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
237.6658 -46.2376 0.0020 34.1186 -179.1173 18.1301494 95.095 TRIG_00457330
Foreground time interval of the image:
-3.144 12.157 (delta_t = 15.301 [sec])
Background time interval of the image:
-239.144 -3.144 (delta_t = 236.000 [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 0.128000
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 0.128000
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 0.128000
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 -3.144 sec. to 20.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62609 ( -0.0271605 0.0271072 )
Norm@50keV : 5.35106E-02 ( -0.000809795 0.000809292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.48 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 57 degrees of freedom
# Null hypothesis probability = 1.837607e-02
Photon flux (15-150 keV) in 24 sec: 6.93311 ( -0.131166 0.131679 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19742e-05 ( -1.77148e-07 1.77148e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.144 sec. to 20.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25390 ( -0.117752 0.114996 )
Epeak [keV] : 119.804 ( -14.9703 26.5974 )
Norm@50keV : 7.68032E-02 ( -0.00792599 0.00903762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.57 using 59 PHA bins.
# Reduced chi-squared = 0.8853 for 56 degrees of freedom
# Null hypothesis probability = 7.151320e-01
Photon flux (15-150 keV) in 24 sec: 6.69428 ( -0.1459 0.14694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17768e-05 ( -1.87584e-07 1.8744e-07 ) ergs/cm2
Band function
Time interval is from -3.144 sec. to 20.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.679326 ( -0.386444 0.65894 )
beta : -1.76816 ( -0.0733594 0.0582313 )
Epeak [keV] : 63.1851 ( -14.8017 22.7976 )
Norm@50keV : 0.162872 ( -0.0681103 0.261627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.57 using 59 PHA bins.
# Reduced chi-squared = 0.7558 for 55 degrees of freedom
# Null hypothesis probability = 9.094649e-01
Photon flux (15-150 keV) in 24 sec: 6.54616 ( 0.45384 -0.16976 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16741e-05 ( -1.1674e-05 -1.92792e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.7754 ( )
R^2/D10^2 : 0.400772 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 935.64 using 59 PHA bins.
# Reduced chi-squared = 16.415 for 57 degrees of freedom
# Null hypothesis probability = 3.341459e-159
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.109e-07 1.944e-08
25- 50 2.799e-06 6.480e-08
50-150 6.397e-06 1.380e-07
15-150 9.807e-06 1.452e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.732 ( )
Norm : 27.6091 (-0.423992 0.566698)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.88 using 59 PHA bins.
# Reduced chi-squared = 0.8575 for 57 degrees of freedom
# Null hypothesis probability = 7.694523e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.649e-06 3.336e-08
25- 50 3.173e-06 6.240e-08
50-150 6.955e-06 1.224e-07
15-150 1.178e-05 2.244e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.66093 (-0.484114 0.500046)
R1^2/D10^2 : 3.41135 (-0.571501 0.72526)
kT2 [keV] : 29.7996 (-1.70673 2.04037)
R2^2/D10^2 : 4.74821E-02 (-0.0105083 0.0121384)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.723755e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.330e-06 7.836e-08
25- 50 3.318e-06 9.120e-08
50-150 6.943e-06 2.124e-07
15-150 1.159e-05 2.796e-07
Peak spectrum fit
Power-law model
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38766 ( -0.0308685 0.030819 )
Norm@50keV : 0.443734 ( -0.00785242 0.00784781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.24 using 59 PHA bins.
# Reduced chi-squared = 1.425 for 57 degrees of freedom
# Null hypothesis probability = 1.918626e-02
Photon flux (15-150 keV) in 1 sec: 53.8892 ( -1.08401 1.08655 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29861e-06 ( -7.58356e-08 7.58483e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.984887 ( -0.13273 0.129127 )
Epeak [keV] : 151.992 ( -23.0215 42.2549 )
Norm@50keV : 0.656165 ( -0.0755286 0.0875329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.46 using 59 PHA bins.
# Reduced chi-squared = 0.9189 for 56 degrees of freedom
# Null hypothesis probability = 6.473052e-01
Photon flux (15-150 keV) in 1 sec: 52.4137 ( -1.1574 1.1628 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24486e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.984868 ( -0.101757 0.179674 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 151.967 ( -23.0125 42.2524 )
Norm@50keV : 0.656121 ( -0.0755324 0.0875597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.46 using 59 PHA bins.
# Reduced chi-squared = 0.9356 for 55 degrees of freedom
# Null hypothesis probability = 6.108287e-01
Photon flux (15-150 keV) in 1 sec: 51.7619 ( -44.7619 -1.2816 ) 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] : 19.4843 ( )
R^2/D10^2 : 2.54972 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 628.83 using 59 PHA bins.
# Reduced chi-squared = 11.032 for 57 degrees of freedom
# Null hypothesis probability = 2.589020e-97
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.885e-07 6.800e-09
25- 50 9.226e-07 2.360e-08
50-150 2.586e-06 6.850e-08
15-150 3.697e-06 7.000e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 230.089 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 187.87 using 59 PHA bins.
