Gamma-ray Burst 140502A

(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:     Fri 02 May 14 08:30:40 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     597841,   Seg_Num: 0
GRB_RA:          319.155d {+21h 16m 37s} (J2000),
                 319.278d {+21h 17m 07s} (current),
                 318.724d {+21h 14m 54s} (1950)
GRB_DEC:         +49.018d {+49d 01' 04"} (J2000),
                 +49.078d {+49d 04' 42"} (current),
                 +48.808d {+48d 48' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4099 [cnts]    Image_Peak=195 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       23880 [cnts]
BKG_TIME:        30604.04 SOD {08:30:04.04} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16779 TJD;   122 DOY;   14/05/02
GRB_TIME:        30620.48 SOD {08:30:20.48} UT
GRB_PHI:         142.20 [deg]
GRB_THETA:        10.49 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     17.77 [sigma]
IMAGE_SIGNIF:    7.76 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2  +0  +1 -30  +0 
SUN_POSTN:        39.43d {+02h 37m 44s}  +15.39d {+15d 23' 42"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.22d {+05h 12m 52s}  +18.87d {+18d 52' 00"}
MOON_DIST:        93.19 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.02, -0.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      349.36, 59.68 [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 = 339.23,9.90 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=420712223).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 02 May 14 08:30:44 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     420712223
GRB_RA:          318.050d {+21h 12m 12s} (J2000),
                 318.190d {+21h 12m 46s} (current),
                 317.562d {+21h 10m 15s} (1950)
GRB_DEC:         +39.233d {+39d 13' 60"} (J2000),
                 +39.293d {+39d 17' 34"} (current),
                 +39.027d {+39d 01' 37"} (1950)
GRB_ERROR:       30.23 [deg radius, statistical plus systematic]
GRB_INTEN:       111 [cnts/sec]
DATA_SIGNIF:     5.20 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        16779 TJD;   122 DOY;   14/05/02
GRB_TIME:        30620.11 SOD {08:30:20.11} UT
GRB_PHI:          56.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.24
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      84%  GRB
2nd_MOST_LIKELY:  11%  Cyg X-1
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        39.43d {+02h 37m 44s}  +15.40d {+15d 23' 42"}
SUN_DIST:         73.64 [deg]   Sun_angle= 5.4 [hr] (West of Sun)
MOON_POSTN:       78.22d {+05h 12m 52s}  +18.87d {+18d 52' 01"}
MOON_DIST:        99.30 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       83.38, -6.25 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      338.80, 51.84 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140502354/quicklook/glg_lc_medres34_bn140502354.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 308.00,25.50 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=597841).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 02 May 14 08:31:41 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.156d {+21h 16m 37s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 13"} (J2000)
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30691.31 SOD {08:31:31.31} UT,   70.8 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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:     Fri 02 May 14 08:33:51 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     597841,   Seg_Num: 0
GRB_RA:          319.155d {+21h 16m 37s} (J2000),
                 319.278d {+21h 17m 07s} (current),
                 318.724d {+21h 14m 54s} (1950)
GRB_DEC:         +49.018d {+49d 01' 04"} (J2000),
                 +49.078d {+49d 04' 42"} (current),
                 +48.808d {+48d 48' 29"} (1950)
GRB_DATE:        16779 TJD;   122 DOY;   14/05/02
GRB_TIME:        30620.48 SOD {08:30:20.48} UT
TRIGGER_INDEX:   146
GRB_PHI:         142.20 [deg]
GRB_THETA:        10.49 [deg]
DELTA_TIME:      -43.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     17.77 [sigma]
IMAGE_SIGNIF:    7.76 [sigma]
LC_URL:          sw00597841000msb.lc
SUN_POSTN:        39.43d {+02h 37m 44s}  +15.40d {+15d 23' 44"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.24d {+05h 12m 59s}  +18.87d {+18d 52' 03"}
MOON_DIST:        93.20 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.02, -0.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      349.36, 59.68 [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 = 339.23,9.90 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 02 May 14 08:34:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.156d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 13"} (J2000)
POINT_ROLL:      86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30695.47 SOD {08:31:35.47} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.802
N_STARS:         190
X_OFFSET:        469 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1428 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00597841000msufc0074.fits
SUN_POSTN:        39.43d {+02h 37m 44s}  +15.40d {+15d 23' 45"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.25d {+05h 13m 01s}  +18.87d {+18d 52' 04"}
MOON_DIST:        93.20 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.02, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 02 May 14 08:35:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.156d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 13"} (J2000)
POINT_ROLL:      86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30695.47 SOD {08:31:35.47} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.802
N_STARS:         190
X_OFFSET:        469 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1428 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00597841000msufc0074.fits
