Gamma-ray Burst 140919A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 Sep 14 15:15:57 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     613160,   Seg_Num: 0
GRB_RA:          221.556d {+14h 46m 13s} (J2000),
                 221.779d {+14h 47m 07s} (current),
                 220.801d {+14h 43m 12s} (1950)
GRB_DEC:         -32.154d {-32d 09' 14"} (J2000),
                 -32.215d {-32d 12' 54"} (current),
                 -31.945d {-31d 56' 39"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       15737 [cnts]    Image_Peak=227 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   309     E_range: 50-350 keV
BKG_INTEN:       126976 [cnts]
BKG_TIME:        54859.45 SOD {15:14:19.45} UT
BKG_DUR:         40 [sec]
GRB_DATE:        16919 TJD;   262 DOY;   14/09/19
GRB_TIME:        54915.51 SOD {15:15:15.51} UT
GRB_PHI:         -97.47 [deg]
GRB_THETA:        37.95 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     20.46 [sigma]
IMAGE_SIGNIF:    7.04 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +3  -3  +0  +0 -58  +0 
SUN_POSTN:       176.89d {+11h 47m 33s}   +1.35d {+01d 20' 56"}
SUN_DIST:         54.08 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.13d {+08h 28m 32s}  +13.86d {+13d 51' 39"}
MOON_DIST:       101.20 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.52, 24.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.93,-15.36 [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 = 83.05,10.18 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=432832516).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 19 Sep 14 15:15:39 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     432832516
GRB_RA:          221.717d {+14h 46m 52s} (J2000),
                 221.947d {+14h 47m 47s} (current),
                 220.935d {+14h 43m 44s} (1950)
GRB_DEC:         -37.583d {-37d 34' 59"} (J2000),
                 -37.644d {-37d 38' 39"} (current),
                 -37.374d {-37d 22' 26"} (1950)
GRB_ERROR:       21.58 [deg radius, statistical plus systematic]
GRB_INTEN:       93 [cnts/sec]
DATA_SIGNIF:     6.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16919 TJD;   262 DOY;   14/09/19
GRB_TIME:        54913.54 SOD {15:15:13.54} UT
GRB_PHI:          35.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.69
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       1,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       176.89d {+11h 47m 32s}   +1.35d {+01d 20' 57"}
SUN_DIST:         56.99 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.13d {+08h 28m 32s}  +13.86d {+13d 51' 40"}
MOON_DIST:       102.17 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      326.93, 19.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      230.84,-20.48 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140919636/quicklook/glg_lc_medres34_bn140919636.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 66.87,-16.48 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 19 Sep 14 15:15:48 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     432832516
GRB_RA:          215.150d {+14h 20m 36s} (J2000),
                 215.367d {+14h 21m 28s} (current),
                 214.416d {+14h 17m 40s} (1950)
GRB_DEC:         -30.617d {-30d 37' 00"} (J2000),
                 -30.684d {-30d 41' 00"} (current),
                 -30.388d {-30d 23' 16"} (1950)
GRB_ERROR:       8.80 [deg radius, statistical plus systematic]
GRB_INTEN:       192 [cnts/sec]
DATA_SIGNIF:     20.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16919 TJD;   262 DOY;   14/09/19
GRB_TIME:        54913.54 SOD {15:15:13.54} UT
GRB_PHI:          23.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.52
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       176.89d {+11h 47m 33s}   +1.35d {+01d 20' 57"}
SUN_DIST:         48.62 [deg]   Sun_angle= -2.6 [hr] (East of Sun)
MOON_POSTN:      127.13d {+08h 28m 32s}  +13.86d {+13d 51' 40"}
MOON_DIST:        95.54 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      324.73, 28.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      223.04,-15.68 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140919636/quicklook/glg_lc_medres34_bn140919636.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 66.87,-16.48 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 19 Sep 14 15:16:31 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      67
