Gamma-ray Burst 130803A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:03:08 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     565263,   Seg_Num: 0
GRB_RA:          220.241d {+14h 40m 58s} (J2000),
                 220.417d {+14h 41m 40s} (current),
                 219.593d {+14h 38m 22s} (1950)
GRB_DEC:          -2.467d {-02d 28' 01"} (J2000),
                  -2.525d {-02d 31' 28"} (current),
                  -2.254d {-02d 15' 12"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2236 [cnts]    Image_Peak=104 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   43     E_range: 25-100 keV
BKG_INTEN:       27421 [cnts]
BKG_TIME:        36157.13 SOD {10:02:37.13} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16507 TJD;   215 DOY;   13/08/03
GRB_TIME:        36172.49 SOD {10:02:52.49} UT
GRB_PHI:         -164.13 [deg]
GRB_THETA:        48.39 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     12.52 [sigma]
IMAGE_SIGNIF:    7.49 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  -2  +0  +0  -4  +0 
SUN_POSTN:       133.69d {+08h 54m 47s}  +17.40d {+17d 24' 12"}
SUN_DIST:         87.63 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       92.91d {+06h 11m 37s}  +19.61d {+19d 36' 47"}
MOON_DIST:       126.00 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      348.99, 50.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      218.62, 12.55 [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 = 160.27,2.15 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=397216976).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:03:36 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     397216976
GRB_RA:          219.740d {+14h 38m 58s} (J2000),
                 219.917d {+14h 39m 40s} (current),
                 219.091d {+14h 36m 22s} (1950)
GRB_DEC:          -2.840d {-02d 50' 23"} (J2000),
                  -2.898d {-02d 53' 52"} (current),
                  -2.625d {-02d 37' 29"} (1950)
GRB_ERROR:       2.80 [deg radius, statistical only]
DATA_SIGNIF:     22.40 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16507 TJD;   215 DOY;   13/08/03
GRB_TIME:        36173.75 SOD {10:02:53.75} UT
GRB_PHI:          99.00 [deg]
GRB_THETA:        84.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       133.69d {+08h 54m 47s}  +17.40d {+17d 24' 12"}
SUN_DIST:         87.27 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:       92.91d {+06h 11m 38s}  +19.61d {+19d 36' 46"}
MOON_DIST:       125.68 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      348.01, 50.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      218.25, 12.04 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=565263).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:03:20 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     397216976
GRB_RA:          215.717d {+14h 22m 52s} (J2000),
                 215.892d {+14h 23m 34s} (current),
                 215.071d {+14h 20m 17s} (1950)
GRB_DEC:          -1.867d {-01d 52' 00"} (J2000),
                  -1.928d {-01d 55' 40"} (current),
                  -1.640d {-01d 38' 22"} (1950)
GRB_ERROR:       6.92 [deg radius, statistical plus systematic]
GRB_INTEN:       427 [cnts/sec]
DATA_SIGNIF:     17.70 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        16507 TJD;   215 DOY;   13/08/03
GRB_TIME:        36173.75 SOD {10:02:53.75} UT
GRB_PHI:          98.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.64
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      60%  GRB
2nd_MOST_LIKELY:  37%  Distant Particles
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       133.69d {+08h 54m 47s}  +17.40d {+17d 24' 12"}
SUN_DIST:         83.14 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:       92.91d {+06h 11m 38s}  +19.61d {+19d 36' 46"}
MOON_DIST:       121.59 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      343.78, 53.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      214.04, 11.67 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 25.12,-23.07 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=565263).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:04:37 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.256d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.471d {-02d 28' 14"} (J2000)
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36262.81 SOD {10:04:22.81} UT,   90.3 [sec] since BAT Trigger Time
COUNTS:          13    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:     Sat 03 Aug 13 10:06:47 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     565263,   Seg_Num: 0
GRB_RA:          220.241d {+14h 40m 58s} (J2000),
                 220.417d {+14h 41m 40s} (current),
                 219.593d {+14h 38m 22s} (1950)
GRB_DEC:          -2.467d {-02d 28' 01"} (J2000),
                  -2.525d {-02d 31' 28"} (current),
                  -2.254d {-02d 15' 12"} (1950)
GRB_DATE:        16507 TJD;   215 DOY;   13/08/03
GRB_TIME:        36172.49 SOD {10:02:52.49} UT
TRIGGER_INDEX:   43
GRB_PHI:         -164.13 [deg]
