Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
279.9682 -57.4376 0.0063 21.4334 143.6024 3.8264819 30.274 TRIG_00331093
Foreground time interval of the image:
-65.888 31.157 (delta_t = 97.045 [sec])
Background time interval of the image:
-755.343 -657.490 (delta_t = 97.854 [sec])
-239.544 -65.888 (delta_t = 173.656 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -65.888 sec. to 195.912 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62337 ( -0.0710292 0.0712831 )
Norm@50keV : 1.74187E-03 ( -6.69985e-05 6.68685e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.25 using 59 PHA bins.
# Reduced chi-squared = 0.8640 for 57 degrees of freedom
# Null hypothesis probability = 7.575742e-01
Photon flux (15-150 keV) in 261.8 sec: 0.225489 ( -0.0089747 0.00899718 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.25318e-06 ( -1.74007e-07 1.74679e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -65.888 sec. to 195.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34871 ( -0.293757 0.274026 )
Epeak [keV] : 118.170 ( -37.2307 1873.81 )
Norm@50keV : 2.38834E-03 ( -0.000624538 0.000934056 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.33 using 59 PHA bins.
# Reduced chi-squared = 0.8273 for 56 degrees of freedom
# Null hypothesis probability = 8.181732e-01
Photon flux (15-150 keV) in 261.8 sec: 0.221304 ( -0.009831 0.009848 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14882e-06 ( -2.04204e-07 2.03392e-07 ) ergs/cm2
Band function
Time interval is from -65.888 sec. to 195.912 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.575374 ( -0.595367 4.1762 )
beta : -1.75670 ( -0.182282 0.137037 )
Epeak [keV] : 49.3934 ( -21.4514 75.2939 )
Norm@50keV : 7.43199E-03 ( -0.00747772 25.9896 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.46 using 59 PHA bins.
# Reduced chi-squared = 0.7902 for 55 degrees of freedom
# Null hypothesis probability = 8.693256e-01
Photon flux (15-150 keV) in 261.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14068e-06 ( -4.13885e-06 -1.93784e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.9816 ( )
R^2/D10^2 : 3.06711E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 189.18 using 59 PHA bins.
# Reduced chi-squared = 3.3189 for 57 degrees of freedom
# Null hypothesis probability = 4.406636e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.316e-07 2.644e-08
25- 50 1.232e-06 5.890e-08
50-150 1.584e-06 1.245e-07
15-150 3.148e-06 1.532e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 167.689 (-30.7902 -167.675)
Norm : 0.915399 (-0.0402438 0.0437665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.36 using 59 PHA bins.
# Reduced chi-squared = 0.8133 for 57 degrees of freedom
# Null hypothesis probability = 8.420383e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.091e-07 3.770e-08
25- 50 1.147e-06 9.412e-08
50-150 2.365e-06 6.788e-07
15-150 4.121e-06 7.383e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.87009 (-0.899906 0.9276)
R1^2/D10^2 : 0.169618 (-0.0511073 0.0834581)
kT2 [keV] : 29.2265 (-4.51149 6.91591)
R2^2/D10^2 : 1.66724E-03 (-0.000850906 0.00139904)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.24 using 59 PHA bins.
# Reduced chi-squared = 0.8044 for 55 degrees of freedom
# Null hypothesis probability = 8.500548e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.505e-07 6.283e-08
25- 50 1.197e-06 1.164e-07
50-150 2.411e-06 4.644e-07
15-150 4.159e-06 6.977e-07
Peak spectrum fit
Power-law model
Time interval is from 7.524 sec. to 8.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34307 ( -0.202893 0.203346 )
Norm@50keV : 1.06988E-02 ( -0.00122181 0.0012194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.41 using 59 PHA bins.
# Reduced chi-squared = 0.9546 for 57 degrees of freedom
# Null hypothesis probability = 5.727679e-01
Photon flux (15-150 keV) in 1 sec: 1.28707 ( -0.149289 0.149625 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04656e-07 ( -1.33425e-08 1.34929e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.524 sec. to 8.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.989272 ( -0.843848 0.458046 )
Epeak [keV] : 152.823 ( -152.828 -152.828 )
Norm@50keV : 1.57591E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.73 using 59 PHA bins.
# Reduced chi-squared = 0.9595 for 56 degrees of freedom
# Null hypothesis probability = 5.612349e-01
Photon flux (15-150 keV) in 1 sec: 1.26404 ( -0.15682 0.15657 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02339e-07 ( -1.43496e-08 1.4351e-08 ) ergs/cm2
Band function
Time interval is from 7.524 sec. to 8.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.991760 ( -0.535152 0.724791 )
beta : -10.0000 ( 10 1.77636e-14 )
Epeak [keV] : 152.324 ( -74.0794 -152.502 )
Norm@50keV : 1.57689E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.73 using 59 PHA bins.