TRIGGER_NUM:     432832516
GRB_RA:          220.980d {+14h 43m 55s} (J2000),
                 221.199d {+14h 44m 48s} (current),
                 220.237d {+14h 40m 57s} (1950)
GRB_DEC:         -29.600d {-29d 36' 00"} (J2000),
                 -29.662d {-29d 39' 41"} (current),
                 -29.389d {-29d 23' 18"} (1950)
GRB_ERROR:       4.22 [deg radius, statistical only]
DATA_SIGNIF:     21.40 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16919 TJD;   262 DOY;   14/09/19
GRB_TIME:        54913.54 SOD {15:15:13.54} UT
GRB_PHI:          21.00 [deg]
GRB_THETA:        35.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       176.89d {+11h 47m 33s}   +1.35d {+01d 20' 56"}
SUN_DIST:         52.41 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.14d {+08h 28m 33s}  +13.86d {+13d 51' 35"}
MOON_DIST:       100.27 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      330.37, 27.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      227.63,-13.08 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140919636/quicklook/glg_lc_medres34_bn140919636.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=613160).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 19 Sep 14 15:16:11 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     432832516
GRB_RA:          223.490d {+14h 53m 58s} (J2000),
                 223.716d {+14h 54m 52s} (current),
                 222.724d {+14h 50m 54s} (1950)
GRB_DEC:         -33.440d {-33d 26' 23"} (J2000),
                 -33.499d {-33d 29' 57"} (current),
                 -33.237d {-33d 14' 11"} (1950)
GRB_ERROR:       5.07 [deg radius, statistical only]
DATA_SIGNIF:     17.20 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16919 TJD;   262 DOY;   14/09/19
GRB_TIME:        54913.54 SOD {15:15:13.54} UT
GRB_PHI:          28.00 [deg]
GRB_THETA:        33.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       176.89d {+11h 47m 33s}   +1.35d {+01d 20' 56"}
SUN_DIST:         56.13 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      127.14d {+08h 28m 33s}  +13.86d {+13d 51' 37"}
MOON_DIST:       103.00 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      330.40, 22.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      230.94,-16.09 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140919636/quicklook/glg_lc_medres34_bn140919636.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=613160).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 Sep 14 15:18:42 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     613160,   Seg_Num: 0
GRB_RA:          221.556d {+14h 46m 13s} (J2000),
                 221.779d {+14h 47m 07s} (current),
                 220.801d {+14h 43m 12s} (1950)
GRB_DEC:         -32.154d {-32d 09' 14"} (J2000),
                 -32.215d {-32d 12' 54"} (current),
                 -31.945d {-31d 56' 39"} (1950)
GRB_DATE:        16919 TJD;   262 DOY;   14/09/19
GRB_TIME:        54915.51 SOD {15:15:15.51} UT
TRIGGER_INDEX:   309
GRB_PHI:         -97.47 [deg]
GRB_THETA:        37.95 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     20.46 [sigma]
IMAGE_SIGNIF:    7.04 [sigma]
LC_URL:          sw00613160000msb.lc
SUN_POSTN:       176.89d {+11h 47m 33s}   +1.35d {+01d 20' 54"}
SUN_DIST:         54.08 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.16d {+08h 28m 38s}  +13.86d {+13d 51' 21"}
MOON_DIST:       101.18 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.52, 24.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      228.93,-15.36 [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 = 83.05,10.18 [deg].

GCN Circular #16831
M.E. Gropp (PSU), S. B. Cenko (GSFC), C. Gronwall (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), V. Mangano (PSU), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), J. L. Racusin (NASA/GSFC) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:
At 15:15:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140919A (trigger=613160). The BAT on-board calculated location is RA, Dec 221.556, -32.154 which is
```
    RA(J2000) = 14h 46m 13s
    Dec(J2000) = -32d 09' 14"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 100 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~1 sec after the trigger.
