Gamma-ray Burst 080727C

(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 23:08:00 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     318170,   Seg_Num: 0
GRB_RA:           32.645d {+02h 10m 35s} (J2000),
                  32.808d {+02h 11m 14s} (current),
                  31.700d {+02h 06m 48s} (1950)
GRB_DEC:         +64.151d {+64d 09' 05"} (J2000),
                 +64.192d {+64d 11' 30"} (current),
                 +63.916d {+63d 54' 57"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4580 [cnts]    Image_Peak=205 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       29022 [cnts]
BKG_TIME:        83237.02 SOD {23:07:17.02} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14674 TJD;   209 DOY;   08/07/27
GRB_TIME:        83255.39 SOD {23:07:35.39} UT
GRB_PHI:         -64.70 [deg]
GRB_THETA:        20.23 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.34 [sigma]
IMAGE_SIGNIF:    7.95 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +9  +0  +1 -25  +1 
SUN_POSTN:       127.62d {+08h 30m 29s}  +18.95d {+18d 57' 07"}
SUN_DIST:         75.06 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.28d {+04h 05m 06s}  +25.95d {+25d 56' 59"}
MOON_DIST:        42.43 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.43,  2.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.39, 47.07 [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 = 128.71,9.34 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 23:09:31 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     318170,   Seg_Num: 0
GRB_RA:           32.6259d {+02h 10m 30.2s} (J2000),
                  32.7889d {+02h 11m 09.3s} (current),
                  31.6814d {+02h 06m 43.5s} (1950)
GRB_DEC:         +64.1348d {+64d 08' 05.2"} (J2000),
                 +64.1750d {+64d 10' 29.8"} (current),
                 +63.8991d {+63d 53' 56.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       43 [cnts]
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83327.91 SOD {23:08:47.91} UT,   72.5 [sec] since BAT Trigger Time
CENTROID_X:      305.93,  raw= 306  [pixels]
CENTROID_Y:      265.34,  raw= 265  [pixels]
ROLL:            77.08 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -76.98
GRB_POS_XRT_Z:   8.57
IMAGE_URL:       sw00318170000msxps_rw.img
SUN_POSTN:       127.62d {+08h 30m 29s}  +18.95d {+18d 57' 06"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.29d {+04h 05m 10s}  +25.95d {+25d 57' 08"}
MOON_DIST:        42.43 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.57 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.36, 47.06 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 23:09:25 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     318170,   Seg_Num: 0
GRB_RA:           32.6259d {+02h 10m 30.2s} (J2000),
                  32.7889d {+02h 11m 09.3s} (current),
                  31.6814d {+02h 06m 43.5s} (1950)
GRB_DEC:         +64.1348d {+64d 08' 05.2"} (J2000),
                 +64.1750d {+64d 10' 29.8"} (current),
                 +63.8991d {+63d 53' 56.7"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       43 [cnts]
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83327.91 SOD {23:08:47.91} UT,   72.5 [sec] since BAT Trigger Time
CENTROID_X:      305.93,  raw= 306  [pixels]
CENTROID_Y:      265.34,  raw= 265  [pixels]
ROLL:            77.08 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -76.98
GRB_POS_XRT_Z:   8.57
IMAGE_URL:       sw00318170000msxps_rw.img
SUN_POSTN:       127.62d {+08h 30m 29s}  +18.95d {+18d 57' 06"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.29d {+04h 05m 10s}  +25.95d {+25d 57' 08"}
MOON_DIST:        42.43 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.57 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.36, 47.06 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 23:09:16 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     318170,   Seg_Num: 0
GRB_RA:           32.6259d {+02h 10m 30.2s} (J2000),
                  32.7889d {+02h 11m 09.3s} (current),
                  31.6814d {+02h 06m 43.5s} (1950)
GRB_DEC:         +64.1348d {+64d 08' 05.2"} (J2000),
                 +64.1750d {+64d 10' 29.8"} (current),
                 +63.8991d {+63d 53' 56.7"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.30e-09 [erg/cm2/sec]
GRB_SIGNIF:      6.55 [sigma]
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83327.91 SOD {23:08:47.91} UT,   72.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.58 237.23 261.21 243.41
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       127.62d {+08h 30m 29s}  +18.95d {+18d 57' 06"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.29d {+04h 05m 10s}  +25.95d {+25d 57' 07"}
