Gamma-ray Burst 180706A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:25:12 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     846395,   Seg_Num: 0
GRB_RA:          181.665d {+12h 06m 40s} (J2000),
                 181.895d {+12h 07m 35s} (current),
                 181.039d {+12h 04m 09s} (1950)
GRB_DEC:         +66.035d {+66d 02' 05"} (J2000),
                 +65.932d {+65d 55' 54"} (current),
                 +66.313d {+66d 18' 47"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6857 [cnts]    Image_Peak=287 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   262     E_range: 25-100 keV
BKG_INTEN:       63458 [cnts]
BKG_TIME:        30242.78 SOD {08:24:02.78} UT
BKG_DUR:         24 [sec]
GRB_DATE:        18305 TJD;   187 DOY;   18/07/06
GRB_TIME:        30280.41 SOD {08:24:40.41} UT
GRB_PHI:         153.32 [deg]
GRB_THETA:        20.91 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.35 [sigma]
IMAGE_SIGNIF:    8.89 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -1  +0  +0 -44  +0 
SUN_POSTN:       105.46d {+07h 01m 51s}  +22.68d {+22d 40' 31"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.10d {+01h 00m 23s}   +1.07d {+01d 04' 24"}
MOON_DIST:       112.33 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      139.02, 57.47 [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 = 55.30,14.15 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:26:44 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     846395,   Seg_Num: 0
GRB_RA:          181.6438d {+12h 06m 34.5s} (J2000),
                 181.8739d {+12h 07m 29.7s} (current),
                 181.0179d {+12h 04m 04.3s} (1950)
GRB_DEC:         +66.0367d {+66d 02' 12.1"} (J2000),
                 +65.9337d {+65d 56' 01.3"} (current),
                 +66.3150d {+66d 18' 54.1"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       40 [cnts]
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30368.07 SOD {08:26:08.07} UT,   87.7 [sec] since BAT Trigger Time
CENTROID_X:      292.46,  raw= 292  [pixels]
CENTROID_Y:      297.16,  raw= 297  [pixels]
ROLL:            267.15 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -2.90
GRB_POS_XRT_Z:   -32.84
IMAGE_URL:       sw00846395000msxps_rw.img
SUN_POSTN:       105.46d {+07h 01m 51s}  +22.68d {+22d 40' 30"}
SUN_DIST:         63.87 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.11d {+01h 00m 26s}   +1.08d {+01d 04' 41"}
MOON_DIST:       112.32 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.06, 50.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      139.01, 57.46 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:26:33 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     846395,   Seg_Num: 0
GRB_RA:          181.6438d {+12h 06m 34.51s} (J2000),
                 181.8739d {+12h 07m 29.72s} (current),
                 181.0179d {+12h 04m 04.30s} (1950)
GRB_DEC:         +66.0367d {+66d 02' 12.1"} (J2000),
                 +65.9337d {+65d 56' 01.3"} (current),
                 +66.3150d {+66d 18' 54.1"} (1950)
GRB_ERROR:       5.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       7.91e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.32 [sigma]
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30368.07 SOD {08:26:08.07} UT,   87.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.21 261.56 243.37
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       105.46d {+07h 01m 51s}  +22.68d {+22d 40' 30"}
SUN_DIST:         63.87 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.11d {+01h 00m 25s}   +1.08d {+01d 04' 39"}
MOON_DIST:       112.32 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.06, 50.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      139.01, 57.46 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.53 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:26:47 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     846395,   Seg_Num: 0
GRB_RA:          181.6438d {+12h 06m 34.5s} (J2000),
                 181.8739d {+12h 07m 29.7s} (current),
                 181.0179d {+12h 04m 04.3s} (1950)
GRB_DEC:         +66.0367d {+66d 02' 12.1"} (J2000),
                 +65.9337d {+65d 56' 01.3"} (current),
                 +66.3150d {+66d 18' 54.1"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       40 [cnts]
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30368.07 SOD {08:26:08.07} UT,   87.7 [sec] since BAT Trigger Time
CENTROID_X:      292.46,  raw= 292  [pixels]
CENTROID_Y:      297.16,  raw= 297  [pixels]
ROLL:            267.15 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -2.90
GRB_POS_XRT_Z:   -32.84
IMAGE_URL:       sw00846395000msxps_rw.img
SUN_POSTN:       105.46d {+07h 01m 51s}  +22.68d {+22d 40' 30"}
SUN_DIST:         63.87 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.11d {+01h 00m 26s}   +1.08d {+01d 04' 42"}
