Gamma-ray Burst 150626B

(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:     Fri 26 Jun 15 20:23:36 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     646786,   Seg_Num: 0
GRB_RA:          187.672d {+12h 30m 41s} (J2000),
                 187.843d {+12h 31m 22s} (current),
                 187.116d {+12h 28m 28s} (1950)
GRB_DEC:         +66.779d {+66d 46' 45"} (J2000),
                 +66.694d {+66d 41' 38"} (current),
                 +67.055d {+67d 03' 19"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       12757 [cnts]    Image_Peak=259 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   307     E_range: 50-350 keV
BKG_INTEN:       109345 [cnts]
BKG_TIME:        73314.22 SOD {20:21:54.22} UT
BKG_DUR:         40 [sec]
GRB_DATE:        17199 TJD;   177 DOY;   15/06/26
GRB_TIME:        73372.78 SOD {20:22:52.78} UT
GRB_PHI:           8.54 [deg]
GRB_THETA:        44.48 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.12 [sigma]
IMAGE_SIGNIF:    7.54 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +3  -2  +0  +0 -34  +0 
SUN_POSTN:        95.36d {+06h 21m 26s}  +23.35d {+23d 20' 43"}
SUN_DIST:         69.62 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.79d {+13h 59m 09s}   -9.87d {-09d 52' 20"}
MOON_DIST:        78.22 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.13, 50.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      140.93, 59.78 [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 = 303.36,11.33 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 20:25:36 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.606d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.736d {+66d 44' 10"} (J2000)
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73498.94 SOD {20:24:58.94} UT,   126.2 [sec] since BAT Trigger Time
COUNTS:          3    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 20:26:56 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     646786,   Seg_Num: 0
GRB_RA:          187.672d {+12h 30m 41s} (J2000),
                 187.843d {+12h 31m 22s} (current),
                 187.116d {+12h 28m 28s} (1950)
GRB_DEC:         +66.779d {+66d 46' 45"} (J2000),
                 +66.694d {+66d 41' 38"} (current),
                 +67.055d {+67d 03' 19"} (1950)
GRB_DATE:        17199 TJD;   177 DOY;   15/06/26
GRB_TIME:        73372.78 SOD {20:22:52.78} UT
TRIGGER_INDEX:   307
GRB_PHI:           8.54 [deg]
GRB_THETA:        44.48 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.12 [sigma]
IMAGE_SIGNIF:    7.54 [sigma]
LC_URL:          sw00646786000msb.lc
SUN_POSTN:        95.36d {+06h 21m 27s}  +23.35d {+23d 20' 43"}
SUN_DIST:         69.62 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.82d {+13h 59m 16s}   -9.88d {-09d 52' 47"}
MOON_DIST:        78.24 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.13, 50.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      140.93, 59.78 [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 = 303.36,11.33 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 20:28:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.606d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.736d {+66d 44' 09"} (J2000)
POINT_ROLL:      281.625d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73503.78 SOD {20:25:03.78} UT,   131.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.293
N_STARS:         29
X_OFFSET:        532 [pixels]
Y_OFFSET:        927 [pixels]
X_MAX:           1491 [pixels]
Y_MAX:           1886 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    6
SL_URL:          sw00646786000msufc0131.fits
SUN_POSTN:        95.36d {+06h 21m 27s}  +23.35d {+23d 20' 43"}
SUN_DIST:         69.61 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.83d {+13h 59m 19s}   -9.88d {-09d 52' 59"}
MOON_DIST:        78.21 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.17, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 20:28:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.606d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.736d {+66d 44' 09"} (J2000)
POINT_ROLL:      281.625d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73503.78 SOD {20:25:03.78} UT,   131.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.293
N_STARS:         29
X_OFFSET:        532 [pixels]
Y_OFFSET:        927 [pixels]
X_MAX:           1491 [pixels]
Y_MAX:           1886 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    6
SL_URL:          sw00646786000msufc0131.fits
SUN_POSTN:        95.36d {+06h 21m 27s}  +23.35d {+23d 20' 43"}
SUN_DIST:         69.61 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.83d {+13h 59m 20s}   -9.88d {-09d 53' 02"}
MOON_DIST:        78.21 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.17, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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:     Fri 26 Jun 15 20:29:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.606d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.736d {+66d 44' 09"} (J2000)
ROLL:            281.625d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73503.78 SOD {20:25:03.78} UT,   131.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     457043117
X_OFFSET:        851 [pixels]
Y_OFFSET:        1246 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       1406
BINNING_INDEX:   1
IM_URL:          sw00646786000msuni0145.fits
SUN_POSTN:        95.36d {+06h 21m 27s}  +23.35d {+23d 20' 42"}
SUN_DIST:         69.61 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.84d {+13h 59m 22s}   -9.89d {-09d 53' 10"}
MOON_DIST:        78.22 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.17, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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 26 Jun 15 20:29:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.606d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.736d {+66d 44' 09"} (J2000)
ROLL:            281.625d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73503.78 SOD {20:25:03.78} UT,   131.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     457043117
X_OFFSET:        851 [pixels]
