Gamma-ray Burst 080319D

(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 19 Mar 08 17:14:53 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     306793,   Seg_Num: 0
GRB_RA:           99.480d {+06h 37m 55s} (J2000),
                  99.606d {+06h 38m 25s} (current),
                  98.718d {+06h 34m 52s} (1950)
GRB_DEC:         +23.933d {+23d 56' 01"} (J2000),
                 +23.926d {+23d 55' 33"} (current),
                 +23.978d {+23d 58' 39"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1597 [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:        14544 TJD;    79 DOY;   08/03/19
GRB_TIME:        61509.34 SOD {17:05:09.34} UT
GRB_PHI:         -141.43 [deg]
GRB_THETA:        33.93 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.22 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -3  +0  +1 +15  +1 
SUN_POSTN:       359.52d {+23h 58m 04s}   -0.21d {-00d 12' 32"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.76d {+10h 27m 02s}   +8.86d {+08d 51' 26"}
MOON_DIST:        56.47 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       98.66,  0.78 [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 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 = 13.73,1.57 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 17:15:21 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.486d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.935d {+23d 56' 05"} (J2000)
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61656.87 SOD {17:07:36.87} UT,   147.5 [sec] since BAT Trigger Time
COUNTS:          11    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:     Wed 19 Mar 08 17:16:28 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     306793,   Seg_Num: 0
GRB_RA:           99.480d {+06h 37m 55s} (J2000),
                  99.606d {+06h 38m 25s} (current),
                  98.718d {+06h 34m 52s} (1950)
GRB_DEC:         +23.933d {+23d 56' 01"} (J2000),
                 +23.926d {+23d 55' 33"} (current),
                 +23.978d {+23d 58' 39"} (1950)
GRB_DATE:        14544 TJD;    79 DOY;   08/03/19
GRB_TIME:        61509.34 SOD {17:05:09.34} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -141.43 [deg]
GRB_THETA:        33.93 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.22 [sigma]
LC_URL:          sw00306793000msb.lc
SUN_POSTN:       359.52d {+23h 58m 04s}   -0.21d {-00d 12' 31"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.77d {+10h 27m 05s}   +8.85d {+08d 51' 03"}
MOON_DIST:        56.49 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       98.66,  0.78 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is 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 = 13.73,1.57 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 17:16:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.486d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.934d {+23d 56' 04"} (J2000)
POINT_ROLL:      273.856d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61660.49 SOD {17:07:40.49} UT,   151.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.583
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0151.fits
SUN_POSTN:       359.52d {+23h 58m 04s}   -0.21d {-00d 12' 30"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.78d {+10h 27m 06s}   +8.85d {+08d 50' 56"}
MOON_DIST:        56.49 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.66,  0.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 17:17:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.486d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.934d {+23d 56' 04"} (J2000)
POINT_ROLL:      273.856d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61660.49 SOD {17:07:40.49} UT,   151.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.583
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0151.fits
SUN_POSTN:       359.52d {+23h 58m 05s}   -0.21d {-00d 12' 30"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.78d {+10h 27m 08s}   +8.85d {+08d 50' 46"}
MOON_DIST:        56.49 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.66,  0.78 [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 19 Mar 08 17:18:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.486d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.934d {+23d 56' 04"} (J2000)
ROLL:            273.856d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61660.49 SOD {17:07:40.49} UT,   151.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227639263
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0151.fits
SUN_POSTN:       359.52d {+23h 58m 05s}   -0.21d {-00d 12' 29"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.79d {+10h 27m 09s}   +8.84d {+08d 50' 34"}
MOON_DIST:        56.50 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.66,  0.78 [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 19 Mar 08 17:18:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.486d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.934d {+23d 56' 04"} (J2000)
ROLL:            273.856d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61660.49 SOD {17:07:40.49} UT,   151.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227639263
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0151.fits
SUN_POSTN:       359.52d {+23h 58m 05s}   -0.21d {-00d 12' 28"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.79d {+10h 27m 10s}   +8.84d {+08d 50' 28"}
MOON_DIST:        56.51 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.66,  0.78 [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 19 Mar 08 17:25:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
