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
118.2477 -41.5889 0.0162 16.9931 34.9004 0.5006448 11.898 TRIG_00507342
Foreground time interval of the image:
-5.600 8.400 (delta_t = 14.000 [sec])
Background time interval of the image:
-239.600 -5.600 (delta_t = 234.000 [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 4.096000
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 4.096000
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 4.096000
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)
The mask-weighted light curves based on cleaned DPHs
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 -5.600 sec. to 8.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85630 ( -0.248692 0.263331 )
Norm@50keV : 1.89106E-03 ( -0.000330024 0.000321523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.671410e-01
Photon flux (15-150 keV) in 14 sec: 0.266491 ( -0.0368864 0.0368867 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43414e-07 ( -4.14949e-08 4.29625e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.600 sec. to 8.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05744 ( -1.45053 1.05722 )
Epeak [keV] : 47.3900 ( -18.6689 -47.3891 )
Norm@50keV : 5.62918E-03 ( -0.00562972 0.0363801 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.71 using 59 PHA bins.
# Reduced chi-squared = 0.9949 for 56 degrees of freedom
# Null hypothesis probability = 4.856560e-01
Photon flux (15-150 keV) in 14 sec: 0.258580 ( -0.038125 0.038336 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20609e-07 ( -4.58668e-08 5.25602e-08 ) ergs/cm2
Band function
Time interval is from -5.600 sec. to 8.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.56563 ( -1.54387 -1.54387 )
beta : -2.10092 ( -1.0626 0.406598 )
Epeak [keV] : 28.0839 ( -28.2119 42.0721 )
Norm@50keV : 0.556678 ( -0.47875 155.947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.607929e-01
Photon flux (15-150 keV) in 14 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26342e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1525 (-1.53613 1.84853)
R^2/D10^2 : 0.119887 (-0.0562073 0.102821)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.79 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.785387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.541e-08 9.674e-09
25- 50 8.993e-08 1.610e-08
50-150 4.903e-08 1.835e-08
15-150 1.744e-07 3.375e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.9957 (-29.3886 67.1457)
Norm : 1.26297 (-0.230264 0.305627)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.81 using 59 PHA bins.
# Reduced chi-squared = 0.9790 for 57 degrees of freedom
# Null hypothesis probability = 5.199813e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.584e-08 8.645e-09
25- 50 7.523e-08 1.395e-08
50-150 1.053e-07 5.996e-08
15-150 2.264e-07 6.216e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.91813 (-2.82391 3.56784)
R1^2/D10^2 : 0.571374 (-0.429832 5.84994)
kT2 [keV] : 17.7062 (-6.40108 -17.7062)
R2^2/D10^2 : 1.01708E-02 (-0.010103 0.060467)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.61 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.517084e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.547e-08 2.475e-08
25- 50 7.635e-08 3.930e-08
50-150 9.603e-08 5.917e-08
15-150 2.179e-07 1.133e-07
Peak spectrum fit
Power-law model
Time interval is from 1.400 sec. to 2.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84504 ( -0.455955 0.510966 )
Norm@50keV : 3.95497E-03 ( -0.00130033 0.00122933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.08 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.494907e-01
Photon flux (15-150 keV) in 1 sec: 0.554795 ( -0.139672 0.139678 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.63677e-08 ( -1.13493e-08 1.20348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.400 sec. to 2.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63981 ( -2.16039 0.621653 )
Epeak [keV] : 72.6038 ( )
Norm@50keV : 5.22431E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.03 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 56 degrees of freedom
# Null hypothesis probability = 1.300496e-01
Photon flux (15-150 keV) in 1 sec: 0.551032 ( -0.141975 0.142022 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54684e-08 ( -1.2613e-08 1.27502e-08 ) ergs/cm2
Band function
Time interval is from 1.400 sec. to 2.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63161 ( -0.503862 0.990526 )
beta : -9.34420 ( 9.37065 19.3706 )
Epeak [keV] : 76.7600 ( -58.3229 -76.5753 )
Norm@50keV : 5.20964E-03 ( -0.00193527 0.0077657 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.03 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 55 degrees of freedom
# Null hypothesis probability = 1.115132e-01
Photon flux (15-150 keV) in 1 sec: 0.552698 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51836e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.62901 (-2.99675 4.80087)
R^2/D10^2 : 0.296754 (-0.228393 0.916447)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.69 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 57 degrees of freedom
# Null hypothesis probability = 7.861511e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.526e-09 3.415e-09
25- 50 1.301e-08 6.688e-09
50-150 6.080e-09 4.573e-09
15-150 2.462e-08 1.508e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.7200 (-49.321 -85.7188)
Norm : 2.56008 (-0.772698 1.31426)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.13 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 57 degrees of freedom
# Null hypothesis probability = 1.484208e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.668e-09 4.040e-09
25- 50 1.116e-08 6.687e-09
50-150 1.648e-08 1.310e-08
15-150 3.430e-08 2.226e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.47668 (-2.49718 3.64994)
R1^2/D10^2 : 1.86264 (-1.56233 20.9907)
kT2 [keV] : 22.1470 (-19.1683 172.949)
R2^2/D10^2 : 1.02594E-02 (-0.0100609 0.114198)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.28 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 55 degrees of freedom
# Null hypothesis probability = 1.238562e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.361e-09 4.438e-09
25- 50 1.015e-08 5.175e-09
50-150 1.839e-08 1.160e-08
15-150 3.590e-08 1.823e-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: 1.85630 ( -0.248692 0.263331 )
Norm@50keV : 1.89106E-03 ( -0.000330024 0.000321523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.671410e-01
Photon flux (15-150 keV) in 14 sec: 0.266491 ( -0.0368864 0.0368867 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43414e-07 ( -4.14949e-08 4.29625e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05744 ( -1.45053 1.05722 )
Epeak [keV] : 47.3900 ( -47.2888 -47.3891 )
Norm@50keV : 5.62918E-03 ( -0.00562972 0.0363801 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.71 using 59 PHA bins.
