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
249.3631 -23.9605 0.0101 32.9980 -26.1171 1.5694920 19.048 TRIG_00512164
Foreground time interval of the image:
-11.004 19.776 (delta_t = 30.780 [sec])
Background time interval of the image:
-239.072 -11.004 (delta_t = 228.068 [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 -11.004 sec. to 19.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22283 ( -0.133735 0.131331 )
Norm@50keV : 3.60044E-03 ( -0.000276069 0.000275668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.15 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.970539e-01
Photon flux (15-150 keV) in 30.78 sec: 0.424020 ( -0.0345845 0.0347579 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11723e-06 ( -8.93072e-08 8.95944e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.004 sec. to 19.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.365091 ( -0.681221 0.583959 )
Epeak [keV] : 108.100 ( -24.8635 103.261 )
Norm@50keV : 8.66376E-03 ( -0.00382019 0.00815744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9370 for 56 degrees of freedom
# Null hypothesis probability = 6.092783e-01
Photon flux (15-150 keV) in 30.78 sec: 0.404614 ( -0.036904 0.037024 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06877e-06 ( -9.70247e-08 9.66184e-08 ) ergs/cm2
Band function
Time interval is from -11.004 sec. to 19.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.365024 ( -0.430871 0.867202 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 108.081 ( -17.4898 103.239 )
Norm@50keV : 8.66451E-03 ( -0.0038202 0.00816348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9540 for 55 degrees of freedom
# Null hypothesis probability = 5.718742e-01
Photon flux (15-150 keV) in 30.78 sec: 0.408864 ( ) 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] : 19.5074 (-1.72989 1.9655)
R^2/D10^2 : 2.12153E-02 (-0.00587767 0.00787851)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.99 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.717099e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.837e-08 7.372e-09
25- 50 2.369e-07 2.932e-08
50-150 6.658e-07 8.665e-08
15-150 9.511e-07 8.803e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.80901 (-0.139593 0.139556)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.20 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.257706e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.386e-07 1.376e-08
25- 50 2.667e-07 5.128e-08
50-150 5.849e-07 1.988e-07
15-150 9.901e-07 2.715e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.52947 (-3.1609 5.03111)
R1^2/D10^2 : 0.203847 (-0.150188 1.24077)
kT2 [keV] : 25.1352 (-4.32812 13.9419)
R2^2/D10^2 : 7.87737E-03 (-0.0064271 0.00820187)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.60 using 59 PHA bins.
# Reduced chi-squared = 0.9564 for 55 degrees of freedom
# Null hypothesis probability = 5.668550e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.779e-08 4.349e-08
25- 50 2.472e-07 1.026e-07
50-150 7.272e-07 3.154e-07
15-150 1.062e-06 3.606e-07
Peak spectrum fit
Power-law model
Time interval is from 2.860 sec. to 3.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39693 ( -0.414464 0.408759 )
Norm@50keV : 6.01987E-03 ( -0.00147531 0.00147376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.10 using 59 PHA bins.
# Reduced chi-squared = 0.7035 for 57 degrees of freedom
# Null hypothesis probability = 9.563336e-01
Photon flux (15-150 keV) in 1 sec: 0.732573 ( -0.188033 0.190126 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.82063e-08 ( -1.50628e-08 1.52551e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.860 sec. to 3.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.86190E-02 ( -2.97618 1.06336 )
Epeak [keV] : 78.0907 ( -21.5248 -78.0907 )
Norm@50keV : 2.59964E-02 ( -0.0259964 0.473638 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.44 using 59 PHA bins.
# Reduced chi-squared = 0.6864 for 56 degrees of freedom
# Null hypothesis probability = 9.647816e-01
Photon flux (15-150 keV) in 1 sec: 0.685236 ( -0.192096 0.200958 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43697e-08 ( -1.57787e-08 1.62317e-08 ) ergs/cm2
Band function
Time interval is from 2.860 sec. to 3.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.80561E-02 ( -1.37593 3.0486 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 78.0593 ( -24.571 120.267 )
Norm@50keV : 2.60183E-02 ( -0.0260183 0.469227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.44 using 59 PHA bins.
# Reduced chi-squared = 0.6988 for 55 degrees of freedom
# Null hypothesis probability = 9.561683e-01
Photon flux (15-150 keV) in 1 sec: 0.703878 ( ) 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] : 17.2633 (-4.10199 5.76009)
R^2/D10^2 : 5.42755E-02 (-0.0344857 0.0861501)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.35 using 59 PHA bins.
