Gamma-ray Burst 170419B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Apr 17 21:47:50 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     748947,   Seg_Num: 0
GRB_RA:           60.498d {+04h 01m 59s} (J2000),
                  60.697d {+04h 02m 47s} (current),
                  59.923d {+03h 59m 42s} (1950)
GRB_DEC:         -15.143d {-15d 08' 32"} (J2000),
                 -15.095d {-15d 05' 42"} (current),
                 -15.281d {-15d 16' 50"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4147 [cnts]    Image_Peak=206 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       25172 [cnts]
BKG_TIME:        77613.06 SOD {21:33:33.06} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17862 TJD;   109 DOY;   17/04/19
GRB_TIME:        77626.05 SOD {21:33:46.05} UT
GRB_PHI:         -38.57 [deg]
GRB_THETA:        35.16 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     15.62 [sigma]
IMAGE_SIGNIF:    9.51 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0 -100  +0 -74  +0 
SUN_POSTN:        27.93d {+01h 51m 44s}  +11.48d {+11d 28' 43"}
SUN_DIST:         41.94 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      307.25d {+20h 28m 59s}  -16.76d {-16d 45' 45"}
MOON_DIST:       107.02 [deg]
MOON_ILLUM:      45 [%]
GAL_COORDS:      207.80,-44.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       54.52,-35.02 [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 = 259.39,-19.26 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=514330431).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Apr 17 21:33:51 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     514330431
GRB_RA:           63.783d {+04h 15m 08s} (J2000),
                  63.968d {+04h 15m 52s} (current),
                  63.250d {+04h 13m 00s} (1950)
GRB_DEC:         -23.133d {-23d 07' 59"} (J2000),
                 -23.091d {-23d 05' 26"} (current),
                 -23.257d {-23d 15' 26"} (1950)
GRB_ERROR:       11.60 [deg radius, statistical plus systematic]
GRB_INTEN:       188 [cnts/sec]
DATA_SIGNIF:     13.50 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17862 TJD;   109 DOY;   17/04/19
GRB_TIME:        77626.81 SOD {21:33:46.81} UT
GRB_PHI:          18.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        27.92d {+01h 51m 42s}  +11.48d {+11d 28' 31"}
SUN_DIST:         49.39 [deg]   Sun_angle= -2.4 [hr] (East of Sun)
MOON_POSTN:      307.12d {+20h 28m 30s}  -16.78d {-16d 46' 55"}
MOON_DIST:       106.53 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      219.75,-44.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       55.93,-43.52 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170419898/quicklook/glg_lc_medres34_bn170419898.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 275.43,19.25 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Apr 17 21:33:58 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     514330431
GRB_RA:           59.200d {+03h 56m 48s} (J2000),
                  59.391d {+03h 57m 34s} (current),
                  58.648d {+03h 54m 36s} (1950)
GRB_DEC:         -20.383d {-20d 22' 59"} (J2000),
                 -20.334d {-20d 20' 02"} (current),
                 -20.527d {-20d 31' 36"} (1950)
GRB_ERROR:       9.12 [deg radius, statistical plus systematic]
GRB_INTEN:       194 [cnts/sec]
DATA_SIGNIF:     19.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17862 TJD;   109 DOY;   17/04/19
GRB_TIME:        77626.81 SOD {21:33:46.81} UT
GRB_PHI:          15.98 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.68
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,1,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        27.92d {+01h 51m 42s}  +11.48d {+11d 28' 31"}
SUN_DIST:         44.38 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:      307.12d {+20h 28m 30s}  -16.78d {-16d 46' 54"}
MOON_DIST:       103.88 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      214.19,-47.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       51.35,-39.78 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170419898/quicklook/glg_lc_medres34_bn170419898.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 275.43,19.25 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 19 Apr 17 21:34:02 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     514330431
GRB_RA:           64.150d {+04h 16m 36s} (J2000),
                  64.345d {+04h 17m 23s} (current),
                  63.586d {+04h 14m 21s} (1950)
GRB_DEC:         -16.950d {-16d 56' 59"} (J2000),
                 -16.908d {-16d 54' 28"} (current),
                 -17.073d {-17d 04' 20"} (1950)
GRB_ERROR:       4.21 [deg radius, statistical only]
DATA_SIGNIF:     21.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17862 TJD;   109 DOY;   17/04/19
GRB_TIME:        77626.81 SOD {21:33:46.81} UT
GRB_PHI:           8.00 [deg]
GRB_THETA:        37.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:        27.92d {+01h 51m 42s}  +11.48d {+11d 28' 31"}
SUN_DIST:         45.84 [deg]   Sun_angle= -2.4 [hr] (East of Sun)
MOON_POSTN:      307.12d {+20h 28m 30s}  -16.78d {-16d 46' 54"}
