Gamma-ray Burst 160419A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 19 Apr 16 15:16:56 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     683383,   Seg_Num: 0
GRB_RA:           16.424d {+01h 05m 42s} (J2000),
                  16.620d {+01h 06m 29s} (current),
                  15.824d {+01h 03m 18s} (1950)
GRB_DEC:         -27.343d {-27d 20' 32"} (J2000),
                 -27.256d {-27d 15' 19"} (current),
                 -27.610d {-27d 36' 35"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5794 [cnts]    Image_Peak=418 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       24720 [cnts]
BKG_TIME:        54983.85 SOD {15:16:23.85} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17497 TJD;   110 DOY;   16/04/19
GRB_TIME:        54997.41 SOD {15:16:37.41} UT
GRB_PHI:         -144.59 [deg]
GRB_THETA:        48.69 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     48.07 [sigma]
IMAGE_SIGNIF:    16.19 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +4 -100  +0 -76  +0 
SUN_POSTN:        27.91d {+01h 51m 37s}  +11.47d {+11d 28' 07"}
SUN_DIST:         40.24 [deg]   Sun_angle= 0.8 [hr] (West of Sun)
MOON_POSTN:      182.03d {+12h 08m 06s}   +0.14d {+00d 08' 39"}
MOON_DIST:       149.48 [deg]
MOON_ILLUM:      94 [%]
GAL_COORDS:      217.61,-86.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        3.21,-31.42 [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 = 359.76,-14.32 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=482771799).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 19 Apr 16 15:16:39 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     482771799
GRB_RA:           13.233d {+00h 52m 56s} (J2000),
                  13.435d {+00h 53m 44s} (current),
                  12.614d {+00h 50m 27s} (1950)
GRB_DEC:         -18.783d {-18d 46' 59"} (J2000),
                 -18.695d {-18d 41' 41"} (current),
                 -19.055d {-19d 03' 16"} (1950)
GRB_ERROR:       17.40 [deg radius, statistical plus systematic]
GRB_INTEN:       87 [cnts/sec]
DATA_SIGNIF:     6.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17497 TJD;   110 DOY;   16/04/19
GRB_TIME:        54995.39 SOD {15:16:35.39} UT
GRB_PHI:         354.00 [deg]
GRB_THETA:       120.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.24
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,1, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        27.91d {+01h 51m 37s}  +11.47d {+11d 28' 07"}
SUN_DIST:         33.37 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      182.02d {+12h 08m 06s}   +0.14d {+00d 08' 42"}
MOON_DIST:       158.33 [deg]
MOON_ILLUM:      94 [%]
GAL_COORDS:      125.37,-81.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        4.39,-22.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160419637/quicklook/glg_lc_medres34_bn160419637.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 41.27,23.75 [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 19 Apr 16 15:16:48 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     482771799
GRB_RA:           21.720d {+01h 26m 53s} (J2000),
                  21.911d {+01h 27m 39s} (current),
                  21.133d {+01h 24m 32s} (1950)
GRB_DEC:         -27.470d {-27d 28' 11"} (J2000),
                 -27.386d {-27d 23' 08"} (current),
                 -27.729d {-27d 43' 44"} (1950)
GRB_ERROR:       10.01 [deg radius, statistical only]
DATA_SIGNIF:     10.80 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17497 TJD;   110 DOY;   16/04/19
GRB_TIME:        54995.39 SOD {15:16:35.39} UT
GRB_PHI:           6.00 [deg]
GRB_THETA:       126.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:        27.91d {+01h 51m 37s}  +11.47d {+11d 28' 07"}
SUN_DIST:         39.29 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:      182.02d {+12h 08m 06s}   +0.14d {+00d 08' 40"}
MOON_DIST:       146.73 [deg]
MOON_ILLUM:      94 [%]
GAL_COORDS:      217.45,-82.12 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        8.13,-33.63 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160419637/quicklook/glg_lc_medres34_bn160419637.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_482771799.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~4 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 19 Apr 16 15:17:53 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     482771799
GRB_RA:           19.710d {+01h 18m 50s} (J2000),
                  19.901d {+01h 19m 36s} (current),
                  19.123d {+01h 16m 30s} (1950)
GRB_DEC:         -30.100d {-30d 06' 00"} (J2000),
                 -30.015d {-30d 00' 52"} (current),
                 -30.363d {-30d 21' 44"} (1950)
GRB_ERROR:       8.19 [deg radius, statistical only]
DATA_SIGNIF:     10.20 [sigma]
DATA_INTERVAL:   8.192 [sec]
GRB_DATE:        17497 TJD;   110 DOY;   16/04/19
GRB_TIME:        54995.39 SOD {15:16:35.39} UT
GRB_PHI:           5.00 [deg]
GRB_THETA:       129.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:        27.91d {+01h 51m 37s}  +11.47d {+11d 28' 08"}
SUN_DIST:         42.19 [deg]   Sun_angle= 0.5 [hr] (West of Sun)
MOON_POSTN:      182.03d {+12h 08m 08s}   +0.14d {+00d 08' 30"}
MOON_DIST:       145.63 [deg]
MOON_ILLUM:      94 [%]
GAL_COORDS:      240.84,-83.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        4.79,-35.18 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2016/bn160419637/quicklook/glg_lc_medres34_bn160419637.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_482771799.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~4 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=7447).

