Gamma-ray Burst 080727

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 05:58:57 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     318094,   Seg_Num: 0
GRB_RA:          208.389d {+13h 53m 33s} (J2000),
                 208.506d {+13h 54m 01s} (current),
                 207.705d {+13h 50m 49s} (1950)
GRB_DEC:         -18.549d {-18d 32' 55"} (J2000),
                 -18.591d {-18d 35' 26"} (current),
                 -18.303d {-18d 18' 10"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       22534 [cnts]    Image_Peak=412 [image_cnts]
TRIGGER_DUR:     5.504 [sec] 
TRIGGER_INDEX:   476     E_range: 25-100 keV
BKG_INTEN:       177201 [cnts]
BKG_TIME:        21389.02 SOD {05:56:29.02} UT
BKG_DUR:         48 [sec]
GRB_DATE:        14674 TJD;   209 DOY;   08/07/27
GRB_TIME:        21459.36 SOD {05:57:39.36} UT
GRB_PHI:         -141.55 [deg]
GRB_THETA:        16.93 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.42 [sigma]
IMAGE_SIGNIF:    7.30 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  +3  +0  +0  -3  +1 
SUN_POSTN:       126.92d {+08h 27m 40s}  +19.12d {+19d 06' 59"}
SUN_DIST:         88.48 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.18d {+03h 20m 44s}  +23.84d {+23d 50' 16"}
MOON_DIST:       159.15 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      322.87, 41.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      212.93, -6.46 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 96.48,-12.27 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 05:59:58 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.389d {+13h 53m 33s} (J2000)
POINT_DEC:       -18.549d {-18d 32' 55"} (J2000)
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21568.53 SOD {05:59:28.53} UT,   109.2 [sec] since BAT Trigger Time
COUNTS:          5    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:     Sun 27 Jul 08 06:01:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.389d {+13h 53m 33s} (J2000)
POINT_DEC:       -18.549d {-18d 32' 55"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21572.85 SOD {05:59:32.85} UT,   113.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.585
N_STARS:         27
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0113.fits
SUN_POSTN:       126.92d {+08h 27m 41s}  +19.12d {+19d 06' 57"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.21d {+03h 20m 51s}  +23.84d {+23d 50' 41"}
MOON_DIST:       159.12 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.87, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:01:45 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     318094,   Seg_Num: 0
GRB_RA:          208.389d {+13h 53m 33s} (J2000),
                 208.506d {+13h 54m 01s} (current),
                 207.705d {+13h 50m 49s} (1950)
GRB_DEC:         -18.549d {-18d 32' 55"} (J2000),
                 -18.591d {-18d 35' 26"} (current),
                 -18.303d {-18d 18' 10"} (1950)
GRB_DATE:        14674 TJD;   209 DOY;   08/07/27
GRB_TIME:        21459.36 SOD {05:57:39.36} UT
TRIGGER_INDEX:   476
GRB_PHI:         -141.55 [deg]
GRB_THETA:        16.93 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     5.504 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.42 [sigma]
IMAGE_SIGNIF:    7.30 [sigma]
LC_URL:          sw00318094000msb.lc
SUN_POSTN:       126.92d {+08h 27m 41s}  +19.12d {+19d 06' 57"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.21d {+03h 20m 51s}  +23.84d {+23d 50' 41"}
MOON_DIST:       159.12 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.87, 41.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      212.93, -6.46 [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 = 96.48,-12.27 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:02:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.389d {+13h 53m 33s} (J2000)
POINT_DEC:       -18.549d {-18d 32' 55"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21572.85 SOD {05:59:32.85} UT,   113.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.585
N_STARS:         27
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0113.fits
SUN_POSTN:       126.92d {+08h 27m 41s}  +19.12d {+19d 06' 57"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.22d {+03h 20m 53s}  +23.85d {+23d 50' 47"}
MOON_DIST:       159.11 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.87, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:03:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.389d {+13h 53m 33s} (J2000)
POINT_DEC:       -18.549d {-18d 32' 55"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21572.85 SOD {05:59:32.85} UT,   113.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     238831175
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0113.fits
SUN_POSTN:       126.92d {+08h 27m 41s}  +19.12d {+19d 06' 56"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.23d {+03h 20m 54s}  +23.85d {+23d 50' 52"}
MOON_DIST:       159.11 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.87, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:03:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.389d {+13h 53m 33s} (J2000)
POINT_DEC:       -18.549d {-18d 32' 55"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21572.85 SOD {05:59:32.85} UT,   113.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     238831175
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0113.fits
SUN_POSTN:       126.92d {+08h 27m 41s}  +19.12d {+19d 06' 56"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.23d {+03h 20m 55s}  +23.85d {+23d 50' 56"}
MOON_DIST:       159.10 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.87, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:10:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21678.75 SOD {06:01:18.75} UT,   219.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.597
N_STARS:         37
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0219.fits
