Gamma-ray Burst 180626A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 26 Jun 18 08:21:33 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    8088,   Sub_Num: 1
GRB_RA:         243.5672d {+16h 14m 16s} (J2000),
                243.7798d {+16h 15m 07s} (current),
                242.9924d {+16h 11m 58s} (1950)
GRB_DEC:        +14.7427d {+14d 44' 34"} (J2000),
                +14.6971d {+14d 41' 50"} (current),
                +14.8679d {+14d 52' 05"} (1950)
GRB_ERROR:      2.53 [arcmin, radius, statistical only]
GRB_INTEN:      39.97 [sigma]
GRB_TIME:       30085.64 SOD {08:21:25.64} UT
GRB_DATE:       18295 TJD;   177 DOY;   18/06/26
SC_RA:          242.89 [deg] (J2000)
SC_DEC:          19.71 [deg] (J2000)
SUN_POSTN:       95.12d {+06h 20m 30s}  +23.35d {+23d 21' 10"}
SUN_DIST:       131.14 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:     253.24d {+16h 52m 58s}  -18.44d {-18d 26' 22"}
MOON_DIST:       34.42 [deg]
GAL_COORDS:      28.90, 41.38 [deg] galactic lon,lat of the burst
ECL_COORDS:     238.16, 35.31 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:21:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     844615,   Seg_Num: 0
GRB_RA:          243.567d {+16h 14m 16s} (J2000),
                 243.780d {+16h 15m 07s} (current),
                 242.993d {+16h 11m 58s} (1950)
GRB_DEC:         +14.764d {+14d 45' 52"} (J2000),
                 +14.719d {+14d 43' 08"} (current),
                 +14.890d {+14d 53' 22"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5223 [cnts]    Image_Peak=299 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       28828 [cnts]
BKG_TIME:        30058.83 SOD {08:20:58.83} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18295 TJD;   177 DOY;   18/06/26
GRB_TIME:        30076.94 SOD {08:21:16.94} UT
GRB_PHI:         167.13 [deg]
GRB_THETA:        41.43 [deg]
SOLN_STATUS:     0x30000003
RATE_SIGNIF:     15.96 [sigma]
IMAGE_SIGNIF:    11.71 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +1  +0  +0 +65  +0 
SUN_POSTN:        95.12d {+06h 20m 30s}  +23.35d {+23d 21' 10"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.24d {+16h 52m 58s}  -18.44d {-18d 26' 23"}
MOON_DIST:        34.44 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.93, 41.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      238.16, 35.33 [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 = 203.52,-9.06 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is spatially(0.00<0.1deg) and temporally(6.0<100sec) coincident with the INTEGRAL event (trignum=8088).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 26 Jun 18 08:21:33 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    8088,   Sub_Num: 1
GRB_RA:         243.5672d {+16h 14m 16s} (J2000),
                243.7798d {+16h 15m 07s} (current),
                242.9924d {+16h 11m 58s} (1950)
GRB_DEC:        +14.7427d {+14d 44' 34"} (J2000),
                +14.6971d {+14d 41' 50"} (current),
                +14.8679d {+14d 52' 05"} (1950)
GRB_ERROR:      2.53 [arcmin, radius, statistical only]
GRB_INTEN:      39.97 [sigma]
GRB_TIME:       30085.64 SOD {08:21:25.64} UT
GRB_DATE:       18295 TJD;   177 DOY;   18/06/26
SC_RA:          242.89 [deg] (J2000)
SC_DEC:          19.71 [deg] (J2000)
SUN_POSTN:       95.12d {+06h 20m 30s}  +23.35d {+23d 21' 10"}
SUN_DIST:       131.14 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:     253.24d {+16h 52m 58s}  -18.44d {-18d 26' 22"}
MOON_DIST:       34.42 [deg]
GAL_COORDS:      28.90, 41.38 [deg] galactic lon,lat of the burst
ECL_COORDS:     238.16, 35.31 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:23:25 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.592d {+16h 14m 22s} (J2000)
POINT_DEC:       +14.784d {+14d 47' 01"} (J2000)
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30196.91 SOD {08:23:16.91} UT,   120.0 [sec] since BAT Trigger Time
COUNTS:          7    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/INTEGRAL NOTICE
NOTICE_DATE:    Tue 26 Jun 18 08:24:23 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    8088,   Sub_Num: 2
GRB_RA:         243.5676d {+16h 14m 16s} (J2000),
                243.7802d {+16h 15m 07s} (current),
                242.9929d {+16h 11m 58s} (1950)
GRB_DEC:        +14.7447d {+14d 44' 41"} (J2000),
                +14.6991d {+14d 41' 57"} (current),
                +14.8699d {+14d 52' 12"} (1950)
GRB_ERROR:      2.53 [arcmin, radius, statistical only]
GRB_INTEN:      40.31 [sigma]
GRB_TIME:       30094.64 SOD {08:21:34.64} UT
GRB_DATE:       18295 TJD;   177 DOY;   18/06/26
SC_RA:          242.89 [deg] (J2000)
SC_DEC:          19.71 [deg] (J2000)
SUN_POSTN:       95.13d {+06h 20m 30s}  +23.35d {+23d 21' 09"}
SUN_DIST:       131.14 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:     253.27d {+16h 53m 04s}  -18.44d {-18d 26' 37"}
MOON_DIST:       34.44 [deg]
GAL_COORDS:      28.90, 41.38 [deg] galactic lon,lat of the burst
ECL_COORDS:     238.16, 35.31 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=40.0000 and Time_Error=40.0000.  
