Gamma-ray Burst 150626A

(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 02:13:09 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     646603,   Seg_Num: 0
GRB_RA:          111.341d {+07h 25m 22s} (J2000),
                 111.477d {+07h 25m 55s} (current),
                 110.901d {+07h 23m 36s} (1950)
GRB_DEC:         -37.764d {-37d 45' 50"} (J2000),
                 -37.796d {-37d 47' 43"} (current),
                 -37.664d {-37d 39' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4335 [cnts]    Image_Peak=179 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       27908 [cnts]
BKG_TIME:        7954.23 SOD {02:12:34.23} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17199 TJD;   177 DOY;   15/06/26
GRB_TIME:        7969.52 SOD {02:12:49.52} UT
GRB_PHI:         -28.58 [deg]
GRB_THETA:        43.81 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     11.87 [sigma]
IMAGE_SIGNIF:    8.71 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -1  +0  +0 -45  +0 
SUN_POSTN:        94.57d {+06h 18m 17s}  +23.37d {+23d 22' 13"}
SUN_DIST:         63.20 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.87d {+13h 23m 30s}   -7.28d {-07d 16' 34"}
MOON_DIST:        85.07 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      123.66,-58.73 [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 = 78.79,-19.33 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(8.0<100sec) coincident with the FERMI_GBM event (trignum=456977580).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:14:57 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     646603,   Seg_Num: 0
GRB_RA:          111.3362d {+07h 25m 20.68s} (J2000),
                 111.4723d {+07h 25m 53.35s} (current),
                 110.8966d {+07h 23m 35.19s} (1950)
GRB_DEC:         -37.7809d {-37d 46' 51.2"} (J2000),
                 -37.8124d {-37d 48' 44.4"} (current),
                 -37.6806d {-37d 40' 50.1"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.03e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.48 [sigma]
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8057.31 SOD {02:14:17.31} UT,   87.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.23 261.67 243.41
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        94.57d {+06h 18m 18s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.21 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.89d {+13h 23m 33s}   -7.28d {-07d 16' 50"}
MOON_DIST:        85.08 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.36,-10.12 [deg] galactic lon,lat of the burst
ECL_COORDS:      123.67,-58.75 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.03 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:15:09 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     646603,   Seg_Num: 0
GRB_RA:          111.3362d {+07h 25m 20.6s} (J2000),
                 111.4723d {+07h 25m 53.3s} (current),
                 110.8966d {+07h 23m 35.1s} (1950)
GRB_DEC:         -37.7809d {-37d 46' 51.2"} (J2000),
                 -37.8124d {-37d 48' 44.4"} (current),
                 -37.6806d {-37d 40' 50.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       110 [cnts]
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8057.31 SOD {02:14:17.31} UT,   87.8 [sec] since BAT Trigger Time
CENTROID_X:      332.40,  raw= 332  [pixels]
CENTROID_Y:      314.10,  raw= 314  [pixels]
ROLL:            342.75 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   38.42
GRB_POS_XRT_Z:   63.88
IMAGE_URL:       sw00646603000msxps_rw.img
SUN_POSTN:        94.57d {+06h 18m 18s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.21 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.89d {+13h 23m 33s}   -7.28d {-07d 16' 52"}
MOON_DIST:        85.09 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.36,-10.12 [deg] galactic lon,lat of the burst
ECL_COORDS:      123.67,-58.75 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:15:16 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     646603,   Seg_Num: 0
GRB_RA:          111.3362d {+07h 25m 20.6s} (J2000),
                 111.4723d {+07h 25m 53.3s} (current),
                 110.8966d {+07h 23m 35.1s} (1950)
GRB_DEC:         -37.7809d {-37d 46' 51.2"} (J2000),
                 -37.8124d {-37d 48' 44.4"} (current),
                 -37.6806d {-37d 40' 50.1"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       110 [cnts]
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8057.31 SOD {02:14:17.31} UT,   87.8 [sec] since BAT Trigger Time
CENTROID_X:      332.40,  raw= 332  [pixels]
CENTROID_Y:      314.10,  raw= 314  [pixels]
ROLL:            342.75 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   38.42
GRB_POS_XRT_Z:   63.88
IMAGE_URL:       sw00646603000msxps_rw.img
SUN_POSTN:        94.57d {+06h 18m 18s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.21 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.89d {+13h 23m 34s}   -7.28d {-07d 16' 53"}
MOON_DIST:        85.09 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.36,-10.12 [deg] galactic lon,lat of the burst
ECL_COORDS:      123.67,-58.75 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:16:30 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     646603,   Seg_Num: 0
GRB_RA:          111.341d {+07h 25m 22s} (J2000),
