Gamma-ray Burst 130502A

(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:     Thu 02 May 13 17:53:59 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     554996,   Seg_Num: 0
GRB_RA:          138.578d {+09h 14m 19s} (J2000),
                 138.748d {+09h 15m 00s} (current),
                 137.937d {+09h 11m 45s} (1950)
GRB_DEC:          -0.143d {-00d 08' 35"} (J2000),
                  -0.199d {-00d 11' 55"} (current),
                  +0.065d {+00d 03' 52"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       391 [cnts]    Image_Peak=49 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10418     E_range: 25-100 keV
BKG_INTEN:       25581 [cnts]
BKG_TIME:        64221.49 SOD {17:50:21.49} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16414 TJD;   122 DOY;   13/05/02
GRB_TIME:        64230.45 SOD {17:50:30.45} UT
GRB_PHI:         -171.56 [deg]
GRB_THETA:        43.27 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.07 [sigma]
IMAGE_SIGNIF:    7.75 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  -2  +0  +0 +14  +0 
SUN_POSTN:        40.04d {+02h 40m 09s}  +15.58d {+15d 34' 59"}
SUN_DIST:         98.44 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.80d {+21h 07m 12s}  -10.98d {-10d 58' 50"}
MOON_DIST:       168.65 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.23, 31.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      141.06,-15.39 [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 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 = 12.77,-13.50 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=389209833).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 02 May 13 17:50:58 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     389209833
GRB_RA:          130.883d {+08h 43m 32s} (J2000),
                 131.068d {+08h 44m 16s} (current),
                 130.189d {+08h 40m 45s} (1950)
GRB_DEC:         +14.267d {+14d 16' 00"} (J2000),
                 +14.218d {+14d 13' 05"} (current),
                 +14.448d {+14d 26' 52"} (1950)
GRB_ERROR:       12.33 [deg radius, statistical plus systematic]
GRB_INTEN:       167 [cnts/sec]
DATA_SIGNIF:     6.20 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        16414 TJD;   122 DOY;   13/05/02
GRB_TIME:        64230.74 SOD {17:50:30.74} UT
GRB_PHI:         110.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.28
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN:        40.04d {+02h 40m 09s}  +15.58d {+15d 34' 56"}
SUN_DIST:         87.18 [deg]   Sun_angle= -6.1 [hr] (East of Sun)
MOON_POSTN:      316.77d {+21h 07m 05s}  -10.99d {-10d 59' 20"}
MOON_DIST:       173.57 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      212.15, 31.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      129.47, -3.75 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 23.00,-0.08 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 02 May 13 17:51:10 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     389209833
GRB_RA:          133.810d {+08h 55m 14s} (J2000),
                 133.988d {+08h 55m 57s} (current),
                 133.142d {+08h 52m 34s} (1950)
GRB_DEC:          +7.680d {+07d 40' 48"} (J2000),
                  +7.629d {+07d 37' 43"} (current),
                  +7.872d {+07d 52' 18"} (1950)
GRB_ERROR:       8.35 [deg radius, statistical only]
DATA_SIGNIF:     8.60 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        16414 TJD;   122 DOY;   13/05/02
GRB_TIME:        64230.74 SOD {17:50:30.74} UT
GRB_PHI:         113.00 [deg]
GRB_THETA:        37.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:        40.04d {+02h 40m 09s}  +15.58d {+15d 34' 57"}
SUN_DIST:         91.73 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      316.77d {+21h 07m 06s}  -10.99d {-10d 59' 18"}
MOON_DIST:       175.66 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      220.54, 30.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.05, -9.32 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 17:54:32 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.576d {+09h 14m 18s} (J2000)
POINT_DEC:        -0.136d {-00d 08' 10"} (J2000)
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64321.81 SOD {17:52:01.81} UT,   91.4 [sec] since BAT Trigger Time
COUNTS:          5    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:     Thu 02 May 13 17:55:47 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     554996,   Seg_Num: 0
GRB_RA:          138.578d {+09h 14m 19s} (J2000),
                 138.748d {+09h 15m 00s} (current),
                 137.937d {+09h 11m 45s} (1950)
GRB_DEC:          -0.143d {-00d 08' 35"} (J2000),
                  -0.199d {-00d 11' 55"} (current),
                  +0.065d {+00d 03' 52"} (1950)
GRB_DATE:        16414 TJD;   122 DOY;   13/05/02
GRB_TIME:        64230.64 SOD {17:50:30.64} UT
TRIGGER_INDEX:   10418
GRB_PHI:         -171.56 [deg]
GRB_THETA:        43.27 [deg]
DELTA_TIME:      44.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.07 [sigma]
IMAGE_SIGNIF:    7.75 [sigma]
LC_URL:          sw00554996000msb.lc
SUN_POSTN:        40.04d {+02h 40m 10s}  +15.58d {+15d 34' 60"}
SUN_DIST:         98.44 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.82d {+21h 07m 16s}  -10.98d {-10d 58' 31"}
