TJD;   159 DOY;   16/06/07
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(0.0<100sec) coincident with the CALET event (trignum=1149333220).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2016-06/2016-06-07T11-13-57.6182-22310-23440-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:15:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     689597,   Seg_Num: 0
GRB_RA:           13.6655d {+00h 54m 39.71s} (J2000),
                  13.8742d {+00h 55m 29.80s} (current),
                  13.0307d {+00h 52m 07.36s} (1950)
GRB_DEC:          -4.9481d {-04d 56' 53.1"} (J2000),
                  -4.8592d {-04d 51' 33.2"} (current),
                  -5.2190d {-05d 13' 08.3"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.72e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.42 [sigma]
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40516.30 SOD {11:15:16.30} UT,   75.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.19 261.68 243.64
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        76.02d {+05h 04m 06s}  +22.81d {+22d 48' 53"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.79d {+07h 19m 09s}  +17.90d {+17d 54' 04"}
MOON_DIST:        97.11 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.06,-67.81 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.13 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:16:09 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     689597,   Seg_Num: 0
GRB_RA:           13.6655d {+00h 54m 39.7s} (J2000),
                  13.8742d {+00h 55m 29.8s} (current),
                  13.0307d {+00h 52m 07.3s} (1950)
GRB_DEC:          -4.9481d {-04d 56' 53.1"} (J2000),
                  -4.8592d {-04d 51' 33.2"} (current),
                  -5.2190d {-05d 13' 08.3"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       71 [cnts]
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40516.30 SOD {11:15:16.30} UT,   75.5 [sec] since BAT Trigger Time
CENTROID_X:      310.49,  raw= 310  [pixels]
CENTROID_Y:      297.71,  raw= 298  [pixels]
ROLL:            62.62 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -0.20
GRB_POS_XRT_Z:   12.24
IMAGE_URL:       sw00689597000msxps_rw.img
SUN_POSTN:        76.02d {+05h 04m 06s}  +22.81d {+22d 48' 53"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.79d {+07h 19m 09s}  +17.90d {+17d 54' 03"}
MOON_DIST:        97.11 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.06,-67.81 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:16:03 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     689597,   Seg_Num: 0
GRB_RA:           13.6655d {+00h 54m 39.7s} (J2000),
                  13.8742d {+00h 55m 29.8s} (current),
                  13.0307d {+00h 52m 07.3s} (1950)
GRB_DEC:          -4.9481d {-04d 56' 53.1"} (J2000),
                  -4.8592d {-04d 51' 33.2"} (current),
                  -5.2190d {-05d 13' 08.3"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       71 [cnts]
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40516.30 SOD {11:15:16.30} UT,   75.5 [sec] since BAT Trigger Time
CENTROID_X:      310.49,  raw= 310  [pixels]
CENTROID_Y:      297.71,  raw= 298  [pixels]
ROLL:            62.62 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -0.20
GRB_POS_XRT_Z:   12.24
IMAGE_URL:       sw00689597000msxps_rw.img
SUN_POSTN:        76.02d {+05h 04m 06s}  +22.81d {+22d 48' 53"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.79d {+07h 19m 09s}  +17.90d {+17d 54' 04"}
MOON_DIST:        97.11 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.06,-67.81 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:17:54 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     689597,   Seg_Num: 0
GRB_RA:           13.663d {+00h 54m 39s} (J2000),
                  13.872d {+00h 55m 29s} (current),
                  13.028d {+00h 52m 07s} (1950)
GRB_DEC:          -4.948d {-04d 56' 52"} (J2000),
                  -4.859d {-04d 51' 32"} (current),
                  -5.219d {-05d 13' 07"} (1950)
GRB_DATE:        17546 TJD;   159 DOY;   16/06/07
GRB_TIME:        40440.83 SOD {11:14:00.83} UT
TRIGGER_INDEX:   146
GRB_PHI:          -4.91 [deg]
GRB_THETA:        27.80 [deg]
DELTA_TIME:      38.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     172.84 [sigma]
IMAGE_SIGNIF:    24.09 [sigma]
LC_URL:          sw00689597000msb.lc
SUN_POSTN:        76.03d {+05h 04m 06s}  +22.81d {+22d 48' 53"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.81d {+07h 19m 14s}  +17.90d {+17d 53' 58"}
MOON_DIST:        97.13 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.05,-67.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       10.62, -9.95 [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 = 287.02,18.10 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:18:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.669d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.947d {-04d 56' 48"} (J2000)
