Gamma-ray Burst 080604

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:28:20 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     313116,   Seg_Num: 0
GRB_RA:          236.970d {+15h 47m 53s} (J2000),
                 237.063d {+15h 48m 15s} (current),
                 236.417d {+15h 45m 40s} (1950)
GRB_DEC:         +20.555d {+20d 33' 19"} (J2000),
                 +20.530d {+20d 31' 47"} (current),
                 +20.708d {+20d 42' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2763 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        14621 TJD;   156 DOY;   08/06/04
GRB_TIME:        26821.15 SOD {07:27:01.15} UT
GRB_PHI:         -17.84 [deg]
GRB_THETA:        14.64 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.68 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +1  +0  +0 +69  +1 
SUN_POSTN:        72.70d {+04h 50m 48s}  +22.48d {+22d 29' 06"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.21d {+05h 20m 49s}  +27.47d {+27d 28' 13"}
MOON_DIST:       127.03 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.45, 49.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.68, 39.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 221.77,-15.82 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:29:39 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     313116,   Seg_Num: 0
GRB_RA:          236.9648d {+15h 47m 51.5s} (J2000),
                 237.0580d {+15h 48m 13.9s} (current),
                 236.4119d {+15h 45m 38.8s} (1950)
GRB_DEC:         +20.5572d {+20d 33' 25.9"} (J2000),
                 +20.5317d {+20d 31' 53.9"} (current),
                 +20.7101d {+20d 42' 36.3"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26940.44 SOD {07:29:00.44} UT,   119.3 [sec] since BAT Trigger Time
CENTROID_X:      285.50,  raw= 286  [pixels]
CENTROID_Y:      297.30,  raw= 297  [pixels]
ROLL:            339.54 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -1.64
GRB_POS_XRT_Z:   -39.58
IMAGE_URL:       sw00313116000msxps_rw.img
SUN_POSTN:        72.70d {+04h 50m 48s}  +22.49d {+22d 29' 06"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.22d {+05h 20m 53s}  +27.47d {+27d 28' 15"}
MOON_DIST:       127.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.45, 49.33 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.67, 39.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:29:29 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     313116,   Seg_Num: 0
GRB_RA:          236.9648d {+15h 47m 51.5s} (J2000),
                 237.0580d {+15h 48m 13.9s} (current),
                 236.4119d {+15h 45m 38.8s} (1950)
GRB_DEC:         +20.5572d {+20d 33' 25.9"} (J2000),
                 +20.5317d {+20d 31' 53.9"} (current),
                 +20.7101d {+20d 42' 36.3"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       8.93e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.00 [sigma]
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26940.44 SOD {07:29:00.44} UT,   119.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.24 261.37 243.62
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        72.70d {+04h 50m 48s}  +22.48d {+22d 29' 06"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.22d {+05h 20m 53s}  +27.47d {+27d 28' 14"}
MOON_DIST:       127.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.45, 49.33 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.67, 39.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.31 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:29:46 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     313116,   Seg_Num: 0
GRB_RA:          236.9648d {+15h 47m 51.5s} (J2000),
                 237.0580d {+15h 48m 13.9s} (current),
                 236.4119d {+15h 45m 38.8s} (1950)
GRB_DEC:         +20.5572d {+20d 33' 25.9"} (J2000),
                 +20.5317d {+20d 31' 53.9"} (current),
                 +20.7101d {+20d 42' 36.3"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26940.44 SOD {07:29:00.44} UT,   119.3 [sec] since BAT Trigger Time
CENTROID_X:      285.50,  raw= 286  [pixels]
CENTROID_Y:      297.30,  raw= 297  [pixels]
ROLL:            339.54 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -1.64
GRB_POS_XRT_Z:   -39.58
IMAGE_URL:       sw00313116000msxps_rw.img
SUN_POSTN:        72.70d {+04h 50m 48s}  +22.49d {+22d 29' 06"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.22d {+05h 20m 54s}  +27.47d {+27d 28' 15"}
MOON_DIST:       127.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.45, 49.33 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.67, 39.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:30:57 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     313116,   Seg_Num: 0