# Reduced chi-squared = 0.9769 for 55 degrees of freedom
# Null hypothesis probability = 5.231833e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.1422 (-2.65107 3.13772)
R^2/D10^2 : 7.82630E-02 (-0.032129 0.0546438)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.09 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 57 degrees of freedom
# Null hypothesis probability = 1.308346e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.144e-09 1.215e-09
25- 50 2.393e-08 3.735e-09
50-150 5.729e-08 1.395e-08
15-150 8.637e-08 1.476e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.31479 (-0.605084 0.605025)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 0.9993 for 57 degrees of freedom
# Null hypothesis probability = 4.765384e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.324e-08 7.335e-09
25- 50 2.547e-08 1.396e-08
50-150 5.585e-08 3.079e-08
15-150 9.456e-08 5.160e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.83708 (-1.83351 2.40695)
R1^2/D10^2 : 2.13390 (-1.52404 7.7545)
kT2 [keV] : 25.1620 (-4.94108 8.26716)
R2^2/D10^2 : 2.30116E-02 (-0.0141775 0.0108328)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.03 using 59 PHA bins.
# Reduced chi-squared = 0.9278 for 55 degrees of freedom
# Null hypothesis probability = 6.270677e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.180e-08 5.737e-09
25- 50 2.306e-08 9.647e-09
50-150 6.805e-08 2.937e-08
15-150 1.029e-07 4.395e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36774 ( -0.0840951 0.0837063 )
Norm@50keV : 2.46999E-03 ( -0.000113917 0.000113904 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.18 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.483864e-02
Photon flux (15-150 keV) in 97.04 sec: 0.298672 ( -0.0145916 0.014627 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33181e-06 ( -1.16673e-07 1.17086e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05810 ( -0.347357 0.303812 )
Epeak [keV] : 159.528 ( -58.1203 -159.529 )
Norm@50keV : 3.48145E-03 ( -0.000966026 0.00158266 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.47 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 56 degrees of freedom
# Null hypothesis probability = 1.065931e-01
Photon flux (15-150 keV) in 97.04 sec: 0.293416 ( -0.015525 0.015544 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27741e-06 ( -1.3146e-07 1.30567e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.75021 ( -4.54892 -4.05309 )
beta : -1.51959 ( -0.130293 0.118197 )
Epeak [keV] : 37.3242 ( -4.62788 35.2433 )
Norm@50keV : 0.276811 ( -0.280502 27.8485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.48 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.277988e-01
Photon flux (15-150 keV) in 97.04 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.11e-06
S(50-100 keV) = 1.45e-06
T90 vs. Hardness ratio plot
T90 = 187.824000030756 sec.
Hardness ratio (energy fluence ratio) = 1.30631
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.36078
Count Ratio (50-100 keV) / (15-25 keV) = 0.86078
Mask shadow pattern
IMX = -3.159848729512354E-01, IMY = -2.329440581907557E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-755.343390 -657.489800
-239.544000 -65.888000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3510 -60.6936 8.6 55.2 -148.9 1.7832 1.3 4.4 Cen X-3
186.6547 -62.8185 3.4 47.2 -149.0 1.5613 3.4 2.9 GX 301-2
244.9681 -15.6470 0.3 27.9 -36.8 8.0932 34.3 0.8 Sco X-1
255.7891 -37.8772 15.6 3.9 -55.3 0.1448 0.7 9.6 4U 1700-377
256.3535 -36.4654 3.5 4.7 -38.8 0.6446 3.3 4.7 GX 349+2
