Gamma-ray Burst 140506A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:15:21 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     598284,   Seg_Num: 0
GRB_RA:          276.790d {+18h 27m 10s} (J2000),
                 277.089d {+18h 28m 21s} (current),
                 275.746d {+18h 22m 59s} (1950)
GRB_DEC:         -55.562d {-55d 33' 43"} (J2000),
                 -55.552d {-55d 33' 08"} (current),
                 -55.592d {-55d 35' 32"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5161 [cnts]    Image_Peak=239 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   158     E_range: 50-350 keV
BKG_INTEN:       20650 [cnts]
BKG_TIME:        76044.02 SOD {21:07:24.02} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16783 TJD;   126 DOY;   14/05/06
GRB_TIME:        76056.82 SOD {21:07:36.82} UT
GRB_PHI:          14.24 [deg]
GRB_THETA:        51.11 [deg]
SOLN_STATUS:     0x20000403
RATE_SIGNIF:     41.44 [sigma]
IMAGE_SIGNIF:    12.41 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +2  +0  +0 +56  +0 
SUN_POSTN:        43.79d {+02h 55m 11s}  +16.70d {+16d 42' 02"}
SUN_DIST:        124.11 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.50d {+08h 57m 59s}  +11.88d {+11d 53' 03"}
MOON_DIST:       127.55 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.38,-18.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      274.53,-32.23 [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 = 78.53,18.87 [deg].  
COMMENTS:           
COMMENTS:        This trigger occured while the StarTracker had lost lock, so it is possibly bogus.  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=421103259).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 06 May 14 21:08:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     421103259
GRB_RA:          269.367d {+17h 57m 28s} (J2000),
                 269.667d {+17h 58m 40s} (current),
                 268.322d {+17h 53m 17s} (1950)
GRB_DEC:         -55.467d {-55d 28' 00"} (J2000),
                 -55.467d {-55d 28' 02"} (current),
                 -55.461d {-55d 27' 39"} (1950)
GRB_ERROR:       6.57 [deg radius, statistical plus systematic]
GRB_INTEN:       565 [cnts/sec]
DATA_SIGNIF:     18.30 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16783 TJD;   126 DOY;   14/05/06
GRB_TIME:        76056.88 SOD {21:07:36.88} UT
GRB_PHI:          35.00 [deg]
GRB_THETA:       145.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.80
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        43.79d {+02h 55m 10s}  +16.70d {+16d 41' 57"}
SUN_DIST:        127.93 [deg]   Sun_angle= 8.9 [hr] (West of Sun)
MOON_POSTN:      134.44d {+08h 57m 45s}  +11.90d {+11d 53' 59"}
MOON_DIST:       124.31 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      337.72,-14.95 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      269.58,-32.03 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140506880/quicklook/glg_lc_medres34_bn140506880.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 228.48,-21.97 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 06 May 14 21:08:30 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     421103259
GRB_RA:          276.280d {+18h 25m 07s} (J2000),
                 276.587d {+18h 26m 21s} (current),
                 275.210d {+18h 20m 50s} (1950)
GRB_DEC:         -57.140d {-57d 08' 23"} (J2000),
                 -57.131d {-57d 07' 51"} (current),
                 -57.168d {-57d 10' 03"} (1950)
GRB_ERROR:       2.94 [deg radius, statistical only]
DATA_SIGNIF:     25.50 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16783 TJD;   126 DOY;   14/05/06
GRB_TIME:        76056.88 SOD {21:07:36.88} UT
GRB_PHI:          33.00 [deg]
GRB_THETA:       141.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:        43.79d {+02h 55m 10s}  +16.70d {+16d 41' 57"}
SUN_DIST:        123.76 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN:      134.44d {+08h 57m 46s}  +11.90d {+11d 53' 55"}
MOON_DIST:       126.33 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      337.72,-19.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      274.10,-33.79 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140506880/quicklook/glg_lc_medres34_bn140506880.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:16:02 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     598284,   Seg_Num: 0
GRB_RA:          276.7752d {+18h 27m 06.04s} (J2000),
