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
235.8799 -7.2988 0.0200 36.0466 -63.6585 2.0262079 9.633 TRIG_00531428
Foreground time interval of the image:
4.420 82.701 (delta_t = 78.281 [sec])
Background time interval of the image:
-239.000 4.420 (delta_t = 243.420 [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 72.000000
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 72.000000
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 72.000000
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 4.420 sec. to 83.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47808 ( -0.229509 0.227962 )
Norm@50keV : 1.87516E-03 ( -0.000248916 0.000248097 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.72 using 59 PHA bins.
# Reduced chi-squared = 0.8548 for 57 degrees of freedom
# Null hypothesis probability = 7.742381e-01
Photon flux (15-150 keV) in 78.59 sec: 0.232739 ( -0.0321597 0.03235 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40319e-06 ( -1.98579e-07 2.00485e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.420 sec. to 83.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.510612 ( -1.47286 1.03929 )
Epeak [keV] : 76.1070 ( -21.3349 -76.0969 )
Norm@50keV : 5.76153E-03 ( -0.00576376 0.0255084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.37 using 59 PHA bins.
# Reduced chi-squared = 0.8281 for 56 degrees of freedom
# Null hypothesis probability = 8.169389e-01
Photon flux (15-150 keV) in 78.59 sec: 0.221565 ( -0.034862 0.034729 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29629e-06 ( -2.34096e-07 2.35456e-07 ) ergs/cm2
Band function
Time interval is from 4.420 sec. to 83.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 9.86235E-02 ( -1.34019 4.06019 )
beta : -2.05286 ( 2.054 0.599764 )
Epeak [keV] : 59.6879 ( -32.4682 79.8258 )
Norm@50keV : 1.29036E-02 ( -0.0142715 22.3543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.13 using 59 PHA bins.
# Reduced chi-squared = 0.8205 for 55 degrees of freedom
# Null hypothesis probability = 8.263571e-01
Photon flux (15-150 keV) in 78.59 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30795e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6995 (-2.02273 2.49649)
R^2/D10^2 : 2.87787E-02 (-0.0124585 0.0204625)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.98 using 59 PHA bins.
# Reduced chi-squared = 0.8944 for 57 degrees of freedom
# Null hypothesis probability = 6.991173e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.026e-07 2.675e-08
25- 50 4.002e-07 7.619e-08
50-150 5.831e-07 1.655e-07
15-150 1.086e-06 1.914e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-81.5119 -199.363)
Norm : 0.961714 (-0.126004 0.126256)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.71 using 59 PHA bins.
# Reduced chi-squared = 0.8369 for 57 degrees of freedom
# Null hypothesis probability = 8.049867e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.882e-07 1.059e-07
25- 50 3.620e-07 1.991e-07
50-150 7.940e-07 4.393e-07
15-150 1.344e-06 7.395e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.1111 (-1.90687 2.39665)
R1^2/D10^2 : 5.05895E-02 (-0.0233321 0.0872605)
kT2 [keV] : 198.246 (-198.338 -198.339)
R2^2/D10^2 : 2.05746E-05 (-1.27287e-05 0.00122026)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.15 using 59 PHA bins.
