Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.2802 -48.7319 0.0154 16.1008 21.7106 0.1239649 12.484 TRIG_00632995
Foreground time interval of the image:
0.000 0.560 (delta_t = 0.560 [sec])
Background time interval of the image:
-239.884 0.000 (delta_t = 239.884 [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 0.032000
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 0.032000
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 0.032000
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 0.000 sec. to 0.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44013 ( -0.23317 0.23122 )
Norm@50keV : 1.37091E-02 ( -0.00173368 0.00172683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9461 for 57 degrees of freedom
# Null hypothesis probability = 5.909914e-01
Photon flux (15-150 keV) in 0.56 sec: 1.68538 ( -0.21791 0.218708 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.35991e-08 ( -1.02301e-08 1.035e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44114 ( -0.627442 0.228896 )
Epeak [keV] : 9999.27 ( -9999.36 -9999.36 )
Norm@50keV : 1.37487E-02 ( -0.0108119 0.0139601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.94 using 59 PHA bins.
# Reduced chi-squared = 0.9632 for 56 degrees of freedom
# Null hypothesis probability = 5.533153e-01
Photon flux (15-150 keV) in 0.56 sec: 1.68742 ( -0.22032 0.21608 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32323e-08 ( -9.97192e-09 1.05185e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.81982 ( -4.81982 -4.81982 )
beta : -1.48246 ( -0.259544 0.24914 )
Epeak [keV] : 22.0987 ( -22.0987 7.67335 )
Norm@50keV : 2128.55 ( -264.679 7.00699e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.57 using 59 PHA bins.
# Reduced chi-squared = 0.9740 for 55 degrees of freedom
# Null hypothesis probability = 5.293100e-01
Photon flux (15-150 keV) in 0.56 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] : 15.1402 (-2.51196 3.349)
R^2/D10^2 : 0.179853 (-0.0897298 0.163106)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.41 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.056801e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.826e-09 1.261e-09
25- 50 1.934e-08 4.088e-09
50-150 3.029e-08 7.773e-09
15-150 5.446e-08 9.699e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.92627 (-0.866402 0.866325)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.55 using 59 PHA bins.
# Reduced chi-squared = 0.9746 for 57 degrees of freedom
# Null hypothesis probability = 5.295214e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.661e-09 5.432e-09
25- 50 1.859e-08 1.025e-08
50-150 4.076e-08 2.244e-08
15-150 6.901e-08 3.833e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.18561 (-3.05761 1.74922)
R1^2/D10^2 : 1.17130 (-0.788006 4.67807)
kT2 [keV] : 44.1588 (-21.5791 -44.4843)
R2^2/D10^2 : 4.55991E-03 (-0.00426177 0.018973)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.37 using 59 PHA bins.
# Reduced chi-squared = 0.9885 for 55 degrees of freedom
# Null hypothesis probability = 4.987376e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.677e-09 4.841e-09
25- 50 1.890e-08 8.620e-09
50-150 4.914e-08 2.649e-08
15-150 7.671e-08 3.574e-08
Peak spectrum fit
Power-law model
Time interval is from -0.220 sec. to 0.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60652 ( -0.2892 0.293618 )
Norm@50keV : 7.49984E-03 ( -0.00126236 0.00124054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.88 using 59 PHA bins.
# Reduced chi-squared = 0.8225 for 57 degrees of freedom
# Null hypothesis probability = 8.281827e-01
Photon flux (15-150 keV) in 1 sec: 0.965718 ( -0.154762 0.155225 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00846e-08 ( -1.25364e-08 1.27955e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.220 sec. to 0.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60468 ( -1.10554 1.27153 )
Epeak [keV] : 9996.18 ( )
Norm@50keV : 7.51742E-03 ( -0.00127027 0.0240853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.88 using 59 PHA bins.
# Reduced chi-squared = 0.8372 for 56 degrees of freedom
# Null hypothesis probability = 8.021939e-01
Photon flux (15-150 keV) in 1 sec: 0.965618 ( -0.160145 0.152012 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00012e-08 ( -7.263e-09 1.28016e-08 ) ergs/cm2
Band function
Time interval is from -0.220 sec. to 0.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.63767 ( -4.63767 -4.63767 )
beta : -1.68107 ( -0.354694 0.321171 )
Epeak [keV] : 22.9538 ( -22.9538 8.5925 )
Norm@50keV : 784.543 ( -122.801 5.72993e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.45 using 59 PHA bins.