                 277.0749d {+18h 28m 17.97s} (current),
                 275.7297d {+18h 22m 55.13s} (1950)
GRB_DEC:         -55.6353d {-55d 38' 07.0"} (J2000),
                 -55.6257d {-55d 37' 32.4"} (current),
                 -55.6656d {-55d 39' 56.2"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.01e-08 [erg/cm2/sec]
GRB_SIGNIF:      13.74 [sigma]
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76154.70 SOD {21:09:14.70} UT,   97.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.70 237.20 261.60 243.81
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 03"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.50d {+08h 58m 00s}  +11.88d {+11d 52' 58"}
MOON_DIST:       127.50 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.31,-18.85 [deg] galactic lon,lat of the burst
ECL_COORDS:      274.52,-32.30 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 4.42 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:16:19 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     598284,   Seg_Num: 0
GRB_RA:          276.7752d {+18h 27m 06.0s} (J2000),
                 277.0749d {+18h 28m 17.9s} (current),
                 275.7297d {+18h 22m 55.1s} (1950)
GRB_DEC:         -55.6353d {-55d 38' 07.0"} (J2000),
                 -55.6257d {-55d 37' 32.4"} (current),
                 -55.6656d {-55d 39' 56.2"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       189 [cnts]
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76154.70 SOD {21:09:14.70} UT,   97.9 [sec] since BAT Trigger Time
CENTROID_X:      302.40,  raw= 302  [pixels]
CENTROID_Y:      323.90,  raw= 324  [pixels]
ROLL:            112.26 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   61.53
GRB_POS_XRT_Z:   -6.82
IMAGE_URL:       sw00598284000msxps_rw.img
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 03"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.50d {+08h 58m 01s}  +11.88d {+11d 52' 56"}
MOON_DIST:       127.49 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.31,-18.85 [deg] galactic lon,lat of the burst
ECL_COORDS:      274.52,-32.30 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:16:13 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     598284,   Seg_Num: 0
GRB_RA:          276.7752d {+18h 27m 06.0s} (J2000),
                 277.0749d {+18h 28m 17.9s} (current),
                 275.7297d {+18h 22m 55.1s} (1950)
GRB_DEC:         -55.6353d {-55d 38' 07.0"} (J2000),
                 -55.6257d {-55d 37' 32.4"} (current),
                 -55.6656d {-55d 39' 56.2"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       189 [cnts]
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76154.70 SOD {21:09:14.70} UT,   97.9 [sec] since BAT Trigger Time
CENTROID_X:      302.40,  raw= 302  [pixels]
CENTROID_Y:      323.90,  raw= 324  [pixels]
ROLL:            112.26 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   61.53
GRB_POS_XRT_Z:   -6.82
IMAGE_URL:       sw00598284000msxps_rw.img
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 03"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.50d {+08h 58m 01s}  +11.88d {+11d 52' 57"}
MOON_DIST:       127.50 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.31,-18.85 [deg] galactic lon,lat of the burst
ECL_COORDS:      274.52,-32.30 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:16:55 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     598284,   Seg_Num: 0
GRB_RA:          276.790d {+18h 27m 10s} (J2000),
                 277.089d {+18h 28m 21s} (current),
                 275.746d {+18h 22m 59s} (1950)
GRB_DEC:         -55.562d {-55d 33' 43"} (J2000),
                 -55.552d {-55d 33' 08"} (current),
                 -55.592d {-55d 35' 32"} (1950)
GRB_DATE:        16783 TJD;   126 DOY;   14/05/06
GRB_TIME:        76056.82 SOD {21:07:36.82} UT
TRIGGER_INDEX:   158
GRB_PHI:          14.24 [deg]
GRB_THETA:        51.11 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x403
RATE_SIGNIF:     41.44 [sigma]
IMAGE_SIGNIF:    12.41 [sigma]
LC_URL:          sw00598284000msb.lc
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 03"}
SUN_DIST:        124.11 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.51d {+08h 58m 02s}  +11.88d {+11d 52' 51"}
MOON_DIST:       127.55 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.38,-18.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      274.53,-32.23 [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 = 78.53,18.87 [deg].  