MOON_DIST:        42.43 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.57 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.36, 47.06 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.12 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 23:11:28 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     318170,   Seg_Num: 0
GRB_RA:           32.645d {+02h 10m 35s} (J2000),
                  32.808d {+02h 11m 14s} (current),
                  31.700d {+02h 06m 48s} (1950)
GRB_DEC:         +64.151d {+64d 09' 05"} (J2000),
                 +64.192d {+64d 11' 30"} (current),
                 +63.916d {+63d 54' 57"} (1950)
GRB_DATE:        14674 TJD;   209 DOY;   08/07/27
GRB_TIME:        83255.39 SOD {23:07:35.39} UT
TRIGGER_INDEX:   146
GRB_PHI:         -64.70 [deg]
GRB_THETA:        20.23 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.34 [sigma]
IMAGE_SIGNIF:    7.95 [sigma]
LC_URL:          sw00318170000msb.lc
SUN_POSTN:       127.62d {+08h 30m 29s}  +18.95d {+18d 57' 05"}
SUN_DIST:         75.06 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.31d {+04h 05m 15s}  +25.96d {+25d 57' 20"}
MOON_DIST:        42.44 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.43,  2.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.39, 47.07 [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 = 128.71,9.34 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 27 Jul 08 23:12:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.625d {+02h 10m 30s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 21"} (J2000)
POINT_ROLL:      77.082d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83336.29 SOD {23:08:56.29} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.603
N_STARS:         190
X_OFFSET:        560 [pixels]
Y_OFFSET:        568 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1527 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00318170000msufc0080.fits
SUN_POSTN:       127.62d {+08h 30m 29s}  +18.95d {+18d 57' 04"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.32d {+04h 05m 17s}  +25.96d {+25d 57' 24"}
MOON_DIST:        42.45 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.07 [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 23:12:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.625d {+02h 10m 30s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 21"} (J2000)
POINT_ROLL:      77.082d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83336.29 SOD {23:08:56.29} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.603
N_STARS:         190
X_OFFSET:        560 [pixels]
Y_OFFSET:        568 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1527 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00318170000msufc0080.fits
SUN_POSTN:       127.62d {+08h 30m 30s}  +18.95d {+18d 57' 04"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.33d {+04h 05m 19s}  +25.96d {+25d 57' 28"}
MOON_DIST:        42.45 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.07 [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 23:14:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.625d {+02h 10m 30s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 21"} (J2000)
ROLL:            77.082d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83336.29 SOD {23:08:56.29} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     238892939
X_OFFSET:        863 [pixels]
Y_OFFSET:        1018 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1178
BINNING_INDEX:   1
IM_URL:          sw00318170000msuni0080.fits
SUN_POSTN:       127.62d {+08h 30m 30s}  +18.95d {+18d 57' 03"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.34d {+04h 05m 22s}  +25.96d {+25d 57' 35"}
MOON_DIST:        42.45 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.07 [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:        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 23:13:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.625d {+02h 10m 30s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 21"} (J2000)
ROLL:            77.082d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83336.29 SOD {23:08:56.29} UT,   80.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     238892939
X_OFFSET:        863 [pixels]
Y_OFFSET:        1018 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1178
BINNING_INDEX:   1
IM_URL:          sw00318170000msuni0080.fits
SUN_POSTN:       127.62d {+08h 30m 30s}  +18.95d {+18d 57' 03"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.34d {+04h 05m 21s}  +25.96d {+25d 57' 33"}
MOON_DIST:        42.45 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.07 [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:     Sun 27 Jul 08 23:21:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.618d {+02h 10m 28s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 22"} (J2000)
POINT_ROLL:      77.076d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83442.42 SOD {23:10:42.42} UT,   187.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        4.528