# Reduced chi-squared = 0.9949 for 56 degrees of freedom
# Null hypothesis probability = 4.856560e-01
Photon flux (15-150 keV) in 14 sec: 0.258580 ( -0.038125 0.038336 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20609e-07 ( -4.58668e-08 5.25602e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.56563 ( -1.54387 -1.54387 )
beta : -2.10092 ( -1.0626 0.406598 )
Epeak [keV] : 28.0839 ( -28.2119 42.0721 )
Norm@50keV : 0.556678 ( -0.47875 162.03 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.607929e-01
Photon flux (15-150 keV) in 14 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26342e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.00e-08
S(50-100 keV) = 7.73e-08
T90 vs. Hardness ratio plot
T90 = 13 sec.
Hardness ratio (energy fluence ratio) = 1.10429
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.27089
Count Ratio (50-100 keV) / (15-25 keV) = 0.582739
Mask shadow pattern
IMX = 2.506366746392414E-01, IMY = -1.748493670789323E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.600000 -5.600000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5126 -40.5483 1.2 8.2 -13.5 2.0397 10.0 0.8 Vela X-1
170.2622 -60.5856 2.0 35.9 -45.2 1.7150 5.6 2.7 Cen X-3
186.6556 -62.7183 5.3 43.7 -48.0 1.1526 2.2 3.1 GX 301-2
114.3120 -32.2557 2.4 18.5 67.3 1.1019 4.8 ------ UNKNOWN
96.2382 -66.7674 2.6 41.6 5.2 1.4109 4.5 ------ UNKNOWN
92.5749 -78.8272 2.9 49.9 -7.2 1.8138 4.0 ------ UNKNOWN
150.6959 -50.3127 3.1 20.9 -43.9 0.7442 3.8 ------ UNKNOWN
169.5947 16.9877 3.4 58.8 -159.3 4.7582 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.600000 8.400000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.2819 -40.6525 21.9 8.3 -12.3 0.0212 0.5 12.7 Vela X-1
170.2358 -60.4923 27.9 35.8 -45.3 -0.0242 -0.4 8.2 Cen X-3
186.5070 -62.7333 7.3 43.7 -47.9 0.1573 1.6 4.7 GX 301-2
72.2043 -55.5630 2.4 49.4 24.8 0.7781 4.7 ------ UNKNOWN
118.2477 -41.5889 1.0 17.0 34.9 0.5006 11.9 ------ UNKNOWN
156.3569 17.9217 1.9 53.9 -173.3 0.7014 6.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
243.300610 546.300630
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9823 -15.6296 0.2 29.0 -72.6 31.9594 64.0 0.7 Sco X-1
254.3040 35.4095 4.3 55.1 0.0 4.3188 2.7 8.5 Her X-1
256.2074 -37.9358 5.8 27.5 -125.6 0.9156 2.0 11.8 4U 1700-377
256.5154 -36.3905 3.8 26.2 -123.6 1.3660 3.1 4.3 GX 349+2
262.8176 -24.6435 15.4 14.4 -107.8 0.2718 0.7 12.1 GX 1+4
264.7714 -44.4631 6.9 29.7 -144.2 0.6836 1.7 1.5 4U 1735-44
268.3120 -1.4613 5.3 16.1 -4.8 0.7013 2.2 3.4 SW J1753.5-0127
270.2850 -25.1467 6.1 10.2 -133.3 0.7689 1.9 4.0 GX 5-1
270.2008 -25.9303 8.4 10.9 -134.9 0.5671 1.4 12.5 GRS 1758-258
274.0519 -14.0346 1.9 2.3 -7.7 2.1894 6.0 2.7 GX 17+2
275.7846 -30.3041 4.8 14.3 -161.4 0.7597 2.4 8.2 H1820-303
284.9244 -25.0555 7.6 12.8 156.9 0.4729 1.5 10.1 HT1900.1-2455
288.8077 10.9608 1.5 30.2 48.1 3.9739 7.5 1.1 GRS 1915+105
262.9547 -33.8995 2.3 21.0 -129.8 1.9083 4.9 4.2 GX 354-0
302.3189 -5.1262 2.8 28.8 91.4 2.4452 4.2 ------ UNKNOWN
269.8776 33.3409 2.6 49.7 14.9 4.2569 4.5 ------ UNKNOWN
276.5964 -9.3641 3.3 6.8 32.6 1.0798 3.6 ------ UNKNOWN
293.9929 -50.9288 2.7 38.0 -178.5 2.1082 4.4 ------ UNKNOWN
253.6981 -45.8593 2.4 34.8 -132.7 2.3883 4.7 ------ UNKNOWN
241.1350 -9.8269 3.0 33.7 -62.9 2.1559 3.8 ------ UNKNOWN
251.9772 -71.3095 2.3 57.0 -150.6 9.9105 4.9 ------ UNKNOWN
Plot creation:
Sat May 30 21:07:57 EDT 2015