GRB_THETA:        48.39 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.52 [sigma]
IMAGE_SIGNIF:    7.49 [sigma]
LC_URL:          sw00565263000msb.lc
SUN_POSTN:       133.70d {+08h 54m 47s}  +17.40d {+17d 24' 10"}
SUN_DIST:         87.63 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       92.94d {+06h 11m 45s}  +19.61d {+19d 36' 39"}
MOON_DIST:       125.97 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      348.99, 50.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      218.62, 12.55 [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 = 160.27,2.15 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:07:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.256d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.471d {-02d 28' 14"} (J2000)
POINT_ROLL:      287.540d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36265.69 SOD {10:04:25.69} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.069
N_STARS:         146
X_OFFSET:        568 [pixels]
Y_OFFSET:        469 [pixels]
X_MAX:           1527 [pixels]
Y_MAX:           1428 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00565263000msufc0093.fits
SUN_POSTN:       133.70d {+08h 54m 47s}  +17.40d {+17d 24' 09"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       92.94d {+06h 11m 46s}  +19.61d {+19d 36' 37"}
MOON_DIST:       125.98 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.00, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:07:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.256d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.471d {-02d 28' 14"} (J2000)
POINT_ROLL:      287.540d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36265.69 SOD {10:04:25.69} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.069
N_STARS:         146
X_OFFSET:        568 [pixels]
Y_OFFSET:        469 [pixels]
X_MAX:           1527 [pixels]
Y_MAX:           1428 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw00565263000msufc0093.fits
SUN_POSTN:       133.70d {+08h 54m 47s}  +17.40d {+17d 24' 09"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       92.95d {+06h 11m 48s}  +19.61d {+19d 36' 36"}
MOON_DIST:       125.98 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.00, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [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:     Sat 03 Aug 13 10:08:38 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     565263,   Seg_Num: 0
GRB_RA:          220.2547d {+14h 41m 01.12s} (J2000),
                 220.4310d {+14h 41m 43.42s} (current),
                 219.6067d {+14h 38m 25.61s} (1950)
GRB_DEC:          -2.4929d {-02d 29' 34.4"} (J2000),
                  -2.5506d {-02d 33' 02.0"} (current),
                  -2.2794d {-02d 16' 45.8"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36284.00 SOD {10:04:44.00} UT,   111.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       133.70d {+08h 54m 48s}  +17.40d {+17d 24' 09"}
SUN_DIST:         87.65 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       92.95d {+06h 11m 49s}  +19.61d {+19d 36' 34"}
MOON_DIST:       125.98 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      348.98, 50.32 [deg] galactic lon,lat of the burst
ECL_COORDS:      218.64, 12.53 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:09:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.256d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.471d {-02d 28' 14"} (J2000)
ROLL:            287.540d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36265.69 SOD {10:04:25.69} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     397217076
X_OFFSET:        887 [pixels]
Y_OFFSET:        788 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1047
Y_GRB_POS:       948
BINNING_INDEX:   1
IM_URL:          sw00565263000msuni0104.fits
SUN_POSTN:       133.70d {+08h 54m 48s}  +17.40d {+17d 24' 08"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       92.96d {+06h 11m 50s}  +19.61d {+19d 36' 33"}
MOON_DIST:       125.97 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.00, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [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:     Sat 03 Aug 13 10:09:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.256d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.471d {-02d 28' 14"} (J2000)
ROLL:            287.540d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36265.69 SOD {10:04:25.69} UT,   93.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     397217076
X_OFFSET:        887 [pixels]
Y_OFFSET:        788 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1047
Y_GRB_POS:       948
BINNING_INDEX:   1
IM_URL:          sw00565263000msuni0104.fits
SUN_POSTN:       133.70d {+08h 54m 48s}  +17.40d {+17d 24' 08"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       92.96d {+06h 11m 50s}  +19.61d {+19d 36' 33"}
MOON_DIST:       125.97 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.00, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [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:        All 4 attachments are included.

