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
241.2902 -47.4602 0.0173 19.5375 149.0987 0.4517674 11.094 TRIG_00530267
Foreground time interval of the image:
-0.244 12.637 (delta_t = 12.881 [sec])
Background time interval of the image:
-239.264 -0.244 (delta_t = 239.020 [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 1.024000
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 1.024000
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 1.024000
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 -0.244 sec. to 24.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82529 ( -0.298745 0.31229 )
Norm@50keV : 1.30289E-03 ( -0.000230868 0.000222634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.37 using 59 PHA bins.
# Reduced chi-squared = 0.7785 for 57 degrees of freedom
# Null hypothesis probability = 8.887101e-01
Photon flux (15-150 keV) in 24.4 sec: 0.181326 ( -0.0277931 0.0279279 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92444e-07 ( -5.11056e-08 5.24432e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.244 sec. to 24.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18874 ( )
Epeak [keV] : 74.3499 ( )
Norm@50keV : 8.55028E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.87 using 59 PHA bins.
# Reduced chi-squared = 0.7834 for 56 degrees of freedom
# Null hypothesis probability = 8.804389e-01
Photon flux (15-150 keV) in 24.4 sec: 0.181758 ( -0.028435 0.027479 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.928e-07 ( -5.21723e-08 5.05226e-08 ) ergs/cm2
Band function
Time interval is from -0.244 sec. to 24.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40561 ( 1.40696 1.40696 )
beta : -1.82646 ( 1.82646 0.299927 )
Epeak [keV] : 25.3848 ( -24.8654 -24.8654 )
Norm@50keV : 3.05275E-03 ( -0.00308764 0.400827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.37 using 59 PHA bins.
# Reduced chi-squared = 0.8067 for 55 degrees of freedom
# Null hypothesis probability = 8.467355e-01
Photon flux (15-150 keV) in 24.4 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] : 10.7873 (-2.36945 3.48727)
R^2/D10^2 : 5.98548E-02 (-0.0590526 0.0946389)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.59 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 57 degrees of freedom
# Null hypothesis probability = 2.844926e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.536e-08 9.780e-09
25- 50 9.749e-08 2.351e-08
50-150 6.311e-08 2.541e-08
15-150 1.960e-07 5.286e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 120.199 (-58.053 -115.155)
Norm : 0.738621 (-0.139639 0.243179)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.26 using 59 PHA bins.
# Reduced chi-squared = 0.8116 for 57 degrees of freedom
# Null hypothesis probability = 8.445401e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.694e-08 2.616e-08
25- 50 8.400e-08 4.700e-08
50-150 1.500e-07 9.881e-08
15-150 2.810e-07 1.676e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.86429 (-1.66564 2.03678)
R1^2/D10^2 : 0.492303 (-0.337553 1.03055)
kT2 [keV] : 28.7826 (-10.228 32.6752)
R2^2/D10^2 : 1.43893E-03 (-0.00126408 0.00514608)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.08 using 59 PHA bins.
# Reduced chi-squared = 0.7833 for 55 degrees of freedom
# Null hypothesis probability = 8.781224e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.774e-08 3.259e-08
25- 50 7.862e-08 3.528e-08
50-150 1.722e-07 1.020e-07
15-150 3.086e-07 1.605e-07
Peak spectrum fit
Power-law model
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02688 ( -0.289388 0.311714 )
Norm@50keV : 5.64993E-03 ( -0.00117672 0.00115127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.75 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 1.997191e-01
Photon flux (15-150 keV) in 1 sec: 0.858146 ( -0.145524 0.145727 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.21792e-08 ( -1.00201e-08 1.03488e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.141057 ( -2.23563 1.47531 )
Epeak [keV] : 40.1652 ( -13.7421 14.4843 )
Norm@50keV : 6.99577E-02 ( -0.0701782 1.47088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.47 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 56 degrees of freedom
# Null hypothesis probability = 3.175968e-01
Photon flux (15-150 keV) in 1 sec: 0.804677 ( -0.148355 0.149883 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.51368e-08 ( -9.5476e-09 1.09725e-08 ) ergs/cm2
Band function
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.139420 ( -4.2477 -2.57346 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 40.1524 ( -11.6122 14.4855 )
Norm@50keV : 7.01369E-02 ( -0.0701366 1.46831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.47 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.848638e-01
Photon flux (15-150 keV) in 1 sec: 0.811333 ( 6.18867 -0.153473 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.52771e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0448 (-1.61353 1.94878)
R^2/D10^2 : 0.405712 (-0.203369 0.396033)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.35 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.916283e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.350e-09 2.525e-09
25- 50 2.089e-08 5.630e-09
50-150 1.105e-08 4.577e-09
15-150 4.029e-08 1.009e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.1888 (-21.2862 43.1825)
Norm : 4.55160 (-1.10847 1.45057)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.07 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 57 degrees of freedom
# Null hypothesis probability = 3.002928e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.144e-08 2.786e-09
25- 50 1.744e-08 3.490e-09
50-150 1.989e-08 9.363e-09
15-150 4.877e-08 1.231e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.42497 (-6.46932 -6.46932)
R1^2/D10^2 : 1.22735 (-1.15569 -1.15569)
kT2 [keV] : 14.6916 (-15.1066 -15.1066)
R2^2/D10^2 : 5.97347E-02 (-0.0516912 0.496332)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.17 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.939686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.009e-08 5.840e-09
25- 50 1.906e-08 1.036e-08
50-150 1.638e-08 9.215e-09
15-150 4.553e-08 2.470e-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: 1.91904 ( -0.250312 0.262397 )
Norm@50keV : 1.96317E-03 ( -0.000319007 0.000311175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.71 using 59 PHA bins.