POINT_ROLL:      273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61766.51 SOD {17:09:26.51} UT,   257.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.636
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0257.fits
SUN_POSTN:       359.52d {+23h 58m 06s}   -0.21d {-00d 12' 22"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.84d {+10h 27m 22s}   +8.82d {+08d 48' 57"}
MOON_DIST:        56.56 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 17:25:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
POINT_ROLL:      273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61766.51 SOD {17:09:26.51} UT,   257.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.636
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0257.fits
SUN_POSTN:       359.52d {+23h 58m 06s}   -0.21d {-00d 12' 22"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.85d {+10h 27m 24s}   +8.81d {+08d 48' 47"}
MOON_DIST:        56.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:26:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
ROLL:            273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61766.51 SOD {17:09:26.51} UT,   257.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     227639369
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0257.fits
SUN_POSTN:       359.52d {+23h 58m 06s}   -0.21d {-00d 12' 21"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.85d {+10h 27m 25s}   +8.81d {+08d 48' 35"}
MOON_DIST:        56.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:26:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
ROLL:            273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  61766.51 SOD {17:09:26.51} UT,   257.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     227639369
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0257.fits
SUN_POSTN:       359.52d {+23h 58m 06s}   -0.21d {-00d 12' 21"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.86d {+10h 27m 26s}   +8.81d {+08d 48' 32"}
MOON_DIST:        56.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:27:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.489d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
POINT_ROLL:      273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62375.78 SOD {17:19:35.78} UT,   866.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.619
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0866.fits
SUN_POSTN:       359.53d {+23h 58m 06s}   -0.21d {-00d 12' 20"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.86d {+10h 27m 27s}   +8.81d {+08d 48' 19"}
MOON_DIST:        56.58 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 17:28:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.489d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
POINT_ROLL:      273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62375.78 SOD {17:19:35.78} UT,   866.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.619
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0866.fits
SUN_POSTN:       359.53d {+23h 58m 06s}   -0.21d {-00d 12' 19"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.87d {+10h 27m 28s}   +8.80d {+08d 48' 12"}
MOON_DIST:        56.59 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:29:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.489d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
ROLL:            273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62375.78 SOD {17:19:35.78} UT,   866.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227639978
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0866.fits
SUN_POSTN:       359.53d {+23h 58m 06s}   -0.21d {-00d 12' 18"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.88d {+10h 27m 30s}   +8.80d {+08d 47' 59"}
MOON_DIST:        56.59 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:29:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.489d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
ROLL:            273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62375.78 SOD {17:19:35.78} UT,   866.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     227639978
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0866.fits
SUN_POSTN:       359.53d {+23h 58m 06s}   -0.21d {-00d 12' 18"}
SUN_DIST:         99.30 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.88d {+10h 27m 31s}   +8.80d {+08d 47' 55"}
MOON_DIST:        56.60 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:32:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
POINT_ROLL:      273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62481.61 SOD {17:21:21.61} UT,   972.3 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.690
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0972.fits
SUN_POSTN:       359.53d {+23h 58m 07s}   -0.20d {-00d 12' 15"}
SUN_DIST:         99.29 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.90d {+10h 27m 36s}   +8.79d {+08d 47' 12"}
MOON_DIST:        56.62 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Mar 08 17:31:57 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     306793,   Seg_Num: 0
GRB_RA:           99.4723d {+06h 37m 53.3s} (J2000),
                  99.5976d {+06h 38m 23.4s} (current),
                  98.7096d {+06h 34m 50.2s} (1950)
GRB_DEC:         +23.9432d {+23d 56' 35.5"} (J2000),
                 +23.9356d {+23d 56' 08.2"} (current),
                 +23.9872d {+23d 59' 13.8"} (1950)