GCN Circular #15059
K. L. Page (U Leicester), F. E. Marshall (NASA/GSFC), C. J. Mountford (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 10:02:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130803A (trigger=565263). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 220.241, -2.467 which is
```
   RA(J2000) = 14h 40m 58s
   Dec(J2000) = -02d 28' 01"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 50 sec. The peak count rate was ~4750 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 10:04:22.8 UT, 90.3 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 220.25472, -2.49296 which is equivalent to:
```
   RA(J2000)  = 14h 41m 01.13s
   Dec(J2000) = -02d 29' 34.7"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 105 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (4.16 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 7 (+6.70/-4.79) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 93 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is K. L. Page (kpa AT star.le.ac.uk). 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:     Sat 03 Aug 13 10:15:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.258d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.468d {-02d 28' 04"} (J2000)
POINT_ROLL:      287.539d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36477.62 SOD {10:07:57.62} UT,   305.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.859
N_STARS:         164
X_OFFSET:        328 [pixels]
Y_OFFSET:        229 [pixels]
X_MAX:           1767 [pixels]
Y_MAX:           1668 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00565263000msufc0305.fits
SUN_POSTN:       133.70d {+08h 54m 49s}  +17.40d {+17d 24' 04"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       93.02d {+06h 12m 04s}  +19.61d {+19d 36' 18"}
MOON_DIST:       125.92 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.01, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:16:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.258d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.468d {-02d 28' 04"} (J2000)
POINT_ROLL:      287.539d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36477.62 SOD {10:07:57.62} UT,   305.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.859
N_STARS:         164
X_OFFSET:        328 [pixels]
Y_OFFSET:        229 [pixels]
X_MAX:           1767 [pixels]
Y_MAX:           1668 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00565263000msufc0305.fits
SUN_POSTN:       133.70d {+08h 54m 49s}  +17.40d {+17d 24' 04"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       93.02d {+06h 12m 04s}  +19.60d {+19d 36' 18"}
MOON_DIST:       125.92 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.01, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [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:     Sat 03 Aug 13 10:16:43 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     565263,   Seg_Num: 0
GRB_RA:          220.2538d {+14h 41m 00.91s} (J2000),
                 220.4301d {+14h 41m 43.21s} (current),
                 219.6058d {+14h 38m 25.40s} (1950)
GRB_DEC:          -2.4927d {-02d 29' 33.7"} (J2000),
                  -2.5504d {-02d 33' 01.2"} (current),
                  -2.2792d {-02d 16' 45.1"} (1950)
GRB_ERROR:       3.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36284.00 SOD {10:04:44.00} UT,   111.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       133.70d {+08h 54m 49s}  +17.40d {+17d 24' 03"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       93.02d {+06h 12m 06s}  +19.60d {+19d 36' 16"}
MOON_DIST:       125.92 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      348.98, 50.32 [deg] galactic lon,lat of the burst
ECL_COORDS:      218.64, 12.53 [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.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 03 Aug 13 10:17:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.258d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.468d {-02d 28' 04"} (J2000)
ROLL:            287.539d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36477.62 SOD {10:07:57.62} UT,   305.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     397217288
X_OFFSET:        887 [pixels]
Y_OFFSET:        788 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1047
Y_GRB_POS:       948
BINNING_INDEX:   1
IM_URL:          sw00565263000msuni0316.fits
SUN_POSTN:       133.70d {+08h 54m 49s}  +17.40d {+17d 24' 03"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       93.03d {+06h 12m 07s}  +19.60d {+19d 36' 15"}
MOON_DIST:       125.91 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.01, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [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:     Sat 03 Aug 13 10:18:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     565263,   Seg_Num: 0
POINT_RA:        220.258d {+14h 41m 02s} (J2000)
POINT_DEC:        -2.468d {-02d 28' 04"} (J2000)
ROLL:            287.539d
IMG_START_DATE:  16507 TJD;   215 DOY;   13/08/03
IMG_START_TIME:  36477.62 SOD {10:07:57.62} UT,   305.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     397217288
X_OFFSET:        887 [pixels]
Y_OFFSET:        788 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1047
Y_GRB_POS:       948
BINNING_INDEX:   1
IM_URL:          sw00565263000msuni0316.fits
SUN_POSTN:       133.70d {+08h 54m 49s}  +17.40d {+17d 24' 02"}
SUN_DIST:         87.64 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:       93.04d {+06h 12m 10s}  +19.60d {+19d 36' 12"}
MOON_DIST:       125.90 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:      349.01, 50.33 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      218.64, 12.55 [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:        All 4 attachments are included.