COMMENTS:       Possibly real GRB event  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is spatially(0.00<0.1deg) and temporally(18.0<100sec) coincident with the SWIFT_BAT event (trignum=844615).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:24:54 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     844615,   Seg_Num: 0
GRB_RA:          243.567d {+16h 14m 16s} (J2000),
                 243.780d {+16h 15m 07s} (current),
                 242.993d {+16h 11m 58s} (1950)
GRB_DEC:         +14.764d {+14d 45' 52"} (J2000),
                 +14.719d {+14d 43' 08"} (current),
                 +14.890d {+14d 53' 22"} (1950)
GRB_DATE:        18295 TJD;   177 DOY;   18/06/26
GRB_TIME:        30076.94 SOD {08:21:16.94} UT
TRIGGER_INDEX:   148
GRB_PHI:         167.13 [deg]
GRB_THETA:        41.43 [deg]
DELTA_TIME:      -51.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.96 [sigma]
IMAGE_SIGNIF:    11.71 [sigma]
LC_URL:          sw00844615000msb.lc
SUN_POSTN:        95.13d {+06h 20m 30s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.27d {+16h 53m 05s}  -18.44d {-18d 26' 40"}
MOON_DIST:        34.46 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.93, 41.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      238.16, 35.33 [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 = 203.52,-9.06 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:26:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.592d {+16h 14m 22s} (J2000)
POINT_DEC:       +14.783d {+14d 47' 00"} (J2000)
POINT_ROLL:      320.494d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30200.25 SOD {08:23:20.25} UT,   123.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.510
N_STARS:         94
X_OFFSET:        378 [pixels]
Y_OFFSET:        347 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1306 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00844615000msufc0123.fits
SUN_POSTN:        95.13d {+06h 20m 31s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.28d {+16h 53m 08s}  -18.45d {-18d 26' 47"}
MOON_DIST:        34.47 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:26:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.592d {+16h 14m 22s} (J2000)
POINT_DEC:       +14.783d {+14d 47' 00"} (J2000)
POINT_ROLL:      320.494d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30200.25 SOD {08:23:20.25} UT,   123.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.510
N_STARS:         94
X_OFFSET:        378 [pixels]
Y_OFFSET:        347 [pixels]
X_MAX:           1337 [pixels]
Y_MAX:           1306 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00844615000msufc0123.fits
SUN_POSTN:        95.13d {+06h 20m 31s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.29d {+16h 53m 09s}  -18.45d {-18d 26' 49"}
MOON_DIST:        34.47 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [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 26 Jun 18 08:27:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.592d {+16h 14m 22s} (J2000)
POINT_DEC:       +14.783d {+14d 47' 00"} (J2000)
ROLL:            320.494d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30200.25 SOD {08:23:20.25} UT,   123.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     551694221
X_OFFSET:        697 [pixels]
Y_OFFSET:        666 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       826
BINNING_INDEX:   1
IM_URL:          sw00844615000msuni0145.fits
SUN_POSTN:        95.13d {+06h 20m 31s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.29d {+16h 53m 11s}  -18.45d {-18d 26' 54"}
MOON_DIST:        34.48 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [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 26 Jun 18 08:27:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.592d {+16h 14m 22s} (J2000)
POINT_DEC:       +14.783d {+14d 47' 00"} (J2000)
ROLL:            320.494d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30200.25 SOD {08:23:20.25} UT,   123.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     551694221
X_OFFSET:        697 [pixels]
Y_OFFSET:        666 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       826
BINNING_INDEX:   1
IM_URL:          sw00844615000msuni0145.fits
SUN_POSTN:        95.13d {+06h 20m 31s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.30d {+16h 53m 11s}  -18.45d {-18d 26' 55"}
MOON_DIST:        34.48 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:27:01 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     844615,   Seg_Num: 0
GRB_RA:          243.5753d {+16h 14m 18.07s} (J2000),
                 243.7879d {+16h 15m 09.08s} (current),
                 243.0006d {+16h 12m 00.13s} (1950)
GRB_DEC:         +14.7556d {+14d 45' 20.1"} (J2000),
                 +14.7100d {+14d 42' 35.9"} (current),
