Gamma-ray Burst 190604B

(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 04 Jun 19 14:57:37 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     906654,   Seg_Num: 0
GRB_RA:          297.587d {+19h 50m 21s} (J2000),
                 297.897d {+19h 51m 35s} (current),
                 296.785d {+19h 47m 08s} (1950)
GRB_DEC:         -32.932d {-32d 55' 56"} (J2000),
                 -32.882d {-32d 52' 55"} (current),
                 -33.060d {-33d 03' 34"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2580 [cnts]    Image_Peak=168 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       14722 [cnts]
BKG_TIME:        53816.98 SOD {14:56:56.98} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18638 TJD;   155 DOY;   19/06/04
GRB_TIME:        53835.79 SOD {14:57:15.79} UT
GRB_PHI:         176.14 [deg]
GRB_THETA:        33.47 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.00 [sigma]
IMAGE_SIGNIF:    9.22 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0  +0  +0 +75  +0 
SUN_POSTN:        72.34d {+04h 49m 22s}  +22.44d {+22d 26' 38"}
SUN_DIST:        138.66 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.24d {+05h 56m 57s}  +21.70d {+21d 41' 42"}
MOON_DIST:       152.30 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.47,-25.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      293.39,-11.71 [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 = 174.48,14.68 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 04 Jun 19 14:58:01 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger 
TRIGGER_NUM:    8293,   Sub_Num: 0
GRB_INTEN:      9.12 [sigma]
GRB_TIME:       53829.46 SOD {14:57:09.46} UT
GRB_DATE:       18638 TJD;   155 DOY;   19/06/04
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:       
COMMENTS:       NOTE: This SPIACS event is temporally(6.0<100sec) coincident with the SWIFT_BAT event (trignum=906654).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2019-06/2019-06-04T14-57-09.2643-06116-11152-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 14:59:48 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     906654,   Seg_Num: 0
GRB_RA:          297.5363d {+19h 50m 08.7s} (J2000),
                 297.8472d {+19h 51m 23.3s} (current),
                 296.7346d {+19h 46m 56.3s} (1950)
GRB_DEC:         -32.9782d {-32d 58' 41.5"} (J2000),
                 -32.9279d {-32d 55' 40.6"} (current),
                 -33.1052d {-33d 06' 18.6"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  53952.57 SOD {14:59:12.57} UT,   116.8 [sec] since BAT Trigger Time
CENTROID_X:      392.71,  raw= 393  [pixels]
CENTROID_Y:      264.94,  raw= 265  [pixels]
ROLL:            92.91 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -78.86
GRB_POS_XRT_Z:   203.47
IMAGE_URL:       sw00906654000msxps_rw.img
SUN_POSTN:        72.35d {+04h 49m 23s}  +22.44d {+22d 26' 38"}
SUN_DIST:        138.70 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.26d {+05h 57m 02s}  +21.70d {+21d 41' 49"}
MOON_DIST:       152.35 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.41,-25.94 [deg] galactic lon,lat of the burst
ECL_COORDS:      293.34,-11.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 14:59:51 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     906654,   Seg_Num: 0
GRB_RA:          297.5363d {+19h 50m 08.7s} (J2000),
                 297.8472d {+19h 51m 23.3s} (current),
                 296.7346d {+19h 46m 56.3s} (1950)
GRB_DEC:         -32.9782d {-32d 58' 41.5"} (J2000),
                 -32.9279d {-32d 55' 40.6"} (current),
                 -33.1052d {-33d 06' 18.6"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  53952.57 SOD {14:59:12.57} UT,   116.8 [sec] since BAT Trigger Time
CENTROID_X:      392.71,  raw= 393  [pixels]
CENTROID_Y:      264.94,  raw= 265  [pixels]
ROLL:            92.91 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -78.86
GRB_POS_XRT_Z:   203.47
IMAGE_URL:       sw00906654000msxps_rw.img
SUN_POSTN:        72.35d {+04h 49m 23s}  +22.44d {+22d 26' 38"}
SUN_DIST:        138.70 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.26d {+05h 57m 03s}  +21.70d {+21d 41' 49"}
MOON_DIST:       152.35 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.41,-25.94 [deg] galactic lon,lat of the burst
ECL_COORDS:      293.34,-11.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 14:59:34 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     906654,   Seg_Num: 0
GRB_RA:          297.5363d {+19h 50m 08.71s} (J2000),
                 297.8472d {+19h 51m 23.33s} (current),
                 296.7346d {+19h 46m 56.31s} (1950)
GRB_DEC:         -32.9782d {-32d 58' 41.5"} (J2000),
                 -32.9279d {-32d 55' 40.6"} (current),
                 -33.1052d {-33d 06' 18.6"} (1950)
GRB_ERROR:       6.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.11e-08 [erg/cm2/sec]
GRB_SIGNIF:      4.69 [sigma]
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  53952.57 SOD {14:59:12.57} UT,   116.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.25 261.65 243.63