# Reduced chi-squared = 0.7844 for 57 degrees of freedom
# Null hypothesis probability = 8.814110e-01
Photon flux (15-150 keV) in 12.88 sec: 0.284041 ( -0.0389384 0.0390029 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32525e-07 ( -3.62551e-08 3.71637e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35847 ( -1.34722 0.820177 )
Epeak [keV] : 48.2635 ( )
Norm@50keV : 4.10018E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.84 using 59 PHA bins.
# Reduced chi-squared = 0.7829 for 56 degrees of freedom
# Null hypothesis probability = 8.810608e-01
Photon flux (15-150 keV) in 12.88 sec: 0.276619 ( -0.041184 0.041156 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18295e-07 ( -4.29084e-08 4.48507e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.986901 ( 0.313056 0.313056 )
beta : -2.20652 ( 2.19854 0.430482 )
Epeak [keV] : 30.8967 ( -34.3417 52.9428 )
Norm@50keV : 0.183282 ( -0.186032 94.683 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.66 using 59 PHA bins.
# Reduced chi-squared = 0.7756 for 55 degrees of freedom
# Null hypothesis probability = 8.875591e-01
Photon flux (15-150 keV) in 12.88 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2111e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 8.31e-08
S(50-100 keV) = 9.38e-08
T90 vs. Hardness ratio plot
T90 = 19.8839999437332 sec.
Hardness ratio (energy fluence ratio) = 1.12876
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.813848
Count Ratio (50-100 keV) / (15-25 keV) = 0.614256
Mask shadow pattern
IMX = -3.044848519053462E-01, IMY = -1.822395329684092E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-239.264000 -0.244000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4041 -60.7131 5.1 52.3 -162.3 1.6886 2.3 6.0 Cen X-3
186.5401 -62.7477 3.8 45.6 -167.7 1.7018 3.0 3.5 GX 301-2
244.9786 -15.6425 0.1 16.6 24.3 24.8259 89.9 0.1 Sco X-1
255.9837 -37.7575 3.0 20.4 105.9 1.2572 3.8 5.2 4U 1700-377
256.2633 -36.2747 0.0 20.2 101.6 -0.2951 -0.9 12.2 GX 349+2
262.9906 -24.7827 4.4 26.2 72.2 1.0439 2.6 2.4 GX 1+4
264.7386 -44.5859 4.8 29.1 115.4 1.0276 2.4 8.2 4U 1735-44
268.2660 -1.3435 3.3 42.7 40.4 2.4547 3.5 9.0 SW J1753.5-0127
270.4403 -25.0325 8.6 32.6 76.3 0.7105 1.3 8.9 GX 5-1
270.1465 -25.7921 3.9 32.2 77.5 1.5492 2.9 8.9 GRS 1758-258
274.0255 -13.9137 22.0 40.0 60.9 0.4388 0.5 7.5 GX 17+2
275.7655 -30.4921 9.5 36.2 87.4 -0.9084 -1.2 11.2 H1820-303
262.8080 -33.8637 8.0 25.1 93.1 0.5365 1.4 9.2 GX 354-0
240.7205 -82.6055 3.2 53.9 163.0 4.9898 3.6 ------ UNKNOWN
241.2443 10.0934 2.4 39.5 -4.5 2.0127 4.7 ------ UNKNOWN
