Gamma-ray Burst 160601A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:43:16 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     688452,   Seg_Num: 0
GRB_RA:          235.034d {+15h 40m 08s} (J2000),
                 235.087d {+15h 40m 21s} (current),
                 234.873d {+15h 39m 29s} (1950)
GRB_DEC:         +64.495d {+64d 29' 41"} (J2000),
                 +64.442d {+64d 26' 32"} (current),
                 +64.654d {+64d 39' 16"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       498 [cnts]    Image_Peak=57 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10427     E_range: 50-350 keV
BKG_INTEN:       15098 [cnts]
BKG_TIME:        52967.64 SOD {14:42:47.64} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17540 TJD;   153 DOY;   16/06/01
GRB_TIME:        52982.36 SOD {14:43:02.36} UT
GRB_PHI:         144.48 [deg]
GRB_THETA:        25.87 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     32.29 [sigma]
IMAGE_SIGNIF:    7.25 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +3  -3  +0  +0  +4  +0 
SUN_POSTN:        70.00d {+04h 39m 59s}  +22.16d {+22d 09' 48"}
SUN_DIST:         92.62 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.07d {+01h 28m 18s}   +6.05d {+06d 03' 00"}
MOON_DIST:       105.35 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.20, 44.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      171.87, 75.57 [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 = 200.99,12.98 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:44:28 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.023d {+15h 40m 05s} (J2000)
POINT_DEC:       +64.507d {+64d 30' 27"} (J2000)
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53056.37 SOD {14:44:16.37} UT,   74.0 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:46:41 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     688452,   Seg_Num: 0
GRB_RA:          235.034d {+15h 40m 08s} (J2000),
                 235.087d {+15h 40m 21s} (current),
                 234.873d {+15h 39m 29s} (1950)
GRB_DEC:         +64.495d {+64d 29' 41"} (J2000),
                 +64.442d {+64d 26' 32"} (current),
                 +64.654d {+64d 39' 16"} (1950)
GRB_DATE:        17540 TJD;   153 DOY;   16/06/01
GRB_TIME:        52982.42 SOD {14:43:02.42} UT
TRIGGER_INDEX:   10427
GRB_PHI:         144.48 [deg]
GRB_THETA:        25.87 [deg]
DELTA_TIME:      -36.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     32.29 [sigma]
IMAGE_SIGNIF:    7.25 [sigma]
LC_URL:          sw00688452000msb.lc
SUN_POSTN:        70.00d {+04h 40m 00s}  +22.16d {+22d 09' 49"}
SUN_DIST:         92.62 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.11d {+01h 28m 26s}   +6.06d {+06d 03' 38"}
MOON_DIST:       105.34 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.20, 44.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      171.87, 75.57 [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 = 200.99,12.98 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:47:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.023d {+15h 40m 05s} (J2000)
POINT_DEC:       +64.508d {+64d 30' 28"} (J2000)
POINT_ROLL:      346.144d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53059.98 SOD {14:44:19.98} UT,   77.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.397
N_STARS:         26
X_OFFSET:        378 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1567 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00688452000msufc0077.fits
SUN_POSTN:        70.00d {+04h 40m 00s}  +22.16d {+22d 09' 49"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.11d {+01h 28m 27s}   +6.06d {+06d 03' 45"}
MOON_DIST:       105.34 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.22, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:47:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.023d {+15h 40m 05s} (J2000)
POINT_DEC:       +64.508d {+64d 30' 28"} (J2000)
POINT_ROLL:      346.144d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53059.98 SOD {14:44:19.98} UT,   77.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.397
N_STARS:         26
X_OFFSET:        378 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1567 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00688452000msufc0077.fits
SUN_POSTN:        70.00d {+04h 40m 00s}  +22.16d {+22d 09' 49"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.12d {+01h 28m 28s}   +6.06d {+06d 03' 49"}
MOON_DIST:       105.34 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.22, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [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 01 Jun 16 14:48:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.023d {+15h 40m 05s} (J2000)
POINT_DEC:       +64.508d {+64d 30' 28"} (J2000)
ROLL:            346.144d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53059.98 SOD {14:44:19.98} UT,   77.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     486485076
X_OFFSET:        697 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw00688452000msuni0094.fits
