Gamma-ray Burst 190515A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 15 May 19 04:33:27 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     579587588
GRB_RA:          137.067d {+09h 08m 16s} (J2000),
                 137.364d {+09h 09m 27s} (current),
                 136.298d {+09h 05m 12s} (1950)
GRB_DEC:         +33.700d {+33d 42' 00"} (J2000),
                 +33.621d {+33d 37' 15"} (current),
                 +33.903d {+33d 54' 09"} (1950)
GRB_ERROR:       7.43 [deg radius, statistical plus systematic]
GRB_INTEN:       588 [cnts/sec]
DATA_SIGNIF:     13.10 [sigma]
INTEG_TIME:      0.256 [sec]
GRB_DATE:        18618 TJD;   135 DOY;   19/05/15
GRB_TIME:        16383.14 SOD {04:33:03.14} UT
GRB_PHI:         110.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 0.2560 [sec]
HARD_RATIO:      0.16
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:        51.71d {+03h 26m 51s}  +18.79d {+18d 47' 27"}
SUN_DIST:         76.22 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      187.30d {+12h 29m 12s}   +2.27d {+02d 16' 02"}
MOON_DIST:        56.12 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      190.75, 42.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      129.43, 16.48 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190515190/quicklook/glg_lc_medres34_bn190515190.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 125.80,20.63 [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 15 May 19 04:33:42 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     579587588
GRB_RA:          134.240d {+08h 56m 58s} (J2000),
                 134.544d {+08h 58m 11s} (current),
                 133.453d {+08h 53m 49s} (1950)
GRB_DEC:         +35.980d {+35d 58' 48"} (J2000),
                 +35.905d {+35d 54' 16"} (current),
                 +36.173d {+36d 10' 22"} (1950)
GRB_ERROR:       5.61 [deg radius, statistical only]
DATA_SIGNIF:     13.60 [sigma]
DATA_INTERVAL:   0.256 [sec]
GRB_DATE:        18618 TJD;   135 DOY;   19/05/15
GRB_TIME:        16383.14 SOD {04:33:03.14} UT
GRB_PHI:         108.00 [deg]
GRB_THETA:        37.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:        51.71d {+03h 26m 51s}  +18.79d {+18d 47' 27"}
SUN_DIST:         73.47 [deg]   Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN:      187.30d {+12h 29m 13s}   +2.27d {+02d 15' 59"}
MOON_DIST:        59.14 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      187.35, 40.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      126.41, 17.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190515190/quicklook/glg_lc_medres34_bn190515190.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_579587588.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the CALET_GBM event (trignum=1241929925).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 15 May 19 04:42:21 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     579587588
GRB_RA:          137.230d {+09h 08m 55s} (J2000),
                 137.538d {+09h 10m 09s} (current),
                 136.433d {+09h 05m 44s} (1950)
GRB_DEC:         +39.290d {+39d 17' 24"} (J2000),
                 +39.211d {+39d 12' 38"} (current),
                 +39.493d {+39d 29' 35"} (1950)
GRB_ERROR:       5.00 [deg radius, statistical only]
GRB_DATE:        18618 TJD;   135 DOY;   19/05/15
GRB_TIME:        16383.14 SOD {04:33:03.14} UT
GRB_PHI:         114.00 [deg]
GRB_THETA:        35.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:        51.72d {+03h 26m 52s}  +18.79d {+18d 47' 32"}
SUN_DIST:         75.10 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      187.38d {+12h 29m 32s}   +2.23d {+02d 14' 03"}
MOON_DIST:        58.40 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      183.23, 42.66 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      127.74, 21.84 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190515190/quicklook/glg_lc_medres34_bn190515190.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190515190/quicklook/glg_locplot_all_bn190515190.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        This is likely a Short GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the CALET_GBM event (trignum=1241929925).

GCN Circular #24550
The Fermi GBM team reports the detection of a likely SHORT GRB
At 04:33:03 UT on 15 May 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190515A (trigger 579587588.135176 / 190515190).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 137.2, Dec = 39.3 (J2000 degrees, equivalent to J2000 09h 08m, 39d 17'), with a statistical uncertainty of 5.0 degrees.
The angle from the Fermi LAT boresight is 35.0 degrees.