                 111.477d {+07h 25m 55s} (current),
                 110.901d {+07h 23m 36s} (1950)
GRB_DEC:         -37.764d {-37d 45' 50"} (J2000),
                 -37.796d {-37d 47' 43"} (current),
                 -37.664d {-37d 39' 49"} (1950)
GRB_DATE:        17199 TJD;   177 DOY;   15/06/26
GRB_TIME:        7969.52 SOD {02:12:49.52} UT
TRIGGER_INDEX:   148
GRB_PHI:         -28.58 [deg]
GRB_THETA:        43.81 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.87 [sigma]
IMAGE_SIGNIF:    8.71 [sigma]
LC_URL:          sw00646603000msb.lc
SUN_POSTN:        94.57d {+06h 18m 18s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.20 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.90d {+13h 23m 36s}   -7.28d {-07d 17' 04"}
MOON_DIST:        85.09 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      123.66,-58.73 [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 = 78.79,-19.33 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:18:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.343d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.760d {-37d 45' 35"} (J2000)
POINT_ROLL:      342.747d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8067.61 SOD {02:14:27.61} UT,   98.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.485
N_STARS:         186
X_OFFSET:        338 [pixels]
Y_OFFSET:        558 [pixels]
X_MAX:           1297 [pixels]
Y_MAX:           1517 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00646603000msufc0098.fits
SUN_POSTN:        94.58d {+06h 18m 18s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.92d {+13h 23m 40s}   -7.29d {-07d 17' 20"}
MOON_DIST:        85.10 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.35,-10.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 02:18:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.343d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.760d {-37d 45' 35"} (J2000)
POINT_ROLL:      342.747d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8067.61 SOD {02:14:27.61} UT,   98.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.485
N_STARS:         186
X_OFFSET:        338 [pixels]
Y_OFFSET:        558 [pixels]
X_MAX:           1297 [pixels]
Y_MAX:           1517 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00646603000msufc0098.fits
SUN_POSTN:        94.58d {+06h 18m 18s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.92d {+13h 23m 41s}   -7.29d {-07d 17' 25"}
MOON_DIST:        85.10 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.35,-10.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 02:21:24 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.343d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.760d {-37d 45' 35"} (J2000)
ROLL:            342.747d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8067.61 SOD {02:14:27.61} UT,   98.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456977681
X_OFFSET:        658 [pixels]
Y_OFFSET:        878 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       818
Y_GRB_POS:       1038
BINNING_INDEX:   1
IM_URL:          sw00646603000msuni0112.fits
SUN_POSTN:        94.58d {+06h 18m 19s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.94d {+13h 23m 46s}   -7.30d {-07d 17' 47"}
MOON_DIST:        85.11 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.35,-10.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:21:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.343d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.760d {-37d 45' 35"} (J2000)
ROLL:            342.747d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8067.61 SOD {02:14:27.61} UT,   98.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456977681
X_OFFSET:        658 [pixels]
Y_OFFSET:        878 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       818
Y_GRB_POS:       1038
BINNING_INDEX:   1
IM_URL:          sw00646603000msuni0112.fits
SUN_POSTN:        94.58d {+06h 18m 19s}  +23.37d {+23d 22' 12"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.94d {+13h 23m 46s}   -7.30d {-07d 17' 49"}
MOON_DIST:        85.11 [deg]
MOON_ILLUM:      65 [%]
GAL_COORDS:      250.35,-10.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #17960
T. G. R. Roegiers (PSU), S. D. Barthelmy (GSFC), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 02:12:49 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150626A (trigger=646603). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 111.341, -37.764 which is
```
   RA(J2000) = 07h 25m 22s
   Dec(J2000) = -37d 45' 50"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 02:14:17.3 UT, 87.8 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 111.33758, -37.78043 which is equivalent to:
```
   RA(J2000)  = 07h 25m 21.02s
   Dec(J2000) = -37d 46' 49.5"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 59 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 3.51 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 3.03e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 98 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 coverage of the XRT error circle by the 8'x8' region for the list of sources generated on-board is uncertain because the large number of sources filled the available telemetry. 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 0.36.