GCN Circular #15061
A. Melandri (INAF/OAB), C. Guidorzi (U. Ferrara) and C. G. Mundell (LJMU) report on behalf of a large collaboration:
Tha Faulkes Telescope South robotically observed the field of GRB 130803A starting ~ 2.9 minutes after the Swift trigger (Page et al., GCN 15059). We find no credible afterglow candidate in the XRT error circle.
We estimate a 3 sigma upper limit of R>20.0 (texp=30s) ~3.5 minutes and I>21.9 (texp=700s) ~40 minutes after the burst.
Magnitudes are calibrated against nearby USNOB-1 stars.
GCN Circular #15062
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 2053 s of XRT Photon Counting mode data and 4 UVOT images for GRB 130803A, 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 = 220.25273, -2.49195 which is equivalent to:
```
RA (J2000): 14h 41m 0.66s
Dec (J2000): -02d 29' 31.0"
```
with an uncertainty of 1.8 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) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #15063
GRB 130803A, Swift-BAT refined analysis
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130803A (trigger #565263) (Page, et al., GCN Circ. 15059). The BAT ground-calculated position is RA, Dec = 220.256, -2.499 deg which is
```
    RA(J2000)  =  14h 41m 01.4s
    Dec(J2000) = -02d 29' 58"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%.
The mask-weighted light curve shows two well-separated symmetrical peaks. The first, larger peak starts at about T0-2 seconds and lasts until about T+8 seconds. The second peak, which was softer, starts about T0+41 seconds and lasts until about T0+48 seconds. T90 (15-350 keV) is 44 +- 2 sec (estimated error including systematics).
The time-averaged spectrum from T-1.24 to T+45.76 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.69 +- 0.14. The fluence in the 15-150 keV band is 1.5 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+2.09 sec in the 15-150 keV band is 5.1 +- 0.4 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/565263/BA/
GCN Circular #15064
Subject: GRB 130803A: Fermi GBM observation
Hoi-Fung Yu (MPE) report on behalf of the Fermi GBM Team:
"At 10:02:53.75 UT on 03 Aug 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130803A (trigger 397216976 / 130803419), which was also detected by the Swift BAT and XRT (Page et al. 2013, GCN 15059). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 86 degrees.
The GBM light curve consists of a single pulse, with a duration (T90) of about 7.6 s (50-300 keV). The time-averaged spectrum from T0-1.0 s to T0+4.9 s is adequately fit by a power law function with an exponential high-energy cutoff. The power-law index is -0.85 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 141.6 +/- 12.2 keV.
The event fluence (10-1000 keV) in this time interval is (2.5 +/- 0.1)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.6 s in the 10-1000 keV band is 7.1 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #15065
F. E. Marshall (NASA/GSFC) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130803A 93 s after the BAT trigger (Page et al., GCN Circ. 15059). No optical afterglow consistent with the enhanced XRT position (Osborne et al. GCN Circ. 15062) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposures and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            93          243          147         >21.0
u_FC               305          555          246         >20.3
white               93         6186          560         >21.7
v                  636        11010         1142         >20.8
b                  561         5981          413         >21.0
u                  305         5776          639         >20.7
w1                3936        16308          788         >21.4
m2                5167        11916         1082         >21.2
w2                4757         6392          393         >20.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst
GCN Circular #15066
K. Varela (MPE Garching), P. Afonso (American River College) and J. Greiner (MPE Garching) report on behalf of the GROND team :
We observed the field GRB 130803A (Swift trigger 565263; Page et al., GCN 15059) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al.2008, PASP 120, 405) mounted at the 2.2m MPG/ESO telescope at La Silla Observatory (Chile).