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        72.34d {+04h 49m 23s}  +22.44d {+22d 26' 38"}
SUN_DIST:        138.70 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.26d {+05h 57m 02s}  +21.70d {+21d 41' 48"}
MOON_DIST:       152.34 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.41,-25.94 [deg] galactic lon,lat of the burst
ECL_COORDS:      293.34,-11.74 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 3.73 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:01:40 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     906654,   Seg_Num: 0
GRB_RA:          297.587d {+19h 50m 21s} (J2000),
                 297.897d {+19h 51m 35s} (current),
                 296.785d {+19h 47m 08s} (1950)
GRB_DEC:         -32.932d {-32d 55' 56"} (J2000),
                 -32.882d {-32d 52' 55"} (current),
                 -33.060d {-33d 03' 34"} (1950)
GRB_DATE:        18638 TJD;   155 DOY;   19/06/04
GRB_TIME:        53835.79 SOD {14:57:15.79} UT
TRIGGER_INDEX:   146
GRB_PHI:         176.14 [deg]
GRB_THETA:        33.47 [deg]
DELTA_TIME:      39.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.00 [sigma]
IMAGE_SIGNIF:    9.22 [sigma]
LC_URL:          sw00906654000msb.lc
SUN_POSTN:        72.35d {+04h 49m 23s}  +22.44d {+22d 26' 39"}
SUN_DIST:        138.66 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.28d {+05h 57m 07s}  +21.70d {+21d 41' 55"}
MOON_DIST:       152.34 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.47,-25.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      293.39,-11.71 [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 = 174.48,14.68 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:02:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.607d {+19h 50m 26s} (J2000)
POINT_DEC:       -32.958d {-32d 57' 29"} (J2000)
POINT_ROLL:      92.903d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  53962.06 SOD {14:59:22.06} UT,   126.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.759
N_STARS:         110
X_OFFSET:        280 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1239 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00906654000msufc0126.fits
SUN_POSTN:        72.35d {+04h 49m 23s}  +22.44d {+22d 26' 39"}
SUN_DIST:        138.64 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.29d {+05h 57m 09s}  +21.70d {+21d 41' 57"}
MOON_DIST:       152.32 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.45,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:02:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.607d {+19h 50m 26s} (J2000)
POINT_DEC:       -32.958d {-32d 57' 29"} (J2000)
POINT_ROLL:      92.903d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  53962.06 SOD {14:59:22.06} UT,   126.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.759
N_STARS:         110
X_OFFSET:        280 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1239 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00906654000msufc0126.fits
SUN_POSTN:        72.35d {+04h 49m 23s}  +22.44d {+22d 26' 39"}
SUN_DIST:        138.64 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.29d {+05h 57m 09s}  +21.70d {+21d 41' 58"}
MOON_DIST:       152.32 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.45,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.73 [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 04 Jun 19 15:03:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.607d {+19h 50m 26s} (J2000)
POINT_DEC:       -32.958d {-32d 57' 29"} (J2000)
ROLL:            92.903d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  53962.06 SOD {14:59:22.06} UT,   126.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     581353185
X_OFFSET:        515 [pixels]
Y_OFFSET:        1210 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       675
Y_GRB_POS:       1370
BINNING_INDEX:   1
IM_URL:          sw00906654000msuni0150.fits
SUN_POSTN:        72.35d {+04h 49m 23s}  +22.44d {+22d 26' 39"}
SUN_DIST:        138.64 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.30d {+05h 57m 12s}  +21.70d {+21d 42' 01"}
MOON_DIST:       152.33 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.45,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.73 [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 04 Jun 19 15:03:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.607d {+19h 50m 26s} (J2000)
POINT_DEC:       -32.958d {-32d 57' 29"} (J2000)
ROLL:            92.903d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  53962.06 SOD {14:59:22.06} UT,   126.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     581353185
X_OFFSET:        515 [pixels]
Y_OFFSET:        1210 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       675
Y_GRB_POS:       1370
BINNING_INDEX:   1
IM_URL:          sw00906654000msuni0150.fits
SUN_POSTN:        72.35d {+04h 49m 24s}  +22.44d {+22d 26' 39"}
SUN_DIST:        138.64 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.30d {+05h 57m 12s}  +21.70d {+21d 42' 01"}