COMMENTS:           
COMMENTS:        This trigger occured while the StarTracker had lost lock, so it is possibly bogus.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:17:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.651d {-55d 39' 03"} (J2000)
ROLL:            112.259d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76164.40 SOD {21:09:24.40} UT,   107.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     421103376
X_OFFSET:        756 [pixels]
Y_OFFSET:        768 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       928
BINNING_INDEX:   1
IM_URL:          sw00598284000msuni0119.fits
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 04"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.52d {+08h 58m 04s}  +11.88d {+11d 52' 43"}
MOON_DIST:       127.47 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:17:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.651d {-55d 39' 03"} (J2000)
POINT_ROLL:      112.259d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76164.40 SOD {21:09:24.40} UT,   107.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.319
N_STARS:         190
X_OFFSET:        64 [pixels]
Y_OFFSET:        72 [pixels]
X_MAX:           1023 [pixels]
Y_MAX:           1031 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    6
SL_URL:          sw00598284000msufc0107.fits
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 04"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.51d {+08h 58m 04s}  +11.88d {+11d 52' 45"}
MOON_DIST:       127.47 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:17:08 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.651d {-55d 39' 03"} (J2000)
POINT_ROLL:      112.259d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76164.40 SOD {21:09:24.40} UT,   107.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.319
N_STARS:         190
X_OFFSET:        64 [pixels]
Y_OFFSET:        72 [pixels]
X_MAX:           1023 [pixels]
Y_MAX:           1031 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    6
SL_URL:          sw00598284000msufc0107.fits
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 03"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.51d {+08h 58m 02s}  +11.88d {+11d 52' 50"}
MOON_DIST:       127.47 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:17:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.651d {-55d 39' 03"} (J2000)
ROLL:            112.259d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76164.40 SOD {21:09:24.40} UT,   107.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     421103376
X_OFFSET:        756 [pixels]
Y_OFFSET:        768 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       928
BINNING_INDEX:   1
IM_URL:          sw00598284000msuni0119.fits
SUN_POSTN:        43.80d {+02h 55m 11s}  +16.70d {+16d 42' 04"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.51d {+08h 58m 03s}  +11.88d {+11d 52' 46"}
MOON_DIST:       127.47 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:20:13 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     598284,   Seg_Num: 0
GRB_RA:          276.7750d {+18h 27m 05.99s} (J2000),
                 277.0747d {+18h 28m 17.93s} (current),
                 275.7295d {+18h 22m 55.08s} (1950)
GRB_DEC:         -55.6357d {-55d 38' 08.5"} (J2000),
                 -55.6261d {-55d 37' 33.8"} (current),
                 -55.6660d {-55d 39' 57.6"} (1950)
GRB_ERROR:       1.1 [arcsec radius, statistical only]
GRB_MAG:         17.29 +/- 0.40 [mag]
FILTER:          10, White
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76163.00 SOD {21:09:23.00} UT,   106.2 [sec] since BAT Trigger Time
SUN_POSTN:        43.80d {+02h 55m 12s}  +16.70d {+16d 42' 06"}
SUN_DIST:        124.09 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.54d {+08h 58m 08s}  +11.87d {+11d 52' 26"}
MOON_DIST:       127.47 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.31,-18.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      274.52,-32.30 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 1.1 arcsec from the XRT position.  
COMMENTS:        Result based on srclist data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:22:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
POINT_ROLL:      112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76377.61 SOD {21:12:57.61} UT,   320.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.770
N_STARS:         178
X_OFFSET:        436 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00598284000msufc0320.fits
SUN_POSTN:        43.80d {+02h 55m 12s}  +16.70d {+16d 42' 07"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.56d {+08h 58m 13s}  +11.87d {+11d 52' 07"}
MOON_DIST:       127.45 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:22:31 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
POINT_ROLL:      112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76377.61 SOD {21:12:57.61} UT,   320.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.770
N_STARS:         178
X_OFFSET:        436 [pixels]
Y_OFFSET:        448 [pixels]
X_MAX:           1395 [pixels]
Y_MAX:           1407 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00598284000msufc0320.fits
SUN_POSTN:        43.80d {+02h 55m 12s}  +16.70d {+16d 42' 07"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.55d {+08h 58m 13s}  +11.87d {+11d 52' 09"}
MOON_DIST:       127.45 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:23:30 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
ROLL:            112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76377.61 SOD {21:12:57.61} UT,   320.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     421103589
X_OFFSET:        756 [pixels]
Y_OFFSET:        768 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       928
BINNING_INDEX:   1
IM_URL:          sw00598284000msuni0332.fits
SUN_POSTN:        43.80d {+02h 55m 12s}  +16.70d {+16d 42' 08"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.56d {+08h 58m 15s}  +11.87d {+11d 52' 01"}
