Gamma-ray Burst 080603B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:38:29 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     313087,   Seg_Num: 0
GRB_RA:          176.528d {+11h 46m 07s} (J2000),
                 176.642d {+11h 46m 34s} (current),
                 175.841d {+11h 43m 22s} (1950)
GRB_DEC:         +68.076d {+68d 04' 33"} (J2000),
                 +68.029d {+68d 01' 45"} (current),
                 +68.354d {+68d 21' 13"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2821 [cnts]    Image_Peak=213 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   121     E_range: 25-100 keV
BKG_INTEN:       30306 [cnts]
BKG_TIME:        70677.16 SOD {19:37:57.16} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14620 TJD;   155 DOY;   08/06/03
GRB_TIME:        70693.28 SOD {19:38:13.28} UT
GRB_PHI:          -6.62 [deg]
GRB_THETA:        17.22 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.36 [sigma]
IMAGE_SIGNIF:    10.63 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2 +20  +0  +0 -26  +1 
SUN_POSTN:        72.19d {+04h 48m 46s}  +22.43d {+22d 25' 42"}
SUN_DIST:         74.48 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.79d {+04h 47m 09s}  +27.03d {+27d 01' 35"}
MOON_DIST:        70.37 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.94, 47.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      133.72, 57.37 [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 = 267.39,1.88 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:40:03 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     313087,   Seg_Num: 0
GRB_RA:          176.5323d {+11h 46m 07.7s} (J2000),
                 176.6471d {+11h 46m 35.3s} (current),
                 175.8455d {+11h 43m 22.9s} (1950)
GRB_DEC:         +68.0598d {+68d 03' 35.2"} (J2000),
                 +68.0130d {+68d 00' 46.7"} (current),
                 +68.3376d {+68d 20' 15.3"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       235 [cnts]
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70755.05 SOD {19:39:15.05} UT,   61.8 [sec] since BAT Trigger Time
CENTROID_X:      330.27,  raw= 330  [pixels]
CENTROID_Y:      324.89,  raw= 325  [pixels]
ROLL:            291.60 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   63.41
GRB_POS_XRT_Z:   65.94
IMAGE_URL:       sw00313087000msxps_rw.img
SUN_POSTN:        72.19d {+04h 48m 46s}  +22.43d {+22d 25' 42"}
SUN_DIST:         74.49 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.81d {+04h 47m 14s}  +27.03d {+27d 01' 41"}
MOON_DIST:        70.37 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.91 [deg] galactic lon,lat of the burst
ECL_COORDS:      133.74, 57.36 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:39:48 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     313087,   Seg_Num: 0
GRB_RA:          176.5323d {+11h 46m 07.7s} (J2000),
                 176.6471d {+11h 46m 35.3s} (current),
                 175.8455d {+11h 43m 22.9s} (1950)
GRB_DEC:         +68.0598d {+68d 03' 35.2"} (J2000),
                 +68.0130d {+68d 00' 46.7"} (current),
                 +68.3376d {+68d 20' 15.3"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.21e-08 [erg/cm2/sec]
GRB_SIGNIF:      15.32 [sigma]
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70755.05 SOD {19:39:15.05} UT,   61.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.62 237.23 261.32 243.28
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        72.19d {+04h 48m 46s}  +22.43d {+22d 25' 42"}
SUN_DIST:         74.49 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.80d {+04h 47m 13s}  +27.03d {+27d 01' 40"}
MOON_DIST:        70.37 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.91 [deg] galactic lon,lat of the burst
ECL_COORDS:      133.74, 57.36 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.97 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:39:55 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     313087,   Seg_Num: 0
GRB_RA:          176.5323d {+11h 46m 07.7s} (J2000),
                 176.6471d {+11h 46m 35.3s} (current),
                 175.8455d {+11h 43m 22.9s} (1950)
GRB_DEC:         +68.0598d {+68d 03' 35.2"} (J2000),
                 +68.0130d {+68d 00' 46.7"} (current),
                 +68.3376d {+68d 20' 15.3"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       235 [cnts]
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70755.05 SOD {19:39:15.05} UT,   61.8 [sec] since BAT Trigger Time
CENTROID_X:      330.27,  raw= 330  [pixels]
CENTROID_Y:      324.89,  raw= 325  [pixels]
ROLL:            291.60 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   63.41
GRB_POS_XRT_Z:   65.94
IMAGE_URL:       sw00313087000msxps_rw.img
SUN_POSTN:        72.19d {+04h 48m 46s}  +22.43d {+22d 25' 42"}
SUN_DIST:         74.49 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.81d {+04h 47m 13s}  +27.03d {+27d 01' 40"}
MOON_DIST:        70.37 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.91 [deg] galactic lon,lat of the burst
ECL_COORDS:      133.74, 57.36 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:41:40 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     313087,   Seg_Num: 0