SUN_POSTN:        70.00d {+04h 40m 00s}  +22.16d {+22d 09' 49"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.13d {+01h 28m 30s}   +6.07d {+06d 03' 59"}
MOON_DIST:       105.34 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.22, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [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 01 Jun 16 14:48:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.023d {+15h 40m 05s} (J2000)
POINT_DEC:       +64.508d {+64d 30' 28"} (J2000)
ROLL:            346.144d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53059.98 SOD {14:44:19.98} UT,   77.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     486485076
X_OFFSET:        697 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw00688452000msuni0094.fits
SUN_POSTN:        70.00d {+04h 40m 00s}  +22.16d {+22d 09' 49"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.13d {+01h 28m 31s}   +6.07d {+06d 04' 03"}
MOON_DIST:       105.34 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.22, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [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:     Wed 01 Jun 16 14:52:11 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     688452,   Seg_Num: 0
GRB_RA:          234.9371d {+15h 39m 44.90s} (J2000),
                 234.9905d {+15h 39m 57.70s} (current),
                 234.7765d {+15h 39m 06.34s} (1950)
GRB_DEC:         +64.5399d {+64d 32' 23.6"} (J2000),
                 +64.4874d {+64d 29' 14.7"} (current),
                 +64.7002d {+64d 42' 00.5"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53067.00 SOD {14:44:27.00} UT,   84.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        70.00d {+04h 40m 01s}  +22.16d {+22d 09' 50"}
SUN_DIST:         92.57 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.16d {+01h 28m 39s}   +6.08d {+06d 04' 40"}
MOON_DIST:       105.33 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.29, 44.08 [deg] galactic lon,lat of the burst
ECL_COORDS:      171.63, 75.55 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:53:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.025d {+15h 40m 06s} (J2000)
POINT_DEC:       +64.510d {+64d 30' 35"} (J2000)
POINT_ROLL:      346.146d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53271.90 SOD {14:47:51.90} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.014
N_STARS:         122
X_OFFSET:        138 [pixels]
Y_OFFSET:        368 [pixels]
X_MAX:           1577 [pixels]
Y_MAX:           1807 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00688452000msufc0289.fits
SUN_POSTN:        70.00d {+04h 40m 01s}  +22.16d {+22d 09' 51"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.18d {+01h 28m 43s}   +6.08d {+06d 04' 58"}
MOON_DIST:       105.33 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.23, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:54:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.025d {+15h 40m 06s} (J2000)
POINT_DEC:       +64.510d {+64d 30' 35"} (J2000)
POINT_ROLL:      346.146d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53271.90 SOD {14:47:51.90} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.014
N_STARS:         122
X_OFFSET:        138 [pixels]
Y_OFFSET:        368 [pixels]
X_MAX:           1577 [pixels]
Y_MAX:           1807 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00688452000msufc0289.fits
SUN_POSTN:        70.00d {+04h 40m 01s}  +22.16d {+22d 09' 51"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.18d {+01h 28m 43s}   +6.08d {+06d 05' 01"}
MOON_DIST:       105.33 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.23, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [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 01 Jun 16 14:54:14 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     688452,   Seg_Num: 0
GRB_RA:          234.9355d {+15h 39m 44.51s} (J2000),
                 234.9889d {+15h 39m 57.32s} (current),
                 234.7749d {+15h 39m 05.96s} (1950)
GRB_DEC:         +64.5405d {+64d 32' 25.7"} (J2000),
                 +64.4880d {+64d 29' 16.9"} (current),
                 +64.7008d {+64d 42' 02.7"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53067.00 SOD {14:44:27.00} UT,   84.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        70.01d {+04h 40m 01s}  +22.16d {+22d 09' 51"}
SUN_DIST:         92.57 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.18d {+01h 28m 44s}   +6.08d {+06d 05' 03"}
MOON_DIST:       105.33 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.29, 44.08 [deg] galactic lon,lat of the burst
ECL_COORDS:      171.63, 75.55 [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 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 01 Jun 16 14:55:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.025d {+15h 40m 06s} (J2000)
POINT_DEC:       +64.510d {+64d 30' 35"} (J2000)
ROLL:            346.146d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53271.90 SOD {14:47:51.90} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     486485288
X_OFFSET:        697 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw00688452000msuni0306.fits