GRB_RA:          236.970d {+15h 47m 53s} (J2000),
                 237.063d {+15h 48m 15s} (current),
                 236.417d {+15h 45m 40s} (1950)
GRB_DEC:         +20.555d {+20d 33' 19"} (J2000),
                 +20.530d {+20d 31' 47"} (current),
                 +20.708d {+20d 42' 29"} (1950)
GRB_DATE:        14621 TJD;   156 DOY;   08/06/04
GRB_TIME:        26821.15 SOD {07:27:01.15} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -17.84 [deg]
GRB_THETA:        14.64 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.68 [sigma]
LC_URL:          sw00313116000msb.lc
SUN_POSTN:        72.70d {+04h 50m 48s}  +22.49d {+22d 29' 06"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.24d {+05h 20m 57s}  +27.47d {+27d 28' 16"}
MOON_DIST:       127.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.45, 49.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.68, 39.38 [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 an image 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 = 221.77,-15.82 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:31:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.969d {+15h 47m 53s} (J2000)
POINT_DEC:       +20.547d {+20d 32' 49"} (J2000)
POINT_ROLL:      339.539d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26948.90 SOD {07:29:08.90} UT,   127.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.156
N_STARS:         31
X_OFFSET:        552 [pixels]
Y_OFFSET:        568 [pixels]
X_MAX:           1511 [pixels]
Y_MAX:           1527 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0127.fits
SUN_POSTN:        72.70d {+04h 50m 48s}  +22.49d {+22d 29' 07"}
SUN_DIST:        134.37 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.24d {+05h 20m 58s}  +27.47d {+27d 28' 16"}
MOON_DIST:       127.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:31:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.969d {+15h 47m 53s} (J2000)
POINT_DEC:       +20.547d {+20d 32' 49"} (J2000)
POINT_ROLL:      339.539d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26948.90 SOD {07:29:08.90} UT,   127.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.156
N_STARS:         31
X_OFFSET:        552 [pixels]
Y_OFFSET:        568 [pixels]
X_MAX:           1511 [pixels]
Y_MAX:           1527 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0127.fits
SUN_POSTN:        72.70d {+04h 50m 49s}  +22.49d {+22d 29' 07"}
SUN_DIST:        134.37 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.25d {+05h 20m 60s}  +27.47d {+27d 28' 17"}
MOON_DIST:       127.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:32:46 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.969d {+15h 47m 53s} (J2000)
POINT_DEC:       +20.547d {+20d 32' 49"} (J2000)
ROLL:            339.539d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26948.90 SOD {07:29:08.90} UT,   127.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     234257351
X_OFFSET:        876 [pixels]
Y_OFFSET:        851 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       1011
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0127.fits
SUN_POSTN:        72.70d {+04h 50m 49s}  +22.49d {+22d 29' 07"}
SUN_DIST:        134.37 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.26d {+05h 21m 02s}  +27.47d {+27d 28' 18"}
MOON_DIST:       127.02 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:33:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.969d {+15h 47m 53s} (J2000)
POINT_DEC:       +20.547d {+20d 32' 49"} (J2000)
ROLL:            339.539d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26948.90 SOD {07:29:08.90} UT,   127.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     234257351
X_OFFSET:        876 [pixels]
Y_OFFSET:        851 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       1011
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0127.fits
SUN_POSTN:        72.70d {+04h 50m 49s}  +22.49d {+22d 29' 07"}
SUN_DIST:        134.37 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.27d {+05h 21m 04s}  +27.47d {+27d 28' 18"}
MOON_DIST:       127.01 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:37:19 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     313116,   Seg_Num: 0
GRB_RA:          236.9653d {+15h 47m 51.67s} (J2000),
                 237.0585d {+15h 48m 14.03s} (current),
                 236.4124d {+15h 45m 38.97s} (1950)
GRB_DEC:         +20.5578d {+20d 33' 28.0"} (J2000),
                 +20.5323d {+20d 31' 56.1"} (current),
                 +20.7107d {+20d 42' 38.5"} (1950)