MOON_DIST:       168.66 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.23, 31.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      141.06,-15.39 [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 = 12.77,-13.50 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 17:56:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.577d {+09h 14m 18s} (J2000)
POINT_DEC:        -0.136d {-00d 08' 09"} (J2000)
POINT_ROLL:      285.702d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64326.28 SOD {17:52:06.28} UT,   95.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.292
N_STARS:         39
X_OFFSET:        437 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1396 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00554996000msufc0095.fits
SUN_POSTN:        40.04d {+02h 40m 10s}  +15.58d {+15d 35' 00"}
SUN_DIST:         98.44 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.82d {+21h 07m 17s}  -10.97d {-10d 58' 25"}
MOON_DIST:       168.67 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 17:56:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.577d {+09h 14m 18s} (J2000)
POINT_DEC:        -0.136d {-00d 08' 09"} (J2000)
POINT_ROLL:      285.702d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64326.28 SOD {17:52:06.28} UT,   95.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.292
N_STARS:         39
X_OFFSET:        437 [pixels]
Y_OFFSET:        504 [pixels]
X_MAX:           1396 [pixels]
Y_MAX:           1463 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00554996000msufc0095.fits
SUN_POSTN:        40.04d {+02h 40m 10s}  +15.58d {+15d 35' 01"}
SUN_DIST:         98.44 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.83d {+21h 07m 19s}  -10.97d {-10d 58' 20"}
MOON_DIST:       168.67 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [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:     Thu 02 May 13 17:57:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.577d {+09h 14m 18s} (J2000)
POINT_DEC:        -0.136d {-00d 08' 09"} (J2000)
ROLL:            285.702d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64326.28 SOD {17:52:06.28} UT,   95.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389209936
X_OFFSET:        756 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00554996000msuni0106.fits
SUN_POSTN:        40.04d {+02h 40m 10s}  +15.58d {+15d 35' 01"}
SUN_DIST:         98.44 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.84d {+21h 07m 20s}  -10.97d {-10d 58' 11"}
MOON_DIST:       168.68 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [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:     Thu 02 May 13 17:57:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.577d {+09h 14m 18s} (J2000)
POINT_DEC:        -0.136d {-00d 08' 09"} (J2000)
ROLL:            285.702d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64326.28 SOD {17:52:06.28} UT,   95.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389209936
X_OFFSET:        756 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00554996000msuni0106.fits
SUN_POSTN:        40.04d {+02h 40m 10s}  +15.58d {+15d 35' 02"}
SUN_DIST:         98.44 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.84d {+21h 07m 21s}  -10.97d {-10d 58' 09"}
MOON_DIST:       168.68 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 18:01:05 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     554996,   Seg_Num: 0
GRB_RA:          138.5704d {+09h 14m 16.89s} (J2000),
                 138.7411d {+09h 14m 57.86s} (current),
                 137.9299d {+09h 11m 43.18s} (1950)
GRB_DEC:          -0.1224d {-00d 07' 20.6"} (J2000),
                  -0.1781d {-00d 10' 41.2"} (current),
                  +0.0853d {+00d 05' 07.1"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64335.00 SOD {17:52:15.00} UT,   104.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        40.04d {+02h 40m 10s}  +15.58d {+15d 35' 04"}
SUN_DIST:         98.42 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.87d {+21h 07m 28s}  -10.96d {-10d 57' 38"}
MOON_DIST:       168.71 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.20, 31.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      141.04,-15.38 [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 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 18:04:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.579d {+09h 14m 19s} (J2000)
POINT_DEC:        -0.134d {-00d 08' 03"} (J2000)
POINT_ROLL:      285.704d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64539.28 SOD {17:55:39.28} UT,   308.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.704
N_STARS:         115
X_OFFSET:        197 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1636 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00554996000msufc0308.fits
SUN_POSTN:        40.05d {+02h 40m 11s}  +15.59d {+15d 35' 06"}
SUN_DIST:         98.43 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.89d {+21h 07m 35s}  -10.95d {-10d 57' 06"}
MOON_DIST:       168.71 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 18:04:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.579d {+09h 14m 19s} (J2000)
POINT_DEC:        -0.134d {-00d 08' 03"} (J2000)