Y_OFFSET:        1246 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       1406
BINNING_INDEX:   1
IM_URL:          sw00646786000msuni0145.fits
SUN_POSTN:        95.36d {+06h 21m 27s}  +23.35d {+23d 20' 42"}
SUN_DIST:         69.61 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.84d {+13h 59m 22s}   -9.89d {-09d 53' 12"}
MOON_DIST:        78.22 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.17, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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:     Fri 26 Jun 15 20:29:49 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     646786,   Seg_Num: 0
GRB_RA:          187.6347d {+12h 30m 32.32s} (J2000),
                 187.8062d {+12h 31m 13.47s} (current),
                 187.0778d {+12h 28m 18.67s} (1950)
GRB_DEC:         +66.7712d {+66d 46' 16.3"} (J2000),
                 +66.6858d {+66d 41' 08.8"} (current),
                 +67.0473d {+67d 02' 50.3"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73522.00 SOD {20:25:22.00} UT,   149.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        95.36d {+06h 21m 27s}  +23.35d {+23d 20' 42"}
SUN_DIST:         69.61 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.84d {+13h 59m 22s}   -9.89d {-09d 53' 11"}
MOON_DIST:        78.24 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.15, 50.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      140.92, 59.76 [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:     Fri 26 Jun 15 20:33:15 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 07"} (J2000)
POINT_ROLL:      281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73661.96 SOD {20:27:41.96} UT,   289.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.495
N_STARS:         128
X_OFFSET:        292 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1731 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00646786000msufc0289.fits
SUN_POSTN:        95.37d {+06h 21m 28s}  +23.35d {+23d 20' 42"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.87d {+13h 59m 29s}   -9.89d {-09d 53' 40"}
MOON_DIST:        78.23 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 20:33:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 07"} (J2000)
POINT_ROLL:      281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73661.96 SOD {20:27:41.96} UT,   289.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.495
N_STARS:         128
X_OFFSET:        292 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1731 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00646786000msufc0289.fits
SUN_POSTN:        95.37d {+06h 21m 28s}  +23.35d {+23d 20' 42"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.87d {+13h 59m 29s}   -9.90d {-09d 53' 41"}
MOON_DIST:        78.23 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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:     Fri 26 Jun 15 20:34:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 07"} (J2000)
ROLL:            281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73661.96 SOD {20:27:41.96} UT,   289.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     457043275
X_OFFSET:        851 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00646786000msuni0303.fits
SUN_POSTN:        95.37d {+06h 21m 28s}  +23.35d {+23d 20' 42"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.88d {+13h 59m 31s}   -9.90d {-09d 53' 50"}
MOON_DIST:        78.23 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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 26 Jun 15 20:34:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 07"} (J2000)
ROLL:            281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73661.96 SOD {20:27:41.96} UT,   289.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     457043275
X_OFFSET:        851 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00646786000msuni0303.fits
SUN_POSTN:        95.37d {+06h 21m 28s}  +23.34d {+23d 20' 42"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.88d {+13h 59m 32s}   -9.90d {-09d 53' 53"}
MOON_DIST:        78.23 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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:     Fri 26 Jun 15 20:34:41 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     646786,   Seg_Num: 0
GRB_RA:          187.6341d {+12h 30m 32.18s} (J2000),
                 187.8056d {+12h 31m 13.33s} (current),
                 187.0772d {+12h 28m 18.52s} (1950)
GRB_DEC:         +66.7721d {+66d 46' 19.5"} (J2000),
                 +66.6867d {+66d 41' 12.0"} (current),
                 +67.0482d {+67d 02' 53.5"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  73522.00 SOD {20:25:22.00} UT,   149.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        95.37d {+06h 21m 28s}  +23.34d {+23d 20' 42"}
SUN_DIST:         69.61 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.88d {+13h 59m 31s}   -9.90d {-09d 53' 51"}
MOON_DIST:        78.26 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.15, 50.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      140.92, 59.76 [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 Circular #17966
L. M. McCauley (PSU), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:
At 20:22:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150626B (trigger=646786). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 187.672, +66.779, which is
```
   RA(J2000)  =  12h 30m 41s
   Dec(J2000) = +66d 46' 45"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a FRED-like structure with a duration of about 30 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 20:24:58.9 UT, 126.1 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 187.6342, 66.7722 which is equivalent to:
```
   RA(J2000)  = 12h 30m 32.22s
   Dec(J2000) = +66d 46' 19.8"
```
with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 58 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 (1.69 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 1.1 (+0.98/-0.61) x 10^22 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 131 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 0.01.