GRB_ERROR:       0.4 [arcsec radius, statistical only]
GRB_MAG:         20.10 +/- 0.50 [mag]
FILTER:          10, White
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  26950.00 SOD {07:29:10.00} UT,   128.8 [sec] since BAT Trigger Time
SUN_POSTN:        72.71d {+04h 50m 49s}  +22.49d {+22d 29' 08"}
SUN_DIST:        134.35 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.31d {+05h 21m 15s}  +27.47d {+27d 28' 22"}
MOON_DIST:       126.98 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.46, 49.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.68, 39.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 2.5 arcsec from the XRT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:38:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
POINT_ROLL:      339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27054.75 SOD {07:30:54.75} UT,   233.6 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.187
N_STARS:         51
X_OFFSET:        556 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0233.fits
SUN_POSTN:        72.71d {+04h 50m 50s}  +22.49d {+22d 29' 08"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.32d {+05h 21m 17s}  +27.47d {+27d 28' 23"}
MOON_DIST:       126.99 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:38:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
POINT_ROLL:      339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27054.75 SOD {07:30:54.75} UT,   233.6 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.187
N_STARS:         51
X_OFFSET:        556 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0233.fits
SUN_POSTN:        72.71d {+04h 50m 50s}  +22.49d {+22d 29' 09"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.33d {+05h 21m 19s}  +27.47d {+27d 28' 23"}
MOON_DIST:       126.99 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:39:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
ROLL:            339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27054.75 SOD {07:30:54.75} UT,   233.6 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     234257457
X_OFFSET:        876 [pixels]
Y_OFFSET:        851 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       1011
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0233.fits
SUN_POSTN:        72.71d {+04h 50m 50s}  +22.49d {+22d 29' 09"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.34d {+05h 21m 20s}  +27.47d {+27d 28' 24"}
MOON_DIST:       126.98 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:39:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
ROLL:            339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27054.75 SOD {07:30:54.75} UT,   233.6 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     234257457
X_OFFSET:        876 [pixels]
Y_OFFSET:        851 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       1011
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0233.fits
SUN_POSTN:        72.71d {+04h 50m 50s}  +22.49d {+22d 29' 09"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.34d {+05h 21m 22s}  +27.47d {+27d 28' 24"}
MOON_DIST:       126.98 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:43:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
POINT_ROLL:      339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27688.20 SOD {07:41:28.20} UT,   867.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.238
N_STARS:         48
X_OFFSET:        556 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0867.fits
SUN_POSTN:        72.71d {+04h 50m 51s}  +22.49d {+22d 29' 10"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.39d {+05h 21m 33s}  +27.47d {+27d 28' 28"}
MOON_DIST:       126.96 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #7800
V. La Parola (INAF-IASFPA), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), N. P. M. Kuin (MSSL), J. Mao (INAF-OAB), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), D. Perez (U Leicester), B. Sbarufatti (INAF-IASFPA), R. L. C. Starling (U Leicester), D. E. Vanden Berk (PSU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 07:27:01 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080604 (trigger=313116). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 236.970, +20.555 which is
```
   RA(J2000) = 15h 47m 53s
   Dec(J2000) = +20d 33' 19"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a broad single peak structure with a duration of about 70 sec. The peak count rate was ~300 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 07:29:00.4 UT, 119.3 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 236.9648, +20.5572 which is equivalent to:
```
   RA(J2000)  = 15h 47m 51.5s
   Dec(J2000) = +20d 33' 25.9"
```
with an uncertainty of 5.4 arcseconds (radius, 90% containment). This location is 19 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 128 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	15:47:51.70 = 236.9654
  DEC(J2000) = +20:33:28.1  =  20.5578
```
with a 1-sigma error radius of about 0.5 arc sec. This position is 3.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 20.1 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is V. La Parola (laparola AT ifc.inaf.it). 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:     Wed 04 Jun 08 07:44:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
POINT_ROLL:      339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27688.20 SOD {07:41:28.20} UT,   867.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.238
N_STARS:         48
X_OFFSET:        556 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0867.fits
SUN_POSTN:        72.71d {+04h 50m 51s}  +22.49d {+22d 29' 10"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.39d {+05h 21m 34s}  +27.47d {+27d 28' 28"}
MOON_DIST:       126.96 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:44:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
ROLL:            339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27688.20 SOD {07:41:28.20} UT,   867.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     234258091
X_OFFSET:        875 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0867.fits
SUN_POSTN:        72.71d {+04h 50m 51s}  +22.49d {+22d 29' 10"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.40d {+05h 21m 37s}  +27.47d {+27d 28' 29"}
MOON_DIST:       126.95 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:45:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
ROLL:            339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27688.20 SOD {07:41:28.20} UT,   867.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     234258091
X_OFFSET:        875 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0867.fits
SUN_POSTN:        72.71d {+04h 50m 51s}  +22.49d {+22d 29' 10"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.41d {+05h 21m 38s}  +27.47d {+27d 28' 29"}
MOON_DIST:       126.95 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:45:20 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     313116,   Seg_Num: 0
GRB_RA:          236.9651d {+15h 47m 51.6s} (J2000),
                 237.0583d {+15h 48m 13.9s} (current),
                 236.4122d {+15h 45m 38.9s} (1950)
GRB_DEC:         +20.5582d {+20d 33' 29.5"} (J2000),
                 +20.5327d {+20d 31' 57.5"} (current),
                 +20.7111d {+20d 42' 39.9"} (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:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27206.00 SOD {07:33:26.00} UT,   384.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        72.71d {+04h 50m 51s}  +22.49d {+22d 29' 10"}
SUN_DIST:        134.35 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.41d {+05h 21m 38s}  +27.47d {+27d 28' 29"}
MOON_DIST:       126.94 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.46, 49.33 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.67, 39.38 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:50:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
POINT_ROLL:      339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27794.15 SOD {07:43:14.15} UT,   973.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.149
N_STARS:         63
X_OFFSET:        556 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0972.fits
SUN_POSTN:        72.72d {+04h 50m 52s}  +22.49d {+22d 29' 12"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.47d {+05h 21m 52s}  +27.48d {+27d 28' 34"}
MOON_DIST:       126.93 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Jun 08 07:50:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
POINT_ROLL:      339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27794.15 SOD {07:43:14.15} UT,   973.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.149
N_STARS:         63
X_OFFSET:        556 [pixels]
Y_OFFSET:        531 [pixels]
X_MAX:           1515 [pixels]
Y_MAX:           1490 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00313116000msufc0972.fits
SUN_POSTN:        72.72d {+04h 50m 52s}  +22.49d {+22d 29' 12"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.47d {+05h 21m 53s}  +27.48d {+27d 28' 34"}
MOON_DIST:       126.92 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:51:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