GCN NOTICE

 
TITLE:           GCN/CALET NOTICE
NOTICE_DATE:     Tue 19 Apr 16 15:17:00 UT
NOTICE_TYPE:     CALET GBM Flight Lightcurve
POINT_RA:        333.40d {+22h 13m 37s} (J2000),
POINT_DEC:       -19.76d {-19d 45' 46"} (J2000),
TRIGGER_NUM:     1145113851
TRIGGER_DATE:    17497 TJD;   110 DOY;   16/04/19
TRIGGER_TIME:    54995.41 SOD {15:16:35.41} UT
TRIGGER_DET:     1 1 0 (HXM1 HXM2 SGM)
SIGNIFICANCE:    12.19 [sigma] 
FOREGND_DUR:     4.00 [sec]
BACKGND_DUR1:    16.00 [sec]   
ENERGY_BAND:     25-100 [keV]  
SC_LON_LAT:      256.30,-19.68 [deg]
LC_URL:          http://cgbm.calet.jp/cgbm_trigger/flight//1145113851/index.html
COMMENTS:        CALET-GBM Flight Lightcurve.
COMMENTS:
COMMENTS:        NOTE: This CALET_GBM_FLT_LC event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=683383).
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 19 Apr 16 15:17:25 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    7447,   Sub_Num: 0
GRB_INTEN:      9.09 [sigma]   
GRB_TIME:       54993.56 SOD {15:16:33.56} UT 
GRB_DATE:       17497 TJD;   110 DOY;   16/04/19
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(2.0<100sec) coincident with the CALET event (trignum=1145113851).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:
+ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2016-04/2016-04-19T15-16-33.3930-20794-35728-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 19 Apr 16 15:20:16 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     683383,   Seg_Num: 0
GRB_RA:           16.424d {+01h 05m 42s} (J2000),
                  16.620d {+01h 06m 29s} (current),
                  15.824d {+01h 03m 18s} (1950)
GRB_DEC:         -27.343d {-27d 20' 32"} (J2000),
                 -27.256d {-27d 15' 19"} (current),
                 -27.610d {-27d 36' 35"} (1950)
GRB_DATE:        17497 TJD;   110 DOY;   16/04/19
GRB_TIME:        54997.41 SOD {15:16:37.41} UT
TRIGGER_INDEX:   148
GRB_PHI:         -144.59 [deg]
GRB_THETA:        48.69 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     48.07 [sigma]
IMAGE_SIGNIF:    16.19 [sigma]
LC_URL:          sw00683383000msb.lc
SUN_POSTN:        27.91d {+01h 51m 38s}  +11.47d {+11d 28' 10"}
SUN_DIST:         40.24 [deg]   Sun_angle= 0.8 [hr] (West of Sun)
MOON_POSTN:      182.05d {+12h 08m 12s}   +0.14d {+00d 08' 08"}
MOON_DIST:       149.48 [deg]
MOON_ILLUM:      94 [%]
GAL_COORDS:      217.61,-86.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        3.21,-31.42 [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 = 359.76,-14.32 [deg].

GCN Circular #19326
C. B. Markwardt (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), A. Melandri (INAF-OAB), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift Team:
At 15:16:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160419A (trigger=683383). Swift did not slew to the burst due to an observing constraint. The BAT on-board calculated location is RA, Dec 16.424, -27.343 which is
```
   RA(J2000) = 01h 05m 42s
   Dec(J2000) = -27d 20' 32"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single symmetric peak structure with a duration of about 20 sec. The peak count rate was ~5000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 01:44 UT on 2016 April 30. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #19327
B. Mailyan (UAH), C. Meegan (UAH) and P. Veres (UAH) report on behalf of the Fermi GBM Team:
"At 15:16:35.39 UT on 19 April 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 160419A (trigger 482771799 / 160419.637), which was also detected by the Swift/BAT (C. B. Markwardt et al. 2016, GCN 19326). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time using the Swift BAT position is about 127 degrees.
The GBM light curve consists of a weak burst with a duration (T90) of about 24 s (50-300 keV). The time-averaged spectrum from T0-1.3 s to T0+2.7 s is best fit by a power law function with an exponential high-energy cutoff function, with Epeak = 438 +/- 118 keV and alpha = -0.49 +/- 0.28.
The event fluence (10-1000 keV) in this time interval is (1.675 +/- 0.221)E-06 erg/cm^2. The 1s peak photon flux measured starting from T0-1.15 s in the 10-1000 keV band is 1.92 +/- 0.25 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #19328
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160419A (trigger #683383) (Markwardt et al., GCN Circ. 19326). The BAT ground-calculated position is RA, Dec = 16.418, -27.341 deg which is
```
  RA(J2000)  =  01h 05m 40.3s
  Dec(J2000) = -27d 20' 28.7"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 16%.
The mask-weighted light curve shows a triangle-shaped, single-peaked structure that starts at ~ T-4 s, peaks at ~T0, and ends at ~T0+8 s. T90 (15-350 keV) is 8.8 +- 1.1 sec (estimated error including systematics).
The time-averaged spectrum from T-4.5 to T+8.5 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.76 +- 0.33, and Epeak of 107.1 +- 35.2 keV (chi squared 40.46 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 3.5 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+0.00 sec in the 15-150 keV band is 8.9 +- 0.7 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.40 +- 0.07 (chi squared 53.01 for 57 d.o.f.). 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/683383/BA/
GCN Circular #19332
M. L. Cherry (LSU), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena) and the CALET collaboration:
The long-duration GRB 160419A (Markwardt et al., GCN circ. 19326; Mailyan et al., GCN circ. 19327) triggered the CALET Gamma-Ray Burst Monitor (CGBM) at 15:16:35.4 on 19 April 2016. The burst signal was seen by all CGBM instruments.
The light curve of the HXM shows several spikes. The emission starts from T0-2 sec, peaks at T0+3 sec and ends at T0+10 sec. The T90 duration measured by the HXM2 data is 6.2 +- 0.9 sec (50-250 keV).
The CGBM data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.

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Jochen Greiner, last update: 23-Apr-2016 [Disclaimer]