Gamma-ray Burst 150523A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 23 May 15 09:30:12 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     454066191
GRB_RA:          118.150d {+07h 52m 36s} (J2000),
                 118.260d {+07h 53m 02s} (current),
                 117.792d {+07h 51m 10s} (1950)
GRB_DEC:         -49.033d {-49d 01' 59"} (J2000),
                 -49.074d {-49d 04' 25"} (current),
                 -48.903d {-48d 54' 09"} (1950)
GRB_ERROR:       8.32 [deg radius, statistical plus systematic]
GRB_INTEN:       237 [cnts/sec]
DATA_SIGNIF:     13.60 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        17165 TJD;   143 DOY;   15/05/23
GRB_TIME:        34188.08 SOD {09:29:48.08} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.60
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        59.86d {+03h 59m 27s}  +20.55d {+20d 33' 02"}
SUN_DIST:         86.78 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      127.46d {+08h 29m 50s}  +14.32d {+14d 19' 04"}
MOON_DIST:        63.91 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      262.83,-10.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      143.36,-67.33 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150523396/quicklook/glg_lc_medres34_bn150523396.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 101.05,9.47 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 23 May 15 09:30:21 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     454066191
GRB_RA:          118.300d {+07h 53m 12s} (J2000),
                 118.410d {+07h 53m 38s} (current),
                 117.941d {+07h 51m 46s} (1950)
GRB_DEC:         -49.017d {-49d 01' 00"} (J2000),
                 -49.057d {-49d 03' 26"} (current),
                 -48.885d {-48d 53' 07"} (1950)
GRB_ERROR:       6.65 [deg radius, statistical plus systematic]
GRB_INTEN:       238 [cnts/sec]
DATA_SIGNIF:     26.30 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17165 TJD;   143 DOY;   15/05/23
GRB_TIME:        34188.08 SOD {09:29:48.08} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        59.86d {+03h 59m 27s}  +20.55d {+20d 33' 02"}
SUN_DIST:         86.85 [deg]   Sun_angle= -3.9 [hr] (East of Sun)
MOON_POSTN:      127.46d {+08h 29m 50s}  +14.32d {+14d 19' 04"}
MOON_DIST:        63.88 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      262.86,-10.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      143.57,-67.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150523396/quicklook/glg_lc_medres34_bn150523396.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 101.05,9.47 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 23 May 15 09:30:42 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     454066191
GRB_RA:          121.660d {+08h 06m 38s} (J2000),
                 121.789d {+08h 07m 09s} (current),
                 121.240d {+08h 04m 58s} (1950)
GRB_DEC:         -43.010d {-43d 00' 35"} (J2000),
                 -43.055d {-43d 03' 17"} (current),
                 -42.865d {-42d 51' 52"} (1950)
GRB_ERROR:       1.82 [deg radius, statistical only]
DATA_SIGNIF:     30.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17165 TJD;   143 DOY;   15/05/23
GRB_TIME:        34188.08 SOD {09:29:48.08} UT
GRB_PHI:          47.00 [deg]
GRB_THETA:        21.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:        59.86d {+03h 59m 27s}  +20.55d {+20d 33' 03"}
SUN_DIST:         85.28 [deg]   Sun_angle= -4.1 [hr] (East of Sun)
MOON_POSTN:      127.46d {+08h 29m 51s}  +14.32d {+14d 19' 01"}
MOON_DIST:        57.61 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      258.84, -5.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      142.01,-60.86 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150523396/quicklook/glg_lc_medres34_bn150523396.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/available until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 23 May 15 09:30:47 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      88
TRIGGER_NUM:     454066191
GRB_RA:          119.867d {+07h 59m 28s} (J2000),
                 119.979d {+07h 59m 55s} (current),
                 119.501d {+07h 58m 00s} (1950)
GRB_DEC:         -48.767d {-48d 46' 00"} (J2000),
                 -48.809d {-48d 48' 33"} (current),
                 -48.629d {-48d 37' 43"} (1950)
GRB_ERROR:       5.10 [deg radius, statistical plus systematic]
GRB_INTEN:       509 [cnts/sec]
DATA_SIGNIF:     42.20 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17165 TJD;   143 DOY;   15/05/23
GRB_TIME:        34188.08 SOD {09:29:48.08} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        59.86d {+03h 59m 27s}  +20.55d {+20d 33' 03"}
SUN_DIST:         87.53 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:      127.46d {+08h 29m 51s}  +14.32d {+14d 19' 01"}
MOON_DIST:        63.47 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      263.16, -9.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      145.54,-66.54 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150523396/quicklook/glg_lc_medres34_bn150523396.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 101.05,9.47 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 23 May 15 09:30:52 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      92
TRIGGER_NUM:     454066191
GRB_RA:          120.117d {+08h 00m 28s} (J2000),
                 120.229d {+08h 00m 55s} (current),
                 119.750d {+07h 59m 00s} (1950)
GRB_DEC:         -48.717d {-48d 43' 00"} (J2000),
                 -48.760d {-48d 45' 34"} (current),
                 -48.578d {-48d 34' 39"} (1950)
GRB_ERROR:       4.92 [deg radius, statistical plus systematic]
GRB_INTEN:       578 [cnts/sec]
DATA_SIGNIF:     66.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17165 TJD;   143 DOY;   15/05/23
GRB_TIME:        34188.08 SOD {09:29:48.08} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.39
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        59.86d {+03h 59m 27s}  +20.55d {+20d 33' 03"}
SUN_DIST:         87.64 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:      127.46d {+08h 29m 51s}  +14.32d {+14d 19' 00"}
MOON_DIST:        63.40 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:      263.20, -9.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      145.83,-66.41 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150523396/quicklook/glg_lc_medres34_bn150523396.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 101.05,9.47 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN Circular #17863
H.-F. Yu (MPE) reports on behalf of the Fermi GBM Team:
"At 09:29:48.08 UT on 23 May 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150523A (trigger 454066191 / 150523396).