GRB_ERROR:       3.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62082.00 SOD {17:14:42.00} UT,   572.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       359.53d {+23h 58m 07s}   -0.20d {-00d 12' 16"}
SUN_DIST:         99.28 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.90d {+10h 27m 36s}   +8.79d {+08d 47' 18"}
MOON_DIST:        56.64 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.01,  7.87 [deg] galactic lon,lat of the burst
ECL_COORDS:       98.65,  0.79 [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:     Wed 19 Mar 08 17:32:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
POINT_ROLL:      273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62481.61 SOD {17:21:21.61} UT,   972.3 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        2.690
N_STARS:         190
X_OFFSET:        512 [pixels]
Y_OFFSET:        511 [pixels]
X_MAX:           1471 [pixels]
Y_MAX:           1470 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00306793000msufc0972.fits
SUN_POSTN:       359.53d {+23h 58m 07s}   -0.20d {-00d 12' 15"}
SUN_DIST:         99.29 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.91d {+10h 27m 37s}   +8.78d {+08d 47' 05"}
MOON_DIST:        56.63 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:33:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
ROLL:            273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62481.61 SOD {17:21:21.61} UT,   972.3 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     227640084
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0972.fits
SUN_POSTN:       359.53d {+23h 58m 07s}   -0.20d {-00d 12' 14"}
SUN_DIST:         99.29 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.91d {+10h 27m 39s}   +8.78d {+08d 46' 52"}
MOON_DIST:        56.64 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 19 Mar 08 17:34:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     306793,   Seg_Num: 0
POINT_RA:         99.488d {+06h 37m 57s} (J2000)
POINT_DEC:       +23.936d {+23d 56' 09"} (J2000)
ROLL:            273.859d
IMG_START_DATE:  14544 TJD;    79 DOY;   08/03/19
IMG_START_TIME:  62481.61 SOD {17:21:21.61} UT,   972.3 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     227640084
X_OFFSET:        831 [pixels]
Y_OFFSET:        830 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       991
Y_GRB_POS:       990
BINNING_INDEX:   1
IM_URL:          sw00306793000msuni0972.fits
SUN_POSTN:       359.53d {+23h 58m 07s}   -0.20d {-00d 12' 13"}
SUN_DIST:         99.29 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:      156.92d {+10h 27m 40s}   +8.78d {+08d 46' 45"}
MOON_DIST:        56.64 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      190.02,  7.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       98.67,  0.78 [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 #7453
P. J. Brown (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), O. Godet (U Leicester), S. T. Holland (CRESST/USRA/GSFC), S. Immler (CRESST/GSFC/UMD), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Perri (ASDC), J. L. Racusin (PSU), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), E. Troja (U Leicester/INAF-IASFPA) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 17:05:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080319D (trigger=306793). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 99.480, +23.933 which is
```
   RA(J2000) = 06h 37m 55s
   Dec(J2000) = +23d 56' 01"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the prompt light curve does not not show any clear structure. We will be able to tell more with the full data set.
The XRT began observing the field at 17:07:36.9 UT, 147.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued, variable X-ray source with an enhanced position: RA, Dec 99.47270, 23.94306 which is equivalent to:
```
   RA(J2000)  = 06h 37m 53.45s
   Dec(J2000) = +23d 56' 35.5"
```
with an uncertainty of 3.0 arcseconds (radius, 90% containment). This location is 44 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 2.17e+21 cm^-2 (Kalberla et al. 2005), so we cannot constrain the redshift at this time using the relation from Grupe et al. (2007). A summary of the promptly downlinked data is given at http://www.swift.ac.uk/sper/306793/.
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 152 seconds after the BAT trigger. A possible afterglow candidate has been found in the initial data products, at a magnitude of ~19 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.19. The position of the tentative UVOT source is:
```
   RA(J2000)  = 06h 37m 53.6s
   Dec(J2000) = +23d 56' 34.1"
```
Burst Advocate for this burst is P. J. Brown (pbrown AT astro.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #7454
MASTER-Net Team:
V. Lipunov, V.Kornilov, D.Kuvshinov, E.Gorbovskoy, N.Tyurina, A.Belinski, A.Krylov, N.Shatskiy, A.Sankovich, V.Vladimirov, P.Gritsyk, V.Vibornov, A.Kuznetsov, P.Balanutsa Sternberg Astronomical Institute, Moscow Union 'Optic'
A. Tlatov, I.Golubov Kislovodsk Solar Station of the Pulkovo observatory
K.Ivanov Irkutsk State University
I.Zalognikh Ural State University, Kourovka
MASTER Very Wide Field Camera located at Kislovodsk Solar Station (http://observ.pereplet.ru, D=70 mm, 420 square degrees, 11 Mpixel's CCD) has moved to the Swift-BAT trigger 306793 and it has taken a series of 5s exposures starting 92 s after notice arrivel time 708 s after GRB time at 17 16 57 UT under good weather condition and moon.