SUN_POSTN:        39.43d {+02h 37m 44s}  +15.40d {+15d 23' 46"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.26d {+05h 13m 02s}  +18.87d {+18d 52' 04"}
MOON_DIST:        93.21 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.02, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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:     Fri 02 May 14 08:36:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.156d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 13"} (J2000)
ROLL:            86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30695.47 SOD {08:31:35.47} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     420712307
X_OFFSET:        788 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       948
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00597841000msuni0086.fits
SUN_POSTN:        39.44d {+02h 37m 45s}  +15.40d {+15d 23' 46"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.27d {+05h 13m 04s}  +18.87d {+18d 52' 05"}
MOON_DIST:        93.21 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.02, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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:     Fri 02 May 14 08:36:17 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     597841,   Seg_Num: 0
GRB_RA:          319.1877d {+21h 16m 45.04s} (J2000),
                 319.3114d {+21h 17m 14.74s} (current),
                 318.7564d {+21h 15m 01.53s} (1950)
GRB_DEC:         +48.9702d {+48d 58' 12.7"} (J2000),
                 +49.0306d {+49d 01' 50.3"} (current),
                 +48.7602d {+48d 45' 36.6"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30714.00 SOD {08:31:54.00} UT,   93.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        39.44d {+02h 37m 45s}  +15.40d {+15d 23' 46"}
SUN_DIST:         72.01 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.27d {+05h 13m 04s}  +18.87d {+18d 52' 05"}
MOON_DIST:        93.22 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.00, -0.12 [deg] galactic lon,lat of the burst
ECL_COORDS:      349.33, 59.63 [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:     Fri 02 May 14 08:36:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.156d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 13"} (J2000)
ROLL:            86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30695.47 SOD {08:31:35.47} UT,   75.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     420712307
X_OFFSET:        788 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       948
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00597841000msuni0086.fits
SUN_POSTN:        39.44d {+02h 37m 45s}  +15.40d {+15d 23' 46"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.27d {+05h 13m 04s}  +18.87d {+18d 52' 05"}
MOON_DIST:        93.21 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.02, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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 #16202
C. A. Swenson (PSU), S. D. Barthelmy (GSFC), M. M. Chester (PSU) and P. A. Evans (U Leicester) report on behalf of the Swift Team:
At 08:30:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140502A (trigger=597841). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 319.155, +49.018 which is
```
   RA(J2000)  =  21h 16m 37s
   Dec(J2000) = +49d 01' 04"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 25 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 08:31:31.3 UT, 70.8 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 319.18744, 48.97012 which is equivalent to:
```
   RA(J2000)  = 21h 16m 44.99s
   Dec(J2000) = +48d 58' 12.4"
```
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 188 arcseconds from the BAT onboard position, outside 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 consistent with the Galactic value of 9.47 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 74 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 large, but uncertain extinction expected.
Burst Advocate for this burst is C. A. Swenson (cswenson AT astro.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 02 May 14 08:56:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.158d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
POINT_ROLL:      86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30907.64 SOD {08:35:07.64} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.493
N_STARS:         190
X_OFFSET:        229 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1668 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00597841000msufc0287.fits
SUN_POSTN:        39.45d {+02h 37m 48s}  +15.40d {+15d 24' 01"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.45d {+05h 13m 48s}  +18.87d {+18d 52' 20"}
MOON_DIST:        93.31 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 02 May 14 08:57:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.158d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
POINT_ROLL:      86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30907.64 SOD {08:35:07.64} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.493
N_STARS:         190
X_OFFSET:        229 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1668 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00597841000msufc0287.fits
SUN_POSTN:        39.45d {+02h 37m 48s}  +15.40d {+15d 24' 02"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.46d {+05h 13m 50s}  +18.87d {+18d 52' 20"}
MOON_DIST:        93.31 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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:     Fri 02 May 14 08:57:33 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     597841,   Seg_Num: 0
GRB_RA:          319.1875d {+21h 16m 45.00s} (J2000),
                 319.3112d {+21h 17m 14.69s} (current),
                 318.7562d {+21h 15m 01.49s} (1950)
GRB_DEC:         +48.9701d {+48d 58' 12.3"} (J2000),
                 +49.0305d {+49d 01' 49.9"} (current),