GRB_RA:          176.528d {+11h 46m 07s} (J2000),
                 176.642d {+11h 46m 34s} (current),
                 175.841d {+11h 43m 22s} (1950)
GRB_DEC:         +68.076d {+68d 04' 33"} (J2000),
                 +68.029d {+68d 01' 45"} (current),
                 +68.354d {+68d 21' 13"} (1950)
GRB_DATE:        14620 TJD;   155 DOY;   08/06/03
GRB_TIME:        70693.28 SOD {19:38:13.28} UT
TRIGGER_INDEX:   121
GRB_PHI:          -6.62 [deg]
GRB_THETA:        17.22 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.36 [sigma]
IMAGE_SIGNIF:    10.63 [sigma]
LC_URL:          sw00313087000msb.lc
SUN_POSTN:        72.19d {+04h 48m 47s}  +22.43d {+22d 25' 43"}
SUN_DIST:         74.48 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.83d {+04h 47m 18s}  +27.03d {+27d 01' 46"}
MOON_DIST:        70.35 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.94, 47.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      133.72, 57.37 [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 = 267.39,1.88 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:43:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.503d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.082d {+68d 04' 56"} (J2000)
POINT_ROLL:      291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70764.57 SOD {19:39:24.57} UT,   71.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.841
N_STARS:         10
X_OFFSET:        400 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1359 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00313087000msufc0071.fits
SUN_POSTN:        72.20d {+04h 48m 47s}  +22.43d {+22d 25' 43"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.85d {+04h 47m 24s}  +27.03d {+27d 01' 53"}
MOON_DIST:        70.33 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:44:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.503d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.082d {+68d 04' 56"} (J2000)
POINT_ROLL:      291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70764.57 SOD {19:39:24.57} UT,   71.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.841
N_STARS:         10
X_OFFSET:        400 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1359 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw00313087000msufc0071.fits
SUN_POSTN:        72.20d {+04h 48m 47s}  +22.43d {+22d 25' 44"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.86d {+04h 47m 26s}  +27.03d {+27d 01' 56"}
MOON_DIST:        70.33 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [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:     Tue 03 Jun 08 19:45:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.503d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.082d {+68d 04' 56"} (J2000)
ROLL:            291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70764.57 SOD {19:39:24.57} UT,   71.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     234214767
X_OFFSET:        626 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00313087000msuni0071.fits
SUN_POSTN:        72.20d {+04h 48m 47s}  +22.43d {+22d 25' 44"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.87d {+04h 47m 28s}  +27.03d {+27d 01' 59"}
MOON_DIST:        70.33 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [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:     Tue 03 Jun 08 19:45:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.503d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.082d {+68d 04' 56"} (J2000)
ROLL:            291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70764.57 SOD {19:39:24.57} UT,   71.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     234214767
X_OFFSET:        626 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00313087000msuni0071.fits
SUN_POSTN:        72.20d {+04h 48m 47s}  +22.43d {+22d 25' 44"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.87d {+04h 47m 29s}  +27.03d {+27d 01' 60"}
MOON_DIST:        70.32 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.88 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [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:     Tue 03 Jun 08 19:48:33 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.502d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.081d {+68d 04' 52"} (J2000)
POINT_ROLL:      291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70870.67 SOD {19:41:10.67} UT,   177.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        3.288
N_STARS:         13
X_OFFSET:        306 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1265 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00313087000msufc0177.fits
SUN_POSTN:        72.20d {+04h 48m 48s}  +22.43d {+22d 25' 45"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.91d {+04h 47m 38s}  +27.04d {+27d 02' 10"}
MOON_DIST:        70.31 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:49:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.502d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.081d {+68d 04' 52"} (J2000)