N_STARS:         190
X_OFFSET:        543 [pixels]
Y_OFFSET:        698 [pixels]
X_MAX:           1502 [pixels]
Y_MAX:           1657 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00318170000msufc0187.fits
SUN_POSTN:       127.63d {+08h 30m 31s}  +18.95d {+18d 56' 59"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.42d {+04h 05m 42s}  +25.97d {+25d 58' 19"}
MOON_DIST:        42.46 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.08 [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 23:22:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.618d {+02h 10m 28s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 22"} (J2000)
POINT_ROLL:      77.076d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83442.42 SOD {23:10:42.42} UT,   187.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        4.528
N_STARS:         190
X_OFFSET:        543 [pixels]
Y_OFFSET:        698 [pixels]
X_MAX:           1502 [pixels]
Y_MAX:           1657 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00318170000msufc0187.fits
SUN_POSTN:       127.63d {+08h 30m 31s}  +18.95d {+18d 56' 58"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.43d {+04h 05m 44s}  +25.97d {+25d 58' 23"}
MOON_DIST:        42.46 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.08 [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 23:23:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.618d {+02h 10m 28s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 22"} (J2000)
ROLL:            77.076d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83442.42 SOD {23:10:42.42} UT,   187.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     238893045
X_OFFSET:        863 [pixels]
Y_OFFSET:        1018 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1178
BINNING_INDEX:   1
IM_URL:          sw00318170000msuni0187.fits
SUN_POSTN:       127.63d {+08h 30m 31s}  +18.95d {+18d 56' 58"}
SUN_DIST:         75.08 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.45d {+04h 05m 47s}  +25.98d {+25d 58' 30"}
MOON_DIST:        42.47 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.08 [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:        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 23:22:56 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     318170,   Seg_Num: 0
POINT_RA:         32.618d {+02h 10m 28s} (J2000)
POINT_DEC:       +64.156d {+64d 09' 22"} (J2000)
ROLL:            77.076d
IMG_START_DATE:  14674 TJD;   209 DOY;   08/07/27
IMG_START_TIME:  83442.42 SOD {23:10:42.42} UT,   187.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     238893045
X_OFFSET:        863 [pixels]
Y_OFFSET:        1018 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1178
BINNING_INDEX:   1
IM_URL:          sw00318170000msuni0187.fits
SUN_POSTN:       127.63d {+08h 30m 31s}  +18.95d {+18d 56' 58"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.44d {+04h 05m 46s}  +25.97d {+25d 58' 28"}
MOON_DIST:        42.47 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.42,  2.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.38, 47.08 [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:     Sun 27 Jul 08 23:23:51 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     318170,   Seg_Num: 0
GRB_RA:           32.6338d {+02h 10m 32.1s} (J2000),
                  32.7969d {+02h 11m 11.2s} (current),
                  31.6892d {+02h 06m 45.4s} (1950)
GRB_DEC:         +64.1377d {+64d 08' 15.7"} (J2000),
                 +64.1778d {+64d 10' 40.2"} (current),
                 +63.9020d {+63d 54' 07.2"} (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:  83394.00 SOD {23:09:54.00} UT,   138.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       127.63d {+08h 30m 31s}  +18.95d {+18d 56' 57"}
SUN_DIST:         75.07 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       61.45d {+04h 05m 48s}  +25.98d {+25d 58' 33"}
MOON_DIST:        42.45 [deg]
MOON_ILLUM:      26 [%]
GAL_COORDS:      131.43,  2.58 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.37, 47.06 [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

GCN Circular #8035
A. M. Parsons (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), S. D. Hunsberger (PSU), J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), D. Perez (U Leicester), T. Sakamoto (NASA/UMBC), R. L. C. Starling (U Leicester), M. C. Stroh (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 23:07:35 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080727C (trigger=318170). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 32.645, +64.151 which is
```
   RA(J2000)  = 02h 10m 35s
   Dec(J2000) = +64d 09' 05"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a duration of about 100 sec. The peak count rate was ~3500 counts/sec (15-350 keV), at ~25 sec after the trigger.