                 +48.7601d {+48d 45' 36.2"} (1950)
GRB_ERROR:       2.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30714.00 SOD {08:31:54.00} UT,   93.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        39.45d {+02h 37m 48s}  +15.40d {+15d 24' 02"}
SUN_DIST:         72.01 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.46d {+05h 13m 51s}  +18.87d {+18d 52' 21"}
MOON_DIST:        93.32 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.00, -0.12 [deg] galactic lon,lat of the burst
ECL_COORDS:      349.33, 59.63 [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:     Fri 02 May 14 08:57:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.158d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
ROLL:            86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30907.64 SOD {08:35:07.64} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     420712519
X_OFFSET:        788 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       948
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00597841000msuni0299.fits
SUN_POSTN:        39.45d {+02h 37m 48s}  +15.40d {+15d 24' 02"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.47d {+05h 13m 52s}  +18.87d {+18d 52' 21"}
MOON_DIST:        93.31 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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:     Fri 02 May 14 08:58:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.158d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
ROLL:            86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  30907.64 SOD {08:35:07.64} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     420712519
X_OFFSET:        788 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       948
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00597841000msuni0299.fits
SUN_POSTN:        39.45d {+02h 37m 48s}  +15.40d {+15d 24' 03"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.47d {+05h 13m 52s}  +18.87d {+18d 52' 21"}
MOON_DIST:        93.31 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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:     Fri 02 May 14 08:59:08 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.157d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
POINT_ROLL:      86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  31487.63 SOD {08:44:47.63} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.271
N_STARS:         190
X_OFFSET:        229 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1668 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00597841000msufc0867.fits
SUN_POSTN:        39.45d {+02h 37m 48s}  +15.40d {+15d 24' 03"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.48d {+05h 13m 54s}  +18.87d {+18d 52' 22"}
MOON_DIST:        93.32 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 02 May 14 08:59:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.157d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
POINT_ROLL:      86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  31487.63 SOD {08:44:47.63} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.271
N_STARS:         190
X_OFFSET:        229 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1668 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00597841000msufc0867.fits
SUN_POSTN:        39.45d {+02h 37m 48s}  +15.40d {+15d 24' 03"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.48d {+05h 13m 55s}  +18.87d {+18d 52' 22"}
MOON_DIST:        93.32 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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:     Fri 02 May 14 09:01:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.157d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
ROLL:            86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  31487.63 SOD {08:44:47.63} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     420713099
X_OFFSET:        788 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       948
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00597841000msuni0879.fits
SUN_POSTN:        39.45d {+02h 37m 49s}  +15.40d {+15d 24' 05"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.50d {+05h 14m 00s}  +18.87d {+18d 52' 23"}
MOON_DIST:        93.33 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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:     Fri 02 May 14 09:01:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     597841,   Seg_Num: 0
POINT_RA:        319.157d {+21h 16m 38s} (J2000)
POINT_DEC:       +49.020d {+49d 01' 12"} (J2000)
ROLL:            86.901d
IMG_START_DATE:  16779 TJD;   122 DOY;   14/05/02
IMG_START_TIME:  31487.63 SOD {08:44:47.63} UT,   867.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     420713099
X_OFFSET:        788 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       948
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00597841000msuni0879.fits
SUN_POSTN:        39.45d {+02h 37m 49s}  +15.40d {+15d 24' 05"}
SUN_DIST:         72.03 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       78.50d {+05h 14m 00s}  +18.87d {+18d 52' 24"}
MOON_DIST:        93.33 [deg]
MOON_ILLUM:      10 [%]
GAL_COORDS:       91.03, -0.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      349.36, 59.68 [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 #16203
Hoi-Fung Yu (MPE) reports on behalf of the Fermi GBM Team:
"At 08:30:20.11 UT on 02 May 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140502A (trigger 420712223 / 140502354), which was also detected by Swift/BAT and XRT (Swenson et al. 2014, GCN 16202). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 64 degrees.
The GBM light curve consists of a single pulse with a duration (T90) of about 20 s (50-300 keV). The time-averaged spectrum from T0-2.048 s to T0+6.144 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.7 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 298 +/- 71 keV.