MOON_DIST:       127.44 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:23:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
ROLL:            112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76377.61 SOD {21:12:57.61} UT,   320.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     421103589
X_OFFSET:        756 [pixels]
Y_OFFSET:        768 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       916
Y_GRB_POS:       928
BINNING_INDEX:   1
IM_URL:          sw00598284000msuni0332.fits
SUN_POSTN:        43.80d {+02h 55m 12s}  +16.70d {+16d 42' 08"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.56d {+08h 58m 15s}  +11.87d {+11d 51' 60"}
MOON_DIST:       127.44 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #16214
B.P. Gompertz (U Leicester), D. N. Burrows (PSU), S. B. Cenko (GSFC), S. T. Holland (Eureka), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (NASA/GSFC/ORAU), V. Mangano (PSU), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 21:07:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140506A (trigger=598284). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 276.790, -55.562 which is
```
   RA(J2000) = 18h 27m 10s
   Dec(J2000) = -55d 33' 43"
```
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 10 sec. The peak count rate was ~6500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 21:09:14.7 UT, 97.9 seconds after the BAT trigger. XRT found a bright, fading, uncatalogued X-ray source located at RA, Dec 276.7752, -55.6353 which is equivalent to:
```
   RA(J2000)  = +18h 27m 6.05s
   Dec(J2000) = -55d 38' 07.1"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 265 arcseconds from the BAT onboard position. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 1.01e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 320 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	18:27:06.03 = 276.77513
  DEC(J2000) = -55:38:08.8  = -55.63577
```
with a 90%-confidence error radius of about 0.63 arc sec. This position is 1.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.46 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is B.P. Gompertz (bpg6 AT 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:     Tue 06 May 14 21:29:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
POINT_ROLL:      112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76932.83 SOD {21:22:12.83} UT,   876.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.277
N_STARS:         190
X_OFFSET:        196 [pixels]
Y_OFFSET:        208 [pixels]
X_MAX:           1635 [pixels]
Y_MAX:           1647 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00598284000msufc0876.fits
SUN_POSTN:        43.80d {+02h 55m 13s}  +16.70d {+16d 42' 12"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.61d {+08h 58m 27s}  +11.85d {+11d 51' 15"}
MOON_DIST:       127.41 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:30:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
POINT_ROLL:      112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76932.83 SOD {21:22:12.83} UT,   876.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.277
N_STARS:         190
X_OFFSET:        196 [pixels]
Y_OFFSET:        208 [pixels]
X_MAX:           1635 [pixels]
Y_MAX:           1647 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00598284000msufc0876.fits
SUN_POSTN:        43.80d {+02h 55m 13s}  +16.70d {+16d 42' 12"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.61d {+08h 58m 28s}  +11.85d {+11d 51' 12"}
MOON_DIST:       127.41 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 06 May 14 21:31:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
ROLL:            112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76932.83 SOD {21:22:12.83} UT,   876.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     421104144
X_OFFSET:        755 [pixels]
Y_OFFSET:        767 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       915
Y_GRB_POS:       927
BINNING_INDEX:   1
IM_URL:          sw00598284000msuni0888.fits
SUN_POSTN:        43.81d {+02h 55m 13s}  +16.70d {+16d 42' 13"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.62d {+08h 58m 30s}  +11.85d {+11d 51' 03"}
MOON_DIST:       127.40 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [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:     Tue 06 May 14 21:31:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     598284,   Seg_Num: 0
POINT_RA:        276.761d {+18h 27m 03s} (J2000)
POINT_DEC:       -55.649d {-55d 38' 55"} (J2000)
ROLL:            112.257d
IMG_START_DATE:  16783 TJD;   126 DOY;   14/05/06
IMG_START_TIME:  76932.83 SOD {21:22:12.83} UT,   876.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     421104144
X_OFFSET:        755 [pixels]
Y_OFFSET:        767 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       915
Y_GRB_POS:       927
BINNING_INDEX:   1
IM_URL:          sw00598284000msuni0888.fits
SUN_POSTN:        43.81d {+02h 55m 13s}  +16.70d {+16d 42' 13"}
SUN_DIST:        124.10 [deg]   Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN:      134.63d {+08h 58m 30s}  +11.85d {+11d 51' 01"}
MOON_DIST:       127.40 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      339.29,-18.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.51,-32.32 [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 #16215
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 930 s of XRT Photon Counting mode data and 1 UVOT images for GRB 140506A, 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 = 276.77549, -55.63648 which is equivalent to:
```
RA (J2000): 18h 27m 6.12s
Dec (J2000): -55d 38' 11.3"
```
with an uncertainty of 1.4 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 #16216
K.L. Page, P.A. Evans and B.P. Gompertz (U Leicester) report on behalf of the Swift-XRT team:
We have analysed 7.7 ks of XRT data for GRB 140506A (Gompertz et al. GCN Circ. 16214), from 87 s to 30.4 ks after the BAT trigger. The data comprise 531 s in Windowed Timing (WT) mode (the first 9 s were 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. 16215).