POINT_ROLL:      285.704d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64539.28 SOD {17:55:39.28} UT,   308.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.704
N_STARS:         115
X_OFFSET:        197 [pixels]
Y_OFFSET:        264 [pixels]
X_MAX:           1636 [pixels]
Y_MAX:           1703 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00554996000msufc0308.fits
SUN_POSTN:        40.05d {+02h 40m 11s}  +15.59d {+15d 35' 06"}
SUN_DIST:         98.43 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.90d {+21h 07m 35s}  -10.95d {-10d 57' 04"}
MOON_DIST:       168.71 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [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:     Thu 02 May 13 18:05:01 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     554996,   Seg_Num: 0
GRB_RA:          138.5689d {+09h 14m 16.53s} (J2000),
                 138.7396d {+09h 14m 57.50s} (current),
                 137.9284d {+09h 11m 42.82s} (1950)
GRB_DEC:          -0.1232d {-00d 07' 23.5"} (J2000),
                  -0.1789d {-00d 10' 44.1"} (current),
                  +0.0845d {+00d 05' 04.2"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64335.00 SOD {17:52:15.00} UT,   104.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        40.05d {+02h 40m 11s}  +15.59d {+15d 35' 07"}
SUN_DIST:         98.42 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.90d {+21h 07m 37s}  -10.95d {-10d 56' 58"}
MOON_DIST:       168.72 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.20, 31.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      141.04,-15.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 18:05:40 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.579d {+09h 14m 19s} (J2000)
POINT_DEC:        -0.134d {-00d 08' 03"} (J2000)
ROLL:            285.704d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64539.28 SOD {17:55:39.28} UT,   308.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389210149
X_OFFSET:        756 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00554996000msuni0319.fits
SUN_POSTN:        40.05d {+02h 40m 11s}  +15.59d {+15d 35' 07"}
SUN_DIST:         98.43 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.91d {+21h 07m 38s}  -10.95d {-10d 56' 51"}
MOON_DIST:       168.71 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [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:     Thu 02 May 13 18:05:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     554996,   Seg_Num: 0
POINT_RA:        138.579d {+09h 14m 19s} (J2000)
POINT_DEC:        -0.134d {-00d 08' 03"} (J2000)
ROLL:            285.704d
IMG_START_DATE:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64539.28 SOD {17:55:39.28} UT,   308.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389210149
X_OFFSET:        756 [pixels]
Y_OFFSET:        823 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       983
BINNING_INDEX:   1
IM_URL:          sw00554996000msuni0319.fits
SUN_POSTN:        40.05d {+02h 40m 11s}  +15.59d {+15d 35' 07"}
SUN_DIST:         98.43 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.91d {+21h 07m 39s}  -10.95d {-10d 56' 49"}
MOON_DIST:       168.71 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.22, 31.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      141.05,-15.39 [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 #14527
E. Troja (NASA/GSFC/UMCP), A. A. Breeveld (UCL-MSSL), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), N. Gehrels (NASA/GSFC), S. T. Holland (STScI), H. A. Krimm (CRESST/GSFC/USRA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC), M. C. Stroh (PSU), C. A. Swenson (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 17:50:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130502A (trigger=554996). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 138.578, -0.143 which is
```
   RA(J2000) = 09h 14m 19s
   Dec(J2000) = -00d 08' 35"
```
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 5 sec. The rapidly available light curve also shows a peak in the lowest energy at T+10 sec, but it is not clear at this time whether or not the second peak is real. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 17:52:01.8 UT, 91.4 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 138.5690, -0.1232 which is equivalent to:
```
   RA(J2000)  = 09h 14m 16.56s
   Dec(J2000) = -00d 07' 23.7"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 78 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.49 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.5 (+1.77/-1.57) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 95 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is E. Troja (eleonora.troja AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #14528
T. Guver (Sabanci Univ.), B. Ozcan (Adiyaman Univ.) E. Sonbas (Adiyaman Univ.), M. Kocak (TUG), E. Gogus (Sabanci Univ.), H. Kirbiyik (TUG) report on behalf of a larger collaboration
We observed the field of Swift GRB 130502A (Troja et al. GCN#14527) with the 1.0 meter T100 telescope (TUBITAK National Observatory, Antalya - Turkey), starting May, 02, 18:17:41 UT (~ 27 minutes after the trigger). Observations were carried out in the R filter under good weather conditions.