SUN_POSTN:        70.01d {+04h 40m 01s}  +22.16d {+22d 09' 51"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.19d {+01h 28m 45s}   +6.09d {+06d 05' 11"}
MOON_DIST:       105.33 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.23, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [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 01 Jun 16 14:55:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     688452,   Seg_Num: 0
POINT_RA:        235.025d {+15h 40m 06s} (J2000)
POINT_DEC:       +64.510d {+64d 30' 35"} (J2000)
ROLL:            346.146d
IMG_START_DATE:  17540 TJD;   153 DOY;   16/06/01
IMG_START_TIME:  53271.90 SOD {14:47:51.90} UT,   289.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     486485288
X_OFFSET:        697 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw00688452000msuni0306.fits
SUN_POSTN:        70.01d {+04h 40m 01s}  +22.16d {+22d 09' 51"}
SUN_DIST:         92.61 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       22.19d {+01h 28m 46s}   +6.09d {+06d 05' 15"}
MOON_DIST:       105.33 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.23, 44.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      171.81, 75.57 [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 #19478
D. Kocevski (NASA/GSFC/ORAU), P.A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), B. Mingo (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), T. G. R. Roegiers (PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 14:43:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160601A (trigger=688452). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 235.034, +64.495 which is
```
   RA(J2000) = 15h 40m 08s
   Dec(J2000) = +64d 29' 41"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.2 sec. The peak count rate was ~7000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 14:44:16.3 UT, 74.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 234.9351, 64.5401 which is equivalent to:
```
   RA(J2000)  = 15h 39m 44.43s
   Dec(J2000) = +64d 32' 24.2"
```
with an uncertainty of 3.3 arcseconds (radius, 90% containment). This location is 223 arcseconds from the BAT onboard position. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time. This position is more than 2-sigma away from the BAT position, and so possibly unrelated to the trigger.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.04 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 78 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag.
Burst Advocate for this burst is D. Kocevski (dankocevski 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 Circular #19479
A.Gabovich, V.Yurkov, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk
V. Lipunov, E.Gorbovskoy, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Kornilov, D.Kuvshinov, V.V.Chazov, E.Popova, Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
K.Ivanov, N.M.Budnev, O.Gres, V.A.Poleshchuk Irkutsk State University
A. Tlatov, V.Senik, D. Dormidontov, A.V. Parhomenko Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Ricardo Podesta, Claudio Mallamaci, Federico Podest, Carlos Lopez Observatorio Astronomico Felix Aguilar (OAFA)
MASTER-Amur robotic telescope (MASTER-Net: http://observ.pereplet.ru) was pointed to the GRB160601A (Kocevski et al., GCN19478) 67 sec after notice time and 81 sec after trigger time at 2016-06-01 14:44:23 UT. On our first (20s and 70s exposures) set we haven`t found optical transient within SWIFT error-box (ra=15h 39m 44.43s dec=+64d 32' 24.2" r=3.3 arcsec) The 5-sigma upper limit is 17.5mag.
MASTER-Tunka robotic telescope was pointed to the GRB160601.61 55 sec after notice time and 73 sec after trigger time at 2016-06-01 14:44:16 UT, on the first images (20s) there is also no OT .
The message may be cited.
GCN Circular #19480
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 160601A (Kocevski et al., GCNC 19478) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2016-06-01 14:43:48 UT (~46 sec after the burst). We did not find any new point source within the XRT circle (Kocevski et al., GCNC 19478) in all the three bands.
Three sigma upper limits of the OT are listed below. We used SDSS-DR8 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'    Rc     Ic
-----------------------------------------------------
0.01716    15:07:45    2460.0   >20.5  >20.3  >19.3
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #19482
K. Yanagisawa, D. Kuroda, Y. Shimizu, H. Izumiura(OAO/NAOJ), M. Yoshida (Hiroshima), K. Ohta(Kyoto) and N. Kawai(Tokyo Tech.) report on behalf of the MITSuME collaboration:
We observed the field of GRB 160601A (Kocevski et al., GCN 19478) in Ks-band with a wide-field near infrared imager at Okayama Astrophysical Observatory (Japan). The imager has effective aperture of 0.91 m.
Observations started from 14:57 UT on 1st June, 14 min after the BAT trigger, to 15:22 UT. The total exposure of 10.0 min was successfully obtained.
In our co-add image, we did not find any new point source within the XRT error circle down to the limiting magnitude of Ks=16.1 (Vega, S/N=3). The photometric calibration was made against 2MASS field stars.