MOON_DIST:       112.32 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.06, 50.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      139.01, 57.46 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:28:12 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     846395,   Seg_Num: 0
GRB_RA:          181.665d {+12h 06m 40s} (J2000),
                 181.895d {+12h 07m 35s} (current),
                 181.039d {+12h 04m 09s} (1950)
GRB_DEC:         +66.035d {+66d 02' 05"} (J2000),
                 +65.932d {+65d 55' 54"} (current),
                 +66.313d {+66d 18' 47"} (1950)
GRB_DATE:        18305 TJD;   187 DOY;   18/07/06
GRB_TIME:        30280.41 SOD {08:24:40.41} UT
TRIGGER_INDEX:   262
GRB_PHI:         153.32 [deg]
GRB_THETA:        20.91 [deg]
DELTA_TIME:      77.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.35 [sigma]
IMAGE_SIGNIF:    8.89 [sigma]
LC_URL:          sw00846395000msb.lc
SUN_POSTN:       105.46d {+07h 01m 51s}  +22.67d {+22d 40' 30"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.12d {+01h 00m 29s}   +1.08d {+01d 04' 58"}
MOON_DIST:       112.31 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      139.02, 57.47 [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 = 55.30,14.15 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:31:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.667d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.036d {+66d 02' 09"} (J2000)
POINT_ROLL:      267.151d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30375.35 SOD {08:26:15.35} UT,   94.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.954
N_STARS:         10
X_OFFSET:        472 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1431 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00846395000msufc0094.fits
SUN_POSTN:       105.47d {+07h 01m 52s}  +22.67d {+22d 40' 29"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.14d {+01h 00m 34s}   +1.09d {+01d 05' 31"}
MOON_DIST:       112.30 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:31:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.667d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.036d {+66d 02' 09"} (J2000)
POINT_ROLL:      267.151d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30375.35 SOD {08:26:15.35} UT,   94.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.954
N_STARS:         10
X_OFFSET:        472 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1431 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00846395000msufc0094.fits
SUN_POSTN:       105.47d {+07h 01m 52s}  +22.67d {+22d 40' 29"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.14d {+01h 00m 35s}   +1.09d {+01d 05' 32"}
MOON_DIST:       112.30 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:33:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.667d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.036d {+66d 02' 09"} (J2000)
ROLL:            267.151d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30375.35 SOD {08:26:15.35} UT,   94.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     552558396
X_OFFSET:        848 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1008
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00846395000msuni0116.fits
SUN_POSTN:       105.47d {+07h 01m 52s}  +22.67d {+22d 40' 29"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.16d {+01h 00m 39s}   +1.10d {+01d 05' 57"}
MOON_DIST:       112.29 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [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:     Fri 06 Jul 18 08:33:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.667d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.036d {+66d 02' 09"} (J2000)
ROLL:            267.151d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30375.35 SOD {08:26:15.35} UT,   94.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     552558396
X_OFFSET:        848 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1008
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00846395000msuni0116.fits
SUN_POSTN:       105.47d {+07h 01m 52s}  +22.67d {+22d 40' 29"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.16d {+01h 00m 40s}   +1.10d {+01d 05' 59"}
MOON_DIST:       112.29 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [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:     Fri 06 Jul 18 08:38:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.665d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
POINT_ROLL:      267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30587.56 SOD {08:29:47.56} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.493
N_STARS:         7
X_OFFSET:        528 [pixels]
Y_OFFSET:        524 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1483 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00846395000msufc0307.fits
