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
317.3749 -63.9818 0.0101 41.7686 154.1918 6.1354390 18.967 TRIG_00500914
Foreground time interval of the image:
-14.164 117.392 (delta_t = 131.556 [sec])
Background time interval of the image:
-143.579 -14.164 (delta_t = 129.415 [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 12.160000
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 12.160000
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 12.160000
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 -14.164 sec. to 117.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58146 ( -0.107595 0.107752 )
Norm@50keV : 3.23498E-03 ( -0.000190983 0.000190734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.09 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.409102e-02
Photon flux (15-150 keV) in 131.6 sec: 0.413357 ( -0.0264442 0.0265625 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99069e-06 ( -2.4735e-07 2.48037e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.164 sec. to 117.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46859 ( -0.451553 0.209928 )
Epeak [keV] : 247.088 ( -247.834 -247.834 )
Norm@50keV : 3.66774E-03 ( -0.000807036 0.00231685 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.89 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 56 degrees of freedom
# Null hypothesis probability = 6.423651e-02
Photon flux (15-150 keV) in 131.6 sec: 0.410490 ( -0.02836 0.028279 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.96258e-06 ( -2.73517e-07 2.57239e-07 ) ergs/cm2
Band function
Time interval is from -14.164 sec. to 117.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.876722 ( 0.968245 0.968245 )
beta : -1.67293 ( 1.66872 0.207886 )
Epeak [keV] : 60.2789 ( -58.7958 455.457 )
Norm@50keV : 8.38117E-03 ( -0.00890089 1698.92 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.81 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 55 degrees of freedom
# Null hypothesis probability = 6.352722e-02
Photon flux (15-150 keV) in 131.6 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] : 15.1556 ( )
R^2/D10^2 : 4.31276E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 139.24 using 59 PHA bins.
# Reduced chi-squared = 2.4429 for 57 degrees of freedom
# Null hypothesis probability = 7.807671e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.725e-07 3.494e-08
25- 50 1.093e-06 8.337e-08
50-150 1.716e-06 1.816e-07
15-150 3.082e-06 2.264e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.214 (-52.5039 -199.238)
Norm : 1.66777 (-0.097955 0.114006)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.41 using 59 PHA bins.
# Reduced chi-squared = 1.288 for 57 degrees of freedom
# Null hypothesis probability = 7.065703e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.466e-07 3.987e-08
25- 50 1.051e-06 7.350e-08
50-150 2.305e-06 5.067e-07
15-150 3.903e-06 6.843e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.80401 (-1.6983 1.80699)
R1^2/D10^2 : 0.219274 (-0.0951502 0.212929)
kT2 [keV] : 36.0233 (-10.3578 35.2015)
R2^2/D10^2 : 1.55888E-03 (-0.00129745 0.00349397)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.18 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 55 degrees of freedom
# Null hypothesis probability = 3.665704e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.673e-07 9.074e-08
25- 50 1.128e-06 1.750e-07
50-150 2.351e-06 9.955e-07
15-150 3.946e-06 1.148e-06
Peak spectrum fit
Power-law model
Time interval is from 27.260 sec. to 28.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10998 ( -0.334209 0.318428 )
Norm@50keV : 1.35121E-02 ( -0.00244752 0.00239838 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.24 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.654418e-01