# Reduced chi-squared = 0.6903 for 57 degrees of freedom
# Null hypothesis probability = 9.640346e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.280e-09 1.741e-09
25- 50 1.469e-08 7.446e-09
50-150 3.141e-08 1.708e-08
15-150 4.938e-08 2.186e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-107.119 -199.363)
Norm : 3.07936 (-0.751949 0.752026)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.90 using 59 PHA bins.
# Reduced chi-squared = 0.7000 for 57 degrees of freedom
# Null hypothesis probability = 9.584820e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.668e-09 4.570e-09
25- 50 1.475e-08 8.985e-09
50-150 3.235e-08 1.892e-08
15-150 5.477e-08 3.135e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.35703 (-4.35766 188.297)
R1^2/D10^2 : 2.44189 (-2.44033 -2.44033)
kT2 [keV] : 19.2359 (-5.20969 -19.2362)
R2^2/D10^2 : 3.51243E-02 (-0.0351221 0.0760347)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.18 using 59 PHA bins.
# Reduced chi-squared = 0.6942 for 55 degrees of freedom
# Null hypothesis probability = 9.589899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.854e-09 3.561e-09
25- 50 1.385e-08 7.910e-09
50-150 3.366e-08 2.117e-08
15-150 5.337e-08 2.953e-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: 1.22283 ( -0.133735 0.131331 )
Norm@50keV : 3.60044E-03 ( -0.000276069 0.000275668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.15 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.970539e-01
Photon flux (15-150 keV) in 30.78 sec: 0.424020 ( -0.0345845 0.0347579 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11723e-06 ( -8.93072e-08 8.95944e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.365091 ( -0.681221 0.583959 )
Epeak [keV] : 108.100 ( -24.8635 103.261 )
Norm@50keV : 8.66376E-03 ( -0.00382019 0.00815744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9370 for 56 degrees of freedom
# Null hypothesis probability = 6.092783e-01
Photon flux (15-150 keV) in 30.78 sec: 0.404614 ( -0.036904 0.037024 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06877e-06 ( -9.70247e-08 9.66184e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.365024 ( -0.430871 0.867202 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 108.081 ( -17.4898 103.239 )
Norm@50keV : 8.66451E-03 ( -0.0038202 0.00816348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9540 for 55 degrees of freedom
# Null hypothesis probability = 5.718742e-01
Photon flux (15-150 keV) in 30.78 sec: 0.408864 ( ) 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) = 2.38e-07
S(50-100 keV) = 4.08e-07
T90 vs. Hardness ratio plot
T90 = 26.7999999523163 sec.
Hardness ratio (energy fluence ratio) = 1.71429
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.99467
Count Ratio (50-100 keV) / (15-25 keV) = 1.99104
Mask shadow pattern
IMX = 5.830556130485854E-01, IMY = 2.858521460019826E-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:
-239.072000 -11.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9867 -15.6381 0.4 27.0 -11.9 7.4470 32.2 0.4 Sco X-1
254.4603 35.3411 2.5 27.8 131.5 1.2841 4.6 0.2 Her X-1