                 +14.8807d {+14d 52' 50.6"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30222.00 SOD {08:23:42.00} UT,   145.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        95.13d {+06h 20m 31s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.13 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.29d {+16h 53m 09s}  -18.45d {-18d 26' 51"}
MOON_DIST:        34.45 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.92, 41.38 [deg] galactic lon,lat of the burst
ECL_COORDS:      238.17, 35.32 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:29:35 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     844615,   Seg_Num: 0
GRB_RA:          243.5755d {+16h 14m 18.12s} (J2000),
                 243.7881d {+16h 15m 09.13s} (current),
                 243.0008d {+16h 12m 00.18s} (1950)
GRB_DEC:         +14.7570d {+14d 45' 25.1"} (J2000),
                 +14.7114d {+14d 42' 40.9"} (current),
                 +14.8821d {+14d 52' 55.7"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         20.70 +/- 0.23 [mag]
FILTER:          10, White
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30197.00 SOD {08:23:17.00} UT,   120.1 [sec] since BAT Trigger Time
SUN_POSTN:        95.13d {+06h 20m 31s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.13 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.31d {+16h 53m 15s}  -18.45d {-18d 27' 04"}
MOON_DIST:        34.46 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.92, 41.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      238.17, 35.32 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:34:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 59"} (J2000)
POINT_ROLL:      320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30412.79 SOD {08:26:52.79} UT,   335.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.480
N_STARS:         129
X_OFFSET:        138 [pixels]
Y_OFFSET:        107 [pixels]
X_MAX:           1577 [pixels]
Y_MAX:           1546 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00844615000msufc0335.fits
SUN_POSTN:        95.13d {+06h 20m 32s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.35d {+16h 53m 25s}  -18.46d {-18d 27' 29"}
MOON_DIST:        34.50 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:34:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 59"} (J2000)
POINT_ROLL:      320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30412.79 SOD {08:26:52.79} UT,   335.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.480
N_STARS:         129
X_OFFSET:        138 [pixels]
Y_OFFSET:        107 [pixels]
X_MAX:           1577 [pixels]
Y_MAX:           1546 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00844615000msufc0335.fits
SUN_POSTN:        95.13d {+06h 20m 32s}  +23.35d {+23d 21' 09"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.36d {+16h 53m 26s}  -18.46d {-18d 27' 31"}
MOON_DIST:        34.50 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [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 26 Jun 18 08:34:58 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     844615,   Seg_Num: 0
GRB_RA:          243.5757d {+16h 14m 18.16s} (J2000),
                 243.7883d {+16h 15m 09.18s} (current),
                 243.0010d {+16h 12m 00.23s} (1950)
GRB_DEC:         +14.7569d {+14d 45' 24.8"} (J2000),
                 +14.7113d {+14d 42' 40.6"} (current),
                 +14.8820d {+14d 52' 55.3"} (1950)
GRB_ERROR:       2.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30222.00 SOD {08:23:42.00} UT,   145.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        95.13d {+06h 20m 32s}  +23.35d {+23d 21' 08"}
SUN_DIST:        131.13 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.36d {+16h 53m 26s}  -18.46d {-18d 27' 32"}
MOON_DIST:        34.48 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.92, 41.38 [deg] galactic lon,lat of the burst
ECL_COORDS:      238.17, 35.32 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:36:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 59"} (J2000)
ROLL:            320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30412.79 SOD {08:26:52.79} UT,   335.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     551694433
X_OFFSET:        697 [pixels]
Y_OFFSET:        666 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       826
BINNING_INDEX:   1
IM_URL:          sw00844615000msuni0357.fits
SUN_POSTN:        95.13d {+06h 20m 32s}  +23.35d {+23d 21' 08"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.37d {+16h 53m 29s}  -18.46d {-18d 27' 39"}
MOON_DIST:        34.51 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [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).  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:36:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 59"} (J2000)