POINT_ROLL:      62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40524.58 SOD {11:15:24.58} UT,   83.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.565
N_STARS:         11
X_OFFSET:        448 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00689597000msufc0083.fits
SUN_POSTN:        76.03d {+05h 04m 06s}  +22.81d {+22d 48' 54"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.82d {+07h 19m 16s}  +17.90d {+17d 53' 55"}
MOON_DIST:        97.13 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:19:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.669d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.947d {-04d 56' 48"} (J2000)
POINT_ROLL:      62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40524.58 SOD {11:15:24.58} UT,   83.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.565
N_STARS:         11
X_OFFSET:        448 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00689597000msufc0083.fits
SUN_POSTN:        76.03d {+05h 04m 07s}  +22.81d {+22d 48' 54"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.82d {+07h 19m 17s}  +17.90d {+17d 53' 53"}
MOON_DIST:        97.14 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:20:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.669d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.947d {-04d 56' 48"} (J2000)
ROLL:            62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40524.58 SOD {11:15:24.58} UT,   83.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     486990940
X_OFFSET:        780 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0100.fits
SUN_POSTN:        76.03d {+05h 04m 07s}  +22.81d {+22d 48' 54"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.83d {+07h 19m 19s}  +17.90d {+17d 53' 51"}
MOON_DIST:        97.14 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:20:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.669d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.947d {-04d 56' 48"} (J2000)
ROLL:            62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40524.58 SOD {11:15:24.58} UT,   83.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     486990940
X_OFFSET:        780 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0100.fits
SUN_POSTN:        76.03d {+05h 04m 07s}  +22.81d {+22d 48' 54"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.83d {+07h 19m 20s}  +17.90d {+17d 53' 50"}
MOON_DIST:        97.15 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:24:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
POINT_ROLL:      62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40737.08 SOD {11:18:57.08} UT,   296.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.295
N_STARS:         7
X_OFFSET:        460 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1419 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00689597000msufc0296.fits
SUN_POSTN:        76.03d {+05h 04m 08s}  +22.82d {+22d 48' 55"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.88d {+07h 19m 31s}  +17.89d {+17d 53' 35"}
MOON_DIST:        97.19 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:25:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
POINT_ROLL:      62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40737.08 SOD {11:18:57.08} UT,   296.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.295
N_STARS:         7
X_OFFSET:        460 [pixels]
Y_OFFSET:        579 [pixels]
X_MAX:           1419 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00689597000msufc0296.fits
SUN_POSTN:        76.03d {+05h 04m 08s}  +22.82d {+22d 48' 55"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.88d {+07h 19m 32s}  +17.89d {+17d 53' 34"}
MOON_DIST:        97.19 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #19502
T. N. Ukwatta (LANL), A. P. Beardmore (U Leicester), P.A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Swift Team:
At 11:14:00 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160607A (trigger=689597). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 13.663, -4.948 which is
```
   RA(J2000) = 00h 54m 39s
   Dec(J2000) = -04d 56' 52"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 70 sec. The peak count rate was ~33000 counts/sec (15-350 keV), at ~12 sec after the trigger.
The XRT began observing the field at 11:15:16.3 UT, 75.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 13.6655, -4.9481 which is equivalent to:
```
   RA(J2000)  = +00h 54m 39.72s
   Dec(J2000) = -04d 56' 53.2"
```
with an uncertainty of 5.2 arcseconds (radius, 90% containment). This location is 9.0 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.