SUN_POSTN:       105.47d {+07h 01m 53s}  +22.67d {+22d 40' 27"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.21d {+01h 00m 50s}   +1.12d {+01d 06' 57"}
MOON_DIST:       112.27 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:38:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.665d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
POINT_ROLL:      267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30587.56 SOD {08:29:47.56} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.493
N_STARS:         7
X_OFFSET:        528 [pixels]
Y_OFFSET:        524 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1483 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00846395000msufc0307.fits
SUN_POSTN:       105.47d {+07h 01m 53s}  +22.67d {+22d 40' 27"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.21d {+01h 00m 50s}   +1.12d {+01d 06' 60"}
MOON_DIST:       112.27 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:39:59 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.665d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
ROLL:            267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30587.56 SOD {08:29:47.56} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     552558608
X_OFFSET:        848 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1008
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00846395000msuni0329.fits
SUN_POSTN:       105.47d {+07h 01m 53s}  +22.67d {+22d 40' 27"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.22d {+01h 00m 52s}   +1.12d {+01d 07' 12"}
MOON_DIST:       112.26 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [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:     Fri 06 Jul 18 08:40:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.665d {+12h 06m 40s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
ROLL:            267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30587.56 SOD {08:29:47.56} UT,   307.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     552558608
X_OFFSET:        848 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1008
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00846395000msuni0329.fits
SUN_POSTN:       105.47d {+07h 01m 53s}  +22.67d {+22d 40' 27"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.22d {+01h 00m 53s}   +1.12d {+01d 07' 15"}
MOON_DIST:       112.26 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [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:     Fri 06 Jul 18 08:39:37 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     846395,   Seg_Num: 0
GRB_RA:          181.6422d {+12h 06m 34.12s} (J2000),
                 181.8723d {+12h 07m 29.34s} (current),
                 181.0163d {+12h 04m 03.91s} (1950)
GRB_DEC:         +66.0364d {+66d 02' 11.0"} (J2000),
                 +65.9334d {+65d 56' 00.2"} (current),
                 +66.3147d {+66d 18' 53.0"} (1950)
GRB_ERROR:       2.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30569.00 SOD {08:29:29.00} UT,   288.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       105.47d {+07h 01m 53s}  +22.67d {+22d 40' 27"}
SUN_DIST:         63.87 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.21d {+01h 00m 52s}   +1.12d {+01d 07' 08"}
MOON_DIST:       112.26 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.06, 50.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      139.01, 57.46 [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:     Fri 06 Jul 18 08:40:55 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     846395,   Seg_Num: 0
GRB_RA:          181.6430d {+12h 06m 34.32s} (J2000),
                 181.8731d {+12h 07m 29.53s} (current),
                 181.0171d {+12h 04m 04.11s} (1950)
GRB_DEC:         +66.0371d {+66d 02' 13.5"} (J2000),
                 +65.9341d {+65d 56' 02.7"} (current),
                 +66.3154d {+66d 18' 55.5"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         17.73 +/- 0.14 [mag]
FILTER:          7, U
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  30584.00 SOD {08:29:44.00} UT,   303.6 [sec] since BAT Trigger Time
SUN_POSTN:       105.47d {+07h 01m 53s}  +22.67d {+22d 40' 27"}
SUN_DIST:         63.87 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.23d {+01h 00m 54s}   +1.12d {+01d 07' 23"}
MOON_DIST:       112.26 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.06, 50.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      139.01, 57.46 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 1.4 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:42:40 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.664d {+12h 06m 39s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
POINT_ROLL:      267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  31141.35 SOD {08:39:01.35} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.663
N_STARS:         28