ROLL:            320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30412.79 SOD {08:26:52.79} UT,   335.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     551694433
X_OFFSET:        697 [pixels]
Y_OFFSET:        666 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       826
BINNING_INDEX:   1
IM_URL:          sw00844615000msuni0357.fits
SUN_POSTN:        95.13d {+06h 20m 32s}  +23.35d {+23d 21' 08"}
SUN_DIST:        131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.37d {+16h 53m 29s}  -18.46d {-18d 27' 40"}
MOON_DIST:        34.51 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [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.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN Circular #22850
P. A. Evans (U Leicester), A. P. Beardmore (U Leicester), J.D. Gropp (PSU), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team:
At 08:21:16 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180626A (trigger=844615). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 243.567, +14.764 which is
```
   RA(J2000) = 16h 14m 16s
   Dec(J2000) = +14d 45' 52"
```
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 50 sec. The peak count rate was ~3400 counts/sec (15-350 keV), at ~-2 sec after the trigger.
The XRT began observing the field at 08:23:16.9 UT, 120.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 243.57544, 14.75598 which is equivalent to:
```
   RA(J2000)  = 16h 14m 18.11s
   Dec(J2000) = +14d 45' 21.5"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 41 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (3.47 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.2 (+2.28/-2.05) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 123 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =  16:14:18.12 = 243.57551
  DEC(J2000) = +14:45:25.5  =  14.75707
```
with a 90%-confidence error radius of about 0.81 arc sec. This position is 5.1 arc sec. from the center of the XRT error circle. The estimated magnitude is 20.71 with a 1-sigma error of about 0.23. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.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/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:54:46 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 60"} (J2000)
POINT_ROLL:      320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30943.02 SOD {08:35:43.02} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.614
N_STARS:         148
X_OFFSET:        138 [pixels]
Y_OFFSET:        107 [pixels]
X_MAX:           1577 [pixels]
Y_MAX:           1546 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00844615000msufc0866.fits
SUN_POSTN:        95.15d {+06h 20m 35s}  +23.35d {+23d 21' 07"}
SUN_DIST:        131.11 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.53d {+16h 54m 08s}  -18.49d {-18d 29' 15"}
MOON_DIST:        34.58 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:54:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 60"} (J2000)
POINT_ROLL:      320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30943.02 SOD {08:35:43.02} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.614
N_STARS:         148
X_OFFSET:        138 [pixels]
Y_OFFSET:        107 [pixels]
X_MAX:           1577 [pixels]
Y_MAX:           1546 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00844615000msufc0866.fits
SUN_POSTN:        95.15d {+06h 20m 35s}  +23.35d {+23d 21' 07"}
SUN_DIST:        131.11 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.53d {+16h 54m 08s}  -18.49d {-18d 29' 16"}
MOON_DIST:        34.58 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 26 Jun 18 08:55:48 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    8088,   Sub_Num: 3
GRB_RA:         243.5714d {+16h 14m 17s} (J2000),
                243.7840d {+16h 15m 08s} (current),
                242.9967d {+16h 11m 59s} (1950)
GRB_DEC:        +14.7485d {+14d 44' 55"} (J2000),
                +14.7029d {+14d 42' 10"} (current),
                +14.8737d {+14d 52' 25"} (1950)
GRB_ERROR:      1.10 [arcmin, radius, statistical only]
GRB_INTEN:      40.31 [sigma]
GRB_TIME:       30094.64 SOD {08:21:34.64} UT
GRB_DATE:       18295 TJD;   177 DOY;   18/06/26
SC_RA:          242.89 [deg] (J2000)
SC_DEC:          19.71 [deg] (J2000)
SUN_POSTN:       95.15d {+06h 20m 36s}  +23.35d {+23d 21' 07"}
SUN_DIST:       131.12 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:     253.54d {+16h 54m 10s}  -18.49d {-18d 29' 20"}
MOON_DIST:       34.56 [deg]
GAL_COORDS:      28.91, 41.38 [deg] galactic lon,lat of the burst
ECL_COORDS:     238.17, 35.31 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=40.0000 and Time_Error=40.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is spatially(0.00<0.1deg) and temporal
ly(18.0<100sec) coincident with the SWIFT_BAT event (trignum=844615).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 26 Jun 18 08:56:51 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 60"} (J2000)