MOON_DIST:       152.33 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.45,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.73 [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 04 Jun 19 15:10:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 33"} (J2000)
POINT_ROLL:      92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54174.00 SOD {15:02:54.00} UT,   338.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.803
N_STARS:         68
X_OFFSET:        195 [pixels]
Y_OFFSET:        890 [pixels]
X_MAX:           1154 [pixels]
Y_MAX:           1849 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00906654000msufc0338.fits
SUN_POSTN:        72.35d {+04h 49m 25s}  +22.44d {+22d 26' 41"}
SUN_DIST:        138.65 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.37d {+05h 57m 28s}  +21.71d {+21d 42' 21"}
MOON_DIST:       152.39 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:10:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 33"} (J2000)
POINT_ROLL:      92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54174.00 SOD {15:02:54.00} UT,   338.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.803
N_STARS:         68
X_OFFSET:        195 [pixels]
Y_OFFSET:        890 [pixels]
X_MAX:           1154 [pixels]
Y_MAX:           1849 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00906654000msufc0338.fits
SUN_POSTN:        72.35d {+04h 49m 25s}  +22.44d {+22d 26' 41"}
SUN_DIST:        138.65 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.37d {+05h 57m 29s}  +21.71d {+21d 42' 22"}
MOON_DIST:       152.39 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:11:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 33"} (J2000)
ROLL:            92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54174.00 SOD {15:02:54.00} UT,   338.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     581353397
X_OFFSET:        515 [pixels]
Y_OFFSET:        1210 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       675
Y_GRB_POS:       1370
BINNING_INDEX:   1
IM_URL:          sw00906654000msuni0362.fits
SUN_POSTN:        72.35d {+04h 49m 25s}  +22.44d {+22d 26' 42"}
SUN_DIST:        138.65 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.38d {+05h 57m 32s}  +21.71d {+21d 42' 26"}
MOON_DIST:       152.40 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:11:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 33"} (J2000)
ROLL:            92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54174.00 SOD {15:02:54.00} UT,   338.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     581353397
X_OFFSET:        515 [pixels]
Y_OFFSET:        1210 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       675
Y_GRB_POS:       1370
BINNING_INDEX:   1
IM_URL:          sw00906654000msuni0362.fits
SUN_POSTN:        72.35d {+04h 49m 25s}  +22.44d {+22d 26' 42"}
SUN_DIST:        138.65 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.39d {+05h 57m 32s}  +21.71d {+21d 42' 27"}
MOON_DIST:       152.40 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:17:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 32"} (J2000)
POINT_ROLL:      92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54705.31 SOD {15:11:45.31} UT,   869.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.995
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00906654000msufc0869.fits
SUN_POSTN:        72.36d {+04h 49m 26s}  +22.45d {+22d 26' 43"}
SUN_DIST:        138.65 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.44d {+05h 57m 46s}  +21.71d {+21d 42' 44"}
MOON_DIST:       152.45 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #24753
K. L. Page (U Leicester), S. D. Barthelmy (GSFC), J.D. Gropp (PSU), N. J. Klingler (PSU), S. J. LaPorte (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), D. M. Palmer (LANL), B. Sbarufatti (PSU), M. H. Siegel (PSU), K. K. Simpson (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 14:57:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190604B (trigger=906654). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 297.587, -32.932 which is
```
   RA(J2000) = 19h 50m 21s
   Dec(J2000) = -32d 55' 56"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 250 sec, with two major peaks at ~T0 and ~T+155 s. The peak count rate was ~4000 counts/sec (15-350 keV), at ~155 sec after the trigger.
The XRT began observing the field at 14:59:12.5 UT, 116.8 seconds after the BAT trigger. Using promptly downlinked data we find a bright, variable uncatalogued X-ray source located at RA, Dec 297.53804, -32.97663 which is equivalent to:
```
   RA(J2000)  = 19h 50m 09.13s 
   Dec(J2000) = -32d 58' 35.9"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 218 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.36 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 0.1 s image was 1.11e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 126 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 0.14.