# Reduced chi-squared = 0.8027 for 55 degrees of freedom
# Null hypothesis probability = 8.524008e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.255e-07 4.938e-08
25- 50 4.101e-07 1.884e-07
50-150 7.734e-07 2.457e-07
15-150 1.309e-06 3.980e-07
Peak spectrum fit
Power-law model
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.785376 ( -0.75154 0.621917 )
Norm@50keV : 6.63171E-03 ( -0.00270321 0.0024707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.268856e-01
Photon flux (15-150 keV) in 1 sec: 0.762588 ( -0.274281 0.287476 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.79759e-08 ( -2.53936e-08 2.55015e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.419020 ( -5.20913 -0.418638 )
Epeak [keV] : 301.924 ( -301.708 -301.708 )
Norm@50keV : 8.87883E-03 ( -0.00478269 0.648422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.18 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 56 degrees of freedom
# Null hypothesis probability = 2.954968e-01
Photon flux (15-150 keV) in 1 sec: 0.744157 ( -0.310505 0.300833 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.74765e-08 ( -2.63333e-08 2.57715e-08 ) ergs/cm2
Band function
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.787761 ( 0.787881 0.787881 )
beta : -0.785374 ( -0.621608 0.751582 )
Epeak [keV] : 15.1896 ( -15.1892 -15.1892 )
Norm@50keV : 9.81466E-03 ( -0.00557903 193702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.23 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 55 degrees of freedom
# Null hypothesis probability = 2.625082e-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] : 30.0539 (-10.3884 27.3863)
R^2/D10^2 : 1.12452E-02 (-0.0112452 0.0299914)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.65 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.134321e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.587e-09 1.055e-09
25- 50 9.798e-09 6.050e-09
50-150 6.247e-08 3.759e-08
15-150 7.386e-08 4.586e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.36199 (-1.18367 1.18336)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.71 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.006535e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.382e-09 5.225e-09
25- 50 1.612e-08 1.008e-08
50-150 3.536e-08 2.193e-08
15-150 5.987e-08 3.715e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.01667 (-4.82125 55.8745)
R1^2/D10^2 : 1.78175 (-1.92751 31.0864)
kT2 [keV] : 34.2472 (-13.0035 -34.2466)
R2^2/D10^2 : 7.37257E-03 (-0.00736107 0.0220563)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.38 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 55 degrees of freedom
# Null hypothesis probability = 2.875231e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.634e-09 3.655e-09
25- 50 1.095e-08 5.595e-09
50-150 6.280e-08 3.682e-08
15-150 7.939e-08 4.264e-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: 1.48704 ( -0.228022 0.226857 )
Norm@50keV : 1.88176E-03 ( -0.000249198 0.000248758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.28 using 59 PHA bins.
# Reduced chi-squared = 0.8646 for 57 degrees of freedom
# Null hypothesis probability = 7.565760e-01
Photon flux (15-150 keV) in 78.28 sec: 0.234109 ( -0.0322505 0.0324388 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40039e-06 ( -1.97896e-07 1.99864e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.413013 ( -1.51374 1.0811 )
Epeak [keV] : 72.9002 ( -18.9134 925.412 )
Norm@50keV : 6.54301E-03 ( -0.00654452 0.0305808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.46 using 59 PHA bins.
# Reduced chi-squared = 0.8296 for 56 degrees of freedom
# Null hypothesis probability = 8.144988e-01
Photon flux (15-150 keV) in 78.28 sec: 0.221636 ( -0.035036 0.034935 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28354e-06 ( -2.31904e-07 2.34824e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.131167 ( -1.27792 -0.155073 )
beta : -2.12981 ( 2.12922 0.634729 )
Epeak [keV] : 59.8092 ( -30.9637 76.1703 )
Norm@50keV : 1.34063E-02 ( -0.014801 22.2619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.29 using 59 PHA bins.
# Reduced chi-squared = 0.8235 for 55 degrees of freedom
# Null hypothesis probability = 8.217527e-01
Photon flux (15-150 keV) in 78.28 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2982e-06 ( -1.29766e-06 -2.20069e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.43e-07
S(50-100 keV) = 4.93e-07
T90 vs. Hardness ratio plot
T90 = 71.0199999809265 sec.