The on-ground calculated location, using the GBM trigger data, is RA = 121.2, Dec = -37.3 (J2000 degrees, equivalent to 08h 05m, -37d 20'), with an uncertainty of 1.7 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees).
The trigger resulted in an Autonomous Repoint Request (ARR) that was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight is 22 degrees.
The GBM light curve consists of two pulses with a duration (T90) of about 74.2 s (50-300 keV). The time-averaged spectrum from T0-4.352 s to T0+40.705 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.64 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 574 +/- 24 keV.
The event fluence (10-1000 keV) in this time interval is (3.57 +/- 0.05)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+32.769 s in the 10-1000 keV band is 8.34 +/- 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 #17864
E. Bissaldi (INFN Bari), G. Vianello (Stanford University) and M. Yassine (LUPM) report on behalf of the Fermi-LAT team:
At 09:29:48.08 UT on May 23, 2015, Fermi-LAT detected high-energy emission from GRB 150523A, which was also detected by Fermi-GBM (trigger 454066191 / 150523396) (Yu et al., GCN #17863). The best LAT on-ground location is found to be
RA, Dec = 115.36, -45.40 (J2000)
with an error radius of 0.10 deg (90 per cent containment, statistical error only). This was 26 deg from the LAT boresight at the time of the trigger and triggered an autonomous repoint of the spacecraft.
The data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the trigger with high significance. The highest-energy photon is a 7 GeV event, which is observed 118 s after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi-LAT point of contact for this burst is Elisabetta Bissaldi (Elisabetta.Bissaldi@ba.infn.it).
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 #17866
A.P. Beardmore (U. Leicester), A. Amaral-Rogers (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'a=EF=BF=BD (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 150523A collecting 1.4 ks of Photon Counting (PC) mode data between T0+33.0 ks and T0+34.3 ks.=20
An uncatalogued X-ray source is detected and is above the RASS limit, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=3D115.2859, -45.4209 which is equivalent to:
```
RA (J2000): 07:41:8.62
Dec(J2000): -45:25:15.1
```
with an uncertainty of 3.7 arcsec (radius, 90% confidence). This position is 3.4 arcmin from the Fermi/LAT position. The light curve is consistent with a constant source of mean count rate 1.2e-01 ct/sec. A power-law fit gives an index of -1.41 (+4.59, -0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.71 (+0.29, -0.21). The best-fitting absorption column is consistent with the Galactic value of 3.5 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.5 x 10^-11 (5.9 x 10^-11) erg cm^-2 count^-1.=20
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.5 (+/-1.3) x 10^21 cm^-2
Galactic foreground: 3.5 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.71 (+0.29, -0.21)
```
The results of the XRT-team automatic analysis of the likely afterglow are at http://www.swift.ac.uk/ToO_GRBs/00020520/index_1.php. The results of the full analysis of the XRT observations are available at http://www.swift.ac.uk/ToO_GRBs/00020520.
This circular is an official product of the Swift-XRT team.
GCN Circular #17868
S. Dichiara, C. Guidorzi (U. Ferrara), C.G. Mundell (Bath U.), A. Gomboc (U. Ljubljana) on behalf of a larger collaboration report:
The 1-m LCOGT unit in Cerro Tololo began observing Fermi GBM and LAT GRB 150523A (Yu et al GCN 17863; Bissaldi et al. GCN 17864) on May 23 at 23:17 UT (~13.8 hours after the burst trigger) with SDSS r and i filters. Inside the Swift-XRT error circle (Beardmore et al GCN 17866) we detect an uncatalogued object at the following position:
```
RA(J2000) =   07:41:08.68
Dec(J2000)=  -45:25:12.3
```
with an uncertainty of ~1" and a magnitude of R=20.2 +-0.1 calibrated against nearby USNOB-1 stars. Presently we cannot establish whether the source is fading.