The event fluence (10-1000 keV) in this time interval is (1.6 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.448 s in the 10-1000 keV band is 1.6 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16206
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1615 s of XRT Photon Counting mode data and 3 UVOT images for GRB 140502A, 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 = 319.18818, +48.97021 which is equivalent to:
```
RA (J2000): 21h 16m 45.16s
Dec (J2000): +48d 58' 12.7"
```
with an uncertainty of 2.0 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 #16207
D.N. Burrows (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), B. Sbarufatti (INAF-OAB/PSU), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), J.A. Kennea (PSU), V. Mangano (PSU) and C.A. Swenson report on behalf of the Swift-XRT team:
We have analysed 6.3 ks of XRT data for GRB 140502A (Swenson et al. GCN Circ. 16202), from 84 s to 17.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 16206).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.85 (+0.23, -0.17).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.7 (+0.8, -0.6). The best-fitting absorption column is 2.2 (+1.4, -1.1) x 10^22 cm^-2, in excess of the Galactic value of 9.5 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 7.0 x 10^-11 (1.3 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.2 (+1.4, -1.1) x 10^22 cm^-2
Galactic foreground: 9.5 x 10^21 cm^-2
Excess significance: 1.8 sigma
Photon index:	     1.7 (+0.8, -0.6)
```
If the light curve continues to decay with a power-law decay index of 0.85, the count rate at T+24 hours will be 7.5 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.3 x 10^-14 (9.5 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00597841.
This circular is an official product of the Swift-XRT team.
GCN Circular #16208
A. Y. Lien (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), C. A. Swenson (PSU), M. Stamatikos (OSU), 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 140502A (trigger #597841) (Swenson, et al., GCN Circ. 16202). The BAT ground-calculated position is RA, Dec = 319.172, 48.975 deg, which is
```
   RA(J2000)  =  21h 16m 41.3s 
   Dec(J2000) = +48d 58' 28.2" 
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%.
The mask-weighted light curve shows a FRED-shaped peak starting at ~T-3 sec, peaking at ~T+2 sec, and ending at ~T+20 sec. T90 (15-350 keV) is 16.9 +- 1.9 sec (estimated error including systematics).
The time-averaged spectrum from T-1.66 to T+17.39 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.22 +- 0.13. The fluence in the 15-150 keV band is 6.7 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.44 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/597841/BA/
GCN Circular #16209
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME collaboration:
We observed the field of GRB 140502A (Swenson et al., GCNC 16202) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2014-05-02 16:48:47 UT (~8.3 h after the burst). We did not find any new point source within the enhanced XRT circle (Goad et al., GCNC 16206) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.38783    17:48:49    6180.0   >19.5  >19.2  >18.5
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #16210
S. R. Oates (IAA-CSIC,UCL-MSSL) and C. A. Swenson (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140502A 75 s after the BAT trigger (Swenson et al., GCN Circ. 16202). Two bright USNO-B1 sources lie close to the XRT location, with R magnitudes of 13.48 and 13.61, lie within 3 and 9 arcseconds, respectively of the XRT position (Goad et al., GCN Circ. 16206). Neither of these sources are observed to vary significantly over the duration of the initial UVOT observations.
Ppreliminary 3-sigma upper limits, using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are :
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            75          225          147         >16.0
u_FC               287          537          246         >16.3
white               75         5702          525         >16.0
v                  616         6113          432         >15.0
b                  543        11919          337         >16.0
u                  287        11811         1347         >16.3
w1                 666        17270         1642         >17.9
m2                4681        16734         1262         >20.0
w2                 593         5908          432         >18.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 2.97 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16221
L. Elenin (KIAM), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed of the field of Swift GRB GRB 140502A with 0.4-m telescope of ISON-NM observatory starting on May, 02 (UT) 08:31:32, i.e. 72 s after BAT trigger (Swenson et al., GCN 16202). We took series of unfiltered images of 30 s - 60 s exposures. A bright star (USNO-B1.0 1389-0392112) already mentioned (Oates et al., GCN 16210) lies within enhanced XRT error circle (Goad et al., GCN 16206). We investigate variability of a possible OT in presence in near vicinity of the bright star. The upper limit of possible variation of the OT is 16.6m within any of 60 s interval of our observations between (UT) 08:31:32 and 09:24:25 which can be considered as an upper limit on the OT associated with GRB 140502A.
Formal photometry and limiting magnitude of point-like source in the observed field is following
```
UT start   t-T0        Exp.    Filter   OT   UL(3 sigma)
           (mid.,days)  (s)
08:31:32  0.00383      10*30   None     n/d  18.8
```
and based on nearby USNO-B1.0 stars, R2 magnitudes.
GCN Report 472.1
GCN_Report 472.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_472_1.pdf by C.A. Swenson at PSU titled: "Swift Observations of GRB 140502A"

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Jochen Greiner, last update: 28-Jul-2014 [Disclaimer]