Due to an observing constraint, Swift will not slew until T0+48.2 minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is M.E. Gropp (mgropp742 AT gmail.com). 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 19 Sep 14 16:22:32 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     613160,   Seg_Num: 0
POINT_RA:        221.592d {+14h 46m 22s} (J2000)
POINT_DEC:       -32.142d {-32d 08' 29"} (J2000)
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58035.92 SOD {16:07:15.92} UT,   3120.4 [sec] since BAT Trigger Time
COUNTS:          4    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:     Fri 19 Sep 14 16:23:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     613160,   Seg_Num: 0
POINT_RA:        221.591d {+14h 46m 22s} (J2000)
POINT_DEC:       -32.143d {-32d 08' 34"} (J2000)
POINT_ROLL:      299.580d
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58040.50 SOD {16:07:20.50} UT,   3125.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        9.143
N_STARS:         122
X_OFFSET:        539 [pixels]
Y_OFFSET:        324 [pixels]
X_MAX:           1498 [pixels]
Y_MAX:           1283 [pixels]
DET_THRESH:      27
PHOTO_THRESH:    17
SL_URL:          sw00613160000msufc3124.fits
SUN_POSTN:       176.93d {+11h 47m 43s}   +1.33d {+01d 19' 51"}
SUN_DIST:         54.06 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.69d {+08h 30m 47s}  +13.74d {+13d 44' 23"}
MOON_DIST:       100.70 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.55, 24.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.95,-15.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 Sep 14 16:24:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     613160,   Seg_Num: 0
POINT_RA:        221.591d {+14h 46m 22s} (J2000)
POINT_DEC:       -32.143d {-32d 08' 34"} (J2000)
POINT_ROLL:      299.580d
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58040.50 SOD {16:07:20.50} UT,   3125.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        9.143
N_STARS:         122
X_OFFSET:        539 [pixels]
Y_OFFSET:        324 [pixels]
X_MAX:           1498 [pixels]
Y_MAX:           1283 [pixels]
DET_THRESH:      27
PHOTO_THRESH:    17
SL_URL:          sw00613160000msufc3124.fits
SUN_POSTN:       176.93d {+11h 47m 43s}   +1.33d {+01d 19' 50"}
SUN_DIST:         54.06 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.70d {+08h 30m 48s}  +13.74d {+13d 44' 21"}
MOON_DIST:       100.69 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.55, 24.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.95,-15.34 [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 19 Sep 14 16:25:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     613160,   Seg_Num: 0
POINT_RA:        221.591d {+14h 46m 22s} (J2000)
POINT_DEC:       -32.143d {-32d 08' 34"} (J2000)
ROLL:            299.580d
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58040.50 SOD {16:07:20.50} UT,   3125.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     432835653
X_OFFSET:        858 [pixels]
Y_OFFSET:        643 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1018
Y_GRB_POS:       803
BINNING_INDEX:   1
IM_URL:          sw00613160000msuni3137.fits
SUN_POSTN:       176.93d {+11h 47m 43s}   +1.33d {+01d 19' 49"}
SUN_DIST:         54.06 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.71d {+08h 30m 50s}  +13.74d {+13d 44' 13"}
MOON_DIST:       100.69 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.55, 24.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.95,-15.34 [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 19 Sep 14 16:25:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     613160,   Seg_Num: 0
POINT_RA:        221.591d {+14h 46m 22s} (J2000)
POINT_DEC:       -32.143d {-32d 08' 34"} (J2000)
ROLL:            299.580d
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58040.50 SOD {16:07:20.50} UT,   3125.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     432835653
X_OFFSET:        858 [pixels]
Y_OFFSET:        643 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1018
Y_GRB_POS:       803
BINNING_INDEX:   1
IM_URL:          sw00613160000msuni3137.fits
SUN_POSTN:       176.93d {+11h 47m 43s}   +1.33d {+01d 19' 49"}
SUN_DIST:         54.06 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.71d {+08h 30m 50s}  +13.74d {+13d 44' 11"}
MOON_DIST:       100.68 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.55, 24.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      228.95,-15.34 [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 19 Sep 14 16:26:37 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     613160,   Seg_Num: 0
GRB_RA:          221.5382d {+14h 46m 09.16s} (J2000),
                 221.7611d {+14h 47m 02.65s} (current),
                 220.7829d {+14h 43m 07.88s} (1950)
GRB_DEC:         -32.1758d {-32d 10' 32.8"} (J2000),
                 -32.2370d {-32d 14' 13.2"} (current),
                 -31.9662d {-31d 57' 58.3"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58105.00 SOD {16:08:25.00} UT,   3189.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       176.93d {+11h 47m 43s}   +1.33d {+01d 19' 48"}
SUN_DIST:         54.03 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.72d {+08h 30m 52s}  +13.73d {+13d 44' 06"}
MOON_DIST:       100.64 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.49, 24.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.92,-15.39 [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 0.11% < P(seren) < 0.58%.