Photon flux (15-150 keV) in 1 sec: 1.56886 ( -0.297823 0.302777 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40824e-07 ( -2.46498e-08 2.47379e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.260 sec. to 28.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10420 ( -1.60434 2.0056 )
Epeak [keV] : 9981.89 ( )
Norm@50keV : 1.35836E-02 ( -0.00230385 0.0444498 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.24 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 56 degrees of freedom
# Null hypothesis probability = 2.359791e-01
Photon flux (15-150 keV) in 1 sec: 1.56652 ( -0.33903 0.30398 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40669e-07 ( -2.5081e-08 2.4865e-08 ) ergs/cm2
Band function
Time interval is from 27.260 sec. to 28.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.909696 ( 0.909626 0.909626 )
beta : -1.11000 ( 1.10998 0.334531 )
Epeak [keV] : 43.7378 ( -43.7924 -43.7924 )
Norm@50keV : 2.38094E-02 ( -0.0139343 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.24 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.081854e-01
Photon flux (15-150 keV) in 1 sec: 1.55933 ( ) 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] : 24.7006 (-4.62652 6.55274)
R^2/D10^2 : 3.76425E-02 (-0.019733 0.0361258)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.23 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.666283e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.015e-09 1.590e-09
25- 50 2.264e-08 7.060e-09
50-150 1.026e-07 3.471e-08
15-150 1.292e-07 3.775e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.82069 (-1.20039 1.19991)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.79 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.189636e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.700e-08 9.990e-09
25- 50 3.270e-08 1.865e-08
50-150 7.172e-08 4.104e-08
15-150 1.214e-07 6.810e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.15075 (-1.45152 2.14644)
R1^2/D10^2 : 12.6001 (-10.9449 103.292)
kT2 [keV] : 28.6407 (-6.02468 10.0739)
R2^2/D10^2 : 2.22660E-02 (-0.0133152 0.0304146)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.27 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 55 degrees of freedom
# Null hypothesis probability = 3.559141e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.661e-08 9.446e-09
25- 50 2.325e-08 1.019e-08
50-150 1.048e-07 5.534e-08
15-150 1.447e-07 6.582e-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: 1.58146 ( -0.107595 0.107752 )
Norm@50keV : 3.23498E-03 ( -0.000190983 0.000190734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.09 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.409102e-02
Photon flux (15-150 keV) in 131.6 sec: 0.413357 ( -0.0264442 0.0265625 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99069e-06 ( -2.4735e-07 2.48037e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46859 ( -0.451553 0.209928 )
Epeak [keV] : 247.088 ( -247.834 -247.834 )
Norm@50keV : 3.66774E-03 ( -0.000807036 0.00231685 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.89 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 56 degrees of freedom
# Null hypothesis probability = 6.423651e-02
Photon flux (15-150 keV) in 131.6 sec: 0.410490 ( -0.02836 0.028279 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.96258e-06 ( -2.73517e-07 2.57239e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.876722 ( 0.968245 0.968245 )
beta : -1.67293 ( 1.66872 0.207886 )
Epeak [keV] : 60.2789 ( -58.7958 436.754 )
Norm@50keV : 8.38117E-03 ( -0.00890089 1698.92 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.81 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 55 degrees of freedom
# Null hypothesis probability = 6.352722e-02
Photon flux (15-150 keV) in 131.6 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) = 1.03e-06
S(50-100 keV) = 1.37e-06
T90 vs. Hardness ratio plot
T90 = 102.839999973774 sec.