GCN Circular #17869
S. Dichiara, C. Guidorzi (U. Ferrara), S.Kobayashi (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Ljubljana) on behalf of a larger collaboration report:
On May 24 we re-observed GRB 150523A (Yu et al GCN 17863; Bissaldi et al. GCN 17864) using the 2-m Faulkes Telescope South (FTS) with SDSS r and i filters, starting from 08:53 UT (~23.4 hours post burst). Compared with our previous report (Dichiara et al. GCN 17868) the optical candidate appears to have significantly faded, as follows:
```
Mid time(hrs)    Exp(s)       Filter   Magnitude
-----------------------------------------------
13.87            10x120          r'    20.45 +- 0.15
23.69            10x120          r'    21.20 +- 0.22
-----------------------------------------------
```
The corresponding average power-law decay index is 1.3 +- 0.5. Magnitudes are calibrated against USNOB-1 nearby stars. We therefore confirm the afterglow nature of the optical candidate previously reported.
GCN Circular #17870
S. Golenetskii, R. Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 150523A (Fermi-GBM detection: Yu, GCN Circ. 17863; Fermi-LAT detection: Bissaldi, et al., GCN Circ. 17864) triggered Konus-Wind at T0=34189.641 s UT (09:29:49.641).
The burst light curve consists of two pulses with a total duration of ~36 s. The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150523_T34189/
As observed by Konus-Wind, the burst had a fluence of 4.44(-0.69,+0.71)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+31.792 s, of 5.52(-1.52,+1.53)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+41.216 s) is best fit in the 20 keV - 12 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.31(-0.14,+0.16), the high energy photon index beta = -2.66(-0.99,+0.32), the peak energy 399(-42,+52) keV (chi2 = 94/97 dof)
The spectrum near the maximum count rate (measured from T0+24.832 to T0+33.024 s) is best fit in the 20 keV - 12 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.35(-0.15,+0.17), the high energy photon index beta = -2.66(-1.35,+0.34), the peak energy 389(-48,+58) keV (chi2 = 104/97 dof)
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #17872
F. E. Marshall (NASA/GSFC) and A. Vargas (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150523A 32968 s after the LAT trigger (Bissaldi et al. GCN Circ. 17864). A source consistent with the XRT position (Beardmore et al. GCN Circ. 17866) and the optical afterglow position (Dichiara et al. GCN Circ. 17868 and 17869) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  07:41:08.67 = 115.28613 (deg.)
    Dec (J2000) = -45:25:12.4  = -45.42011 (deg.)
```
with an estimated uncertainty of 0.78 arc sec. (radius, 90% confidence).
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            33590        39627         1150         21.83 +/- 0.24
v                34212        40619         1433        >20.5
u                32968        44748         2077        >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.30 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17873
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Fermi/LAT GRB 150523A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020521
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/LAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #17875
T. Fujinuma, M. Tashiro, Y. Terada, T. Yasuda, S. Takeda, T. Nagayoshi, J. Enomoto, S. Nakaya, S. Matsuoka, S. Yabe (Saitama U.), M. Yamauchi, N. Ohmori, R. Kinoshita (Univ. of Miyazaki), W. Iwakiri (RIKEN), K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), M. Ohno, T. Kawano, Y. Fukazawa (Hiroshima U.), Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo) on behalf of the Suzaku WAM team, report:
The long GRB 150523A(Fermi GBM trigger: Yu et al.,GCN 17863; Fermi-LAT detection:Bissaldi et al.,GCN 17864; Konus-Wind observation: Golenetskii et al.,GCN 17870) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 09:29:50 UT (=T0).
The observed light curve shows double-peaked structure starting at T0-4 s, ending at T0+33 s, with a duration (T90) of about 32 seconds. The fluence in 100 - 1000 keV was 1.81(+0.23/-0.25) x 10^-5 erg/cm^2. The 1-s peak flux measured from T0+31 s was 3.52(+0.19/-0.34) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-4s to T0+33s is well fitted by a power-law with exponential cutoff model:
```
dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha    0.70(+0.48/-0.56), and
Epeak    417(+56/-41) keV (chi^2/d.o.f. = 61.26/52).
```
All the quoted errors are at statistical 90% confidence level.
The light curves with 1-sec time resolution for this burst will be appeared at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html

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Jochen Greiner, last update: 27-May-2015 [Disclaimer]