The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190515190/quicklook/glg_skymap_all_bn190515190.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190515190/quicklook/glg_healpix_all_bn190515190.fit
The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190515190/quicklook/glg_lc_medres34_bn190515190.gif
GCN Circular #24560
D. Kocevski (NASA/MSFC), M. Axelsson (KTH and Stockholm Univ.), L. Scotton (INFN Torino), E. Burns (NASA/GSFC), and M. Arimoto (Kanazawa Univ.) report on behalf of the Fermi-LAT team:
At 04:33:03 on 2019-05-15, Fermi-LAT triggered on high-energy emission from short GRB 190515A, which was also detected by Fermi-GBM (trigger 579587588/190515190).
The best LAT on-ground location is found to be
RA, Dec = 137.687 , 29.276 (J2000)
with an error radius of 0.907 deg (90% containment, statistical error only). This was 44 deg from the LAT boresight at the time of the trigger and 10 deg from the center of the GBM localization (GCN 24550).
The data from the Fermi-LAT show a significant increase in the event rate that is temporally correlated with the GBM emission with high significance. The highest-energy photon is a 874 MeV event which is observed 3 seconds after the GBM trigger.
The photon flux above 100 MeV in the time interval 0-300s after the GBM trigger is 6.5e-06 ph/cm2/s +/- 2.4e-06. The estimated photon index above 100 MeV is -2.6 +/- 0.5.
The Fermi-LAT point of contact for this burst is Magnus Axelsson (magnusa@fysik.su.se).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #24562
O.J. Roberts (USRA/NASA-MSFC) reports on behalf of the Fermi GBM Team:
"At 04:33:03.14 UT on the 15th May 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190515A (trigger 579587588 / 190515190), which was also detected by the LAT (Kocevski et al. 2019, GCN 24560) The GBM on-ground location is consistent with the LAT position.
The angle from the Fermi LAT boresight is 44 degrees.
The GBM light curve shows a bright short spike with a duration (T90) of about 0.5 s (10-1000 keV). The time-averaged spectrum from T0-0.26 s to T0+0.38 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.4 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 960 +/- 251 keV.
The event fluence (10-1000 keV) in this time interval is (1.233 +/- 0.070)E-06 erg/cm^2. The 64-msec peak photon flux measured starting from T0+0.2 s in the 10-1000 keV band is 8.2 +/- 0.9 ph/s/cm^2."
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #24563
S. Xiao, C. Cai, Q. Luo, Q. B. Yi, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
At 2019-05-15T04:33:03.000 (T0), Insight-HXMT/HE detected GRB 190515A(trigger ID: HEB190515189) in a routine search of the data, which was also triggered by Fermi/GBM (GCN#24550), Fermi/LAT (D. Kocevski et al., GCN#24560) and Swift/XRT (M. J. Moss et al., GCN#24553).
The Insight-HXMT/HE light curve mainly consists of single pulse with a duration (T90) of 0.44 s measured from T0+0.02 s. The 1-ms peak rate, measured from T0+0.20 s, is 5641 cnts/sec. The total counts from this burst is 1906 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB190515189_lc.jpg
All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.
GCN Circular #24575
S. Sugita, A. Yoshida, T. Sakamoto, V. Pal'shin(AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The short hard GRB 190515A (Fermi-LAT detection: Kocevski et al., GCN Circ. 24560; Fermi GBM detection: Roberts, GCN Circ. 24562) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 04:33:03.330 UTC on 15 May 2019. The burst signal was seen by all CGBM detectors.
The burst light curve shows a single pulse which starts at T+0 sec, peaks at T+0.19 sec and ends at T+0.45 sec. The T90 and T50 durations measured by the SGM data are 0.38 +- 0.14 sec and 0.19 +- 0.06 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1241929925/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN Circular #24575
S. Sugita, A. Yoshida, T. Sakamoto, V. Pal'shin(AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The short hard GRB 190515A (Fermi-LAT detection: Kocevski et al., GCN Circ. 24560; Fermi GBM detection: Roberts, GCN Circ. 24562) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 04:33:03.330 UTC on 15 May 2019. The burst signal was seen by all CGBM detectors.
The burst light curve shows a single pulse which starts at T+0 sec, peaks at T+0.19 sec and ends at T+0.45 sec. The T90 and T50 durations measured by the SGM data are 0.38 +- 0.14 sec and 0.19 +- 0.06 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1241929925/
The CALET 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: 17-May-2019 [Disclaimer]