GCN Circular #16832
M. Perri (ASDC), G. Tagliaferri (INAF-OAB), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows (PSU) and J.A. Kennea (PSU) report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 140919A at 16:07:15.9 UT, 3120.4 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 221.53822, -32.17586 which is equivalent to:
```
   RA(J2000)  = 14h 46m 09.17s
   Dec(J2000) = -32d 10' 33.1"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 95 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 7.65 x 10^20 cm^-2 (Willingale et al. 2013).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 Sep 14 16:48:54 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     613160,   Seg_Num: 0
GRB_RA:          221.5376d {+14h 46m 09.02s} (J2000),
                 221.7605d {+14h 47m 02.50s} (current),
                 220.7823d {+14h 43m 07.74s} (1950)
GRB_DEC:         -32.1762d {-32d 10' 34.3"} (J2000),
                 -32.2374d {-32d 14' 14.7"} (current),
                 -31.9666d {-31d 57' 59.7"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58105.00 SOD {16:08:25.00} UT,   3189.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       176.94d {+11h 47m 46s}   +1.32d {+01d 19' 26"}
SUN_DIST:         54.02 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      127.90d {+08h 31m 36s}  +13.69d {+13d 41' 42"}
MOON_DIST:       100.46 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.49, 24.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.92,-15.39 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 19 Sep 14 17:09:10 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     613160,   Seg_Num: 0
GRB_RA:          221.5372d {+14h 46m 08.92s} (J2000),
                 221.7601d {+14h 47m 02.41s} (current),
                 220.7819d {+14h 43m 07.64s} (1950)
GRB_DEC:         -32.1760d {-32d 10' 33.6"} (J2000),
                 -32.2372d {-32d 14' 13.9"} (current),
                 -31.9664d {-31d 57' 59.0"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16919 TJD;   262 DOY;   14/09/19
IMG_START_TIME:  58105.00 SOD {16:08:25.00} UT,   3189.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       176.96d {+11h 47m 49s}   +1.32d {+01d 19' 07"}
SUN_DIST:         54.01 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      128.07d {+08h 32m 16s}  +13.66d {+13d 39' 31"}
MOON_DIST:       100.31 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      329.49, 24.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      228.92,-15.39 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #16833
S. R. Oates (IAA-CSIC, MSSL-UCL) and M.E. Gropp (PSU) report on behalf of the Swift/UVOT team:
UVOT took a finding chart exposure of 150 seconds with the White filter starting 3124 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. We note that within the XRT error circle (Perri et al., GCN Circ. 16832) there is a point source which is also observed in the DSS. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 19.6mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18mag.
No correction has been made for the expected extinction corresponding to E(B-V) of 0.09.
GCN Circular #16834
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1892 s of XRT Photon Counting mode data and 1 UVOT images for GRB 140919A, 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 = 221.53734, -32.17629 which is equivalent to:
```
RA (J2000): 14h 46m 8.96s
Dec (J2000): -32d 10' 34.7"
```
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 #16835
V. Pelassa (UAH) and D. Yu (MPE) report on behalf of the Fermi GBM Team:
"At 15:15:13.54 UT on 19 September 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140919A (trigger 432832516 / 140919636), which was also detected by the Swift/BAT (Gropp et al. 2014, GCN 16831). The GBM on-ground location is consistent with the Swift position. The angle of the Swift position from the Fermi LAT boresight is 34.6 degrees.
The GBM light curve consists of multiple peaks with a duration (T90) of about 109 s (50-300 keV). The time-averaged spectrum from T0-5.12 s to T0+123.91 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.80 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 103 +/- 18 keV (Castor statistics 1085.8 for 610 d.o.f.).