Burst Advocate for this burst is L. M. McCauley (marissamc AT swift.psu.edu). 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 26 Jun 15 20:40:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 06"} (J2000)
POINT_ROLL:      281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  74239.64 SOD {20:37:19.64} UT,   866.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.635
N_STARS:         112
X_OFFSET:        292 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1731 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00646786000msufc0866.fits
SUN_POSTN:        95.37d {+06h 21m 29s}  +23.34d {+23d 20' 41"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.93d {+13h 59m 44s}   -9.91d {-09d 54' 42"}
MOON_DIST:        78.25 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 20:41:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 06"} (J2000)
POINT_ROLL:      281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  74239.64 SOD {20:37:19.64} UT,   866.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.635
N_STARS:         112
X_OFFSET:        292 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1731 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00646786000msufc0866.fits
SUN_POSTN:        95.37d {+06h 21m 29s}  +23.34d {+23d 20' 41"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.93d {+13h 59m 44s}   -9.91d {-09d 54' 45"}
MOON_DIST:        78.26 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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:     Fri 26 Jun 15 20:42:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 06"} (J2000)
ROLL:            281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  74239.64 SOD {20:37:19.64} UT,   866.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     457043853
X_OFFSET:        851 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00646786000msuni0880.fits
SUN_POSTN:        95.37d {+06h 21m 29s}  +23.34d {+23d 20' 41"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.94d {+13h 59m 46s}   -9.92d {-09d 54' 54"}
MOON_DIST:        78.26 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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 26 Jun 15 20:42:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     646786,   Seg_Num: 0
POINT_RA:        187.603d {+12h 30m 25s} (J2000)
POINT_DEC:       +66.735d {+66d 44' 06"} (J2000)
ROLL:            281.624d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  74239.64 SOD {20:37:19.64} UT,   866.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     457043853
X_OFFSET:        851 [pixels]
Y_OFFSET:        1167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1011
Y_GRB_POS:       1327
BINNING_INDEX:   1
IM_URL:          sw00646786000msuni0880.fits
SUN_POSTN:        95.37d {+06h 21m 29s}  +23.34d {+23d 20' 41"}
SUN_DIST:         69.60 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:      209.95d {+13h 59m 47s}   -9.92d {-09d 54' 56"}
MOON_DIST:        78.26 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      126.18, 50.26 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      140.96, 59.73 [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 #17967
E. Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov,D.Kuvshinov, Lomonosov Moscow State University, Sternberg Astronomical Institute
Rafael Rebolo, Miquel Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
K.Ivanov, O.Gres, N.M.Budnev, S.Yazev, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB150626B 216 sec after notice time and 260 sec after trigger time at 2015-06-26 20:27:12 UT in two polarizations, directly after automatic weather control system give permit for observations. On our first (50s exposure) set we not found optical transient within SWIFT error-box (McCauley et al. GCN 17966) brighter then 17.5. The 5-sigma upper limit has been about 17.5 mag
MASTER-IAC pointed to the GRB150626B 46 sec after notice time and 90 sec after trigger time at 2015-06-26 2015-06-26 20:24:22 UT, but the images overexposed due to eveninig sky (Sun alt -4 deg.).