Hardness ratio (energy fluence ratio) = 1.43732
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.85818
Count Ratio (50-100 keV) / (15-25 keV) = 1.38954
Mask shadow pattern
IMX = 3.229335019026143E-01, IMY = 6.522179006549594E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 72.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 72.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 72.000000
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:
-239.000000 4.420000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9919 -15.6350 0.4 24.8 -73.2 9.8777 32.5 0.8 Sco X-1
254.3758 35.2345 5.8 57.6 -5.5 2.6508 2.0 7.6 Her X-1
255.9831 -37.8446 0.3 21.7 -137.0 10.0332 41.0 0.2 4U 1700-377
256.2726 -36.2811 36.4 20.4 -134.7 0.0747 0.3 11.6 GX 349+2
263.0478 -24.7931 11.7 8.3 -114.0 0.2276 1.0 3.6 GX 1+4
264.9683 -44.5840 0.0 24.8 -160.1 0.1218 0.5 12.6 4U 1735-44
268.3804 -1.5138 4.1 18.9 3.3 0.6556 2.8 3.7 SW J1753.5-0127
270.2865 -25.0413 2.4 4.8 -166.0 1.0366 4.7 2.3 GX 5-1
270.2052 -25.7159 7.9 5.5 -165.7 0.3212 1.5 5.5 GRS 1758-258
273.9080 -14.0526 3.7 7.0 37.5 0.7172 3.2 5.8 GX 17+2
275.8761 -30.2496 6.7 11.0 165.9 0.3857 1.7 7.5 H1820-303
284.9699 -25.0891 7.9 14.1 122.9 0.3344 1.5 10.7 HT1900.1-2455
288.8131 10.9489 1.3 36.0 41.7 3.9474 8.7 0.9 GRS 1915+105
263.1889 -33.9669 0.0 15.2 -145.6 0.2957 1.4 12.7 GX 354-0
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
4.420000 82.700600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1329 -15.5553 5.9 24.7 -72.9 -0.2755 -2.0 10.2 Sco X-1
254.4616 35.4128 3.6 57.8 -5.3 1.9908 3.2 4.2 Her X-1
256.0193 -37.9116 2.5 21.7 -137.2 0.5192 4.6 4.3 4U 1700-377
256.4486 -36.4203 4.6 20.4 -135.2 0.2827 2.5 0.7 GX 349+2
263.1650 -24.6753 4.4 8.2 -113.7 0.2855 2.6 9.5 GX 1+4
264.9683 -44.5840 0.0 24.8 -160.1 -0.2232 -1.9 12.6 4U 1735-44
268.2442 -1.5683 43.8 18.8 2.8 -0.0285 -0.3 10.2 SW J1753.5-0127
270.4105 -25.0334 11.8 4.8 -167.4 -0.1089 -1.0 7.4 GX 5-1
270.4953 -25.8644 0.0 5.6 -168.5 0.0489 0.4 12.7 GRS 1758-258
273.9409 -14.2010 5.3 6.8 38.3 -0.2215 -2.2 10.6 GX 17+2
276.1006 -30.3707 5.5 11.2 165.3 -0.2180 -2.1 9.1 H1820-303
285.1839 -24.8468 4.6 14.2 121.8 0.2760 2.5 9.2 HT1900.1-2455
288.8812 10.8548 3.6 35.9 41.9 0.6059 3.3 7.3 GRS 1915+105
262.7931 -33.7233 7.3 15.1 -144.0 -0.1711 -1.6 11.8 GX 354-0
259.9685 -30.3088 2.6 13.9 -128.1 0.4902 4.5 ------ UNKNOWN
235.8799 -7.2988 1.2 36.0 -63.7 2.0269 9.6 ------ UNKNOWN
237.1587 23.6038 3.0 54.7 -28.0 1.7362 3.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
140.300620 317.700640
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9802 -15.6356 0.3 12.2 121.3 7.0229 41.3 0.3 Sco X-1
254.4362 35.3569 2.2 46.1 8.4 1.8784 5.2 1.4 Her X-1
255.9744 -37.8582 0.6 35.5 139.6 6.2465 19.4 1.0 4U 1700-377
256.6068 -36.3633 4.4 34.7 137.3 0.8321 2.6 9.0 GX 349+2
262.9938 -24.6152 7.3 31.1 114.2 0.4785 1.6 7.9 GX 1+4
264.6891 -44.5252 5.5 44.8 138.2 1.3530 2.1 5.1 4U 1735-44
268.4622 -1.3461 4.7 33.0 68.5 0.8074 2.4 8.5 SW J1753.5-0127
270.2484 -24.9569 6.2 37.2 109.7 0.8310 1.9 7.6 GX 5-1
270.4801 -25.6320 11.4 37.7 110.5 -0.4780 -1.0 11.7 GRS 1758-258
274.0056 -14.0362 609.1 38.0 90.8 -0.0117 -0.0 0.0 GX 17+2
263.1493 -33.8896 19.2 36.6 127.8 -0.2388 -0.6 8.6 GX 354-0
272.0099 -27.5569 2.7 39.7 112.5 2.6250 4.3 ------ UNKNOWN
243.4426 50.5060 2.3 58.2 -7.0 4.6057 5.0 ------ UNKNOWN
190.4369 -50.5870 3.9 57.3 -160.1 2.9897 3.0 ------ UNKNOWN
195.8653 1.1322 3.1 40.8 -92.4 3.3326 3.7 ------ UNKNOWN
Plot creation:
Thu Jun 11 22:48:59 EDT 2015