X_OFFSET:        288 [pixels]
Y_OFFSET:        284 [pixels]
X_MAX:           1727 [pixels]
Y_MAX:           1723 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00846395000msufc0860.fits
SUN_POSTN:       105.47d {+07h 01m 54s}  +22.67d {+22d 40' 26"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.24d {+01h 00m 58s}   +1.13d {+01d 07' 43"}
MOON_DIST:       112.25 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:42:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.664d {+12h 06m 39s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
POINT_ROLL:      267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  31141.35 SOD {08:39:01.35} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.663
N_STARS:         28
X_OFFSET:        288 [pixels]
Y_OFFSET:        284 [pixels]
X_MAX:           1727 [pixels]
Y_MAX:           1723 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw00846395000msufc0860.fits
SUN_POSTN:       105.47d {+07h 01m 54s}  +22.67d {+22d 40' 26"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.24d {+01h 00m 58s}   +1.13d {+01d 07' 44"}
MOON_DIST:       112.25 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #22909
M. Stamatikos (OSU/NASA/GSFC), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), A. D'Ai (INAF-IASFPA), V. D'Elia (ASDC), P. A. Evans (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team:
At 08:24:40 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180706A (trigger=846395). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 181.665, +66.035, which is
```
   RA(J2000)  =  12h 06m 40s
   Dec(J2000) = +66d 02' 05"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two main peaks with a total duration of about 40 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~28 sec after the trigger.
The XRT began observing the field at 08:26:08.0 UT, 87.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 181.6428, 66.0366 which is equivalent to:
```
   RA(J2000)  = 12h 06m 34.28s
   Dec(J2000) = +66d 02' 11.6"
```
with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 32 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.44 x 10^20 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 7.91e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 307 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	12:06:34.34 = 181.64308
  DEC(J2000) = +66:02:13.6  =  66.03712
```
with a 90%-confidence error radius of about 0.77 arc sec. This position is 2.9 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.74 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is M. Stamatikos (Michael.Stamatikos-1 AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:44:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.664d {+12h 06m 39s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
ROLL:            267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  31141.35 SOD {08:39:01.35} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     552559162
X_OFFSET:        847 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1007
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00846395000msuni0882.fits
SUN_POSTN:       105.47d {+07h 01m 54s}  +22.67d {+22d 40' 26"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.25d {+01h 01m 01s}   +1.13d {+01d 08' 00"}
MOON_DIST:       112.25 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 06 Jul 18 08:44:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     846395,   Seg_Num: 0
POINT_RA:        181.664d {+12h 06m 39s} (J2000)
POINT_DEC:       +66.037d {+66d 02' 15"} (J2000)
ROLL:            267.147d
IMG_START_DATE:  18305 TJD;   187 DOY;   18/07/06
IMG_START_TIME:  31141.35 SOD {08:39:01.35} UT,   860.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     552559162
X_OFFSET:        847 [pixels]
Y_OFFSET:        843 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1007
Y_GRB_POS:       1003
BINNING_INDEX:   1
IM_URL:          sw00846395000msuni0882.fits
SUN_POSTN:       105.47d {+07h 01m 54s}  +22.67d {+22d 40' 26"}
SUN_DIST:         63.88 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:       15.25d {+01h 01m 01s}   +1.13d {+01d 08' 03"}
MOON_DIST:       112.25 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      130.05, 50.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.02, 57.47 [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 #22910
Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), and William H. Lee (UNAM) report:
We observed the field of the GRB 180706A (Stamatikos et al., GCN Circ. 22909) with the COATLI 50-cm telescope and interim imager (Watson et al. 2016, Proc. SPIE, 9908, 50) at the Observatorio Astron=F3mico Nacional on the Sierra de San Pedro M=E1rtir from 2018-07-06 08:25:26.83 (29.5 second= s after alert and 46.4 seconds after trigger) to 08:50:34, obtaining 795 seconds of exposure in the w filter.