POINT_ROLL:      291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70870.67 SOD {19:41:10.67} UT,   177.4 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        3.288
N_STARS:         13
X_OFFSET:        306 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1265 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00313087000msufc0177.fits
SUN_POSTN:        72.20d {+04h 48m 48s}  +22.43d {+22d 25' 45"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.91d {+04h 47m 39s}  +27.04d {+27d 02' 12"}
MOON_DIST:        70.31 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [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:     Tue 03 Jun 08 19:48:46 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     313087,   Seg_Num: 0
GRB_RA:          176.5321d {+11h 46m 07.70s} (J2000),
                 176.6469d {+11h 46m 35.26s} (current),
                 175.8453d {+11h 43m 22.88s} (1950)
GRB_DEC:         +68.0610d {+68d 03' 39.6"} (J2000),
                 +68.0142d {+68d 00' 51.0"} (current),
                 +68.3388d {+68d 20' 19.6"} (1950)
GRB_ERROR:       0.4 [arcsec radius, statistical only]
GRB_MAG:         16.29 +/- 0.50 [mag]
FILTER:          10, White
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70766.00 SOD {19:39:26.00} UT,   72.7 [sec] since BAT Trigger Time
SUN_POSTN:        72.20d {+04h 48m 48s}  +22.43d {+22d 25' 45"}
SUN_DIST:         74.49 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.91d {+04h 47m 38s}  +27.04d {+27d 02' 11"}
MOON_DIST:        70.33 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      133.74, 57.36 [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 4.3 arcsec from the XRT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 03 Jun 08 19:49:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.502d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.081d {+68d 04' 52"} (J2000)
ROLL:            291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70870.67 SOD {19:41:10.67} UT,   177.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     234214873
X_OFFSET:        626 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00313087000msuni0177.fits
SUN_POSTN:        72.20d {+04h 48m 48s}  +22.43d {+22d 25' 45"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.92d {+04h 47m 42s}  +27.04d {+27d 02' 15"}
MOON_DIST:        70.30 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [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:     Tue 03 Jun 08 19:50:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     313087,   Seg_Num: 0
POINT_RA:        176.502d {+11h 46m 01s} (J2000)
POINT_DEC:       +68.081d {+68d 04' 52"} (J2000)
ROLL:            291.597d
IMG_START_DATE:  14620 TJD;   155 DOY;   08/06/03
IMG_START_TIME:  70870.67 SOD {19:41:10.67} UT,   177.4 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     234214873
X_OFFSET:        626 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00313087000msuni0177.fits
SUN_POSTN:        72.20d {+04h 48m 48s}  +22.43d {+22d 25' 45"}
SUN_DIST:         74.47 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:       71.93d {+04h 47m 43s}  +27.04d {+27d 02' 16"}
MOON_DIST:        70.30 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      131.95, 47.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      133.70, 57.36 [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 Circular #7792
W. Rujopakarn (Steward), T. Guver (U Arizona), D.A. Smith (Guilford), report on behalf of the ROTSE collaboration:
ROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe, Turkey, responded to GRB 080603 (Swift trigger 313087). The first image was at 19:38:36.2 UT, 22.9 s after the burst (8.3 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a new, rapidly fading object, not visible in the DSS (second epoch), with coordinates:
11:46:07.8 +68:03:39.9 (J2000), with positional uncertainty of 1" or better
```
start UT        mag     mlim(of image)
----------------------------------
19:38:36.2     14.1     14.9
```
A jpeg image is available at http://www.rotse.net/images/gsb313087_3d00_img.jpg (OT circled in yellow and blue)
GCN Circular #7794
V. Mangano (INAF-IASFPA), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), P. J. Brown (PSU), G. Cusumano (INAF-IASFPA), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (MSSL), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), K. M. McLean (GSFC/UMD), P. T. O'Brien (U Leicester), C. Pagani (PSU), D. M. Palmer (LANL), A. M. Parsons (GSFC), J. L. Racusin (PSU), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU), T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:
At 19:38:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080603B (trigger=313087). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 176.528, +68.076 which is
```
   RA(J2000)  =  11h 46m 07s
   Dec(J2000) = +68d 04' 33"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows three main peaks with a duration of about 70 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 19:39:55 UT. XRT found a bright, uncatalogued X-ray source located at:
```
   RA(J2000)  = 11h 46m 07.7s
   Dec(J2000) = +68d 03' 35.2"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment).