ROLL:            339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27794.15 SOD {07:43:14.15} UT,   973.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     234258196
X_OFFSET:        875 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0972.fits
SUN_POSTN:        72.72d {+04h 50m 52s}  +22.49d {+22d 29' 12"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.48d {+05h 21m 55s}  +27.48d {+27d 28' 35"}
MOON_DIST:       126.92 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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:     Wed 04 Jun 08 07:51:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     313116,   Seg_Num: 0
POINT_RA:        236.967d {+15h 47m 52s} (J2000)
POINT_DEC:       +20.546d {+20d 32' 45"} (J2000)
ROLL:            339.538d
IMG_START_DATE:  14621 TJD;   156 DOY;   08/06/04
IMG_START_TIME:  27794.15 SOD {07:43:14.15} UT,   973.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     234258196
X_OFFSET:        875 [pixels]
Y_OFFSET:        850 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1035
Y_GRB_POS:       1010
BINNING_INDEX:   1
IM_URL:          sw00313116000msuni0972.fits
SUN_POSTN:        72.72d {+04h 50m 52s}  +22.49d {+22d 29' 12"}
SUN_DIST:        134.36 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:       80.49d {+05h 21m 57s}  +27.48d {+27d 28' 35"}
MOON_DIST:       126.92 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       33.44, 49.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.68, 39.37 [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 #7801
E. Rol (U. Leicester), C. Guidorzi (INAF-OAB), A. Gomboc (U. Ljubljana), I.A. Steele (Liverpool JMU), P. O'Brien (U. Leicester), A, Melandri, D. Bersier, C.G. Mundell, R.J. Smith, D. Carter, S. Kobayashi, M. Burgdorf, M. Bode (Liverpool JMU), N. Bannister, N. Tanvir (U. Leicester) report:
The Faulkes Telescope North observed the position of GRB080604. We confirm the detection of an optical transient (La Parola, GCN 7800), with a position of (J2000):
```
RA =   15 47 51.65
Dec = +20 33 28.1
```
In the first 10 second exposure, starting 5:42 minutes after the BAT trigger, we estimate a magnitude of R = 20.12 +/- 0.15 with respect to the USNO-B1.0 star at 15:47:52.50, +20:34:24.4.
GCN Circular #7802
G. G. Williams (MMTO), P. A. Milne (Steward Observatory) and A. Updike (Clemson) on behalf of the Super-LOTIS Collaboration, report:
The robotic 0.6-m Super-LOTIS telescope began observing the error box of GRB 080604 (Swift Trigger 313116, La Parola et al. GCN 7800) at 07:28:59.0 UT, 118 seconds after the trigger. Our initial observations include 5 x 10s exposures, 5 x 20s exposures, and 30 x 60s exposures, all in the R-band.
We do not detect the afterglow reported by La Parola et al. (GCN 7800) and confirmed by Rol et al. (GCN 7801) in our earliest exposure to the following 5-sigma limiting magnitude determined using the nearby USNO-B1.0 star 1105-0256520 at RA=15:47:45.32, Dec=+20:33:38.4 with R2mag=14.56:
```
t_start (UT)	exp t (s)	t_start-t_0 (s)	Limit
--------------------------------------------------------
07:28:59.0	10 		118.0 		R > 17.5
```
We also do not detect the afterglow in our later images or the sum of our 20s images and 6x60s images. Additional observations and analysis are ongoing.
GCN Circular #7805
A. Cucchiara and D. B. Fox (Penn State) report:
"Starting on 2008 June 4.35 UT we used the Marcario LRS spectrograph on the Hobby-Eberly Telescope (R ~ 230) to obtain a 1200s spectrum of the optical afterglow of GRB 080604 (La Parola et al., GCN 7800). The spectrum covers the wavelength range 4500 to 10,000 Angstrom. Based on a preliminary calibration we detect absorption features corresponding to the MgII doublet (2796, 2803 A) and MgI (2852 A) as well as other metal absorption features at redshift z = 1.28.
The absence of Lyman break in our dataset suggests z < 2.7.
A refined analysis will be posted.
We thank the HET staff for performing this observation, in particular Matthew Shetrone."
GCN Circular #7807
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 749 s of overlapping XRT Photon Counting mode and UVOT data for GRB 080604, 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 = 236.96516, +20.55777 which is equivalent to:
```
RA (J2000): 15h 47m 51.64s
Dec (J2000): +20d 33' 28.0"
```
with an uncertainty of 1.7 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 #7816
V. La Parola, B. Sbarufatti, V. Mangano (INAF-IASF Pa) report on behalf of the Swift-XRT team
The Swift-XRT observed GRB 080604 (trigger 313116, La Parola et al. GCN Circ 7800) for 6.3 ksec, starting 119.3 seconds after the BAT trigger.