Burst Advocate for this burst is T. G. R. Roegiers (troegiers 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 02:27:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 43"} (J2000)
POINT_ROLL:      342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8280.46 SOD {02:18:00.46} UT,   310.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.847
N_STARS:         113
X_OFFSET:        338 [pixels]
Y_OFFSET:        558 [pixels]
X_MAX:           1297 [pixels]
Y_MAX:           1517 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00646603000msufc0310.fits
SUN_POSTN:        94.58d {+06h 18m 20s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.99d {+13h 23m 57s}   -7.31d {-07d 18' 41"}
MOON_DIST:        85.14 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 02:28:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 43"} (J2000)
POINT_ROLL:      342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8280.46 SOD {02:18:00.46} UT,   310.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.847
N_STARS:         113
X_OFFSET:        338 [pixels]
Y_OFFSET:        558 [pixels]
X_MAX:           1297 [pixels]
Y_MAX:           1517 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00646603000msufc0310.fits
SUN_POSTN:        94.58d {+06h 18m 20s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      200.99d {+13h 23m 59s}   -7.31d {-07d 18' 46"}
MOON_DIST:        85.15 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 02:29:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 43"} (J2000)
ROLL:            342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8280.46 SOD {02:18:00.46} UT,   310.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     456977894
X_OFFSET:        658 [pixels]
Y_OFFSET:        878 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       818
Y_GRB_POS:       1038
BINNING_INDEX:   1
IM_URL:          sw00646603000msuni0324.fits
SUN_POSTN:        94.58d {+06h 18m 20s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      201.00d {+13h 24m 00s}   -7.32d {-07d 18' 54"}
MOON_DIST:        85.15 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:28:16 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     646603,   Seg_Num: 0
GRB_RA:          111.3363d {+07h 25m 20.71s} (J2000),
                 111.4724d {+07h 25m 53.38s} (current),
                 110.8967d {+07h 23m 35.21s} (1950)
GRB_DEC:         -37.7804d {-37d 46' 49.4"} (J2000),
                 -37.8119d {-37d 48' 42.6"} (current),
                 -37.6801d {-37d 40' 48.3"} (1950)
GRB_ERROR:       2.2 [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:  8283.00 SOD {02:18:03.00} UT,   313.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        94.58d {+06h 18m 20s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.21 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      201.00d {+13h 23m 59s}   -7.31d {-07d 18' 47"}
MOON_DIST:        85.15 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.36,-10.12 [deg] galactic lon,lat of the burst
ECL_COORDS:      123.67,-58.75 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:28:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 43"} (J2000)
ROLL:            342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8280.46 SOD {02:18:00.46} UT,   310.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     456977894
X_OFFSET:        658 [pixels]
Y_OFFSET:        878 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       818
Y_GRB_POS:       1038
BINNING_INDEX:   1
IM_URL:          sw00646603000msuni0324.fits
SUN_POSTN:        94.58d {+06h 18m 20s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      201.00d {+13h 24m 00s}   -7.31d {-07d 18' 52"}
MOON_DIST:        85.15 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Jun 15 02:33:06 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 42"} (J2000)
POINT_ROLL:      342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8834.87 SOD {02:27:14.87} UT,   865.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.829
N_STARS:         190
X_OFFSET:        98 [pixels]
Y_OFFSET:        318 [pixels]
X_MAX:           1537 [pixels]
Y_MAX:           1757 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00646603000msufc0865.fits
SUN_POSTN:        94.59d {+06h 18m 21s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      201.03d {+13h 24m 08s}   -7.33d {-07d 19' 30"}
MOON_DIST:        85.17 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 02:33:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 42"} (J2000)
POINT_ROLL:      342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8834.87 SOD {02:27:14.87} UT,   865.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.829
N_STARS:         190
X_OFFSET:        98 [pixels]
Y_OFFSET:        318 [pixels]
X_MAX:           1537 [pixels]
Y_MAX:           1757 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00646603000msufc0865.fits
SUN_POSTN:        94.59d {+06h 18m 21s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      201.04d {+13h 24m 09s}   -7.33d {-07d 19' 33"}
MOON_DIST:        85.17 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 02:34:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 42"} (J2000)
ROLL:            342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8834.87 SOD {02:27:14.87} UT,   865.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456978448
X_OFFSET:        657 [pixels]
Y_OFFSET:        877 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       817
Y_GRB_POS:       1037
BINNING_INDEX:   1
IM_URL:          sw00646603000msuni0879.fits
SUN_POSTN:        94.59d {+06h 18m 21s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      201.05d {+13h 24m 11s}   -7.33d {-07d 19' 43"}
MOON_DIST:        85.18 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 02:34:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     646603,   Seg_Num: 0
POINT_RA:        111.341d {+07h 25m 22s} (J2000)
POINT_DEC:       -37.762d {-37d 45' 42"} (J2000)
ROLL:            342.749d
IMG_START_DATE:  17199 TJD;   177 DOY;   15/06/26
IMG_START_TIME:  8834.87 SOD {02:27:14.87} UT,   865.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     456978448
X_OFFSET:        657 [pixels]
Y_OFFSET:        877 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       817
Y_GRB_POS:       1037
BINNING_INDEX:   1
IM_URL:          sw00646603000msuni0879.fits
SUN_POSTN:        94.59d {+06h 18m 21s}  +23.37d {+23d 22' 11"}
SUN_DIST:         63.19 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:      201.05d {+13h 24m 11s}   -7.33d {-07d 19' 44"}
MOON_DIST:        85.18 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      250.35,-10.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      123.66,-58.73 [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 #17961
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 150626A, we find an enhanced XRT position of the afterglow: RA, Dec: 111.3364, -37.7804 which is equivalent to:
```
   RA (J2000)  = 07 25 20.74
   Dec (J2000) = -37 46 49.5
```
with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/646603.
Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #17962
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 2166 s of XRT Photon Counting mode data and 1 UVOT images for GRB 150626A, 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 = 111.33677, -37.78081 which is equivalent to:
```
RA (J2000): 07h 25m 20.82s
Dec (J2000): -37d 46' 50.9"
```
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 #17964
M. De Pasquale (UCL-MSSL) and T. Roegiers (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150626A 98 s after the BAT trigger (Roegiers et al., GCN Circ. 17960). No optical afterglow consistent with the XRT position (Evans GCN Circ. 17961) 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) exposures and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            98          248          147         >20.4
u_FC               311          561          246         >19.6

white               98         1540          392         >21.1
u                  311         1490          324         >19.8
v                  641         1590           95         >18.8
b                  566         1514           97         >19.7
uw1                690         1465           78         >18.8
um2                665         1440           97         >18.6
uw2                616         1390           97         >19.0
```
The magnitudes in the table are not corrected for the substantial Galactic extinction due to the reddening of E(B-V) = 0.37 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17965
V. Mangano (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), M.C. Stroh (PSU), D.N. Burrows (PSU) and T.G.R. Roegiers report on behalf of the Swift-XRT team:
We have analysed 9.2 ks of XRT data for GRB 150626A (Roegiers et al. GCN Circ. 17960), from 77 s to 31.2 ks after the BAT trigger. The data comprise 206 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 Evans et al. (GCN Circ. 17961).
The late-time light curve (from T0+6.3 ks) can be modelled with a power-law decay with a decay index of alpha=0.65 (+/-0.17).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.08 (+/-0.06). The best-fitting absorption column is 3.74 (+0.31, -0.24) x 10^21 cm^-2, consistent with the Galactic value of 3.5 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.06 (+0.19, -0.18) and a best-fitting absorption column of 4.5 (+1.0, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (6.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.5 (+1.0, -0.9) x 10^21 cm^-2
Galactic foreground: 3.5 x 10^21 cm^-2
Excess significance: 1.8 sigma
Photon index:	     2.06 (+0.19, -0.18)
```
If the light curve continues to decay with a power-law decay index of 0.65, the count rate at T+24 hours will be 0.018 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.8 x 10^-13 (1.1 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00646603.
This circular is an official product of the Swift-XRT team.
GCN Circular #17973
T. N. Ukwatta (LANL), 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), D. M. Palmer (LANL), T. G. R. Roegiers (PSU), T. Sakamoto (AGU), M. Stamatikos (OSU), (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150626A (trigger #646603) (Roegiers, et al., GCN Circ. 17960). The BAT ground-calculated position is RA, Dec = 111.353, -37.803 deg which is
```
  RA(J2000)  =  07h 25m 24.8s 
  Dec(J2000) = -37d 48' 10.8" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%.
The mask-weighted lightcurve shows overlapping peaks starting at ~T-35 sec, peaking at ~T+2 sec, and ending at ~T+140 sec. T90 (15-350 keV) is 144 +- 66 sec (estimated error including systematics).
The time-averaged spectrum from T-47.30 to T+144.70 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.11 +- 0.19. The fluence in the 15-150 keV band is 1.8 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+8.20 sec in the 15-150 keV band is 0.4 +- 0.3 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/646603/BA/

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Jochen Greiner, last update: 27-Jun-2015 [Disclaimer]