UVOT took a finding chart exposure of nominal 100 seconds with the White (160-650 nm) filter starting 72 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at RA(J2000) = 11:46:07.70 = 176.5321 DEC(J2000) = +68:03:40.0 = 68.0611 with a 1-sigma error radius of about 0.5 arc sec. This position is 4.9 arc sec. from the center of the XRT error circle. The estimated magnitude is 15.9 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 0.01.
Burst Advocate for this burst is V. Mangano (vanessa 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 Circular #7795
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 080603 detected by SWIFT (trigger 313087) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 62 min after the GRB trigger (burst occured at the sunset). The elevation of the field decreased from from 63 degrees above horizon and weather conditions were good.
We detected the candidate couterpart mentioned by Rujopakarn et al. (GCNC 7792). We note that the afterglow stays at about the same magnitude between 68 to 109 minutes. Magnitudes derived from two R filtered images are:
```
t0+68 min  to t0+ 71 min R=17.4
t0+106 min to t0+109 min R=17.5
```
The afterglow seems to exhibit a plateau phase in its optical light curve. We continue the follow-up.
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular #7796
A. J. Castro-Tirado, M. Jelinek, J. Gorosabel (IAA-CSIC Granada), P. Kub=E1nek (GACE, U. Valencia), S. Vitek (CVUT Praha), A. de Ugarte Postig= o (ESO Santiago), R. Cunniffe (Cork Univ.), R. Fern=E1ndez-Mu=F1oz (EELM-CS= IC La Mayora), P. Mart=EDn-Almendros (Fundaci=F3n M=E1laga) and L. Sabau-Gra= ziati (INTA Madrid), report:
"We are observing the field of GRB 080603B (Mangano et al. GCN 7794) with the recently installed 60cm robotic telescope BOOTES-2/TELMA in M=E1laga (south Spain). The first observations (120s each, with the r'-band filter) were obtained starting at 20:31 UT (i.e. 51 min after the onset of the event). We detect the optical afterglow (Rujopakarn et al. GCN 7792, Mangano et al.) with 17.3 mag, based on a preliminary calibration using USNO-A2.0. We also confirm the early plateau phase reported by Klotz et al.(GCNC 7795). From our last frame taken at 22:30 UT we derive a 0.3 mag decay. Further images (in g'r'i'Z filters) are on their way. Spectroscopic observations are encouraged."
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GCN Circular #7797
Johan Fynbo (DARK/NBI), Pierre-Olivier Quirion (Univ. Aarhus), Daniele Malesani, C. C. Thoene, J. Hjorth, B. Milvang-Jensen (DARK/NBI), and Pall Jakobsson (Univ. Hertfordshire) report on behalf of a larger collaboration:
We observed the field of GRB 080603B (Mangano et al., GCN 7794) with the NOT telescope. We obtained R-band imaging and a low resolution spectrum using the AlFOSC instrument. Based on the detection of Lyman-alpha and a number of relatively strong metal lines we infer a redshift of 2.69.
GCN Circular #7799
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 080603B from 68 min to 240 min after the trigger with TAROT. The light curve displays a slow optical decay compatible with alpha=0.62 +/- 0.1. R~18.2 at t0+225 min.
GCN Circular #7803
R. Zhuchkov, I.Bikmaev, N. Sakhibullin (KSU/AST), I. Khamitov, Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
report:
The optical counterpart (GCN7792, 7793, 7794, 7795, 7796, 7797, 7799) of GRB 080603B (GCN 7794, SWIFT trigger=313087) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at 03 June, 20:55 UT, i.e. ~1.3 hours after the burst, using Andor CCD.
A series of 70 frames with 60sec exposure in the R and V bands were taken for a time span ~ 4.5 hours. The afterglow is clearly detected in all images. Using RTT150 preliminary calibrated magnitudes for USNO-A2 1575-03195804 star R.A. = 11 46 09.53, Dec. = +68 01 51.3, V=14.2, R=13.8 mag, the brightness of the OT was estimated on each frame.