195.2566 -57.9097 2.1 39.5 -164.4 2.1053 5.4 ------ UNKNOWN
228.7359 -1.9950 2.6 27.2 -27.3 1.3176 4.4 ------ UNKNOWN
179.7788 -52.2397 3.3 46.0 -152.2 2.0378 3.5 ------ UNKNOWN
206.8832 10.4552 3.9 47.1 -53.5 4.6801 3.0 ------ UNKNOWN
206.5912 10.0983 2.9 47.0 -54.1 6.4233 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.244000 12.636630
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2256 -60.6819 20.4 52.4 -162.3 -0.0556 -0.6 4.4 Cen X-3
186.5315 -62.9504 5.3 45.7 -168.0 0.1445 2.2 11.3 GX 301-2
244.9929 -15.6580 1.4 16.6 24.3 -0.2997 -8.2 1.3 Sco X-1
256.0497 -37.8748 4.5 20.5 106.2 -0.1156 -2.6 3.5 4U 1700-377
256.4800 -36.2837 4.7 20.4 101.5 0.1051 2.4 8.6 GX 349+2
262.9629 -24.6058 7.1 26.2 71.8 -0.0878 -1.6 8.8 GX 1+4
264.7062 -44.4221 3.6 29.0 115.1 0.1767 3.2 2.3 4U 1735-44
268.5043 -1.6275 0.0 42.7 40.9 -0.2652 -2.6 13.3 SW J1753.5-0127
270.1857 -24.9762 10.6 32.4 76.1 -0.0740 -1.1 8.2 GX 5-1
270.1383 -25.7683 32.9 32.2 77.5 0.0242 0.3 9.0 GRS 1758-258
273.8631 -14.0882 8.3 39.7 61.0 -0.1723 -1.4 8.9 GX 17+2
276.1049 -30.4082 9.4 36.5 87.3 0.1322 1.2 9.6 H1820-303
263.1048 -33.9706 30.4 25.4 93.4 -0.0201 -0.4 10.0 GX 354-0
271.7030 -79.7487 2.3 53.3 156.3 1.0048 5.1 ------ UNKNOWN
258.7419 3.5677 2.1 40.2 24.6 0.3796 5.5 ------ UNKNOWN
241.2902 -47.4602 1.0 19.5 149.1 0.4534 11.1 ------ UNKNOWN
188.5147 -55.7589 2.0 41.9 -159.0 0.3190 5.7 ------ UNKNOWN
195.1624 -50.1753 2.6 36.2 -153.1 0.2164 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
55.636610 962.816000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1944 -60.5053 34.9 41.4 -136.6 0.5019 0.3 7.9 Cen X-3
186.4969 -62.6834 2.8 33.5 -138.5 3.8340 4.1 6.8 GX 301-2
244.9797 -15.6394 0.2 32.0 5.6 52.5848 71.8 0.0 Sco X-1
256.0101 -37.8575 1.7 14.5 52.6 3.9555 6.8 1.4 4U 1700-377
256.3775 -36.4034 3.2 15.8 49.6 2.2531 3.5 3.0 GX 349+2
262.9370 -24.7339 6.0 28.5 43.5 1.5495 1.9 4.0 GX 1+4
264.7875 -44.4945 9.4 16.6 87.1 0.8754 1.2 3.3 4U 1735-44
270.3320 -25.0911 8.3 32.1 54.8 1.4364 1.4 2.7 GX 5-1
270.1792 -25.8545 4.6 31.4 55.5 2.5384 2.5 9.4 GRS 1758-258
273.9026 -13.9200 8.5 43.2 48.8 2.7919 1.4 9.2 GX 17+2
275.8466 -30.3453 6.0 31.6 68.4 1.9853 1.9 4.3 H1820-303
262.7710 -33.7248 0.0 21.3 56.3 1.2870 1.8 12.7 GX 354-0
255.4363 -35.9357 2.1 15.6 46.4 3.2993 5.4 ------ UNKNOWN
250.0787 -16.4078 3.2 31.9 15.0 2.5635 3.6 ------ UNKNOWN
249.3796 -14.1147 2.7 34.1 13.0 3.2407 4.2 ------ UNKNOWN
205.2842 -11.3873 3.5 47.0 -53.1 11.1407 3.4 ------ UNKNOWN
162.5846 -53.1592 3.8 47.9 -128.9 9.9976 3.1 ------ UNKNOWN
Plot creation:
Sat May 30 18:49:01 EDT 2015