The initial flux in the 2.5 s image was 1.72e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 83 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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:     Tue 07 Jun 16 11:26:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
ROLL:            62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40737.08 SOD {11:18:57.08} UT,   296.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     486991153
X_OFFSET:        780 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0313.fits
SUN_POSTN:        76.03d {+05h 04m 08s}  +22.82d {+22d 48' 55"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.89d {+07h 19m 34s}  +17.89d {+17d 53' 31"}
MOON_DIST:        97.20 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:26:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
ROLL:            62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  40737.08 SOD {11:18:57.08} UT,   296.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     486991153
X_OFFSET:        780 [pixels]
Y_OFFSET:        899 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1059
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0313.fits
SUN_POSTN:        76.03d {+05h 04m 08s}  +22.82d {+22d 48' 55"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.89d {+07h 19m 35s}  +17.89d {+17d 53' 30"}
MOON_DIST:        97.20 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.07,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:29:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
POINT_ROLL:      62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41315.28 SOD {11:28:35.28} UT,   874.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.155
N_STARS:         19
X_OFFSET:        220 [pixels]
Y_OFFSET:        339 [pixels]
X_MAX:           1659 [pixels]
Y_MAX:           1778 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00689597000msufc0874.fits
SUN_POSTN:        76.03d {+05h 04m 08s}  +22.82d {+22d 48' 56"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.93d {+07h 19m 43s}  +17.89d {+17d 53' 20"}
MOON_DIST:        97.24 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:29:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
POINT_ROLL:      62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41315.28 SOD {11:28:35.28} UT,   874.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.155
N_STARS:         19
X_OFFSET:        220 [pixels]
Y_OFFSET:        339 [pixels]
X_MAX:           1659 [pixels]
Y_MAX:           1778 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00689597000msufc0874.fits
SUN_POSTN:        76.03d {+05h 04m 08s}  +22.82d {+22d 48' 56"}
SUN_DIST:         66.66 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.93d {+07h 19m 43s}  +17.89d {+17d 53' 19"}
MOON_DIST:        97.24 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:31:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
ROLL:            62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41315.28 SOD {11:28:35.28} UT,   874.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     486991731
X_OFFSET:        779 [pixels]
Y_OFFSET:        898 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       939
Y_GRB_POS:       1058
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0891.fits
SUN_POSTN:        76.04d {+05h 04m 09s}  +22.82d {+22d 48' 56"}
SUN_DIST:         66.67 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.94d {+07h 19m 46s}  +17.89d {+17d 53' 16"}
MOON_DIST:        97.25 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:31:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 41"} (J2000)
ROLL:            62.618d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41315.28 SOD {11:28:35.28} UT,   874.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     486991731
X_OFFSET:        779 [pixels]
Y_OFFSET:        898 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       939
Y_GRB_POS:       1058
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0891.fits
SUN_POSTN:        76.04d {+05h 04m 09s}  +22.82d {+22d 48' 56"}
SUN_DIST:         66.67 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.94d {+07h 19m 46s}  +17.89d {+17d 53' 15"}
MOON_DIST:        97.25 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:32:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 40"} (J2000)
POINT_ROLL:      62.617d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41378.81 SOD {11:29:38.81} UT,   938.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.982
N_STARS:         12
X_OFFSET:        220 [pixels]