We do not detect an optical afterglow within the reported XRT error circle down to a limiting magnitude of 20.8 in the R band. Our image is calibrated using USNO A2.0 R1 magnitude of the star at RA : 135.578498, DEC : -00.149362 (J2000).
We are grateful to the TUBITAK National Observatory staff for promptly scheduling the observations and their technical support.
GCN Circular #14529
T. Guver (Sabanci Univ.), B. Ozcan (Adiyaman Univ.) E. Sonbas (Adiyaman Univ.), M. Kocak (TUG), E. Gogus (Sabanci Univ.), H. Kirbiyik (TUG) report on behalf of a larger collaboration
We observed the field of Swift GRB 130502A (Troja et al. GCN#14527) with the 1.0 meter T100 telescope (TUBITAK National Observatory, Antalya - Turkey), starting May, 02, 18:17:41 UT (~ 27 minutes after the trigger). Observations were carried out in the R filter under good weather conditions.
We do not detect an optical afterglow within the reported XRT error circle down to a limiting magnitude of 20.8 in the R band. Our image is calibrated using USNO A2.0 R1 magnitude of the star at RA : 135.578498, DEC : -00.149362 (J2000).
We are grateful to the TUBITAK National Observatory staff for promptly scheduling the observations and their technical support.
GCN Circular #14531
D. Malesani (DARK/NBI), P. D'Avanzo (INAF/OABr), M. Cecconi (INAF/FGG), C. P. Padilla-Torres (INAF/FGG), report on behalf of the CIBO collaboration:
We observed the field of GRB 130502A (Troja et al., GCN 14527) with the TNG equipped with DOLoRes. A 10-minute image in the SDSS r filer was taken starting on May 2.872 UT (3.08 hr after the GRB trigger).
Close to the edge of the current XRT error circle (see http://www.swift.ac.uk/xrt_positions/), we detect a faint object, with coordinates (J2000):
```
RA = 09:14:16.42
Dec = -00:07:23.0
```
The object has r = 23.49 +- 0.16 AB, calibrated against nearby SDSS DR8 stars.
At the present time, we cannot assess the variability of the target, nor its relation with GRB 130502A. Further observations are planned.
GCN Circular #14533
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), J. Gorosabel (UPV/EHU, IAA-CSIC), N. Tanvir (U. Leicester), J. P. U. Fynbo (DARK/NBI), A. Cabrera-Lavers (IAC-ULL), and C.C. Thoene (IAA-CSIC) report:
We observed the afterglow of GRB 130502A (Troja et al. GCN 14527) with the 10.4m GTC telescope starting at 21:01 UT (3.18 hrs after the burst). The observation had a total exposure time of 340 s in z-band. The object reported by Malesani et al. GCN 14531 is detected with an AB magnitude of 22.6+/-0.15 as compared to stars in the SDSS DR9 catalogue.