255.9904 -37.8301 2.4 45.7 -38.8 2.3248 4.9 0.9 4U 1700-377
256.5503 -36.3908 4.7 44.2 -39.3 1.0615 2.5 5.9 GX 349+2
262.9382 -24.7023 22.5 32.8 -49.0 0.1521 0.5 4.7 GX 1+4
268.4645 -1.4287 3.1 13.6 -89.1 0.8879 3.7 6.0 SW J1753.5-0127
270.2099 -25.0913 2.6 34.9 -60.3 1.5636 4.4 4.1 GX 5-1
270.2510 -25.7017 5.1 35.4 -60.0 0.8255 2.3 3.7 GRS 1758-258
274.0141 -14.0103 2.5 26.7 -76.8 1.3552 4.6 1.6 GX 17+2
275.9459 -30.3935 5.7 41.7 -64.4 1.5321 2.0 1.9 H1820-303
288.7876 10.9523 0.8 30.1 -139.8 3.9421 15.3 0.8 GRS 1915+105
299.5981 35.1200 5.8 46.5 -173.6 0.7975 2.0 4.9 Cyg X-1
308.1301 40.8629 24.8 55.0 -176.7 0.3939 0.5 5.5 Cyg X-3
263.1256 -33.9091 4.1 42.0 -47.3 1.2509 2.8 8.1 GX 354-0
317.6917 29.8915 3.8 59.5 -161.7 4.9696 3.1 ------ UNKNOWN
275.2747 -33.4952 2.8 44.3 -61.7 4.1590 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-11.004000 19.776000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9427 -15.7267 6.6 27.1 -11.9 0.1298 1.8 5.6 Sco X-1
254.5613 35.2833 25.1 27.7 131.7 0.0428 0.5 6.2 Her X-1
256.0057 -37.7763 3.4 45.7 -38.8 0.5122 3.4 4.2 4U 1700-377
256.4325 -36.4248 113.0 44.3 -39.2 0.0147 0.1 0.2 GX 349+2
263.2006 -24.7025 31.2 32.9 -49.5 0.0349 0.4 10.8 GX 1+4
268.5772 -1.4448 0.0 13.7 -89.4 -0.1156 -1.6 12.6 SW J1753.5-0127
270.3578 -24.9671 5.7 34.8 -60.6 -0.2281 -2.0 7.8 GX 5-1
270.3786 -25.6332 28.8 35.4 -60.2 -0.0478 -0.4 7.8 GRS 1758-258
274.0324 -14.2308 0.0 26.9 -76.6 0.1307 1.5 11.8 GX 17+2
275.7249 -30.4040 5.9 41.7 -64.1 0.4690 1.9 10.6 H1820-303
288.7019 10.8371 9.8 30.0 -139.6 0.1009 1.2 8.6 GRS 1915+105
299.5647 35.3140 4.8 46.6 -173.8 -0.3204 -2.4 6.9 Cyg X-1
308.1788 40.8825 4.5 55.0 -176.7 -0.6535 -2.5 5.2 Cyg X-3
263.0143 -33.8528 5.2 41.9 -47.2 -0.3313 -2.2 1.7 GX 354-0
221.3393 26.2064 2.4 39.7 80.7 1.3009 4.8 ------ UNKNOWN
252.1237 26.6952 2.8 19.8 121.6 0.3024 4.1 ------ UNKNOWN
249.3630 -23.9605 0.6 33.0 -26.1 1.5695 19.0 ------ UNKNOWN
264.0835 -15.5535 2.2 24.0 -54.9 0.4133 5.3 ------ UNKNOWN
317.1054 27.3263 1.9 58.6 -158.8 2.2042 6.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
103.028600 962.961300
1663.928000 1844.138000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9807 -15.6451 0.3 9.3 146.6 30.7929 45.6 0.3 Sco X-1
255.9700 -37.8446 0.4 15.0 -26.9 18.4065 26.6 0.8 4U 1700-377
256.4377 -36.4333 2.0 13.9 -30.7 4.0109 5.8 0.6 GX 349+2
262.9132 -24.7433 3.9 12.4 -90.0 2.0721 2.9 5.2 GX 1+4
264.5451 -44.3153 0.0 23.8 -34.0 -0.5665 -0.8 11.7 4U 1735-44
268.3178 -1.4396 3.3 29.1 -144.4 2.5646 3.5 3.1 SW J1753.5-0127
270.2349 -25.0929 2.1 19.0 -88.6 4.0297 5.5 2.8 GX 5-1
270.1361 -25.6738 102.3 18.9 -86.8 0.0890 0.1 9.9 GRS 1758-258
273.9810 -14.1512 3.1 25.2 -114.8 3.3794 3.7 7.0 GX 17+2
275.7623 -30.4810 5.7 24.3 -75.0 1.7729 2.0 10.8 H1820-303
285.0113 -25.0527 11.7 32.4 -86.9 -1.2523 -1.0 8.0 HT1900.1-2455
262.8316 -33.9801 8.8 15.4 -52.9 0.9428 1.3 11.7 GX 354-0
257.7068 17.8912 2.7 42.7 -174.5 4.9432 4.3 ------ UNKNOWN
256.8236 -14.8804 3.7 11.5 -147.3 1.9769 3.1 ------ UNKNOWN
269.7219 30.3061 3.7 57.7 -165.5 11.5314 3.2 ------ UNKNOWN
Plot creation:
Sat May 30 20:35:55 EDT 2015