Y_OFFSET:        339 [pixels]
X_MAX:           1659 [pixels]
Y_MAX:           1778 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00689597000msufc0937.fits
SUN_POSTN:        76.04d {+05h 04m 09s}  +22.82d {+22d 48' 57"}
SUN_DIST:         66.67 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.96d {+07h 19m 50s}  +17.89d {+17d 53' 10"}
MOON_DIST:        97.27 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:33:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 40"} (J2000)
POINT_ROLL:      62.617d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41378.81 SOD {11:29:38.81} UT,   938.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.982
N_STARS:         12
X_OFFSET:        220 [pixels]
Y_OFFSET:        339 [pixels]
X_MAX:           1659 [pixels]
Y_MAX:           1778 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00689597000msufc0937.fits
SUN_POSTN:        76.04d {+05h 04m 09s}  +22.82d {+22d 48' 57"}
SUN_DIST:         66.67 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.96d {+07h 19m 51s}  +17.89d {+17d 53' 09"}
MOON_DIST:        97.27 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:34:08 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 40"} (J2000)
ROLL:            62.617d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41378.81 SOD {11:29:38.81} UT,   938.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     486991795
X_OFFSET:        779 [pixels]
Y_OFFSET:        898 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       939
Y_GRB_POS:       1058
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0954.fits
SUN_POSTN:        76.04d {+05h 04m 09s}  +22.82d {+22d 48' 57"}
SUN_DIST:         66.67 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.97d {+07h 19m 53s}  +17.88d {+17d 53' 06"}
MOON_DIST:        97.28 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [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:     Tue 07 Jun 16 11:34:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     689597,   Seg_Num: 0
POINT_RA:         13.668d {+00h 54m 40s} (J2000)
POINT_DEC:        -4.945d {-04d 56' 40"} (J2000)
ROLL:            62.617d
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41378.81 SOD {11:29:38.81} UT,   938.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     486991795
X_OFFSET:        779 [pixels]
Y_OFFSET:        898 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       939
Y_GRB_POS:       1058
BINNING_INDEX:   1
IM_URL:          sw00689597000msuni0954.fits
SUN_POSTN:        76.04d {+05h 04m 09s}  +22.82d {+22d 48' 57"}
SUN_DIST:         66.67 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      109.97d {+07h 19m 54s}  +17.88d {+17d 53' 05"}
MOON_DIST:        97.28 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      125.06,-67.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.63, -9.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 11:52:15 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     689597,   Seg_Num: 0
GRB_RA:           13.6663d {+00h 54m 39.91s} (J2000),
                  13.8750d {+00h 55m 29.99s} (current),
                  13.0315d {+00h 52m 07.55s} (1950)
GRB_DEC:          -4.9486d {-04d 56' 54.9"} (J2000),
                  -4.8597d {-04d 51' 35.0"} (current),
                  -5.2195d {-05d 13' 10.1"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41452.00 SOD {11:30:52.00} UT,   1011.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        76.05d {+05h 04m 12s}  +22.82d {+22d 49' 01"}
SUN_DIST:         66.68 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      110.16d {+07h 20m 38s}  +17.87d {+17d 52' 07"}
MOON_DIST:        97.46 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      125.06,-67.81 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.63, -9.95 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Jun 16 12:05:45 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     689597,   Seg_Num: 0
GRB_RA:           13.6663d {+00h 54m 39.91s} (J2000),
                  13.8750d {+00h 55m 29.99s} (current),
                  13.0315d {+00h 52m 07.55s} (1950)
GRB_DEC:          -4.9485d {-04d 56' 54.6"} (J2000),
                  -4.8596d {-04d 51' 34.7"} (current),
                  -5.2194d {-05d 13' 09.7"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17546 TJD;   159 DOY;   16/06/07
IMG_START_TIME:  41452.00 SOD {11:30:52.00} UT,   1011.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        76.06d {+05h 04m 15s}  +22.82d {+22d 49' 04"}
SUN_DIST:         66.69 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      110.29d {+07h 21m 10s}  +17.86d {+17d 51' 23"}