V,R light curves are shown at: http://www.tug.tubitak.gov.tr/~irekk/grb/grb080603B/GRB080603B_lc.jpg
Higher dispersion at (T-T0) > 4 hours must be due to high airmass ( Z ~ 65-70 degrees).
The VR-light curves are well fitted with two power law decay functions with a break about 3 hours after the burst.
A power law decay indices were estimated in OT VR-light curves as follow:
```
before the break
alpha_R=-0.59+/-0.03
alpha_V=-0.60+/-0.03

after the break
alpha_R=-1.14+/-0.09
alpha_V=-1.03+/-0.07
```
The alpha indices before the break are in good agreement with Klotz et al. (GCN7799) calculated for the time span between 1 and 4 hours after the burst.
GCN Circular #7806
J. Tueller (GSFC), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), V. Mangano (INAF-IASFPA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+470 sec from recent telemetry downlinks, we report further analysis of BAT GRB 080603B (trigger #313087) (Mongano, et al., GCN Circ. 7794). The BAT ground-calculated position is RA, Dec = 176.554, 68.061 deg, which is pre> RA(J2000) = 11h 46m 13.0s Dec(J2000) = +68d 03' 40.5" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows three main clusters of peaks. The first starts at T-1 sec, peaks at T+1 sec, and ends at ~T+7 sec. The second starts at T+8 sec and ends at T+20 sec. The third starts at ~T+42 sec and ends at ~T+80 sec. T90 (15-350 keV) is 60 +- 4 sec (estimated error including systematics).
The time-averaged spectrum from T-0.1 to T+68.6 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.21 +- 0.30, and Epeak of 71.0 +- 16.0 keV (chi squared 63.16 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 2.4 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+0.96 sec in the 15-150 keV band is 3.5 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.78 +- 0.07 (chi squared 75.18 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/313087/BA/
GCN Circular #7808
N. P. M. Kuin (MSSL/UCL), and V. Mangano (INAF-IASFPA), report on behalf of the Swift UVOT team
The Swift UltraViolet/Optical Telescope (UVOT) began observations of GRB 080603A, on June 3, 2008, at 19:39:07 UT, 63 seconds after the initial Swift BAT trigger (Mangano et al., GCN Circ. 7794)..
The refined uvot position is
```
 RA  = 11:46:07.66 = 176.5316
 DEC =+68:03:39.99 = 68.061105
```
with an error or 0.3".
The first finding chart in the wh filter has problems due to the brightness of the image, and needs detailed analysis. We start our report with the second finding chart.
The magnitudes with 1-sigma errors for GRB080603B are given below for the initial observation sequence.
```
Filter Tstart(s) Tstop(s) Exp(s) Magnitude

v       187.8      393.1    202    16.48 +/- 0.06
uvm2   5778.0     5977.8    197    > 19.51 (3-sigma UL)
uvw1   5983.9     6183.7    197    20.02 +/- 0.56
u      6188.8     6388.6    197    18.80 +/- 0.23
b      6395.3    12274.3    643    19.34 +/- 0.14
```
The absence of a detection in the uvm2 filter is consitent with the reported redshift of 2.69 (Fynbo et al., GCN Circ. 7797).
Magnitude variation in the b observations shor evidence of flaring or rebrightening..
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) = 0.013 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #7811
V. Mangano, V. La Parola, B. Sbarufatti (INAF-IASF PA) report on behalf of the Swift-XRT team:
The Swift-XRT observed GRB 080603B (trigger 313087, Mangano et al. GCN Circ 7794) for three orbits which consisted of 200 s of Windowed Timing mode data starting 68 s after the trigger and 990 s of Photon Counting mode data, 274 s after the trigger.
We obtained a refined XRT position at RA, Dec =3D 176.53312 68.06058 which is equivalent to:
```
RA (J2000):  11 46 07.95
Dec (J2000): 68 03 38.11
```
with an uncertainty of 3.7 arcsec (radius, 90% confidence). The position is 3.2 arcsec from the on-board position reported in GCN Circ. 7794 and 0.7 arcsec from the refined UVOT position (Kuin et al. GCN Circ 7808).