The late-time light curve (from T0+5.1 ks) can be modelled with a power-law decay with a decay index of alpha=0.91 (+/-0.08).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.65 (+/-0.03). The best-fitting absorption column is 3.14 (+/-0.10) x 10^21 cm^-2, in excess of the Galactic value of 1.1 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.79 (+/-0.09) and a best-fitting absorption column of 2.9 (+/-0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.9 (+/-0.4) x 10^21 cm^-2
Galactic foreground: 1.1 x 10^21 cm^-2
Excess significance: 7.6 sigma
Photon index:	     1.79 (+/-0.09)
```
If the light curve continues to decay with a power-law decay index of 0.91, the count rate at T+24 hours will be 0.058 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.4 x 10^-12 (3.2 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/00598284.
This circular is an official product of the Swift-XRT team.
GCN Circular #16217
J. P. U. Fynbo (DARK/NBI), N. R. Tanvir (U. Leicester), P. Jakobsson (U. Iceland), D. Xu, D. Malesani, B. Milvang-Jensen (DARK/NBI) report on behalf of the X-shooter GRB collaboration:
We observed the optical afterglow of GRB 140506A (Gompertz et al., GCN 16214) with the VLT/X-shooter spectrograph, equipped with the UVB/VIS/NIR arms and covering the wavelength range 3000-25000 AA.
From the first acquisition image at May 7.21 UT, the afterglow has m(R)=20.9 +/- 0.2 mag against the USNO-B1 (R2) catalog.
The spectra (8 x 600 s) started at May 7.21 UT and ended May 7.28 UT, and the mean time is May 7.24 UT (8.77 hr after the GRB). We detect absorption features in the UVB/VIS arms, interpreted as due to Mg II 2796, 2803, He I 3889, and Ca II H+K, at a common redshift of z = 0.889, which is treated as the tentative redshift of the GRB's host galaxy. The combined spectrum is very red with very weak signal in the UVB arm, possibly due to the large host extinction.
We acknowledge excellent support from the observing staff at Paranal, in particular Valentin D. Ivanov and Yazan Momany.
GCN Circular #16218
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), B.P. Gompertz (U Leicester), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 140506A (trigger #598284) (Gompertz, et al., GCN Circ. 16214). The BAT ground-calculated position is RA, Dec = 276.806, -55.556 deg, which is
```
   RA(J2000)  =  18h 27m 13.5s 
   Dec(J2000) = -55d 33' 20.2" 
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 11%.
The mask-weighted light curve a bright initial pulse strting at ~T-5 sec, peaking at ~T+0.2 sec, and returning to baseline at ~T+5 sec. Then there were two weaker peaks at ~T+60 sec and at ~T+110 sec. T90 (15-350 keV) is 111.1 +- 9.6 sec (estimated error including systematics).
The time-averaged spectrum from T-0.20 to T+120.18 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.68 +- 0.16. The fluence in the 15-150 keV band is 2.8 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.00 sec in the 15-150 keV band is 10.9 +- 0.9 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/598284/BA/

GCN Circular #16219
M. H. Siegel (PSU) and B. P. Gompertz (U Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140506A 108 s after the BAT trigger (Gompertz et al., GCN Circ. 16214). A source consistent with the XRT position (Osborne et al. GCN Circ. 16215) is detected in the initial UVOT exposures.
The preliminary UVOT position is:

  RA  (J2000) =  18:27:06.04 = 276.77516 (deg.)
  Dec (J2000) = -55:38:08.7  = -55.63575 (deg.)

with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first and second orbits are:

Filter         T_start(s)   T_stop(s)      Exp(s)       Mag

white (fc)         108          257          147     17.19+-0.03
white              108         1545          390     17.82+-0.05
white             6078         6278          196     20.07+-0.14
white            11748        12655          885     21.52+-0.26
v                  650         1576           98    >18.87
v                 5053         6688          393     19.82+-0.32
b                  576         1520           97     19.40+-0.30
b                 5873         7334          221    >20.57
u (fc)             320          570          245     17.34+-0.07
u                  320         1496          323     17.50+-0.07
u                 5668         7303          393     20.04+-0.34
uvw1               700         1471           77     18.60+-0.29
uvw1              5463         7098          393    >20.29
uvm2               675         1446           97    >18.96
uvm2              5257         6893          393    >20.17
uvw2               626         1570          116    >19.41
uvw2              6284         6484          196    >19.97

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #16220
P. Jenke (UAH) reports on behalf of the Fermi GBM Team:
"At 21:07:36.88 UT on May 6 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140506A (trigger 421103259/140506880), which was also detected by Swift (B.P. Gompertz et al. 2014, GCN 16214). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift/XRT location.