MOON_DIST:        97.59 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      125.06,-67.81 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.63, -9.95 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #19503
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 616 s of XRT Photon Counting mode data and 2 UVOT images for GRB 160607A, 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 = 13.66744, -4.94858 which is equivalent to:
```
RA (J2000): 00h 54m 40.19s
Dec (J2000): -04d 56' 54.9"
```
with an uncertainty of 1.5 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 #19504
D.N. Burrows (PSU), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and T.N. Ukwatta report on behalf of the Swift-XRT team:
We have analysed 7.1 ks of XRT data for GRB 160607A (Ukwatta et al. GCN Circ. 19502), from 65 s to 24.3 ks after the BAT trigger. The data comprise 935 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 19503).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.38 (+0.38, -0.21). At T+125 s the decay flattens to an alpha of 0.66 (+/-0.04) before breaking again at T+2142 s to a final decay with index alpha=1.25 (+0.08, -0.07).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.85 (+0.06, -0.05). The best-fitting absorption column is 1.87 (+0.23, -0.22) x 10^21 cm^-2, in excess of the Galactic value of 5.1 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.98 (+/-0.09) and a best-fitting absorption column of 2.3 (+/-0.3) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.3 (+/-0.3) x 10^21 cm^-2
Galactic foreground: 5.1 x 10^20 cm^-2
Excess significance: 9.0 sigma
Photon index:	     1.98 (+/-0.09)
```
If the light curve continues to decay with a power-law decay index of 1.25, the count rate at T+24 hours will be 0.048 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-12 (2.4 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00689597.
This circular is an official product of the Swift-XRT team.
GCN Circular #19506
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160607A (trigger #689597) (Ukwatta, et al., GCN Circ. 19502). The BAT ground-calculated position is RA, Dec = 13.661, -4.952 deg which is
```
    RA(J2000)  =  00h 54m 38.8s
    Dec(J2000) = -04d 57' 08.0"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 84%.
The mask-weighted light curve shows a complex structure of multiple peaks. The first complex begins at T-3 sec, peaks at T+12 and decays to baseline by T+24 sec. This is followed by another weaker peak from T+30 to T+36 sec and then very weak emission out to T+80 sec. T90 (15-350 keV) is 33.4 +- 0.45 sec (estimated error including systematics).
The time-averaged spectrum from T-13.89 to T+44.08 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.15 +- 0.10, and Epeak of 245.1 +- 92.7 keV (chi squared 28.56 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 2.1 +- 0.0 x 10^-5 erg/cm2 and the 1-sec peak flux measured from T+11.65 sec in the 15-150 keV band is 21.8 +- 0.5 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.37 +- 0.02 (chi squared 44.40 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/689597/BA/
GCN Circular #19507
D. Malesani (DARK/NBI), D. Xu (NAOC/CAS), H. Jonsson (Lund Univ.), and P. Jakobsson (Univ. Iceland) report on behalf of a larger collaboration:
We observed the field of GRB 160607A (Ukwatta et al., GCN 19502) with the Nordic Optical Telescope (NOT), located in La Palma (Canary Islands). Observations were carried out at large airmass (~3) in the SDSS i filter, for a total of 20 min on source, at a mean epoch 2016 June 8.19 UT (0.725 days after the BAT trigger).
Within the refined XRT position (Goad et al., GCN 19503), we detect a single, faint source at coordinates (J2000):
```
RA = 00:54:40.14
Dec = -04:56:53.3
```
Carrying out photometry against the SDSS catalog, we derive a magnitude i = 23.45 +- 0.20 AB. As this value is fainter than the SDSS limit, and as we lack variability information, we cannot presently conclude whether this source is the afterglow of GRB 160607A. Further observations are planned, but will be probably delayed until the field has a better visibility from La Palma.
GCN Circular #19511
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report:
The long-duration 160607A (Swift-BAT trigger #689597: Ukwatta et al., GCN 19502; Lien et al., GCN 19506) triggered Konus-Wind at T0=40436.923 s UT (11:13:56.923).
The burst light curve shows a complex structure of multiple peaks with a total duration of ~38 s. The emission is seen up to ~15 MeV.