# Reduced chi-squared = 0.8445 for 55 degrees of freedom
# Null hypothesis probability = 7.874126e-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] : 12.7951 (-2.45137 3.28168)
R^2/D10^2 : 0.183537 (-0.103837 0.218211)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.89 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.420942e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.373e-09 2.111e-09
25- 50 2.157e-08 5.430e-09
50-150 2.212e-08 8.005e-09
15-150 5.007e-08 1.211e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 180.998 ( )
Norm : 3.91087 (-0.632158 0.890898)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.20 using 59 PHA bins.
# Reduced chi-squared = 0.8280 for 57 degrees of freedom
# Null hypothesis probability = 8.194477e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.776e-09 5.540e-09
25- 50 1.869e-08 1.031e-08
50-150 4.030e-08 2.241e-08
15-150 6.877e-08 3.826e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.73730 (-3.24421 3.52768)
R1^2/D10^2 : 0.867476 (-0.612384 4.8403)
kT2 [keV] : 36.5608 (-32.3224 -36.8309)
R2^2/D10^2 : 3.73940E-03 (-0.00333988 0.0442384)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.82 using 59 PHA bins.
# Reduced chi-squared = 0.8512 for 55 degrees of freedom
# Null hypothesis probability = 7.758914e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.837e-09 5.535e-09
25- 50 1.966e-08 1.046e-08
50-150 4.235e-08 2.467e-08
15-150 7.185e-08 3.664e-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: 1.44013 ( -0.23317 0.23122 )
Norm@50keV : 1.37091E-02 ( -0.00173368 0.00172683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9461 for 57 degrees of freedom
# Null hypothesis probability = 5.909914e-01
Photon flux (15-150 keV) in 0.56 sec: 1.68538 ( -0.21791 0.218708 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.35991e-08 ( -1.02301e-08 1.035e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44114 ( -0.627442 0.228896 )
Epeak [keV] : 9999.27 ( -9999.36 -9999.36 )
Norm@50keV : 1.37487E-02 ( -0.0108887 0.0139601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.94 using 59 PHA bins.
# Reduced chi-squared = 0.9632 for 56 degrees of freedom
# Null hypothesis probability = 5.533153e-01
Photon flux (15-150 keV) in 0.56 sec: 1.68742 ( -0.22032 0.21608 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32323e-08 ( -9.97192e-09 1.05185e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.81982 ( -4.81982 -4.81982 )
beta : -1.48246 ( -0.259544 0.24914 )
Epeak [keV] : 22.0987 ( -22.0987 7.67335 )
Norm@50keV : 2128.55 ( -264.679 7.00699e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.57 using 59 PHA bins.
# Reduced chi-squared = 0.9740 for 55 degrees of freedom
# Null hypothesis probability = 5.293100e-01
Photon flux (15-150 keV) in 0.56 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) = 1.77e-08
S(50-100 keV) = 2.60e-08
T90 vs. Hardness ratio plot
T90 = 0.483999967575073 sec.
Hardness ratio (energy fluence ratio) = 1.46893
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.15218
Count Ratio (50-100 keV) / (15-25 keV) = 0.879347
Mask shadow pattern
IMX = 2.681746765815812E-01, IMY = -1.067771607370521E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
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:
-239.884000 0.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.8257 -62.5685 7.9 49.8 27.5 1.3143 1.5 13.0 GX 301-2
244.9951 -15.6438 0.3 21.7 143.9 10.3645 42.0 0.9 Sco X-1
255.9964 -37.8422 0.7 2.8 -9.1 3.8330 17.8 0.5 4U 1700-377
256.4931 -36.4027 1.6 1.4 -28.0 1.5642 7.1 3.0 GX 349+2
262.9192 -24.7252 3.2 12.0 -154.4 0.8676 3.7 5.0 GX 1+4
264.5326 -44.5092 8.1 11.5 -39.4 -0.3310 -1.4 9.7 4U 1735-44
268.3444 -1.4855 12.8 35.6 -165.0 0.2814 0.9 2.4 SW J1753.5-0127
270.2649 -25.2125 7.9 15.9 -131.4 0.3754 1.6 8.1 GX 5-1
270.3191 -25.7116 5.5 15.6 -129.8 0.6163 2.5 2.1 GRS 1758-258
274.0064 -14.0359 2.8 26.6 -144.4 1.0604 4.0 0.0 GX 17+2
275.9979 -30.4071 4.9 17.5 -106.6 0.5931 2.4 4.5 H1820-303
285.0812 -24.9359 14.4 27.1 -110.7 0.2785 0.8 2.6 HT1900.1-2455
263.1775 -33.6930 0.0 6.2 -107.7 0.5929 2.6 12.7 GX 354-0
270.9836 -34.3155 2.2 12.4 -96.0 1.2220 5.2 ------ UNKNOWN
282.6026 -69.4234 2.7 37.4 -21.9 1.2566 4.3 ------ UNKNOWN
312.9517 -46.2110 3.2 43.7 -64.0 4.3807 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 0.560000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6559 -62.8316 3.4 49.9 27.1 -0.1313 -3.4 3.7 GX 301-2
245.0919 -15.8023 9.0 21.6 143.9 -0.0132 -1.3 11.7 Sco X-1
255.9178 -37.9887 3.6 2.9 -7.7 -0.0295 -3.2 9.3 4U 1700-377
256.6052 -36.2875 5.3 1.4 -33.3 -0.0202 -2.2 11.5 GX 349+2
262.8606 -24.8009 12.5 11.9 -154.4 0.0086 0.9 8.7 GX 1+4
264.5506 -44.5974 8.2 11.6 -39.1 0.0127 1.4 12.1 4U 1735-44
268.3668 -1.3034 3.9 35.7 -165.0 0.0344 2.9 8.9 SW J1753.5-0127
270.2029 -25.0460 18.7 15.9 -131.9 -0.0058 -0.6 4.8 GX 5-1
270.3485 -25.8381 9.8 15.5 -129.4 0.0111 1.2 6.2 GRS 1758-258
274.0741 -14.1837 5.2 26.6 -144.1 0.0237 2.2 9.7 GX 17+2
276.0894 -30.2729 7.4 17.7 -106.9 -0.0158 -1.6 10.2 H1820-303
284.8933 -24.7970 246.6 27.1 -111.2 0.0006 0.0 10.7 HT1900.1-2455
263.1614 -33.9911 0.0 6.1 -105.0 0.0187 2.0 12.7 GX 354-0
244.2801 -48.7319 0.9 16.1 21.7 0.1240 12.5 ------ UNKNOWN
258.7123 -17.8667 2.3 17.4 -177.7 0.0475 5.0 ------ UNKNOWN
10.0730 -84.0385 2.3 57.5 -13.2 0.2163 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
47.216600 179.016600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1116 -60.8051 28.8 42.0 34.2 0.1393 0.4 12.5 Cen X-3
186.8127 -62.8824 3.6 33.9 33.2 0.7333 3.2 8.0 GX 301-2
244.9678 -15.6362 0.4 33.1 170.7 5.7362 28.9 0.7 Sco X-1
255.9832 -37.8308 1.9 13.8 -148.3 0.9275 6.1 0.8 4U 1700-377
256.3792 -36.4182 3.6 15.1 -150.3 0.4977 3.2 2.7 GX 349+2
262.9499 -24.7019 5.3 28.1 -152.4 0.3327 2.2 4.2 GX 1+4
264.7075 -44.4470 24.6 14.6 -109.7 -0.0702 -0.5 1.5 4U 1735-44
268.3963 -1.4530 81.2 51.6 -159.0 0.0561 0.1 1.7 SW J1753.5-0127
270.4098 -24.9347 0.0 31.3 -140.3 0.7171 3.7 11.0 GX 5-1
270.2405 -25.7896 6.7 30.5 -139.6 0.3247 1.7 4.4 GRS 1758-258
274.0046 -14.0375 22.3 42.4 -145.0 0.1430 0.5 0.1 GX 17+2
275.9371 -30.4097 6.1 30.1 -126.1 0.3967 1.9 2.6 H1820-303
285.1472 -24.7924 5.0 39.8 -122.4 0.7367 2.3 9.8 HT1900.1-2455
262.8264 -33.9817 0.0 20.1 -140.6 0.3015 2.2 12.0 GX 354-0
191.5128 -37.5391 3.5 39.3 75.8 2.2112 3.3 ------ UNKNOWN
157.9671 -55.4762 3.2 50.0 37.2 3.0416 3.6 ------ UNKNOWN
227.4586 -2.7410 3.1 48.2 146.7 2.3335 3.8 ------ UNKNOWN
122.8623 -69.2730 2.7 54.5 11.4 3.1651 4.2 ------ UNKNOWN
120.5436 -73.1069 2.2 52.2 7.4 2.5600 5.4 ------ UNKNOWN
Plot creation:
Thu May 28 13:23:28 EDT 2015