Hardness ratio (energy fluence ratio) = 1.3301
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.40895
Count Ratio (50-100 keV) / (15-25 keV) = 1.08713
Mask shadow pattern
IMX = -8.040348780338894E-01, IMY = -3.888279892617332E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000
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:
-143.579400 -14.164000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.3239 -62.7620 5.9 46.5 -134.4 -0.8144 -2.0 9.2 GX 301-2
244.9791 -15.6398 0.3 26.7 -17.9 4.5786 36.3 0.0 Sco X-1
255.9411 -37.7875 2.8 2.5 -13.4 0.5012 4.1 4.0 4U 1700-377
256.5655 -36.3502 4.3 3.8 1.8 0.3241 2.7 7.7 GX 349+2
263.1174 -24.7446 3.7 16.2 28.8 0.3713 3.1 5.9 GX 1+4
264.9845 -44.5240 3.6 7.3 138.9 0.3920 3.2 11.3 4U 1735-44
268.4106 -1.5157 3.3 39.9 26.7 0.7538 3.5 4.6 SW J1753.5-0127
270.2413 -24.9786 3.4 18.7 48.8 0.4863 3.4 6.5 GX 5-1
270.2718 -25.6941 3.5 18.1 50.2 0.4577 3.3 3.4 GRS 1758-258
273.9249 -14.0161 2.6 30.0 43.1 0.7658 4.4 4.9 GX 17+2
275.7726 -30.4415 3.7 18.0 72.2 0.4271 3.1 9.1 H1820-303
284.9800 -24.8406 7.7 27.8 74.2 0.2729 1.5 5.7 HT1900.1-2455
262.8081 -33.8471 9.1 7.7 46.5 0.1528 1.3 9.0 GX 354-0
292.1743 -26.2436 2.6 32.1 84.3 1.1280 4.4 ------ UNKNOWN
278.1896 -11.2532 2.5 34.3 47.6 1.0354 4.7 ------ UNKNOWN
292.4550 -53.9240 2.1 27.3 141.2 0.8666 5.5 ------ UNKNOWN
7.8273 -79.4914 2.9 54.2 176.9 1.8702 3.9 ------ UNKNOWN
25.0285 -79.2431 2.9 56.9 178.9 3.0450 4.0 ------ UNKNOWN
278.9292 -74.0923 2.8 35.5 179.0 0.6248 4.1 ------ UNKNOWN
255.1852 -41.6732 1.7 2.1 -127.5 0.7892 6.9 ------ UNKNOWN
243.1483 -52.4012 2.3 15.6 -137.6 0.6268 5.1 ------ UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.164000 117.392000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6431 -62.8257 9.8 46.4 -134.5 0.5296 1.2 3.3 GX 301-2
244.9792 -15.6416 477.4 26.7 -17.9 -0.0039 -0.0 0.1 Sco X-1
255.9631 -37.7362 4.3 2.6 -12.6 -0.4042 -2.6 6.6 4U 1700-377
256.4464 -36.4811 7.8 3.7 0.1 0.2296 1.5 3.5 GX 349+2
263.1976 -24.8382 8.0 16.1 29.2 -0.2202 -1.5 11.7 GX 1+4
264.5272 -44.4492 5.6 6.9 139.9 0.3215 2.1 9.2 4U 1735-44
268.2749 -1.5072 5.8 39.9 26.5 -0.5869 -2.0 6.5 SW J1753.5-0127
270.2787 -24.9301 5.1 18.8 48.8 -0.3937 -2.2 9.0 GX 5-1
270.4642 -25.7160 7.2 18.2 50.7 -0.2781 -1.6 8.9 GRS 1758-258
274.1115 -14.1574 13.0 29.9 43.6 0.2049 0.9 9.5 GX 17+2
275.7982 -30.4865 4.7 18.0 72.4 -0.4444 -2.5 9.7 H1820-303
285.0281 -25.0685 47.6 27.7 74.6 0.0596 0.2 8.9 HT1900.1-2455
263.1201 -33.6582 6.4 8.0 47.2 0.2891 1.8 12.4 GX 354-0
268.2968 11.0475 2.0 52.2 22.9 4.3972 5.8 ------ UNKNOWN
317.3748 -63.9817 0.6 41.8 154.2 6.1351 19.0 ------ UNKNOWN
214.0730 -15.4829 2.3 44.8 -60.2 3.0860 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
364.220600 962.630600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9701 -37.8606 92.4 44.2 -7.0 0.0634 0.1 1.3 4U 1700-377
256.2684 -36.3854 5.1 45.3 -5.6 1.2882 2.3 8.4 GX 349+2
263.1508 -24.7520 4.9 52.5 8.9 2.3496 2.4 7.7 GX 1+4
264.7929 -44.4324 2.7 35.0 -4.5 1.5854 4.3 2.4 4U 1735-44
270.4730 -25.0911 3.2 49.3 16.4 3.1685 3.6 10.3 GX 5-1
270.2994 -25.6459 6.5 48.8 15.9 1.4656 1.8 5.8 GRS 1758-258
275.8005 -30.3794 3.1 42.5 19.2 1.9748 3.7 6.5 H1820-303
285.0595 -24.9608 8.7 44.3 33.3 0.9949 1.3 2.7 HT1900.1-2455
262.9822 -33.8358 12.9 44.5 2.9 -0.5096 -0.9 0.3 GX 354-0
342.3995 -67.9758 2.6 10.9 -160.3 1.2861 4.4 ------ UNKNOWN
47.0373 -35.6269 4.7 58.3 -175.7 6.2982 2.5 ------ UNKNOWN
255.2031 -41.6368 1.1 41.4 -10.9 4.7939 10.9 ------ UNKNOWN
243.1447 -52.4447 2.3 38.3 -31.6 2.1875 5.1 ------ UNKNOWN
60.6016 -69.6942 3.2 36.1 -137.8 1.6660 3.6 ------ UNKNOWN
237.2117 -46.7414 3.1 45.1 -30.5 2.1128 3.7 ------ UNKNOWN
84.3683 -62.9635 3.6 47.1 -132.5 4.2072 3.2 ------ UNKNOWN
90.4126 -63.3865 2.2 48.0 -129.0 8.8205 5.3 ------ UNKNOWN
Plot creation:
Sat May 30 21:43:55 EDT 2015