The XRT began observing the field at 23:08:47.9 UT, 72.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 32.63384, 64.13771 which is equivalent to:
```
   RA(J2000)  = 02h 10m 32.12s
   Dec(J2000) = +64d 08' 15.8"
```
with an uncertainty of 2.8 arcseconds (radius, 90% containment). This location is 50 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 in excess of the Galactic value (6.78e+21 cm^-2, Kalberla et al. 2005), with an excess column of 7.7 (+7.98/-6.22) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 1.30e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 81 seconds after the BAT trigger. No 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 18.5 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 large, but uncertain extinction expected.
We note that the Galactic latitude of this source is 2.6 deg, but we believe this to be a GRB based on the BAT and XRT lightcurves and the spectral information.
Burst Advocate for this burst is A. M. Parsons (parsons 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 Circular #8036
I. Bikmaev (KSU/AST), I. Khamitov (TUG), N. Sakhibullin (KSU/AST), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
report:
The field of GRB 080727C (GCN 8035, SWIFT trigger=318170) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at 28 July, 00:58 UT, i.e. ~2 hours after the burst, using Andor CCD.
We made 2*900 sec exposures in the R band and 900 sec exposure in the I band. We found no new source within XRT error circle. Using USNO-B1 stars we estimated frame limits as R~23.0 mag, I~21.5 mag.
GCN Circular #8038
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1905 s of XRT Photon Counting mode data and 1 UVOT images for GRB 080727C, 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 = 32.63485, +64.13754 which is equivalent to:
```
RA (J2000): 02h 10m 32.36s
Dec (J2000): +64d 08' 15.2"
```
with an uncertainty of 1.5 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 #8040
C. Guidorzi (INAF-OAB), S. Kobayashi, M.J. Burgdorf (Liverpool JMU) and N. Tanvir (U. Leicester) report on behalf of a larger collaboration:
On 2008 July 28 (01:35:55 UT) we began observing the field of GRB 080727C (Parsons et al. GCN Circ. 8035) with the Liverpool Telescope. Observations consisted of 6x300s exposures acquired using the SDSS-i' filter.
In our coadded frame we do not detect any source inside the refined XRT error box (Osborne et al. GCN Circ. 8038) down to the limiting magnitude reported below.
```
Telescope   Filter  T_mid[s]   Exposure[s]    M_lim (3-sigma)

-------------------------------------------------------------
Liverpool   SDSS-i'  9830        6x300         22.8
-------------------------------------------------------------
```
The calibration was performed using the I magnitudes of several USNOB-1 catalogue field objects. The value derived by us is consistent with that given by Bikmaev et al. (GCN Circ. 8036).
GCN Circular #8041
R.L.C. Starling (U. Leicester) and A.M. Parsons (GSFC) report on behalf of the Swift XRT team:
We have analysed the first five orbits of Swift XRT data for GRB 080727C (trigger=318170, Parsons et al. GCN Circ. 8035) beginning at T0+79 s until T0+22.6 ks. The enhanced XRT position is given in Osborne et al. (GCN Circ. 8038).
Up to approximately T0+110 s the light curve appears to be flat. Thereafter the light curve can be fitted with a broken power law with alpha1 = 1.5+/-0.1, breaking at Tbk = 740 +1880/-370 s to a slightly shallower decay of alpha2 = 1.2 +0.1/-0.3.
The Photon Counting mode spectrum consisting of 502 s of data during the first orbit is well fitted with an absorbed power law of photon index Gamma = 1.4+/-0.3 and intrinsic absorption (assuming z=0) of N_H = (1.2 +0.5/-0.2) e22 cm-2 in addition to the high Galactic absorption in this direction of N_H = 6.8e21 cm-2 (Kalberla et al. 2005). We measure an average observed (unabsorbed) 0.3-10 keV flux over this time of 1.1e-10 (1.7e-10) erg/cm2/s corresponding to an observed count rate to flux conversion of 1 count/s = 9.9e-11 erg/cm2/s.