We detect an uncatalogued source in the XRT error region with a preliminary magnitude of
w = 18.73 +/- 0.08
This magnitude is calibrated against the USNO-B1 catalog (adjusted to an approximate AB system) and is not corrected for Galactic extinction in the direction of the GRB.
At the moment we have no information on fading. Further observations are planned.
We thank the COATLI technical team (Fernando =C1ngeles, Oscar Chapa, Salvador Cuevas, Alejandro Farah, Jorge Fuentes, Rosal=EDa Langarica, Fernando Quir=F3s, and Carlos Tejada) and the staff of the Observatorio Astron=F3mico Nacional.
GCN Circular #22916
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1356 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180706A, 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 = 181.64259, +66.03714 which is equivalent to:
```
RA (J2000): 12h 06m 34.22s
Dec (J2000): +66d 02' 13.7"
```
with an uncertainty of 1.7 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 #22917
A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A. Tohuvavohu (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and M. Stamatikos report on behalf of the Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 180706A (Stamatikos et al. GCN Circ. 22909), from 77 s to 17.9 ks after the BAT trigger. The data comprise 169 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 Osborne et al. (GCN Circ. 22916).
The late-time light curve (from T0+5.5 ks) can be modelled with a power-law decay with a decay index of alpha=0.58 (+0.21, -0.22).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 3.11 (+/-0.09). The best-fitting absorption column is 1.65 (+/-0.18) x 10^21 cm^-2, in excess of the Galactic value of 1.4 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.16 (+0.17, -0.16) and a best-fitting absorption column of 6.7 (+3.7, -3.3) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.0 x 10^-11 (3.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     6.7 (+3.7, -3.3) x 10^20 cm^-2
Galactic foreground: 1.4 x 10^20 cm^-2
Excess significance: 2.6 sigma
Photon index:	     2.16 (+0.17, -0.16)
```
If the light curve continues to decay with a power-law decay index of 0.58, the count rate at T+24 hours will be 0.026 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.7 x 10^-13 (9.3 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00846395.
This circular is an official product of the Swift-XRT team.
GCN Circular #22919
E. Bissaldi (Politecnico & INFN Bari) reports on behalf of the Fermi GBM Team:
"At 08:25:09.03 UT on 06 July 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180706A (trigger 552558314 / 180706351), which was also detected by the Swift/BAT (Stamatikos et al. 2018, GCN 22909). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 60 degrees.
The GBM light curve consists of multiple peaks with a duration (T90) of about 38 s (50-300 keV). The time-averaged spectrum from T0-30 s to T0+10 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.98 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 53 +/- 4 keV.
The event fluence (10-1000 keV) in this time interval is (3.3 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-2 s in the 10-1000 keV band is 4.9 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #22921
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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 180706A (trigger #846395) (Stamatikos et al., GCN Circ. 22909). The BAT ground-calculated position is RA, Dec = 181.687, 66.044 deg which is
```
  RA(J2000)  =  12h 06m 45.0s
  Dec(J2000) = +66d 02' 40.1"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 86%.
The mask-weighted light curve shows a double-peaked structure that starts at ~T-20 s and ends at ~T+50 s. The smaller peak occurs at ~T+2 s, and the larger peak happens at ~T+28 s. T90 (15-350 keV) is 42.7 +- 8.7 sec (estimated error including systematics).
The time-averaged spectrum from T-18.77 to T+50.99 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.90 +- 0.08. The fluence in the 15-150 keV band is 2.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+27.82 sec in the 15-150 keV band is 3.2 +- 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/846395/BA/
GCN Circular #22922
S. R. Oates (U.Warwick) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180706A 95 s after the BAT trigger (Stamatikos et al., GCN Circ. 22909). A source consistent with the XRT position (Osborne et al. GCN Circ. 22916) and the COATLI optical detection (Watson et al. GCN Circ. 22910) is detected in the initial UVOT exposures.