The X-ray light curve shows an initial steep decay with a slope of 3.4 =B1 0.1, breaking to a shallower decay of 0.8 =B1 0.1 at a time of 161 =B1 6 s after the trigger.
A spectrum of the Windowed Timing data can be well fit by an absorbed power-law, with a photon index Gamma =3D 1.68 =B1 0.06 and a column density Nh =3D (7.9 =B1 0.2) e21 cm-2 in excess with respect to the Galactic column density in this direction of 1.2e20 cm-2. The observed (unabsorbed) 0.3-10 keV flux is 7.0e-10 (7.7e-10) erg cm-2 s-1.
The Photon Counting mode spectrum is also well fit by an absorbed powerlaw, with an Nh =3D (1.3 =B1 0.2) e22 cm-2 and Gamma =3D 2.0 =B1 0.2. The observed (unabsorbed) 0.3-10 keV flux is 1.55 e-11 (1.91e-11) erg cm-2 s-1.
The predicted XRT count rate after 24 hours from burst is 6.0e-2 counts/s
This circular is an official product of the Swift-XRT team.
GCN Circular #7812
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report:
The long GRB 080603B (Swift-BAT trigger #313087: Mangano et al., GCN 7794, Tueller et al., GCN 7806) triggered Konus-Wind at T0=70692.383 s UT (19:38:12.383).
The burst light curve shows several pulses with a total duration of ~70s.
As observed by Konus-Wind the burst had a fluence of 4.50(-0.90, +1.53)x10^-6 erg/cm2, and a 256-ms peak flux measured from T0+0.624 s of 1.51(-0.38, +0.40)x10^-6 erg/cm2/s (both in the 20 keV - 1 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+73.984 s) can be fitted (in the 20-500 keV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.23(-0.54, +0.75), and Ep = 102(-28, +119) keV (chi2 = 50.5/42 dof). Fitting by GRBM (Band) model yields: the low-energy photon index is alpha = -0.94(-0.75, +1.21), the high energy photon index beta < -1.96, the peak energy Ep = 85(-30, +91) keV (chi2 = 49.7/41 dof).
The spectrum of the most intense part (from T0 T0+16.640 s) is well fitted (in the 20 keV - 1 MeV range) by a power law with exponential cutoff model with alpha = -1.20(-0.32, +0.26) and Ep = 200(-56, +131) keV (chi2 = 63.5/56 dof). The fluence of this part is 3.51(-0.58, +0.69)x10^-6 erg/cm2.
All the quoted errors are at the 90% confidence level.
Assuming z = 2.69 (Fynbo et al., GCN 7797) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, Omega_\Lambda = 0.73, the isotropic energy release is E_iso ~7.7x10^52 erg, the maximum luminosity is (L_iso)_max ~9.4x10^52 erg/s, and Ep_rest ~350 keV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080603_T70692/
GCN Circular #7813
A. Melandri, (Liverpool JMU), A. Gomboc (U. Ljubljana), C. Guidorzi (INAF-OAB), R.J. Smith, I.A. Steele, D. Bersier, C.G. Mundell, D. Carter, S. Kobayashi, M. Burgdorf, M. Bode (Liverpool JMU), E. Rol, P. O'Brien, N. Bannister, N. Tanvir (U. Leicester) report:
On 2008 Jun 03 at 21:32:57UT we observed the Swift GRB 080603B (trigger=313087, Mangano et al., GCN 7794) with the Liverpool Telescope using SDSS-I, SDDS-R and Bessell-B filters.
The OT reported by Rujopakarn et al. (GCN 7792), Mangano et al. (GCN 7794), Klotz et al. (GCN 7795, 7799), Castro-Tirado et al. (GCN 7796) and Zhuchkov et al.(GCN 7803) is well detected in all our single 300s exposures.
We calibrated the afterglow magnitude using B, R and I magnitudes of few USNO B1 stars in the field of view.
Our observations started soon after the plateau phase reported by Klotz et al. (GCN 7795) and Castro-Tirado et al. (GCN 7796) but our I-band and R-band images were acquired before and after the optical break reported by Zhuchkov et al.(GCN 7803).