263.0046 -24.7157 7.1 16.0 5.8 0.3064 1.6 1.8 GX 1+4
264.8713 -44.4471 15.1 5.6 131.7 0.1402 0.8 5.5 4U 1735-44
268.3888 -1.4294 2.0 39.9 8.3 1.7836 5.9 1.9 SW J1753.5-0127
270.3367 -25.1308 1.9 17.8 28.1 1.1789 6.0 4.2 GX 5-1
270.3492 -25.7614 4.2 17.2 29.1 0.5394 2.8 2.8 GRS 1758-258
274.0554 -14.0934 5.3 29.3 24.2 0.5064 2.2 4.5 GX 17+2
275.8608 -30.3355 2.5 16.7 52.1 0.9488 4.5 3.8 H1820-303
285.1104 -24.7739 9.1 26.5 55.9 -0.3282 -1.3 9.7 HT1900.1-2455
263.0306 -33.8266 1.6 7.2 18.0 1.4528 7.4 2.1 GX 354-0
266.5530 -32.2155 1.2 10.0 30.8 2.0379 9.6 ------ UNKNOWN
255.1979 -41.6370 1.7 3.5 -116.3 1.2260 6.7 ------ UNKNOWN
226.7241 -3.8793 4.4 47.0 -53.2 2.4941 2.6 ------ UNKNOWN
215.4734 -22.6366 2.5 41.1 -83.5 4.3952 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-65.888000 31.156620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2942 -60.7450 5.3 55.2 -149.0 -1.1862 -2.2 7.3 Cen X-3
186.5951 -62.9191 16.6 47.2 -149.1 0.1626 0.7 9.1 GX 301-2
244.8286 -15.6417 24.5 27.9 -37.1 -0.0621 -0.5 8.7 Sco X-1
255.9212 -37.8348 14.2 3.9 -53.8 0.0869 0.8 3.1 4U 1700-377
256.2481 -36.4209 6.3 4.8 -39.3 -0.1911 -1.9 9.0 GX 349+2
262.8980 -24.8881 175.4 15.8 5.6 0.0074 0.1 10.5 GX 1+4
264.5339 -44.4359 31.3 5.4 133.4 0.0385 0.4 9.0 4U 1735-44
268.4840 -1.4506 614.6 39.9 8.4 -0.0033 -0.0 7.0 SW J1753.5-0127
270.4383 -25.1271 6.4 17.8 28.3 -0.2107 -1.8 8.9 GX 5-1
270.3454 -25.8034 7.5 17.2 29.2 -0.1806 -1.5 4.3 GRS 1758-258
273.8608 -13.9534 5.3 29.3 23.7 0.2998 2.2 9.8 GX 17+2
275.7508 -30.3439 7.5 16.6 51.9 -0.1779 -1.5 9.1 H1820-303
285.1815 -24.8402 6.2 26.5 56.1 0.2954 1.9 9.3 HT1900.1-2455
262.9148 -33.9810 7.1 7.0 17.7 0.1688 1.6 9.5 GX 354-0
306.6726 -28.7465 2.5 40.0 82.5 2.1223 4.6 ------ UNKNOWN
15.8339 -79.8626 2.3 54.6 163.3 3.4156 5.1 ------ UNKNOWN
298.7740 -69.2083 3.1 35.3 151.6 0.6374 3.8 ------ UNKNOWN
23.3104 -83.0223 2.0 53.6 167.3 3.0121 5.9 ------ UNKNOWN
279.9682 -57.4376 0.4 21.4 143.6 3.8262 30.3 ------ UNKNOWN
275.0389 -53.7486 1.9 16.9 141.6 0.6823 6.2 ------ UNKNOWN
217.1420 -54.6138 2.1 31.3 -136.8 0.7388 5.4 ------ UNKNOWN
UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
75.956590 962.513000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3137 -60.6238 82.0 49.8 -143.1 0.2027 0.1 0.1 Cen X-3
186.6047 -62.7380 1.8 42.7 -138.0 5.9816 6.3 2.4 GX 301-2
244.9676 -15.6290 0.9 49.3 -47.1 26.9011 12.2 1.0 Sco X-1
255.7440 -37.9376 0.0 25.2 -50.0 0.3486 0.7 12.8 4U 1700-377
256.2931 -36.3989 2.9 26.3 -47.3 2.0820 4.0 7.0 GX 349+2
262.9972 -24.8899 9.8 34.8 -28.0 0.6480 1.2 8.7 GX 1+4
264.9549 -44.3296 14.2 16.1 -42.3 -0.3472 -0.8 11.6 4U 1735-44
268.2859 -1.4597 14.1 56.8 -14.4 1.5859 0.8 4.9 SW J1753.5-0127
270.3187 -25.0675 1.4 33.1 -16.5 4.2378 8.1 2.0 GX 5-1
270.3160 -25.7864 3.7 32.4 -16.7 1.5998 3.1 2.7 GRS 1758-258
273.9052 -14.0244 5.7 43.7 -8.9 1.5002 2.0 5.9 GX 17+2
275.9167 -30.3446 2.7 27.3 -8.0 1.9743 4.3 1.4 H1820-303
285.1812 -24.9754 10.2 32.7 8.4 0.6012 1.1 8.6 HT1900.1-2455
262.9727 -33.8359 1.1 26.3 -33.6 4.6075 10.4 0.8 GX 354-0
279.9916 -57.4523 1.4 0.0 106.5 4.2476 8.4 ------ UNKNOWN
278.9050 -5.9766 2.3 51.5 -1.7 5.2591 5.0 ------ UNKNOWN
277.3173 -23.7466 2.2 33.8 -4.7 3.5071 5.3 ------ UNKNOWN
276.4749 -31.5710 2.6 26.0 -7.2 1.9459 4.5 ------ UNKNOWN
266.5416 -32.2277 0.7 26.8 -26.2 7.4664 16.5 ------ UNKNOWN
257.3179 -44.1057 2.3 19.4 -56.7 2.3599 5.1 ------ UNKNOWN
255.1558 -41.6521 1.4 22.3 -56.0 4.3738 8.3 ------ UNKNOWN
Plot creation:
Sun May 31 06:07:27 EDT 2015