SUN_POSTN:       126.93d {+08h 27m 42s}  +19.11d {+19d 06' 52"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.30d {+03h 21m 12s}  +23.86d {+23d 51' 54"}
MOON_DIST:       159.04 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:10:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21678.75 SOD {06:01:18.75} UT,   219.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.597
N_STARS:         37
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0219.fits
SUN_POSTN:       126.93d {+08h 27m 42s}  +19.11d {+19d 06' 52"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.31d {+03h 21m 13s}  +23.87d {+23d 51' 58"}
MOON_DIST:       159.03 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:10:52 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     318094,   Seg_Num: 0
GRB_RA:          208.3909d {+13h 53m 33.8s} (J2000),
                 208.5083d {+13h 54m 01.9s} (current),
                 207.7068d {+13h 50m 49.6s} (1950)
GRB_DEC:         -18.5450d {-18d 32' 42.0"} (J2000),
                 -18.5869d {-18d 35' 13.0"} (current),
                 -18.2993d {-18d 17' 57.4"} (1950)
GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21577.00 SOD {05:59:37.00} UT,   117.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       126.93d {+08h 27m 42s}  +19.11d {+19d 06' 52"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.31d {+03h 21m 14s}  +23.87d {+23d 52' 00"}
MOON_DIST:       159.03 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.91 [deg] galactic lon,lat of the burst
ECL_COORDS:      212.93, -6.46 [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:        This position was enhanced using UVOT field astrometry

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:11:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21678.75 SOD {06:01:18.75} UT,   219.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     238831281
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0219.fits
SUN_POSTN:       126.93d {+08h 27m 42s}  +19.11d {+19d 06' 52"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.31d {+03h 21m 15s}  +23.87d {+23d 52' 06"}
MOON_DIST:       159.03 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:11:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  21678.75 SOD {06:01:18.75} UT,   219.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     238831281
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0219.fits
SUN_POSTN:       126.93d {+08h 27m 42s}  +19.11d {+19d 06' 51"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.32d {+03h 21m 16s}  +23.87d {+23d 52' 08"}
MOON_DIST:       159.02 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:14:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22326.62 SOD {06:12:06.62} UT,   867.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.498
N_STARS:         32
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0867.fits
SUN_POSTN:       126.93d {+08h 27m 43s}  +19.11d {+19d 06' 50"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.34d {+03h 21m 22s}  +23.87d {+23d 52' 29"}
MOON_DIST:       159.00 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:14:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22326.62 SOD {06:12:06.62} UT,   867.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.498
N_STARS:         32
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0867.fits
SUN_POSTN:       126.93d {+08h 27m 43s}  +19.11d {+19d 06' 50"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.35d {+03h 21m 24s}  +23.88d {+23d 52' 34"}
MOON_DIST:       158.99 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:15:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22326.62 SOD {06:12:06.62} UT,   867.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     238831929
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0867.fits
SUN_POSTN:       126.93d {+08h 27m 43s}  +19.11d {+19d 06' 49"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.36d {+03h 21m 26s}  +23.88d {+23d 52' 41"}
MOON_DIST:       158.99 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:15:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22326.62 SOD {06:12:06.62} UT,   867.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     238831929
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0867.fits
SUN_POSTN:       126.93d {+08h 27m 43s}  +19.11d {+19d 06' 49"}
SUN_DIST:         88.47 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.36d {+03h 21m 26s}  +23.88d {+23d 52' 43"}
MOON_DIST:       158.98 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #8021
S. Immler (CRESST/GSFC/UMD), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (NASA/GSFC), S. D. Hunsberger (PSU), W.B Landsman (GSFC), C. B. Markwardt (CRESST/GSFC/UMD), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), D. Perez (U Leicester), T. Sakamoto (NASA/UMBC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 05:57:39 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080727 (trigger=318094). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 208.389, -18.549 which is
```
   RA(J2000) = 13h 53m 33s
   Dec(J2000) = -18d 32' 55"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak structure with a duration of about 5 sec. The peak count rate was ~700 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 05:59:28.5 UT, 109.2 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 208.39099, -18.54505 which is equivalent to:
```
   RA(J2000)  = 13h 53m 33.84s
   Dec(J2000) = -18d 32' 42.2"
```
with an uncertainty of 2.7 arcseconds (radius, 90% containment). This location is 15 arcseconds from the BAT onboard position, within the BAT error circle.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 6.75e+20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 114 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle and 100% of the XRT error circle. The typical 3-sigma upper limit has been about 18.5 mag. 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 0.07.