We found alpha_I= 0.55 +/- 0.03 before the optical break and alpha_R= 1.03 +/- 0.02 after the break, confirming the values found by Zhuchkov et al.(GCN 7803).
GCN Circular #7814
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:
Xinglong EST started to observe the GRB080603B (Mangano et al., GCN 7794) from 14:42 UT Jun 04 with R and V filters. with the same calibration star as used in GCN7803 (Zhuchkov et al.) USNO-A2 1575-03195804 R=13.8 mag, we estimated the brightness of OT R ~ 20.3 +/- 0.15, which is consistent with the powler decay after the break given it GCN7803. Observation is still under going.
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For more information about Xinglong GRBs Follow-up observations, please visit the website: http://www.xinglong-naoc.org/grb/
GCN Circular #7815
A. Cucchiara and D. B. Fox (Penn State) report:
"Starting on 2008 June 4.13 UT we used the Marcario LRS spectrograph on the Hobby-Eberly Telescope (R ~ 230) to obtain 2 x 900s spectra of the optical afterglow of GRB 080603B (GCN 7792, GCN 7794). The spectrum covers the wavelength range 4500 to 10,000 Angstrom.
We clearly detect the Lyman break and several metal absorption features corresponding to a redshift z = 2.69. No other systems are detected and our result confirms the redshift determination by Fynbo et al. (GCN 7797).
We thank the HET staff for performing this challenging observation, in particular Matthew Shetrone."
GCN Circular #7823
D. A. Kann, U. Laux and S. Ertel (TLS Tautenburg) report:
We observed the field of the Swift GRB 080603B (Mangano et al., GCN 7794) with the TLS 1.34m Schmidt telescope in mediocre observing conditions (low airmass but high humidity and moderate transparency). We obtained a total of 6 x 600 sec images at mid-time June 4.980179. The afterglow (Rujopakarn, Guver, & Smith, GCN 7792) is faintly visible in each image. We stacked all six images. Assuming the USNOB1.0 star with ID 1580-0163070 at RA = 11:46:29.297, Dec. +68:03:23.43 (USNOB1.0 catalog value) to have R1 = 17.97 mag, we measure for the afterglow:
```
dt	Rc	dRc

1.16197	21.32	0.04 (statistical only)
```
In comparison to the magnitude measured by Xin et al. (GCN 7814) 0.8 days after the GRB, this implies a steep decay of alpha ~ 2.5. It is unclear if this is due to a break or to the use of different comparison stars. The comparison star used by Zhuchkov et al. GCN 7803, and Xin et al., GCN 7814, is saturated in our images. Further observations are warranted.
This message may be cited.
GCN Circular #7827
A. A. Miller, J. S. Bloom, and D. A. Perley (UC Berkeley) report:
We observed the optical afterglow of GRB080603B (Mangano et al., GCN 7794) with the 1.3m Peters Automated Infrared Imaging Telescope (PAIRITEL) starting 7.66 hours post trigger on June 04, 2008 UT. We detected the afterglow in a 2291 sec mosiac of 7.8 sec simultaneous exposures in the J, H, and Ks filters. Preliminary photometry for the afterglow in exposures beginning on Jun 04.14 UT yields J = 17.9 +- 0.1, H = 17.2 +- 0.1, and Ks = 16.7 +- 0.15, calibrated to the 2MASS system.
GCN Circular #7840
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 080603B (GCN 7794) at a frequency of 8.46 GHz on 2008 June 05.16 UT. The GRB radio afterglow is undetected and the peak radio flux at the SWIFT-UVOT position (GCN 7794) is 11 =B1 41 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #7865
D. A. Kann, U. Laux and S. Ertel (TLS Tautenburg) report:
We observed again the field of the Swift GRB 080603B (Mangano et al., GCN 7794) with the TLS 1.34m Schmidt telescope. The observing conditions changed rapidly, from passing clouds and moonlight to excellent conditions. We obtained a total of 11 x 600 sec images in the R band. The first five images were lost due to high background as well as passing clouds. We stacked the final six images, which have a mid-time of June 8.98085. The afterglow (Rujopakarn, Guver, & Smith, GCN 7792) is not detected anymore in the stack. Using the same comparison star as Kann et al. (GCN 7823), we derive a 2 sigma upper limit of R > 23.7 at 5.132644 days after the GRB.