We detect an X-ray counterpart at the position (astrometrically corrected using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 236.96516, +20.55777 which is equivalent to:
```
RA (J2000): 15h 47m 51.64s
Dec (J2000): +20d 33' 28.0"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
The X-ray light curve shows a power law decay with slope -2.18 +/-0.06, with a hint of a flare at ~T+1000 s.
The spectrum accumulated over the whole observation can be modelled with an absorbed powerlaw with the following parameters (Galactic nH is 4.0e20cm**-2):
```
nH = (8 +/- 4)e20 cm**-2
Gamma= 1.8 +/- 0.2
Flux (0.3-10 keV) 4.18E-12 ergs cm**-2 s**-1
Unabsorbed Flux (0.3-10 keV) = 4.9E-12 ergs cm**-2 s**-1
```
The predicted XRT count rate after 24 hours from the burst is 1.5e-5 counts/s
This circular is an official product of the Swift-XRT team.
GCN Circular #7817
S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), V. La Parola (INAF-IASFPA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), 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 recent telemetry downlinks, we report further analysis of BAT GRB 080604 (trigger #313116) (La Parola, et al., GCN Circ. 7800). The BAT ground-calculated position is RA, Dec = 236.960, 20.557 deg, which is
```
   RA(J2000)  =  15h 47m 50.3s 
   Dec(J2000) = +20d 33' 25.4" 
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a single peak starting at ~T-25 sec and ending at ~T+100 sec. T90 (15-350 keV) is 82 +- 13 sec (estimated error including systematics).
The time-averaged spectrum from T-27.3 to T+67.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.18. The fluence in the 15-150 keV band is 8.0 +- 0.9 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-3.02 sec in the 15-150 keV band is 0.4 +- 0.1 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/313116/BA/
This burst satisfies Sakamoto/Ukwatta Swift-BAT possible high-z criteria (Ukwatta et al. arXiv:0802.3815):
```
1) Pawer Law photon index = 1.78 (PL photon index < 2)
2) 1-s peak photon flux   = 0.4 (1-s peak photon flux < 1.0 ph/cm2/s)
3) Light curve variance   = 1.1e-05 (Variance < 0.0001)
4) T90/(Peak photon flux) = 218 (T90/(Peak photon flux) > 100)
```
Based on a limited sample of bursts, these criteria yield an 85% chance it has a redshift greater than 3.5. We note that the Cucchiara (GCN Circ 7805) HET spectrum yields a z = 1.28.
GCN Circular #7818
K. Wiersema (U. of Leicester), J. Graham (STScI), N. Tanvir, E. Rol (U. of Leicester), A. Levan (U. of Warwick) and A. Fruchter (STScI) report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 080604 (GCNC 7800, 7801) with Gemini-North, using the GMOS-N instrument. Spectroscopy was performed with the R400 grism, using 4 x 450 seconds integration time, starting at 2008 June 04, 08:58 UT.
Several absorption lines of, among others, Fe II (2382,2586,2600), Mg II (2796,2803) and Mg I (2026,2852) are found at a redshift of 1.416. The discrepancy with respect to the redshift reported in GCN 7805 may be due to provisional calibration files used for the HET reduction (Cucchiara priv. comm.).
We thank the Gemini staff astronomers for their support in obtaining these observations.
GCN Circular #7819
A. Cucchiara and D. B. Fox (Penn State) report:
Based on updated calibration files we re-analyzed the GRB080604 spectrum taken at HET (GCN 7805). The features reported in the previous GCN are no longer significant at a 3-sigma confidence level. Furthermore, only an upper limit of z < 2.8 can be derived from our dataset.