```
T0+[sec]    MID-UT     T-EXP[sec]      Ks
---------------------------------------------------
   +1,560    15:09      600.0          >16.1
---------------------------------------------------
T0+ : Elapsed time after the burt [sec]
T-EXP: Total Exposure time [sec]
```
GCN Circular #19483
E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 160601A (Kocevski et al., GCN 19478) with AZT-33IK telescope of Sayan observatory (Mondy) starting on June, 01 (UT) 15:00:41. We obtained several images in R-filter under good weather conditions and FWHM of 1.5 arcsec. Using only part of images available we marginally detect (S/N ~2) a source at the edge of Swift-XRT position (Kocevski et al., GCN 19478). Coordinates of the source are (J2000) 15:39:44.43 +64:32:19.3 with uncertainty of 1 arcsec. Preliminary photometry of the source is R~22.3, and details of observations are following
```
Date        UT start   t-T0    Filter  Exp.   OT(?)  UpperLimit (3 sigma)
                       (mid, days)      (s)

2016-06-01  15:00:41   0.03026  R      16*60  22.3   21.8
```
Photometry is based on nearby SDSS-DR9 stars, Lupton transformations into R:
```
SDSS-DR9_id            R(Lupton)
J153959.67+643325.7    16.72
J153956.37+643102.2    17.00
J153931.88+643247.0    17.02
J153927.50+643304.3    19.23
J153942.70+643016.4    16.27
```
We will update the results after all the data will be available.
GCN Circular #19484
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 609 s of XRT Photon Counting mode data and 1 UVOT images for GRB 160601A, 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 = 234.93505, +64.54133 which is equivalent to:
```
RA (J2000): 15h 39m 44.41s
Dec (J2000): +64d 32' 28.8"
```
with an uncertainty of 3.3 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 #19485
D. Malesani (DARK/NBI), S. Schulze (PUC, MAS), N. R. Tanvir (U Leicester), D. Xu (NAOC/CAS), A. A. Djupvik (NOT) and P. Jakobsson (U Iceland) report on behalf a larger collaboration:
We observed the field of the short GRB 160601A (Kocevski et al., GCN 19478) with the Nordic Optical Telescope (NOT) equipped with the AlFOSC imager. Our first 900-s exposure in the r band started on Jun 1.885 UT (6.5 hr after the GRB).
Close to the UVOT-enhanced XRT position (Evans et al., GCN 19484), we detect two sources, at coordinates:
(1)
```
RA = 15:39:43.97
Dec = +64:32:30.5
r mag = 22.85 +/- 0.10 (AB)
```
(2)
```
RA = 15:39:44.91
Dec = +64:32:32.1
r mag = 23.04 +/- 0.09 (AB)
```
Visual inspection of the SDSS at the above locations shows a faint, marginally detected object coincident with source (2), but no object at the position of source (1). We thus consider source (1) to be a potential afterglow candidate, though further observations are needed to test its variability.
GCN Circular #19486
A. Maselli (INAF-IASFPA), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB) and D. Kocevski report on behalf of the Swift-XRT team:
We have analysed 7.9 ks of XRT data for GRB 160601A (Kocevski et al. GCN Circ. 19478), from 94 s to 23.6 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 19484).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.49 (+0.14, -0.15).
If the light curve continues to decay with a power-law decay index of 0.49, the count rate at T+24 hours will be 2.0 x 10^-3 count s^-1
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00688452.
This circular is an official product of the Swift-XRT team.
GCN Circular #19488
S. Schulze (PUC, MAS), D. Malesani (DARK/NBI), A. A. Djupvik (NOT) and P. Jakobsson (U Iceland) report on behalf a larger collaboration:
We re-observed the field of the short GRB 160601A (Kocevski et al., GCN 19478) with the Nordic Optical Telescope (NOT) equipped with the AlFOSC imager. Our first 600-s exposure in the r band started on June 1 at 21:14:48 UT (13.5 hr after the GRB).
We cleanly detect the two objects reported in Malesani et al. (GCN 19485).
Object (1) (RA, Dec. = 15:39:43.97, +64:32:30.5) faded from 22.85 +- 0.10 to 23.36 +- 0.10 mag. The fading corresponds to a decay slope of 0.64 +- 0.25.
Object (2) (RA, Dec. = 15:39:44.91, +64:32:32.1) exhibits no variability beyond the 1.7 sigma confidence level.
These properties let us conclude that object (1) is the afterglow of the short GRB.