The observations is continued. The message may be cited.
GCN Circular #17968
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 591 s of XRT Photon Counting mode data and 1 UVOT images for GRB 150626B, 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 = 187.63331, +66.77177 which is equivalent to:
```
RA (J2000): 12h 30m 31.99s
Dec (J2000): +66d 46' 18.4"
```
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 #17969
D. Xu (NAOC/CAS), J. Telting (NOT), J. P. U. Fynbo (DARK/NBI) report on behalf of a larger collaboration:
We observed the field of GRB 150626B (McCauley et al., GCN 17966) using the 2.56m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. We obtained 2x150s SDSS r-band and 6x180s SDSS z-band frames, with their median time of 1.379 hr and 1.936 hr after the burst, respectively.
No optical source is detected at the (enhanced) XRT position (McCauley et al., GCN 17966; Goad et al., GCN 17968) in our stacked r- and z-band images, down to the limiting magnitudes of r~22.3 mag and z~21.6 mag, respectively.
GCN Circular #17970
M. De Pasquale (UCL-MSSL) and L. M. McCauley (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150626B 131 s after the BAT trigger (McCauley et al., GCN Circ. 17966). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 17968) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           131          281          147         >20.7
u_FC               289          539          246         >20.1
white              131         6476          628         >21.6
v                  620         6887          529         >19.5
b                  545         7647          469         >20.8
u                  289         7502          756         >20.7
w1                 669         7298          529         >20.4
m2                 644         7092          510         >20.3
w2                 595         6682          346         >20.4
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17974
P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), J.P. Osborne (U. Leicester) and L.M. McCauley report on behalf of the Swift-XRT team:
We have analysed 8.9 ks of XRT data for GRB 150626B (McCauley et al. GCN Circ. 17966), from 111 s to 23.5 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 17968). The late-time light curve (from T0+5.3 ks) is consistent with a constant source of mean count rate 1.9e-01 ct/sec. A power-law fit gives an index of 0.2 (+0.6, -0.5).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.99 (+/-0.15). The best-fitting absorption column is 9.6 (+1.4, -1.3) x 10^21 cm^-2, in excess of the Galactic value of 1.7 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 4.8 x 10^-11 (8.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     9.6 (+1.4, -1.3) x 10^21 cm^-2
Galactic foreground: 1.7 x 10^20 cm^-2
Excess significance: 11.7 sigma
Photon index:	     1.99 (+/-0.15)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00646786.
This circular is an official product of the Swift-XRT team.
GCN Circular #17981
S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), L. M. McCauley (PSU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150626B (trigger #646786) (McCauley et al., GCN Circ. 17966). The BAT ground-calculated position is RA, Dec = 187.627, 66.794 deg which is
```
  RA(J2000)  =  12h 30m 30.6s
  Dec(J2000) = +66d 47' 39.6"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 35%.
The mask-weighted light curve shows a single-peaked structure that starts at ~T-15 s, peaks at ~T+1 s, and ends at ~T+30 s. T90 (15-350 keV) is 48.0 +- 22.6 sec (estimated error including systematics).
The time-averaged spectrum from T-15.6 to T+32.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.36 +- 0.21. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+7.94 sec in the 15-150 keV band is 0.6 +- 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/646786/BA/
GCN Circular #17997
K. P. Mooley, G. E. Anderson, R. P. Fender, T. D. Staley (University of Oxford), A. J. van der Horst (George Washington University), A. Rowlinson (CASS)
We observed the position of GRB 150626B (McCauley et al., GCN 17966, Goad et al., GCN 17968) at 16 GHz with the Arcminute Microkelvin Imager (AMI-LA) at 2015 June 26.85, June 27.58, and July 03.56 UT, corresponding to 0.01 days, 0.73 days and 6.71 days post-burst respectively. The GRB flux densities at these three epochs were <0.19 mJy (3 sigma upper limit), 0.17+/-0.05 mJy (marginal detection), and 0.29+/-0.06 mJy (confirmed detection) respectively.
Further AMI monitoring is ongoing. We thank the AMI scheduling team for carrying out these observations.

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Jochen Greiner, last update: 07-Jul-2015 [Disclaimer]