The event fluence (10-1000 keV) in this time interval is (1.20 +/- 0.06)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+5.248 s in the 10-1000 keV band is 3.6 +/- 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 #16836
S. Schmidl (TLS Tautenburg), J. Bolmer and J. Greiner (both MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 140919A (Swift trigger 613160; Gropp et al., GCN #16831) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 23:29 UT on 2014-09-19, 8.2 hrs after the GRB trigger. They were performed at an average seeing of 1.7" and at an average airmass of 2.1.
We detect a source inside the enhanced 1.5" Swift-XRT error cicle, at
```
RA  (J2000.0) =  14:46:08.96
DEC (J2000.0) = -32:10:34.6
```
with an uncertainty of 0.5" in each coordinate.
Based on total exposures of 7.7 minutes in g'r'i'z'and 24.0 minutes in JHK, at a midtime of 9.2 hrs after the burst, we measure the following preliminary magnitudes and upper limits (AB magnitude system):
```
g' = 19.8 +/- 0.1,
r' = 19.5 +/- 0.1,
i' = 19.4 +/- 0.1,
z' = 19.3 +/- 0.1,
J  = 18.9 +/- 0.1,
H  = 19.0 +/- 0.2, and
K  > 18.9.
```
At present we cannot decide if the source is fading.
Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.09 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16837
S. R. Oates (IAA-CSIC/UCL-MSSL) and M.E. Gropp (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140919A 3125 s after the BAT trigger (Gropp et al., GCN Circ. 16831). A fading source consistent with the optical and enhanced XRT position (Schmidl et al. GCN Circ. 16836; Beardmore et al., GCN Circ 16834) is detected in the initial UVOT exposures. Initial identification was complicated by the presence of a point source in the DSS close to the optical position. Photometry is therefore also complicated by the presence of this point source.
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white(FC)         3125         3275          147         16.62 +/- 0.05
white            45180        45480          295         19.40 +/- 0.11
v                 4848         5047          197         17.33 +/- 0.10
b                 8834         9134          295         18.34 +/- 0.09
u                 5462         5613          148         16.86 +/- 0.07
w1                5258         5458          197         16.98 +/- 0.09
m2                5052         5252          197         17.12 +/- 0.11
```
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 #16838
M.E. Gropp (PSU) reports on behalf of the Swift-XRT team:
We have analysed 12 ks of XRT data for GRB 140919A (Gropp et al. GCN Circ. 16831), from 3.1 ks to 57.4 ks after the BAT trigger. The data comprise 99 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 16834).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.00 (+/-0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.05 (+/-0.10). The best-fitting absorption column is 1.54 (+0.30, -0.29) x 10^21 cm^-2, in excess of the Galactic value of 7.6 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (4.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.54 (+0.30, -0.29) x 10^21 cm^-2
Galactic foreground: 7.6 x 10^20 cm^-2
Excess significance: 4.5 sigma
Photon index:	     2.05 (+/-0.10)
```
If the light curve continues to decay with a power-law decay index of 1.00, the count rate at T+24 hours will be 0.061 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.0 x 10^-12 (2.7 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/00613160.
This circular is an official product of the Swift-XRT team.
GCN Circular #16839
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), M.E. Gropp (PSU), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140919A (trigger #613160) (Gropp, et al., GCN Circ. 16831). The BAT ground-calculated position is RA, Dec = 221.540, -32.153 deg which is
```
  RA(J2000)  =  14h 46m 09.5s
  Dec(J2000) = -32d 09' 11.5"
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 14%.
The mask-weighted light curve shows a multi-peaked structure starts at ~ T-1 s and ends at ~T+175 s. The structure includes roughly three peaks at ~T+3 s, ~T+40 s, and ~T+90 s, respectively. T90 (15-350 keV) is 151.3 +- 25.6 sec (estimated error including systematics).
The time-averaged spectrum from T-0.7 to T+174.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.74 +- 0.12. The fluence in the 15-150 keV band is 5.9 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+38.97 sec in the 15-150 keV band is 2.0 +- 0.5 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/613160/BA/

Back to JG's homepage

Jochen Greiner, last update: 20-Sep-2014 [Disclaimer]