GCN Circular #19489
T. Nakaoka, Hirochi, J., Yoshida, M. and Kawabata, K. S. (Hiroshima Univ.) report on behalf of the OISTER collaboration
We performed I and Ks bands imaging observations around the error circle of GRB 160601A (Kocevski et al., GCNC 19478) with the optical infrared simultaneous camera HONIR attached to Kanata telescope of Hiroshima University. We started the observations at 2016-06-01 16:42 UT. We did not find any optical-infrared counterpart of the burst. Five sigma upper limits (Vega magnitude) are listed below.
```
# T0+[day]  MID-UT    T-EXP(I)   T-EXP(Ks)     I      Ks
-----------------------------------------------------------
0.08249     17:25:14    4025s      3500s     >20.6   >17.0
-----------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #19490
E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 160601A (Kocevski et al., GCN 19478) with AZT-33IK telescope of Sayan observatory (Mondy) starting on June, 01 (UT) 15:00:41, i.e. 17 minutes after GRB trigger (GCN 19483). In a combined image we detected both NOT sources (Malesani et al., GCN 19485) near enhanced XRT error circle (Evans et al., GCN 19484). Preliminary photometry (Vega) of the sources are following
```
Date        UT start   t-T0    Filter Exp.  NOT1          NOT2
                       (mid, days)     (s)

2016-06-01  15:00:41   0.04181  R    85*60  22.40+/-0.25  22.10+/-0.20
```
Photometry is based on nearby SDSS-DR9 stars, Lupton transformations into R:
```
SDSS-DR9_id            R(Lupton)
J153959.67+643325.7    16.72
J153956.37+643102.2    17.00
J153931.88+643247.0    17.02
J153927.50+643304.3    19.23
J153942.70+643016.4    16.27
```
A finding chart can be found at http://grb.rssi.ru/GRB160601A/GRB160601A_Mondy_160601_NOT_1_2.png
GCN Circular #19491
J. C. Tello, Y. Hu (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC, ISA-UMA), S. Oates (Warwick U.) on behalf of a larger collaboration, report:
We observed the field of GRB 160601A (Kocevski et al., GCN 19478) with the Gran Telescopio Canarias (GTC) with the OSIRIS instrument and acquired 6x100s images starting 01:37:31 UT and ending 01:49:29 UT on July 2nd (10h54m-11h06m after the Swift trigger) and we detect the afterglow candidates reported by Malesani et al. (GCN 19485).
We also find like Schulze (GCN 19488) that Object 1 is fading and at the time of our observations was at a magntude of ~ 23.5 in the Sloan_r filter and calibrated to SDSS Release 6.
We note that our observations precede Schulze's by 2.5 hours and are slightly fainter but not much more than the uncertainty of these preliminary results, implying either a rebrightening event or a plateau due to either afterglow behaviour or host galaxy.
GCN Circular #19492
S. B. Cenko (NASA/GSFC), W.-F. Fong (Arizona), A. J. Levan (Warwick), A. Cucchiara (STScI), E. Berger (Harvard), and D. A Perley (DARK) report on behalf of a larger collaboration:
We imaged the location of GRB160601A (Kocevski et al., GCN 19478) with the Gemini Multi-Object Spectrograph (GMOS) mounted on the 8m Gemini North telescope. We obtained a series of 5 x 180 s r-band images beginning at 6:02 UT on 2016 June 2 (~ 15.3 hr after the BAT trigger). The candidate optical afterglow proposed by Malesani et al (GCN 19485; their Source 1) is confirmed to be fading (see also Schulze et al., GCN 19488, Tello et al., GCN 19491). Using nearby point sources from SDSS for calibration, we measure a magnitude of r = 23.69 +/- 0.05 at this time.
We note that the source appears to be (marginally) extended in our GMOS images, and therefore host contamination may to be present in the above magnitude estimate.
GCN Circular #19494
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), D. Kocevski (NASA/GSFC/ORAU), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), 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-240 to T+500 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160601A (trigger #688452) (Kocevski, et al., GCN Circ. 19478). The BAT ground-calculated position is RA, Dec = 234.923, 64.532 deg which is
```
   RA(J2000)  =  15h 39m 41.6s
   Dec(J2000) = +64d 31' 53.5"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 66%.
The mask-weighted light curve shows a single pluse starting ~T-0.1 sec, and ending around ~T+0.15 sec. T90 (15-350 keV) is 0.12 +- 0.02 sec (estimated error including systematics).