The angle of the burst direction to the Fermi LAT boresight is 135 degrees.
The GBM light curve consists of one main peak near T0 and a late, smaller peak at ~T0+60 s with a duration (T90) of about 64 s (50-300 keV). The time-averaged spectrum from T0-1.9 s to T0+2.2s is well fit by a Band function with an Epeak of 141 +/- 36 keV, alpha = -0.9 +/- 0.2 and beta = -2.0 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is (3.5 +/- 0.2)E-06 erg/cm^2. The 1.0-sec peak photon flux measured starting from T0 in the 10-1000 keV band is 14.2 +/- 0.7 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16223
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lyssenko, and T. Cline on behalf of the Konus-Wind team, report:
A long-duration GRB 140506A (Swift-BAT trigger 598284: Gompertz et al., GCN 16214; Markwardt et al., GCN 16218; Fermi-GBM detection: Jenke, GCN 16220) triggered Konus-Wind at T0=76059.098 s UT (21:07:39.098).
The light curve shows two bursting episodes: a narrow, double-peaked pulse from ~T0-1.1 s to ~T0+1.6 s, followed by a broad, weak, soft pulse from ~T0+49 s to ~T0+63 s A total duration of the burst is ~64 s. The emission is seen up to ~7 MeV.
As observed by Konus-Wind, the burst had a fluence of 6.6(-1.6,+1.8)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.640 s, of 6.2(-1.9,+2.5)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the first bursting episode (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 18 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -1.3 (-0.2,+0.3), the high energy photon index beta = -2.3 (-7.7,+0.4), the peak energy Ep = 187 (-59,+90) keV, chi2 = 94/97 dof.
The time-averaged spectrum of the second bursting episode (measured from T0+49.408 to T0+65.792 s) is best fit in the 20 keV - 18 MeV range by a simple power-law function with the photon index 2.06(-0.13,+0.14), chi2 = 98/98 dof.
Assuming the redshift z=0.889 (Fynbo et al., GCN 16217) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~1.4x10^52 erg, the peak luminosity L_iso is ~2.5x10^52 erg/s, and the rest-frame peak energy, Ep,i, is ~350 keV (as derived from the spectrum of the first episode).
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140506_T76059/
All the quoted errors are at the 1 sigma confidence level. All the quoted values are preliminary.
1409.4975 from 18 Sep 14
J. P. U. Fynbo et al.: The mysterious optical afterglow spectrum of GRB140506A at z=0.889
Context. Gamma-ray burst (GRBs) afterglows probe sightlines to star-forming regions in distant star-forming galaxies. Here we present a study of the peculiar afterglow spectrum of the z = 0.889 GRB 140506A. Aims. Our aim is to understand the origin of the very unusual properties of the absorption along the line-of-sight.
Methods. We analyse spectroscopic observations obtained with the X-shooter spectrograph mounted on the ESO/VLT at two epochs 8.8 h and 33 h after the burst as well as imaging from the GROND instrument. We also present imaging and spectroscopy of the host galaxy obtained with the Magellan telescope.
Results. The underlying afterglow appears to be a typical afterglow of a long-duration GRB. However, the material along the line-of- sight has imprinted very unusual features on the spectrum. Firstly, there is a very broad and strong flux drop below 8000 AA (4000 AA in the rest frame), which seems to be variable between the two spectroscopic epochs. We can reproduce the flux-drops both as a giant 2175 AA extinction bump and as an effect of multiple scattering on dust grains in a dense environment. Secondly, we detect absorption lines from excited H i and He i. We also detect molecular absorption from CH+ .
Conclusions. We interpret the unusual properties of these spectra as reflecting the presence of three distinct regions along the line-of-sight: the excited He i absorption originates from an H ii-region, whereas the Balmer absorption must originate from an associated photodissociation region. The strong metal line and molecular absorption and the dust extinction must originate from a third, cooler region along the line-of-sight. The presence of (at least) three separate regions is reflected in the fact that the different absorption components have different velocities relative to the systemic redshift of the host galaxy.

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Jochen Greiner, last update: 18-Sep-2014 [Disclaimer]