Observations started at 23:13 UT on August 3, about 13.2 hours after the trigger at a mean seeing of 1.8 arcsec and a mean airmass of 1.3. We detect an extended source inside the enhanced 1.4'' XRT error circle (Swift webpage). This could be the GRB host, though at the moment no statement about variability can be made.
For stacked integration times of 100 min. in JHK and ~ 125min in griz, we present the following preliminary magnitudes and ULs at the 3 sigma level:
```
g' = 25.6 +/- 0.4 mag,
r' = 24.4 +/- 0.3 mag,
i' = 23.8 +/- 0.2 mag,
z' = 23.4 +/- 0.3 mag,
J > 23.2 mag,
H > 22.5 mag, and
K > 22.2 mag.
```
Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E(B-V) = 0.05 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15067
Owen Littlejohns (ASU), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels= (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 130803A (Page, et al., GCN 15059) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2013/08 4.15 to 2013/08 4.25 UTC (17.51 to 19.98 hours after the BAT trigger), obtaining a total of 1.53 hours exposure in the r' and i' bands and 0.63 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle, in comparison with SDSS DR9 and 2MASS, we obtain the following upper limits (3-sigma):
```
  r'    > 23.29
  i'    > 23.24
  Z     > 22.27
  Y     > 21.70
  J     > 20.90
  H     > 20.24
```
These magnitudes are in the AB system and not corrected for Galactic extinction in the direction of the GRB. Our upper limits are consistent with the detections and upper limits reported by Varela, et al. (GCN 15066).
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #15068
A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), B. Sbarufatti (INAF-OAB/PSU), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), J.A. Kennea (PSU), V. Mangano (PSU), M.C. Stroh (PSU) and K.L. Page report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 130803A (Page et al. GCN Circ. 15059), from 75 s to 61.7 ks after the BAT trigger. The data comprise 7 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 15062).
The late-time light curve (from T0+3.9 ks) can be modelled with a power-law decay with a decay index of alpha=0.87 (+/-0.09).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.40 (+0.24, -0.23). The best-fitting absorption column is 8.7 (+1.6, -1.4) x 10^21 cm^-2, in excess of the Galactic value of 4.2 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.5 x 10^-11 (1.3 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     8.7 (+1.6, -1.4) x 10^21 cm^-2
Galactic foreground: 4.2 x 10^20 cm^-2
Excess significance: 9.7 sigma
Photon index:	     2.40 (+0.24, -0.23)
```
If the light curve continues to decay with a power-law decay index of 0.87, the count rate at T+24 hours will be 9.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.3 x 10^-13 (1.2 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00565263.
This circular is an official product of the Swift-XRT team.
GCN Circular #15073
K. Varela (MPE Garching), M. Tanga (MPE Garching), P. Afonso (American River College) and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed a second epoch of the field of GRB 130803A (Swift trigger 565263; Page et al., GCN 15059) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al.2008, PASP 120, 405) mounted at the 2.2m MPG/ESO telescope at La Silla Observatory (Chile).
Observations started at 23:34 UT on August 5, about 61.7 hours after the trigger at a mean seeing of 1.5 arcsec and a mean airmass of 1.3. We confirm the detection of the source inside the enhanced 1.4'' XRT error circle (Swift webpage) reported in a previous GCN (Varela et al., GCN15066), and measure consistent magnitudes as compared to the first epoch (the g'-band magnitude contained an error and should read g' = 24.6 +/- 0.4). Thus, we consider this source as the potential host of GRB 130803A.
GCN Report 448.1
GCN_Report 448.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_448_1.pdf by K.L. Page at U.Leicester titled: "Swift Observations of GRB 130803A"

Back to JG's homepage

Jochen Greiner, last update: 07-Aug-2013 [Disclaimer]