Burst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:17:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 32"} (J2000)
POINT_ROLL:      92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54705.31 SOD {15:11:45.31} UT,   869.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.995
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00906654000msufc0869.fits
SUN_POSTN:        72.36d {+04h 49m 26s}  +22.45d {+22d 26' 43"}
SUN_DIST:        138.65 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.45d {+05h 57m 47s}  +21.71d {+21d 42' 45"}
MOON_DIST:       152.45 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:19:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 32"} (J2000)
ROLL:            92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54705.31 SOD {15:11:45.31} UT,   869.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     581353928
X_OFFSET:        559 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00906654000msuni0893.fits
SUN_POSTN:        72.36d {+04h 49m 26s}  +22.45d {+22d 26' 44"}
SUN_DIST:        138.65 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.46d {+05h 57m 50s}  +21.71d {+21d 42' 49"}
MOON_DIST:       152.47 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 19 15:19:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     906654,   Seg_Num: 0
POINT_RA:        297.605d {+19h 50m 25s} (J2000)
POINT_DEC:       -32.959d {-32d 57' 32"} (J2000)
ROLL:            92.907d
IMG_START_DATE:  18638 TJD;   155 DOY;   19/06/04
IMG_START_TIME:  54705.31 SOD {15:11:45.31} UT,   869.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     581353928
X_OFFSET:        559 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       719
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00906654000msuni0893.fits
SUN_POSTN:        72.36d {+04h 49m 26s}  +22.45d {+22d 26' 44"}
SUN_DIST:        138.66 [deg]   Sun_angle= 9.0 [hr] (West of Sun)
MOON_POSTN:       89.46d {+05h 57m 51s}  +21.71d {+21d 42' 50"}
MOON_DIST:       152.47 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:        7.44,-25.99 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.40,-11.74 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #24743
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 190604B, we find an enhanced XRT position of the afterglow: RA, Dec: 297.5413, -32.9782 which is equivalent to:
```
   RA (J2000)  = 19 50 09.92
   Dec (J2000) = -32 58 41.4
```
with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/906654.
Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #24746
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 206 s of XRT Photon Counting mode data and 1 UVOT images for GRB 190604B, 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 = 297.54058, -32.97803 which is equivalent to:
```
RA (J2000): 19h 50m 9.74s
Dec (J2000): -32d 58' 40.9"
```
with an uncertainty of 1.9 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 #24747
A. A. Breeveld (UCL-MSSL) and K. L. Page (U Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190604B 128 s after the BAT trigger (Page et al., GCN Circ. 24742). A faint source is detected in the initial white UVOT exposure at a position consistent with the enhanced XRT source position (Evans et al., GCN Circ. 24746).
The preliminary detection 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     	128      276         146        19.90 � 0.24
white     	618      812          39        >19.63
v         	669      861          39        >17.95
b         	594      787          39        >18.98
u         	338      588         246        >19.71
uvw1      	718      738          20        >17.44
uvw2      	645      837          39        >18.09
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.15 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #24748
M. Khandagale, H. Kumar, V. Karambelkar, V. Bhalerao(IITB), G. C. Anupama, J. Stanzin (IIA) report on behalf of the GROWTH collaboration:
We observed the field of GRB190604B reported by K. L. Page et al., GCN 24742 at 2019-06-04 and 20:03:18.675 UT with the 0.7m GROWTH-India telescope. We took 2 exposures of 600 seconds each in r filter. No source was found within an uncertainty region of 3.6 arcseconds to RA(J2000) = 19h 50m 09.13s, Dec(J2000) = -32d 58' 35.9" (K. L. Page et al.,GCN 24742).
We obtained the following upper limits:
```
------------------------------------------------------------------

 JD(Start)| Exposure(sec) | Filter | lim_Mag |

------------------------------------------------------------------

2458639.335 | 600 | r | 20.33|

2458639.342 | 600 | r | 19.93|

------------------------------------------------------------------
```
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).
GCN Circular #24749
J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), M.G. Bernadini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , V. D'Elia (ASDC) and K.L. Page report on behalf of the Swift-XRT team:
We have analysed 7.7 ks of XRT data for GRB 190604B (Page et al. GCN Circ. 24742), from 120 s to 34.4 ks after the BAT trigger. The data comprise 285 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 24743).