MOON_DIST:       109.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      211.91,-41.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       58.24,-37.58 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2017/bn170419898/quicklook/glg_lc_medres34_bn170419898.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_514330431.fits
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/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 19 Apr 17 21:48:24 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     748947,   Seg_Num: 0
GRB_RA:           60.498d {+04h 01m 59s} (J2000),
                  60.697d {+04h 02m 47s} (current),
                  59.923d {+03h 59m 42s} (1950)
GRB_DEC:         -15.143d {-15d 08' 32"} (J2000),
                 -15.095d {-15d 05' 42"} (current),
                 -15.281d {-15d 16' 50"} (1950)
GRB_DATE:        17862 TJD;   109 DOY;   17/04/19
GRB_TIME:        77626.05 SOD {21:33:46.05} UT
TRIGGER_INDEX:   148
GRB_PHI:         -38.57 [deg]
GRB_THETA:        35.16 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.62 [sigma]
IMAGE_SIGNIF:    9.51 [sigma]
LC_URL:          sw00748947000msb.lc
SUN_POSTN:        27.93d {+01h 51m 44s}  +11.48d {+11d 28' 44"}
SUN_DIST:         41.94 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      307.25d {+20h 29m 01s}  -16.76d {-16d 45' 42"}
MOON_DIST:       107.02 [deg]
MOON_ILLUM:      45 [%]
GAL_COORDS:      207.80,-44.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       54.52,-35.02 [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 = 259.39,-19.26 [deg].

GCN Circular #21016
A. Cholden-Brown (PSU), S. D. Barthelmy (GSFC), C. Gronwall (PSU), N. P. M. Kuin (UCL-MSSL), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 21:33:46 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170419B (trigger=748947). Swift did not slew due to Sun constraint. The BAT on-board calculated location is RA, Dec 60.498, -15.143, which is
```
   RA(J2000)  =  04h 01m 59s
   Dec(J2000) = -15d 08' 32"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single with a duration of about 10 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~3 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 05:29 UT on 2017 June 19. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is A. Cholden-Brown (aaronb AT swift.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #21019
P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team:
"At 21:33:46.807 UT on 19 April 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170419B (trigger 514330431 / 170419898). which was also detected by the Swift/BAT (Cholden-Brown et al., GCN 21016). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 41 degrees.
The GBM light curve shows a single pulse with a duration (T90) of about 24 s (50-300 keV). The time-averaged spectrum from T0-0.5 s to T0+5.1 s is best fit by a Band function with Epeak = 116 +/- 19 keV, alpha = -0.03 +/- 0.29, and beta = -2.07 +/- 0.15.
The event fluence (10-1000 keV) in this time interval is (2.4 +/- 0.2)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.2 s in the 10-1000 keV band is 3.8 +/- 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 #21024
A. Klotz, D. Turpin (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), M. Boer, (UNS-CNRS-OCA), Gendre B. (UVI - Etelman Obs.), A. Williams (PO-UWA), R. Martin (PO-UWA) report:
We imaged the field of GRB 170419B detected by SWIFT (trigger 748947) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 13.3h after the GRB trigger. The elevation of the field decreased from 31 degrees above horizon and weather conditions were good.
We co-added a series of exposures but we did not find any optical transcient in the BAT error box provided by Cholden-Brown et al. (GCNC 21016):
t0+13.3h to t0+13.5h : Rlim = 19.2
Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.
GCN Circular #21025
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), A. Cholden-Brown (PSU), J. R. Cummings (CPI), N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+262 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170419B (trigger #748947) (Cholden-Brown et al., GCN Circ. 21016). The BAT ground-calculated position is RA, Dec = 60.494, -15.121 deg which is
```
  RA(J2000)  =  04h 01m 58.5s
  Dec(J2000) = -15d 07' 14.3"
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 52%.
The mask-weighted light curve shows a single-pulse structure that starts at ~ T0 and peaks at ~T+2. The major part of the pulse ends at ~T+10 s, and the weaker tail emission lasts till ~T+90 s. T90 (15-350 keV) is 77.2 +- 9.8 sec (estimated error including systematics).
The time-averaged spectrum from T+0.3 to T+88.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.47 +- 0.13. The fluence in the 15-150 keV band is 1.9 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.98 sec in the 15-150 keV band is 2.4 +- 0.2 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/748947/BA/

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Jochen Greiner, last update: 20-Apr-2017 [Disclaimer]