Burst Advocate for this burst is S. Immler (immler AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:20:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22432.53 SOD {06:13:52.53} UT,   973.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.507
N_STARS:         35
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0973.fits
SUN_POSTN:       126.93d {+08h 27m 44s}  +19.11d {+19d 06' 46"}
SUN_DIST:         88.46 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.41d {+03h 21m 39s}  +23.89d {+23d 53' 28"}
MOON_DIST:       158.93 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 06:21:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
POINT_ROLL:      290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22432.53 SOD {06:13:52.53} UT,   973.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.507
N_STARS:         35
X_OFFSET:        485 [pixels]
Y_OFFSET:        534 [pixels]
X_MAX:           1444 [pixels]
Y_MAX:           1493 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00318094000msufc0973.fits
SUN_POSTN:       126.93d {+08h 27m 44s}  +19.11d {+19d 06' 46"}
SUN_DIST:         88.46 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.42d {+03h 21m 41s}  +23.89d {+23d 53' 32"}
MOON_DIST:       158.93 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:22:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22432.53 SOD {06:13:52.53} UT,   973.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     238832035
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0973.fits
SUN_POSTN:       126.93d {+08h 27m 44s}  +19.11d {+19d 06' 45"}
SUN_DIST:         88.46 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.43d {+03h 21m 43s}  +23.89d {+23d 53' 40"}
MOON_DIST:       158.92 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:     Sun 27 Jul 08 06:22:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     318094,   Seg_Num: 0
POINT_RA:        208.392d {+13h 53m 34s} (J2000)
POINT_DEC:       -18.548d {-18d 32' 51"} (J2000)
ROLL:            290.803d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  22432.53 SOD {06:13:52.53} UT,   973.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     238832035
X_OFFSET:        804 [pixels]
Y_OFFSET:        853 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       964
Y_GRB_POS:       1013
BINNING_INDEX:   1
IM_URL:          sw00318094000msuni0973.fits
SUN_POSTN:       126.93d {+08h 27m 44s}  +19.11d {+19d 06' 45"}
SUN_DIST:         88.46 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       50.43d {+03h 21m 44s}  +23.90d {+23d 53' 43"}
MOON_DIST:       158.92 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      322.88, 41.91 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      212.93, -6.46 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #8025
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 2786 s of XRT Photon Counting mode data and 1 UVOT images for GRB 080727A, 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 = 208.39050, -18.54479 which is equivalent
```
RA (J2000): 13h 53m 33.72s
Dec (J2000): -18d 32' 41.2"
```
with an uncertainty of 1.9 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401 http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an extension of this method.