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white (FC)          95          245          147         19.88 +/- 0.34
white              587          607           20         18.11 +/- 0.21
v                  637         1582          117         >18.5
b                  563          756           39         18.34 +/- 0.30
u                  308          557          246         17.90 +/- 0.12
w1                 686         1459           78         18.44 +/- 0.33
m2                 661         1606          117         >18.8
w2                 613         1558          117         >19.1
```
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 #22923
A. Volnova (IKI), I. Reva (FAPHI), E. Mazaeva (IKI), A. Pozanenko (IKI), A. Kusakin (FAPHI), M. Krugov (FAPHI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 180706A (Stamatikos et al., GCN 22909) with Zeiss-1000 telescope of Tien Shan Astronomical Observatory starting on July 06 (UT) 16:18:35. We obtained several images in R-filter. The optical afterglow (Stamatikos et al., GCN 22909; Watson et al., GCN 22910) is clearly detected in a combined image. Preliminary photometry of the afterglow is following.
```
Date        UT start t-T0     Filter Exp.    OT    Err.   UL
                      (mid, days)     (s)

2018-07-06  16:18:35 0.35345  R      29*120  20.65 0.09   22.2
```
The photometry is based on several SDSS-DR12 stars.
Ref.stars
```
SDSS-DR12_id          	R(Lupton)
J120642.39+660133.6	18.5600.025
J120649.22+660218.2	17.5190.018
J120653.24+660249.5	17.9870.017
```
GCN Circular #22924
K.Ulaczyk, D.Steeghs (U. Warwick), G.Ramsay (Armagh O.), M.Dyer (U. Sheffield), B.Gompertz, J.Lyman, A.Levan, R.Cutter (U. Warwick) K. Ackley, D.Galloway, E.Rol (Monash U.), V.Dhillon (U. Sheffield), P.O'Brien, N.Tanvir (U. Leicester), S.Poshyachinda (NARIT), D.Pollacco (U. Warwick), E.Thrane (Monash U.)
report on behalf of the GOTO collaboration:
In response to GRB 180706A (GCN 22909, 22910, 22916, 22917, 22919, 22921), the Gravitational-wave Optical Transient Observer (GOTO) observed the field near the XRT position as reported by Osborne et al. (GCN 22916).
Observations started at 2018-07-06T21:26:42 UT (13 hours after the burst) and ended at 2018-07-06T23:49:54 and consisted of a set of 12x120s exposures in our wide L filter(400-700nm). We did not detect a significant source corresponding to the reported optical counterpart. A stacked image was used to derive a 5-sigma upper limit of V>21.6, after astrometric and photometric (APASS V) calibrations. This is consistent with the photometric evolution between the early optical detections (GCN 22910, 22922) and the TSHAO magnitude reported in Volnova et al. (GCN 22923).
GOTO is operated at the La Palma observing facilities of the University of Warwick on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT) and the Instituto de Astrofisica de Canarias (IAC)
https://goto-observatory.org/
GCN Circular #22989
D. A. Kann, L. Izzo (both HETH/IAA-CSIC) and A. Sota (IAA-CSIC) report on behalf of HETH:
We observed the position of the Swift GRB 180706A (Stamatikos et al., GCN #22909) with the T150 telescope of the Observatorio Sierra Nevada (OSN) near Granada, Spain.
We obtained 6 x 300 s Ic images (mean time after trigger 0.546615 days) and further 5 x 300 s Ic images a night later (mean time after trigger 1.57231 days).
The afterglow (Stamatikos et al., GCN #22909; Watson et al., GCN #22910; Oates et al., GCN #22922; Volnova et al., GCN #22923) is clearly detected in the first night, and we derive Ic = 20.56 +/- 0.06 mag. It is not detected anymore in the second night to a limit of Ic > 22.5. The detection magnitude is in good agreement with the earlier measurement of Volnova et al. when typical Rc-Ic colors of GRBs are taken into account.
The lead author is sorry for the long vacation this data took.

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Jochen Greiner, last update: 21-Jul-2018 [Disclaimer]