The predicted count rate at T+24 hr is 0.001 count/s corresponding to an observed 0.3-10 keV flux of 1.35e-13 erg/cm2/s, assuming the decay continues with alpha=1.2.
This is an official product of the Swift-XRT team.
GCN Circular #8043
E. A. Hoversten (PSU) and A. M. Parsons (GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the field of GRB 080727C starting 82 seconds after the BAT trigger (Parsons, et al. GCN Circ. 8035). We do not detect any source in any of the filters at the UVOT-enhanced XRT position (Osborne, et al., GCN Circ. 8038). The 3-sigma upper limits at this position for single exposures are:
```
Filter  T_start    T_stop   Exp(s)  Mag (3-sigma upper limit)
-----------------------------------------------------
white      82.1     181.0    97.3     > 20.81
white    3987.1    4186.8   196.6     > 21.58
v         187.4     587.2   393.5     > 19.89
v        4397.7    4597.5   196.6     > 19.93
b         668.8     673.4     4.6     > 17.79
u         643.0     662.8    19.5     > 18.32
uvw1      618.4     638.2    19.5     > 18.11
uvm2      593.5     613.3    19.5     > 17.61
uvw2     4192.9    4392.7   196.6     > 20.17
```
The quoted upper limits have not been corrected for the expected Galactic extinction along the line of sight corresponding to a large reddening of E_{B-V} = 1.1 mag. All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #8044
E. Fenimore (LANL), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (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+843 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080727C (trigger #318170) (Parsons, et al., GCN Circ. 8035). The BAT ground-calculated position is RA, Dec = 32.638, 64.130 deg which is
```
   RA(J2000)  =  02h 10m 33.2s 
   Dec(J2000) = +64d 07' 48.6" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 77%.
The mask-weighted light curve shows several overlapping peaks starting at ~T-5 sec and ending at ~T+200 sec. T90 (15-350 keV) is 79.7 +- 8.8 sec (estimated error including systematics).
The time-averaged spectrum from T-3.3 to T+116.3 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.87 +- 0.20, and Epeak of 143.2 +- 50.0 keV (chi squared 66 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.2 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+15.23 sec in the 15-150 keV band is 2.3 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.30 +- 0.05 (chi squared 81 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/318170/BA/
GCN Circular #8047
Gendre, B. (LAM/CNRS), Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 080727 detected by SWIFT (trigger 318170) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 790.7s after the GRB trigger (765.8s after the notice). The elevation of the field increased from from 38 degrees above horizon and weather conditions were good.
The date of trigger : t0 = 2008-07-27T23:07:35.040
At the enhanced XRT position given by Osborne et al. (GCN #8038) we do not detect any optical transient.
We co-added a series of exposures: t0+857.5s to t0+1850.1s : R > 18.5
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=131.4275 lat= +2.5930 and the galactic extinction in R band is 2.8 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #8050
K. Yamaoka, S. Sugita (Aoyama Gakuin U.), M. Ohno, M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), Y.E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, N. Kodaka, K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori (Univ. of Miyazaki), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report:
The long 080727C (Swift/BAT trigger #318170; Parsons et al., GCN 8035) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 23:07:51.558 UT (=T0). The observed light curve shows two peaks, starting at T0-13s, ending at T0+70s, with a duration (T90) of about 54 seconds. The fluence in 150 - 1000 keV was (6.0 +/- 0.7) x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+9s was 0.78 +/- 0.12 photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-7s to T0+47s is fitted by a single power-law with a photon index of 1.83 +/- 0.18 in the 150 - 1000 keV range (chi^2/d.o.f = 6.1/11). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included.
The light curves with 1/64 sec time resolution for this burst are now available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html

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Jochen Greiner, last update: 01-Aug-2008 [Disclaimer]