GCN Circular #14535
J. Gorosabel (IAA-CSIC/UPV-EHU), A. de Ugarte Postigo (IAA-CSIC/DARK-NBI), J.C. Tello (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC), J. Cepa (IAC), D. Jimenez-Mejias (IAC), R. Alonso (IAC), R. Sanchez-Ramirez (IAA-CSIC), V. Casanova (IAA-CSIC), report on behalf of a larger collaboration:
We observed the GRB 130502A (Troja et al. GCN 14527) optical afterglow (Malesani et al. GCN 14531; de Ugarte Postigo et al. GCN 14533) in I-band with both the 1.5m OSN and 0.82m IAC80 telescopes as follows;
```
  Tel.  Hr post-GRB  Texp  Vega(Mag)
 -------------------------------------
 OSN    3.13-3.71  10x200s  > 22.0
 IAC80  3.43-5.14  16x300s 22.75+/-0.35
 -------------------------------------
```
calibrated against the USNO B1.0 catalogue.
GCN Circular #14536
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 511 s of XRT Photon Counting mode data and 1 UVOT images for GRB 130502A, 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 = 138.56888, -0.12341 which is equivalent to:
```
RA (J2000): 09h 14m 16.53s
Dec (J2000): -00d 07' 24.3"
```
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 #14539
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), Willia= m 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), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC)= , Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UN= AM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley= (GSFC) report:
We observed the field of GRB 130502A (Troja, et al., GCN 14527) 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 2013/05 3.14 to 2013/05 3.17 UTC (9.48 to 10.34 hours after the BAT trigger), obtaining a total of 0.71 hours exposure in the r' and i' bands and 0.30 hours exposure in the Z, Y, J, a= nd H bands.
For a source within the Swift-XRT error circle (Beardmore, et al., GCN 14536), in comparison with SDSS DR8 and 2MASS, we obtain the following upper limits (3-sigma):
```
  r'    > 22.82
  i'    > 22.66
  Z    > 21.65
  Y    > 21.45
  J    > 21.16
  H    > 20.99
```
These magnitudes are in the AB system and not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedr= o M=E1rtir.
GCN Circular #14543
A. A. Breeveld (MSSL-UCL) and E. Troja (NASA/GSFC/UMCP) report on behalf=20 of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130502A 96=20 s after the BAT trigger (Troja et al., GCN Circ. 14527). An optical afterglow consistent with the position of the TNG candidate=20 (Malesani et al. GCN Circ. 14531) is detected in the initial white=20 exposure. Preliminary magnitude and 3-sigma upper limits using the UVOT=20 photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for=20 the first white finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)    Exp(s)     Mag

white_FC         96         246          147        20.90 =B1 0.3
white           588         608           20        >20.06
u               309         559          246        >20.6
b               564         584           20        >19.25
v              5288        5488          197        >19.81
uvw1           5698        5898          197        >20.16
uvm2           5492        5692          197        >19.96
```
The magnitudes in the table are not corrected for the Galactic=20 extinction due to the reddening of E(B-V) =3D 0.03 in the direction of th= e=20 burst (Schlegel et al. 1998).
GCN Circular #14545
G. Younes (NASA/USRA) reports on behalf of the Fermi GBM Team:
"At 17:50:30.74 UT on May 2 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130502A (trigger 389209833 / 130502743), which was also detected by the Swift/BAT (Troja et al. 2013, GCN 14527). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 20 degrees from Swift location.
The GBM light curve consists of a single pulse with a FRED-like shape with a duration (T90) of about 3 s (50-300 keV). The time-averaged spectrum from T0-0.384 s to T0+2.880 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.0 +/- 0.3 and the cutoff energy, parameterized as Epeak, is 83 +/- 17 keV.