Our revised results are consistent with the results from Gemini-North spectroscopy (Wiersama et al., GCN 7818). The low signal to noise of our spectrum does not permit detection of the absorption features associated with the z=1.416 system seen in those data.
GCN Circular #7820
M. De Pasquale (MSSL/UCL), V. La Parola (INAF-IASFPA), F. E. Marshall (GSFC) report: The Swift UltraViolet/Optical Telescope (UVOT) began its first finding chart exposure of GRB080604 (La Parola et al., GCN circ. 7800) 129 seconds after the trigger in white filter and detected the optical afterglow (GCN circ. 7800). The coordinates of this transient are:
```
  Dec:  15:47:51.68
  RA:  +20:33:28.0
```
The afterglow is detected only in the white filter. Magnitudes and 3 sigma upper limits are listed in the table below.
Filter T_start(s) T_stop(s) Exp(s) Magnitude
white 129 228 99 20.1 +/- 0.2
white 730 739 10 > 19.7
white 869 968 99 21.0 +0.3 -0.2
white 1479 1651 39 > 20.7
white 5369 7031 393 21.8 +0.5 -0.4
v 235 635 393 > 20.1
v 769 1373 412 > 20.0
v 1519 1701 39 > 18.8
v 5807 7441 393 > 19.9
v 17489 18395 885 > 20.3
b 716 725 10 > 19.0
b 1454 1637 39 > 19.8
b 5191 6826 393 > 21.0
u 691 862 39 > 19.4
u 1430 1612 39 > 19.4
u 4896 6621 393 > 20.7
u 12600 13306 689 > 21.0
uw1 667 1738 46 > 19.6
uw1 6217 12591 1082 > 21.2
um2 641 19090 1931 > 21.6
uw2 745 17482 1395 > 21.4
The values quoted above are on the UVOT Photometric System (Poole et al, 2008, MNRAS 383,627). They are not corrected for the expected Galactic reddening of E(B-V) = 0.049 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #7821
M. Yoshida, K. Yanagisawa, D. Kuroda, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 080604 (La Parola et al., GCN7800) with the 50cm MITSuME Telescope at Okayama Astrophysical Observatory on June 4 UT. We detected a faint point source at the UVOT position (La Parola et al., GCN7800; Rol et al., GCN7801; De Pasquale et al., GCN7820) in our Ic band image. Photometric calibration was done using USNO-B1.0 catalog.
```
      mid-UT        exp-T      g'      Rc           Ic
------------------------------------------------------------
2008-6-4 12:41:48   49min    >20.0    >19.2    18.6 +/- 0.4
------------------------------------------------------------
```
GCN Circular #7825
X.M. Meng, Y.N. Zhu, L.P. Xin, Q.C. Feng, M. Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, J. Wang, Y. Urata and W.K. Zheng on behalf of EAFON report:
We observed GRB080604 (La Parola et al., GCN 7800) with Xinglong 2.16m telescope + BFOSC on Jun 4, 8.024 hours after the burst. We marginally detected the OT (La Parola et al., GCN 7800; Rol et al., GCN 7801; De Pasquale et al., GCN 7820) at 3 sigma level. The estimated brightness was R ~ 21.6 +/- 0.3 calibrated to USNO-A2.0 stars. This message may be cited.
For more information about Xinglong GRBs Follow-up observations, please visit the website: http://www.xinglong-naoc.org/grb/
GCN Circular #7842
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB 080604 (GCN 7800) at a frequency of 8.46 GHz on 2008 June 05.22 UT. The GRB radio afterglow is undetected and the peak radio flux at the SWIFT-UVOT position (GCN 7800) is -8 =B1 39 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Report 140.1
GCN_Report 140.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_140_1.pdf by V. La Parola at INAF-IASFPa titled: "Final Swift Observations of GRB 080604"

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Jochen Greiner, last update: 16-Jun-2008 [Disclaimer]