The time-averaged spectrum from T-0.02 to T+0.12 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.04 +- 0.24. The fluence in the 15-150 keV band is 6.6 +- 1.1 x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.45 sec in the 15-150 keV band is 0.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/688452/BA/
GCN Circular #19495
Y. Saito, Y. Tachibana, T. Yoshii, T. Fujiwara, Y. Ono, Y. Muraki, S. Harita, T, Ozawa, K. Saisho, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 160601A (D. Kocevski et al., GCN Circular #19478) with theoptical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2016-06-01 23:43:35 UT (33 sec after the burst). We did not find any new point source within XRT circle in all three bands.
We obtained following limits for the magnitudes.
```
T0+[day]     MID-UT      T-EXP[sec]          g'           Rc            Ic 
------------------------------------------------------------------------------------------
0.078          16:35:35        12060        >21.7         >21.1         >19.9    
------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst.
T-EXP: Total Exposure time.
```
We used GSC2.3 catalog for flux calibration.
GCN Circular #19496
S. Sebzda (Penn State/Swift) and D. Kocevski (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160601A 78 s after the BAT trigger (Kocevski et al., GCN Circ. 19478). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 19484) 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)       78             227          147      >21.00
white            78      	589          166      >20.90
v               619             639           19      >17.30
b               544             564           19      >18.32
u (fc)          289             539    	     491      >20.19
uvw1            668             688           19      >17.72
uvm2            643             663           19      >17.46
uvw2            595             615           19      >17.87
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #19497
S. B. Cenko and E. Troja (NASA/GSFC) report on behalf of a larger collaboration:
We imaged the location of the optical afterglow (Malesani et al., GCN 19485) of the short GRB 160601A (Kocevski et al., GCN 19478) with the Large Monolithic Imager on the 4.3-m Discovery Channel Telescope in Happy Jack, AZ. We obtained a series of 180 s exposures in the r-band filter beginning at 5:00 UT on 2016 June 3 (~ 1.6 d after the Swift trigger). We do not detect any significant emission at the location of the optical afterglow to a limiting magnitude of r > 25.0 (calculated with respect to nearby point sources from SDSS). Compared to the most recent detection with Gemini (Cenko et al, GCN 19492), our limits imply a significant steepening of the afterglow decay, with a lower limit on the power-law index of alpha > 1.3 (compared to alpha ~ 0.6 at earlier times; Schulze et al. 19488).
We thank the observers (T. Farnham, M. Knight, and L. Feagan) and the DCT staff for their assistance with these observations.
GCN Circular #19498
E. Mazaeva (IKI), A. Volnova (IKI), R. Inasaridze (AbAO), V. Ayvazian (AbAO), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of of the Swift GRB 160601A (Kocevski et al., GCN 19478) with AS-32 (0.7m) telescope of Abastumani Observatory starting on June, 01 (UT) 19:07:28. We obtained several unfiltered images of the field. In a combined image we detected both NOT sources (Malesani et al., GCN 19485). Preliminary photometry of the optical afterglow (NOT source #1, Schulze et al., GCN 19488) are following
```
Date        UT start   t-T0    Filter Exp.    OT         UpLim (3 sigma)
                        (mid, days)     (s)

2016-06-01  19:07:28   0.20169 CR     26*120  22.9+/-0.3 23.0
```
Photometry is based on nearby SDSS-DR9 stars, Lupton transformations into R:
```
SDSS-DR9_id            R(Lupton)
J153959.67+643325.7    16.72
J153956.37+643102.2    17.00
J153931.88+643247.0    17.02
J153927.50+643304.3    19.23
J153942.70+643016.4    16.27
J153948.64+643150.1    19.27
J153948.72+643220.0    19.86
```
GCN Circular #19608
K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), C. Rumsey, D. Titterington, S. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB 160601A (Kocevski et al., GCN 19478) as part of the 4pisky program, and subsequent follow up observations were obtained up to 10 days post-burst. Our observations at 15 GHz on 2016 Jun 01.78, Jun 02.95, Jun 04.95, and Jun 11.95 (UT) do not reveal any radio source at the XRT location (Evans et al., GCN 19484), with 3sigma upper limits of 282 uJy, 216 uJy, 108 uJy, and 132 uJy respectively.
We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.

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Jochen Greiner, last update: 28-Jun-2016 [Disclaimer]