The event fluence (10-1000 keV) in this time interval is (5.0 +/- 0.6)E-07 erg/cm^2. The 0.064-sec peak photon flux measured starting from T0-0.064 s in the 8-1000 keV band is 7 +/- 1 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #14547
M.C. Stroh (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), B. Sbarufatti (INAF-OAB/PSU), G. Stratta (ASDC), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU) and E. Troja report on behalf of the Swift-XRT team:
We have analysed 2.3 ks of XRT data for GRB 130502A (Troja et al. GCN Circ. 14527), from 76 s to 16.0 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=0.68 (+/-0.07).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.2 (+/-0.3). The best-fitting absorption column is 1.6 (+0.8, -0.7) x 10^21 cm^-2, in excess of the Galactic value of 2.5 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 3.4 x 10^-11 (5.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.6 (+0.8, -0.7) x 10^21 cm^-2
Galactic foreground: 2.5 x 10^20 cm^-2
Excess significance: 3.2 sigma
Photon index:	     2.2 (+/-0.3)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00554996.
This circular is an official product of the Swift-XRT team.
GCN Circular #14548
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB130502A 55 sec after notice time and 266 sec after GRB time at 2013-05-02 17:54:56.337 UT in two polarizations. On our first (50s exposure) set we haven`t found optical transient within SWIFT error-box (E. Troja et. al. GCN 14527). The 5-sigma upper limit has been about 18.5 mag The message may be cited.
GCN Circular #14550
S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), A. Y. Lien (NASA/GSFC/ORAU), T. Sakamoto (AGU), C. B. Markwardt (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), J. Tueller (GSFC), T. N. Ukwatta (MSU) (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 130502A (trigger #554996) (Troja, et al., GCN Circ. 14527). The BAT ground-calculated position is RA, Dec = 138.579, -0.134 deg, which is
```
   RA(J2000)  =  09h 14m 19.1s
   Dec(J2000) = -00d 08' 04.2"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%.
The mask-weighted light curve consists a single FRED pulse starting at ~T-0.3 sec, peaking at ~T+0.1 sec, and returning to baseline at ~T+4 sec. T90 (15-350 keV) is 3.0 +- 0.3 sec (estimated error including systematics).
The time-averaged spectrum from T-0.19 to T+3.20 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.16. The fluence in the 15-150 keV band is 3.8 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.21 sec in the 15-150 keV band is 2.9 +- 0.3 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/554996/BA/
ATEL #5042
Title: An untriggered optical detection of GRB 130427A
Author: A. J. Drake, S. G. Djorgovski, A. A. Mahabal, M. J. Graham, R. Williams (Caltech); J. Prieto (Princeton); M. Catelan (PUC Chile); E. Christensen, S. M. Larson (LPL/ UA)
During the course of the regular survey operations the Catalina Real-time Transient Survey (CRTS) automatically detected new optical source CSS130502:113233+274156 at RA=11:32:32.90, Dec=+27:41:56.5 (J2000). Based on four observations spanning the period May 02.191 to 02.211UT the transient was found to have V=19.6+/-0.2. A public alert for the transient detection was automatically sent to VOEventNet sources such as SkyAlert within minutes of observation. Subsequently, a clear match between CSS130502:113233+274156 and the recent luminous GRB 130427A (Palmer et al. 2013, GCN#14448, Elenin et al. 2013, GCN#14450) was discovered.
The untriggered optical detection of GRB 130427A by CRTS makes this one of the few GRBs that have been detected without prior knowledge of the event. Furthermore, this detection suggests that the increased cadence and coverage of the CRTS-II project, along with other future transient surveys, will strongly constrain the existence of GRB-related events such as orphan afterglows.
We wish to thank D. Bishop for bringing the correspondence between CSS130502:113233+274 and GRB 130427A to our attention.
GCN Circular #14581
V. Rumyantsev (CrAO), K.Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 130502A (Troja et al., GCN 14527) with AZT-11 telescope of CrAO observatory on May 02 starting on (UT) 18:20:46, i.e. ~30 min after burst trigger. We took several images in R-filter of 180 s exposure. Within enchanced XRT position (Beardmore et al., GCN 14536) we do not detect any source. Preliminary photometry of a combined image is following
```
T_start (UT)           T0+     Filter  Exp. OT  UpperLimit (3 sigma)
                        mid,days        s

2013-05-02T18:20:46.18 0.0419  R      3600  n/d 20.8
```
The photometry is based on USNO-B1.0 star 0898-0181247 09 14 15.80 -00 08 13.7 assuming R=18.02.

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