Comparing this value with the one determined at 1.16 days after the GRB by Kann et al. (GCN 7823) (R = 21.32), we find a decay slope alpha > 1.47. While this does not allow any assertion on the reality of the steep decay slope (alpha ~ 2.5) reported by Kann et al. (GCN 7823), it is steeper than the slope reported (alpha_R=-1.14+/-0.09) by Zhuchkov et al. (GCN 7803) and confirmed by Xin et al. (GCN 7814), indicating that another break in the light curve must have occurred, independent of calibration issues. As the slope reported by Zhuchkov et al. (GCN 7803) is much too shallow to be a post-jet break slope, this indicates that the second break is very probably a jet break. The slope reported by Kann et al. (GCN 7823) is in accordance with a post-jet break slope. This then leads to the interesting question of the origin of the first break Zhuchkov et al. detected, as it is much to strong to be a cooling break (Delta alpha_R = 0.55 versus the theoretical value of Delta alpha = 0.25 for a cooling break).
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GCN Circular #7869
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of Swift GRB 080603b (Mangano et al., GCN 7794) on June 06 betwen (UT) 19:20:31 - 20:27:07 with Zeiss-1000 (Simeiz) telescope of CrAO observatory with favorable weather conditions. We do not detect optical afterglow (Rujopakarn, et al., GCN 7792) in a combined image of R-band up to 22.5 (3sigma). A photmetry is obtained in comparison with nearby USNOB-1.0 stars:
```
UT,       Exposure,   UL
(mid time)

3.011 d   33x120 s    22.5 (3sigma)
```
The message may be cited.
GCN Circular #7890
E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed afterglow (Rujopakarn, et al., GCN 7792) of Swift GRB 0800603b (Mangano et al., GCN 7794) with 1.5 m telescope of Sayan observatory (Mondy) on Jun.04 between (UT) 18:35 - 19:11. The afterglow is detected in a combined image of 8x120 s exposure. A photometry of the afterglow obtained against several USNO-A2.0 stars is following:
```
T0+       Exposure  R_mag
(mid)

0.9686 d  8x120 s   21.10 +/- 0.10
```
This photometry confirms the steep decay of a light curve (alpha ~ 2.5) suggested by Kann et al. (GCN 7824). The message may be cited.
GCN Report 144.1
GCN_Report 144.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_144_1.pdf by V. Mangano at INAF IASF Pa titled: "Final Swift Observations on GRB 080603B"
GCN Circular #7974
V. Rumyantsev, K. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the afterglow (Rujopakarn, et al., GCN 7792) of the Swift GRB 080603B (Mangano et al., GCN 7794) on June 04 between (UT) 19:49:07 - 20:49:27 with AZT-11 (Nauchny) telescope of CrAO observatory in R-band. In a combined image we detect the afterglow. A photometry is obtained in comparison with nearby USNOB-1.0 stars:
```
T0+     Exposure  R_mag            UL
(mid)

1.0087 d  19x180    21.30 +/- 0.25   21.8
```
The message may be cited.
GCN Circular #7975
M. Ibrahimov, R. Karimov (MAO), V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the afterglow (Rujopakarn, et al., GCN 7792) of the Swift GRB 080603B (Mangano et al., GCN 7794) on June 04 between (UT) 16:12:24 - 16:34:23 with AZT-22 (Maidanak) telescope of MAO observatory in R-band. The afterglow is well detected in each individual frame.
A photometry of the two combined images is obtained in comparison with nearby USNOB-1.0 stars:
```
T0+     Exposure  R_mag
(mid)

0.8571 d 2x300 20.49 +/- 0.07
0.8703 d 3x300 20.71 +/- 0.08
```
The message may be cited.
1202.0736 from 6 Feb 12
Martin Jelinek et al.: BOOTES Observation of GRB 080603B
We report on multicolor photometry of long GRB080603B afterglow from BOOTES-1B and BOOTES-2. The optical afterglow has already been reported to present a break in the optical lightcurve at 0.12+/-0.2 days after the trigger. We construct the lightcurve and the spectral energy distribution and discuss the nature of the afterglow.

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Jochen Greiner, last update: 08-Feb-2021 [Disclaimer]