ROLL:            320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30943.02 SOD {08:35:43.02} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     551694964
X_OFFSET:        697 [pixels]
Y_OFFSET:        666 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       826
BINNING_INDEX:   1
IM_URL:          sw00844615000msuni0888.fits
SUN_POSTN:        95.15d {+06h 20m 36s}  +23.35d {+23d 21' 07"}
SUN_DIST:        131.11 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.55d {+16h 54m 12s}  -18.49d {-18d 29' 26"}
MOON_DIST:        34.59 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [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 26 Jun 18 08:57:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     844615,   Seg_Num: 0
POINT_RA:        243.594d {+16h 14m 23s} (J2000)
POINT_DEC:       +14.783d {+14d 46' 60"} (J2000)
ROLL:            320.498d
IMG_START_DATE:  18295 TJD;   177 DOY;   18/06/26
IMG_START_TIME:  30943.02 SOD {08:35:43.02} UT,   866.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     551694964
X_OFFSET:        697 [pixels]
Y_OFFSET:        666 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       857
Y_GRB_POS:       826
BINNING_INDEX:   1
IM_URL:          sw00844615000msuni0888.fits
SUN_POSTN:        95.15d {+06h 20m 36s}  +23.35d {+23d 21' 07"}
SUN_DIST:        131.11 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      253.55d {+16h 54m 12s}  -18.49d {-18d 29' 27"}
MOON_DIST:        34.59 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       28.96, 41.38 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      238.18, 35.35 [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 #22851
D.Gotz (CEA, Saclay), S.Mereghetti (IASF-Milano), C.Ferrigno, E. Bozzo, V.Savche nko (ISDC, Versoix), L. Ducci (IAAT/ISDC) and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 40 s has been detected by IBAS in the IBIS/ISGRI data at 08:21:04 UT of June 26, 2018
The refined coordinates (J2000) are:
```
R.A.= 243.5715  deg
DEC.= 14.7486   deg
```
with an uncertainty of 1.1 arcmin (90% c.l.).
The burst had a measured peak flux of about 2.7 counts/cm2/s (20-200 keV, 1-s in tegration time) and a fluence in the same energy range of about 2e-6 erg/cm2. We note that both those values are lower limits, due to telemetry saturation at sa tellite level. This burst was also detected by the Swift/BAT, XRT and UVOT (Evans et al., GCN 2 2850), and the IBIS position is at 33 arc seconds from the UVOT one.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #22852
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 804 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180626A, 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 = 243.57603, +14.75692 which is equivalent to:
```
RA (J2000): 16h 14m 18.25s
Dec (J2000): +14d 45' 24.9"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #22853
L. Elenin (KIAM), E. Mazaeva (IKI), A. Pozanenko (IKI), A. Volnova (IKI), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 180626A (Evans et al., GCN 22850) with ISON-NM observatory. Observation started 51 s after burst trigger. We do not find optical afterglow (Evans et al., GCN 22850) in a combined image of first 5 frames. Preliminary photometry of the filed is following.
```
Date        UT start t-T0     Filter Exp.    OT   Err.   UL
                      (mid, days)     (s)

2018-06-26  08:22:07 0.00146  CR    5* 20  n/d  n/d    17.3
```
The photometry is based on several nearby USNO-B1.0 stars.
GCN Circular #22854
R. Martone, C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell=20 (U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU), A. Cucchiara=20 (U. of Virgin Islands) on behalf of a large collaboration report:
The LCO 2-m unit at Haleakala Observatory (Hawaii), former FTN, began=20 observing Swift and INTEGRAL GRB 180626A (Evans et al. GCN 22850; Gotz=20 et al. GCN 22851) on June 26, 08:41:11 UT (20 min after the GRB trigger=20 time) with the SDSS ri filters. The optical counterpart (Evans et al.)=20 is clearly detected=A0 with the following magnitudes:
```
Mid Time since GRB=A0=A0=A0 Exposure=A0=A0=A0=A0=A0=A0=A0=A0 Filter=A0=A0=
=A0=A0=A0=A0=A0 Magnitude
(hrs)=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 (s)
------------------------------------------------------------------
0.424=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 5x120=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0 SDSS-R=A0=A0=A0=A0=A0=A0=A0 20.96 +- 0.12
0.617=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 5x120=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0 SDSS-I=A0=A0=A0=A0=A0=A0=A0 20.53 +- 0.12
------------------------------------------------------------------
```
as calibrated against nearby SDSS objects.