As observed by Konus-Wind, the burst had a fluence of 4.12(-0.51,+0.64)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+11.952 s, of 8.13(-1.59,+1.64)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+38.912 s) is best fit in the 70 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.68(-0.43,+1.47), the high energy photon index beta = -2.51(-0.35,+0.26), the peak energy Ep = 176(-42,+25) keV, chi2 = 84/76 dof.
The spectrum near the peak count rate (measured from T0+8.448 to T0+14.336 s) is best fit in the 70 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.68(-0.31,+0.39), the high energy photon index beta = -2.76(-0.37,+0.23), the peak energy Ep = 188(-17,+17) keV, chi2 = 56/74 dof.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB160607_T40436/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #19512
T.-W. Chen, F. Knust, J. Greiner (all MPE Garching), and D. A. Kann (TLS) report on behalf of the GROND team:
We observed the field of GRB 160607A (Swift trigger 689597; Ukwatta et al., GCN #19502) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
At the enhanced XRT position (Goad et al., GCN #19503), an afterglow candidate was discovered by NOT (Malesani et al., GCN #19507) at i' = 23.45 +/- 0.20 (AB mag), 0.725 days after the BAT trigger.
GROND observations started at 08:48 UT on 2016 June 8, 0.899 days after the GRB trigger, and are continuing. They were performed at an average seeing of 1.5" and at an average airmass of 1.48.
We found a single point source at the edge of the 1.5" Swift-XRT error circle at
RA (J2000.0) = 00 h 54 m 40.164 s
DEC (J2000.0) = -04d 56' 53.23"
with an uncertainty of 0.13" in each coordinate.
The position is consistent with the NOT position, we find that the source has faded significantly.
Based on the 100.83 min of total exposures in g'r'i'z' and 38.00 min in JHK, we estimate preliminary magnitudes for detections and the detection limits (all in AB system) of:
```
g' > 25.4 mag,
r' = 24.49 +/- 0.19 mag,
i' = 24.51 +/- 0.46 mag,
z' > 24.0 mag,
J = 22.34 +/- 0.34 mag,
H = 21.29 +/- 0.21 mag, and
K > 21.3 mag.
```
Given magnitudes are calibrated against SDSS field stars as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.05 mag in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN Circular #19513
S. J. LaPorte (PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160607A 84 s after the BAT trigger (Ukwatta et al., GCN Circ. 19502). No optical afterglow consistent with the enhanced XRT position (Goad et al., GCN Circ. 19503) nor at the position of the NOT source (Malesani et al., GCN 19507), is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            84          233          147         >20.4
u_FC               296          546          246         >19.9
white               84         1658          299         >20.6
v                  626         1707          117         >18.7
b                  552         1633          115         >19.5
u                  296         1088          393         >19.9
w1                 849         1237           39         >19.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #19517
M. Moriyama, A. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence) P. S. Marrocchesi (U of Siena) and the CALET collaboration:
The long-duration GRB 160607A (Swift, Ukwatta et al. GCN Circ. 19502; Konus-Wind trigger time on 11:13:56.92 UT; INTEGRAL-ACS trigger #7487) triggered the CALET Gamma-Ray Burst Monitor (CGBM) at 11:13:57.49 on 7 June 2016. The burst signal was seen by all CGBM instruments.
The light curve of the SGM shows a complex structure with multiple spikes. The emission starts at T0 and ends at T0+30 sec. The multiple spikes peak at T0+2 sec, T0+4 sec, T0+7 sec, T0+11 sec, T0+14 sec, T0+15 sec and T0+21 sec. The T90 duration measured by the SGM data is 18.9 +- 2.9 sec (40-1000 keV). The light curve is available at
http://cgbm.calet.jp/cgbm_trigger/flight/1149333220/
The CGBM data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.

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Jochen Greiner, last update: 10-Jun-2016 [Disclaimer]