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #8027
W.B. Landsman (NASA/GSFC/Adnet) and S. Immler (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB080727A starting 113s after the BAT trigger (Immler et al., GCN Circ. 8021). We do not find any source, in any of the UVOT observations, at the UVOT-enhanced XRT position of the afterglow (Evans et al. GCN Circ. 8025). The 3-sigma upper limits for detecting a source at this location in the co-added images are:
```
Filter    T_start   T_stop    Exp(s)    Mag (3-sigma upper limit)
-----------------------------------------------------------------
    v          219     7675     1165    >20.6
    b          700     7083      471    >20.9
    u          675     6878      490    >20.6
   uvw1        650     6673      491    >20.5
   uvm2       1541     6468      236    >20.0
   uvw2        730     7486      471    >20.8
  white        113     7284      623    >21.8
-----------------------------------------------------------------
```
The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 0.07 mag. All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #8028
K.L. Page, J.P. Osborne (U. Leicester) and S. Immler (CRESST/GSFC/UMD) report on behalf of the Swift-XRT team:
We have analysed the first three orbits of data obtained for GRB 080727A (Immler et al., GCN Circ. 8021), covering 7 ks of Photon Counting mode data. The UVOT-enhanced position has been given by Evans et al. (GCM Circ. 8025).
During the first orbit (117s - 1.9 ks after the trigger), the light-curve shows a number of small flares, superimposed on a power-law decay of alpha= 2.01 +0.18/-0.17. The source is no longer detected in the combined second and third orbits of data (5.3 ks of exposure time, starting 5 ks after the trigger). Although the upper limit is consistent with the continued decay of alpha = 2.01, it is not possible to determine whether a break has occurred.
The spectrum from the first orbit of data can be fitted with a power-law of Gamma = 1.43 +0.20/-0.19, absorbed by the Galactic column in this direction (6.75x10^20 cm^-2). The average observed (unabsorbed) flux over this time is 5.56 (6.02) x 10^-12 erg cm^-2 s^-1. The counts to observed flux conversion is 5.3 x 10^-11 erg cm^-2 count^-1.
With the limited information available from a detection only in the first orbit, we are unable confidently to predict the flux at 24 hours.
This is an official product of the Swift-XRT team.
GCN Circular #8029
K. McLean (GSFC/UMD), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (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 080727A (trigger #318094) (Immler, et al., GCN Circ. 8021). The BAT ground-calculated position is RA, Dec = 208.416, -18.572 deg which is
```
   RA(J2000)  =  13h 53m 39.9s 
   Dec(J2000) = -18d 34' 18.6" 
```
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 97%.
The mask-weighted light curve shows a single weak pulse starting at T+~0 and ending a T+~5 sec. T90 (15-350 keV) is 4.9 +- 1.0 sec (estimated error including systematics).
The time-averaged spectrum from T-0.1 to T+5.1 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.25 +- 0.34. The fluence in the 15-150 keV band is 1.3 +- 0.3 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+1.20 sec in the 15-150 keV band is 0.3 +- 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/318094/BA/
GCN Circular #8039
D. Malesani (DARK), P. Jakobsson (Univ. Hertfordshire), A. J. Levan (Univ. Warwick), E. Rol (Univ. Leicester), J. P. U. Fynbo (DARK), report on behalf of a larger collaboration.
We observed the field of GRB 080727A (Immler et al., GCN 8021) with the ESO VLT equipped with FORS1. Observations started on 2008 Jul 27.979 UT, 17.5 hr after the burst, for a total exposure time of 900 s in the R filter.
Inside the refined XRT error circle (Evans et al., GCN 8025), we detect no new source down to a limiting magnitude R~26. Calibration was based on tabulated zeropoints and is in rough agreement with USNO-B1 stars.
We acknowledge kind support from the observing staff at Paranal, particularly Suzanna Randall, Karla Aubel, and Alain Smette.
GCN Circular #8048
A.J. Levan (U. Warwick) and K. Wiersema (U. Leicester) report for a larger collaboration:
We observed the location of GRB 080727A (Immler et al. GCN 8021) using UKIRT. A series of K-band exposures were taken beginning at 06:24:51 UT, roughly 30 minutes after the burst, a total of 720s of observtions were taken (36x20s). We find no evidence for any source within the XRT error circle (Evans et al. GCN 8025) for GRB 080727A, down to a limit of K=19.8 mag (3-sigma).
Comparing this limit to the extrapolated X-ray flux 30 minutes post-burst implies that the observed X-ray to optical/IR spectral slope was beta_KX < ~0.8, thus the non-detection in the IR is likely down to the rapid fading of the afterglow, rather than suppression of the optical/IR flux.
We thank the staff of UKIRT for their rapid response to these alerts.

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Jochen Greiner, last update: 29-Jul-2008 [Disclaimer]