The late-time light curve (from T0+4.9 ks) can be modelled with a power-law decay with a decay index of alpha=0.94 (+/-0.12).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.40 (+/-0.03). The best-fitting absorption column is 1.49 (+0.16, -0.13) x 10^21 cm^-2, consistent with the Galactic value of 1.4 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.02 (+/-0.12) and a best-fitting absorption column of 3.0 (+/-0.5) 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 (5.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.0 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 1.4 x 10^21 cm^-2
Excess significance: 5.7 sigma
Photon index:	     2.02 (+/-0.12)
```
If the light curve continues to decay with a power-law decay index of 0.94, the count rate at T+24 hours will be 0.057 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.1 x 10^-12 (3.1 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/00906654.
This circular is an official product of the Swift-XRT team.
GCN Circular #24750
Y.-D. Hu, X.-Y.Li, E. Fernandez-Garcia, A. Ayala and A. J. Castro-Tirado (IAA-CSIC), I. Carrasco and C. Perez del Pulgar (Univ. de Malaga), M. D. Caballero-Garcia (ASU-CAS, CZ) and R. Querel (NIWA), on behalf of a larger collaboration,
report:
The 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New Zealand) automatically responded to the Swift GRB 190604B (Page et al. GCNC 24742) only 35 s after the burst). At the position of the Swift/XRT enhanced X-ray position (Evans et al. GCNC 24746), no optical afterglow is detected down to R = 15.5 (for the 1-s image gathered at 14:57:50 UT) or down to 19.8 mag (for the co-added 9x10s unfiltered images at mid-time 15:05:56 UT, i.e. 8.7 min after trigger).
We thank the staff at NIWA for its excellent support.
GCN Circular #24752
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), K. L. Page (U Leicester), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190604B (trigger #906654) (Page et al., GCN Circ. 24742). The BAT ground-calculated position is RA, Dec = 297.546, -32.975 deg which is
```
   RA(J2000)  =  19h 50m 10.9s
   Dec(J2000) = -32d 58' 31.1"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%.
The mask-weighted light curve shows a multi-peaked structure that starts from ~T-40 s and ends at ~T+240 s. There are two major peaks that occur at ~T0 and ~T+158 s, respectively. T90 (15-350 keV) is 220.2 +- 4.7 sec (estimated error including systematics).
The time-averaged spectrum from T-39.776 sec to T+239.504 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.81 +- 0.04. The fluence in the 15-150 keV band is 1.77 +- 0.04 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+157.54 sec in the 15-150 keV band is 7.3 +- 0.4 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/906654/BA/
GCN Circular #24754
S. Belkin (IKI), A. Novichonok (KIAM), A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov (KIAM), Sh. Ehgamberdiev (UBAI) report on behalf of larger IKI GRB FuN collaboration:
We observed the field of the Swift GRB 190604B (Page et al., GCN 24742) with RC-36 0.36-m telescope of Kitab Observatory starting on June 04 (UT) 22:26:32 in Clear filter. We do not find any optical source within enhanced Swift-XRT position (Evans et al., GCN 24746). The non-detection is consistent with BOOTES-3 results (Hu et al., GCN 24750).
Preliminary photometry of the field is following.
```
Date       UT start   t-T0       Filter Exp.   OT  Err.   UL(3sigma)
                       (mid, days)        (s)

2019-06-04 22:26:32   0.32068    CR     21*60  n/d  n/d   18.6
```
The photometry is based on the nearby USNO-B1 (R2) stars.
GCN Circular #24762
L. Izzo, D. A. Kann (both HETH/IAA-CSIC), D. B. Malesani (DTU Space), D. Hartmann (Clemson University), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), and N. R. Tanvir (Univ. Leicester) report on behalf of the Stargate Consortium:
We observed the field of GRB 190604B (Page et al., GCN 24742) with X-shooter mounted on the ESO VLT UT2 (Kueyen). Images were obtained in SDSS g'r'z', as well as a deeper 300 s r' exposure, centered at 05:24:16 UT on June 05, 2019 (0.8483 days after the GRB trigger).
At the position of the UVOT afterglow (Breeveld et al., GCN 24747) and within the XRT error circle (Evans et al., GCN 24746), we detect a faint source only in the latter image.
Using a recent computation of the X-shooter acquisition camera zero-point value, the total number of counts, a seven arcsec radius aperture and the exposure time of 300 s, we derive a magnitude of r'(AB) = 23.27 +/- 0.09 mag.
Because of source faintness, no spectroscopy was attempted.

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Jochen Greiner, last update: 24-Jun-2019 [Disclaimer]