There is no OT was found inside Swift error box brighter than 11.5m.
MASTER-Net team congratulate "Pi of the Sky" - Team with wonderfull and long-awaited result (Cwiok et al. GCN 7445)!
This message can be cited. Mailto: lipunov@sai.msu.ru
GCN Circular #7455
Correction to GCN 7454!
MASTER-Net Team:
V. Lipunov, V.Kornilov, D.Kuvshinov, E.Gorbovskoy, N.Tyurina, A.Belinski, A.Krylov, N.Shatskiy, A.Sankovich, V.Vladimirov, P.Gritsyk, V.Vibornov, A.Kuznetsov, P.Balanutsa Sternberg Astronomical Institute, Moscow Union 'Optic'
A. Tlatov, I.Golubov Kislovodsk Solar Station of the Pulkovo observatory
K.Ivanov Irkutsk State University
I.Zalognikh Ural State University, Kourovka
MASTER Very Wide Field Camera located at Kislovodsk Solar Station (http://observ.pereplet.ru, D=70 mm, 420 square degrees, 11 Mpixel's CCD) has moved to the Swift-BAT trigger 306793 and it has taken a series of 5s exposures starting 92 s after notice arrivel time 708 s after GRB time at 17 16 57 UT under good weather condition and moon.
There is no OT was found inside Swift error box brighter than 11.5m.
MASTER-Net team congratulate "Pi of the Sky" - Team with wonderfull and long-awaited result (Cwiok et al. GCN 7445)!
This message can be cited. Mailto: lipunov@sai.msu.ru
GCN Circular #7458
S. Immler (CRESST/GSFC/UMD) and P. J. Brown (PSU) report on behalf of the Swift UVOT team:
The Swift/UVOT observations of the field of GRB 080319D (trigger 306793) starting 151 seconds after the BAT trigger (Brown, et al., GCN Circ. 7453) reveal a fading optical afterglow candidate. The white and v-filter magnitudes are as follows:
```
Filter        T_start (s)    T_stop (s)        Exp (s)    Mag (3-sigma UL)
----------------------------------------------------------------------------
White    151        251            100        19.7+/-0.3
White    866        966            100        20.2+/-0.4
v        257        657            400        >19.5
v        972        1362           400        >19.5
----------------------------------------------------------------------------
```
No correction has been made for the expected Galactic extinction corresponding to E(B-V) of 0.19 (Schlegel, et al. 1998). The position of the optical afterglow candidate is
```
RA (2000) = 06h 37m 53.6s
Dec (2000) = +23d 56' 34.2"
```
with an uncertainty of 0.5 arcsec, which is 2.2 arcsec offset from the XRT position (Brown, et al., GCN Circ. 7453).
GCN Circular #7490
Dirk Grupe and Peter Brown (PSU) report on behalf of the Swift-XRT team:
The Swift-XRT started observing GRB 080319D (trigger=3D306793, Brown et al. GCN 7453) at 17:07:37 UT, 148 seconds after the BAT trigger.
The astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is: RA, Dec = 99.47254, +23.94275 which is equivalent to:
```
RA (J2000):  06 37 53.41
Dec (J2000): +23 56 33.9
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
The 0.3-10 keV X-ray light curve starts with three flares up to 20 counts/s. The afterglow decays very fast and started to flatten at about 1000 s after the burst. The light curves shows another break at about 5 ks after the burst and is currently decaying with a decay slope of 1.3.
The spectrum of the PC data can be well fit by an absorbed single powerlaw with photon index 2.12 =B1 0.27 and column density of (3.8 =B1 1.4)e21 cm-2. This is in excess of the Galactic column density of 2.17e21 cm-2 in this direction. Using this spectrum we estimated a count rate to flux conversion of 1 count/s converts to 6.28e-11 ergs/cm2/s.
If the underlying powerlaw decay continues as is, we predict an XRT count rate of 1.6e-3 counts/s at T+24 hours and 6.5e-4 counts/s at T+48 hours after the burst, or 1.0e-13 ergs/s/cm2 and 4.1e-14 ergs/s/cm2, respectively.