GCN Circular #22855
Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM)= , Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesus Gonzalez (UNAM), Carlos Roman-Zuniga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 180626A (Evans, et al., GCN 22850) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronomico Nacional on Sierra San Pedro Martir from 2018/06 26.42 to 2018/06 26.43 UTC (1.61 to 2.06 hours after the BAT trigger), obtaining a total of 0.36 hours exposure in the r and i bands.
For a source at the position of the UVOT counterpart, in comparison with the SDSS DR9 catalog, we obtain the following detections:
```
 =A0 r=A0=A0=A0 =3D 21.57 +/- 0.22
 =A0 i=A0=A0=A0 =3D 20.91 +/- 0.13
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. These magnitudes are fainter than the values reported by Martone et al. (GCN 22854) suggesting that the source is indeed the fading GRB afterglow.
We thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.
GCN Circular #22857
A. A. Breeveld (UCL-MSSL) and P. A. Evans (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180626A 123 s after the BAT trigger (Evans et al., GCN Circ. 22850). A fading source consistent with the XRT position (Osborne et al. GCN Circ. 22852) and also seen by Martone et al. (GCN Circ. 22854) and Troja et al. (GCN Circ. 22855) 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 finding chart (FC) and early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white_FC           123          273          147         20.57 =B1 0.22
white              633         1033          190        >21.4
v                  665         6473          452        >20.2
b                  591         5858          246        >20.4
u                  336         6936          529        >20.7
w1                 714         6882          432        >21.0
m2                5043         6677          393        >20.1
w2                 641         6268          432        >21.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.04 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22859
Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), William H. Lee (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Alexander Kutyrev (GSFC)= , and Eleonora Troja (GSFC) report:
We observed the field of GRB 180626A (Evans et al., GCN 22850) with the COATLI 50-cm telescope and interim imager at the Observatorio Astron=F3mico Nacional on the Sierra de San Pedro M=E1rtir (http://coatli.astroscu.unam.mx) from 2018-06-20 08:21:50.6 to 11:18:41.7 UTC (from 33.7 seconds after the trigger or 17.9 seconds after the alert to 2.95 hours after the trigger), obtaining a total of 7020 seconds of exposure in the w filter.
Within the enhanced XRT error region (Osborne et al., GCN Circ. 22852), we detect the afterglow previously reported by Evans et al. (GCN Circ. 22850), Martone et al. (GCN Circ. 22854), and Breeveld et al. (GCN Circ. 22857) with
w = 21.4 +/- 0.9
In our first set of 30 images each of 5 seconds of exposure, from 08:21:50.6 to 08:27:10.1 UTC, we do not detect the afterglow with a 10-sigma limiting magnitude of
w > 19.2
These magnitudes are calibrated against the Pan-STARRS1 catalog and the USNO-B1 catalog (adjusted to an approximate AB system) and are not corrected for Galactic extinction in the direction of the GRB.
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 #22860
D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), S.L. Gibson (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Tohuvavohu (PSU), S. J. LaPorte (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.6 ks of XRT data for GRB 180626A (Evans et al. GCN Circ. 22850), from 129 s to 22.4 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 22852).
The light curve can be modelled with an initial power-law decay with an index of alpha=0.21 (+0.14, -0.15), followed by a break at T+2992 s to an alpha of 0.90 (+0.11, -0.10).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.01 (+/-0.11). The best-fitting absorption column is 2.2 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 3.5 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.2 (+/-0.4) x 10^21 cm^-2
Galactic foreground: 3.5 x 10^20 cm^-2
Excess significance: 8.0 sigma
Photon index:	     2.01 (+/-0.11)
```
If the light curve continues to decay with a power-law decay index of 0.90, the count rate at T+24 hours will be 0.028 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.0 x 10^-12 (1.4 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00844615.
This circular is an official product of the Swift-XRT team.