This circular is an official product of the Swift-XRT team.
GCN Circular #7498
T. Ukwatta (GWU) S. D. Barthelmy (GSFC), P. J. Brown (PSU), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), 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 (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) (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 080319D (trigger #306793) (Brown, et al., GCN Circ. 7453). The BAT ground-calculated position is RA, Dec = 99.479, 23.982 deg which is
```
   RA(J2000)  =  06h 37m 55.0s
   Dec(J2000) = +23d 58' 56.0"
```
with an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 59%.
The mask-weighted light curve shows a roughly symmetric peak starting at ~T+0, peaking at ~T+23, and ending at ~T+50 sec. T90 (15-350 keV) is 24 +- 4 sec (estimated error including systematics).
The time-averaged spectrum from T+5.0 to T+34.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.92 +- 0.35. The fluence in the 15-150 keV band is 3.2 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+25.35 sec in the 15-150 keV band is 0.1 +- 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/306793/BA/
GCN Circular #7500
G. Greco (Bologna University), F. Terra (Second University of Roma "Tor Vergata"), C. Bartolini, A. Guarnieri, A. Piccioni (Bologna University), F. Munz, G. Pizzichini (INAF/IASF Bologna), D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"), A. Shearer (Centre for Astronomy, Galway), R. Gualandi (Bologna Observatory) report:
We observed the field of GRB 080319D (Brown et al., GCN 7453) with the 152 cm telescope located in Loiano, under unfavourable conditions due to full moon light.
One Rc-band observation (1x600 sec) was done on 2008 March at 20.779 UT middle exposure time.
We do not detect any object at the position of the candidate afterglow reported by Immler et al. (GCN 7458). Our 3-sigma limiting magnitude is R~20 (based on the Nomad1 catalogue).
The image has been posted in our public directory from where it can be retrieved by sftp using
```
hostname: ermione.bo.astro.it
username: publicGRB
password: GRB_bo.
directory: GRB080319D
```
GCN Circular #7503
C. Clemens, S. Klose (Tautenburg Obs.), J. Greiner, A. Kupcu Yoldas, A. Yoldas, T. Kruehler and G. Szokoly (Eoetvoes Univ., Budapest and MPE Garching) (all others MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 080319D (SWIFT trigger 306793; P. J. Brown et al., GCN 7453) simultaneously in g', r', i', z', J, H and K with GROND (Greiner et al. 2008, PASP) mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile).
Observations started at 00:15 UT on March 20th, 2008, about 7.2 hrs after the GRB trigger at an airmass of 1.7 to 2.5. We obtained 0.5 hrs of total integration time in g', r', i' and z' and found a source, which might be the host galaxy, also present in the DSS2 red images at
```
RA (J2000.0) = 06h 37m 53.56s
DEC (J2000.0) = 23d 56' 34.2''
```
within the 0.5'' Swift UVOT error circle reported by S. Immler et al. in GCN 7458. The object is seen in all bands except K, implying a redshift smaller than 3.5.
Our co-added images reveal roughly estimated magnitudes of g' = 21.3, r' = 20.7, i' = 19.9 and z' = 19.7, calibrated against USNO-B catalogue stars.
No statement about variability, i.e. an additional contribution from afterglow light, can be made at this point. Further observations are planned.
GCN Circular #7514
C. Clemens, S. Klose (Tautenburg Obs.), J. Greiner, A. Kupcu Yoldas, A. Yoldas, T. Kruehler and G. Szokoly (Eoetvoes Univ., Budapest and MPE Garching) (all others MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 080319D for a second time at 23:43 UT on March 23rd, 2008, about 4.3 days after the GRB trigger with 0.5 hrs of total integration time in g', r', i' and z'.
We do not detect any object within the Swift UVOT error circle (S. Immler et al., GCN #7458) to the following 3-sigma upper limits:
g' > 24.7, r' > 23.4, i' > 22.7 and z' > 22.5.
This indicates a clear fading of the optical afterglow compared to our first epoch observations (C. Clemens et al., GCN #7503).

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Jochen Greiner, last update: 25-Mar-2008 [Disclaimer]