GCN Circular #22861
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to GRB 180626A (Evans et al., GCN 22850; Gotz et al., GCN 22851) starting at 08:23:31 UT, 135 s after the Swift/BAT trigger. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. Since the INTEGRAL trigger was received earlier than the Swift trigger, KAIT responed to the INTEGRAL trigger first. Unfortunately the UVOT afterglow location (Evans et al., GCN 22850) is outside our field of view for the first few images. We later manually re-pointed to the UVOT afterglow location starting at 08:52:10 UT about 30 minutes after the Swift/BAT trigger, with the updated exposure time of 60 s per image. We do not detect the afterglow at the reported UVOT location (Evans et al., GCN 22850) in our single image, nor in the co-added images. The typical limiting magnitude of our single clear image is about 19.5 mag calibrated to the PS1 catalog.
GCN Circular #22862
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), 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-239 to T+526 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180626A (trigger #844615) (Evans, et al., GCN Circ. 22850). The BAT ground-calculated position is RA, Dec = 243.569, 14.759 deg which is
```
   RA(J2000)  =  16h 14m 16.6s 
   Dec(J2000) = +14d 45' 32.8" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 35%.
The mask-weighted light curve shows a multi-peaked structure. The first peak is from approximately T-10 to T+5 sec, with a second overlapping peak from T+5 to T+20 sec, followed by a weaker peak from T+20 to T+30 sec. T90 (15-350 keV) is 30.07 +- 1.42 sec (estimated error including systematics).
The time-averaged spectrum from T-10.01 to T+25.59 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.64 +- 0.27, and Epeak of 47.7 +- 12.2 keV (chi squared 40.18 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 4.8 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T-3.69 sec in the 15-150 keV band is 4.1 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.01 +- 0.06 (chi squared 46.26 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/844615/BA/
GCN Circular #22865
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Harv= ey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 180626A (Evans, et al., GCN Circ. 22850) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2018/06 27.16 to 2018/06 27.20 UTC (19.60 to 20.46 hours after the BAT trigger), obtaining a total of 0.71 hours exposure in the r and i bands.
For a source at the position of the UVOT counterpart, in comparison with the SDSS DR9 catalog, we obtain the following detections:
```
  r	=3D 22.39 +/- 0.20
  i	=3D 21.92 +/- 0.15
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
The source flux has faded approximately as t^-0.35 since our previous observations (Troja et al., GCN Circ. 22855).
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #22869
A. Kozlova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long GRB 180626A (Swift-BAT trigger #844615: Evans et al., GCN 22850; Krimm et al., GCN 22862; INTEGRAL detection: Gotz et al., GCN 22851) was detected by Konus-Wind (KW) in the waiting mode.
The burst light curve shows a single emission episode with a duration of ~ 36 s.
As observed by KW, the burst had a fluence of 7.21(-0.79,+0.97)x10^-6 erg/cm2 and a 2.944-s peak flux, measured from ~T0(BAT)-3.841 s, of 3.92(-0.49,+0.58)x10^-7 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
Modeling the KW 3-channel time-integrated spectrum (from ~T0(BAT)-9.7 s to ~T0(BAT)+25.6 s) by a simple power-law model yields a power law index of -2.19(-0.04,+0.05), chi2 = 2.5/1 dof.
The KW light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB180626A/
All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.
GCN Circular #22870
E. Mazaeva (IKI), A. Pozanenko (IKI), A. Kusakin (FAPHI), I. Reva (FAPHI), A. Volnova (IKI), M. Krugov (FAPHI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 180626A (Evans et al., GCN 22850; Gotz et al., GCN 22851) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on June 26 (UT) 16:26:21. We obtained several images in R-filter. The optical afterglow (Evans et al., GCN 22850; Martone et al. GCN 22854; Troja et al. GCN 22855; Watson et al. GCN 22859) is not detected in a stacked image. Preliminary photometry of the field is following.
```
Date        UT start t-T0     Filter Exp.    OT   Err.   UL
                      (mid, days)     (s)

2018-06-26  16:26:21 0.41918  R      99*120  n/d  n/d    21.5
```
The photometry is based on several nearby SDSS-DR10 stars.
Ref.stars
```
SDSS-DR9_id            R(Lupton)
J161422.32+144433.2    15.113
J161357.84+144752.0    13.989
J161440.94+144745.0    13.136
```

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Jochen Greiner, last update: 30-Jun-2018 [Disclaimer]