# Reduced chi-squared = 3.2960 for 57 degrees of freedom
# Null hypothesis probability = 7.016064e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.729e-07 1.140e-08
25- 50 1.102e-06 2.050e-08
50-150 2.417e-06 4.600e-08
15-150 4.092e-06 7.950e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.72700 (-0.623907 0.654712)
R1^2/D10^2 : 22.8450 (-4.60064 6.16807)
kT2 [keV] : 31.0808 (-1.91874 2.34064)
R2^2/D10^2 : 0.409996 (-0.09498 0.108846)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.26 using 59 PHA bins.
# Reduced chi-squared = 0.9139 for 55 degrees of freedom
# Null hypothesis probability = 6.558132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.937e-07 2.700e-08
25- 50 1.053e-06 3.800e-08
50-150 2.784e-06 1.035e-07
15-150 4.232e-06 1.215e-07
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: 1.61700 ( -0.0261853 0.0261369 )
Norm@50keV : 7.98205E-02 ( -0.00118522 0.00118445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.07 using 59 PHA bins.
# Reduced chi-squared = 1.615 for 57 degrees of freedom
# Null hypothesis probability = 2.242604e-03
Photon flux (15-150 keV) in 15.3 sec: 10.3120 ( -0.190884 0.191639 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13984e-05 ( -1.64923e-07 1.6492e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17512 ( -0.115496 0.112898 )
Epeak [keV] : 112.689 ( -11.4046 18.0862 )
Norm@50keV : 0.122131 ( -0.0122785 0.013942 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.85 using 59 PHA bins.
# Reduced chi-squared = 0.8008 for 56 degrees of freedom
# Null hypothesis probability = 8.575397e-01
Photon flux (15-150 keV) in 15.3 sec: 9.89767 ( -0.21066 0.21223 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1195e-05 ( -1.72997e-07 1.72951e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.666506 ( -0.39429 0.56296 )
beta : -1.78840 ( -0.104401 0.062912 )
Epeak [keV] : 66.5917 ( -14.3857 26.5674 )
Norm@50keV : 0.235531 ( -0.0963732 0.282882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.48 using 59 PHA bins.
# Reduced chi-squared = 0.7360 for 55 degrees of freedom
# Null hypothesis probability = 9.284569e-01
Photon flux (15-150 keV) in 15.3 sec: 9.70233 ( -2.70233 -0.24632 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11037e-05 ( -1.11036e-05 -1.78199e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.14e-06
S(50-100 keV) = 4.07e-06
T90 vs. Hardness ratio plot
T90 = 13 sec.
Hardness ratio (energy fluence ratio) = 1.29618
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.51204
Count Ratio (50-100 keV) / (15-25 keV) = 1.12729
Mask shadow pattern
IMX = -6.774431003054280E-01, IMY = 1.043730559904359E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
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:
-239.144000 -3.144000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9759 -15.6349 0.2 9.4 -114.0 12.6353 49.6 0.4 Sco X-1
254.4514 35.3461 80.9 50.6 -20.6 0.0889 0.1 0.4 Her X-1
255.8180 -37.9106 6.1 22.7 157.4 -0.5239 -1.9 8.9 4U 1700-377
256.3149 -36.4169 3.3 21.2 156.1 0.9848 3.5 5.8 GX 349+2
263.0014 -24.7345 1.5 12.3 121.7 1.7531 7.7 0.8 GX 1+4
264.9986 -44.3398 0.0 30.4 145.1 0.4483 1.2 12.8 4U 1735-44
268.3392 -1.4427 6.2 19.3 25.2 0.5060 1.9 1.8 SW J1753.5-0127
270.1788 -25.0501 4.0 17.5 106.2 0.8694 2.9 6.0 GX 5-1
270.4883 -25.6987 7.5 18.1 107.5 0.4606 1.5 10.4 GRS 1758-258
273.9782 -14.0630 2.5 18.7 68.6 1.3364 4.7 2.3 GX 17+2
275.7514 -30.4809 4.2 24.6 111.6 1.0459 2.7 11.3 H1820-303
284.9912 -25.0456 6.7 30.0 93.6 0.8327 1.7 7.9 HT1900.1-2455
288.8191 10.9305 2.4 42.7 33.9 3.1533 4.7 1.5 GRS 1915+105
263.0316 -33.8163 4.0 20.0 139.2 0.8734 2.9 2.4 GX 354-0
213.5264 -54.4899 2.7 50.5 -170.6 2.7319 4.2 ------ UNKNOWN
205.0959 -30.0001 3.2 47.7 -137.2 2.9929 3.7 ------ UNKNOWN
197.0256 -37.2077 3.8 55.3 -145.3 6.2462 3.0 ------ UNKNOWN
204.4254 -23.8536 3.0 47.9 -128.9 5.5170 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.144000 12.156590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8959 -15.4444 0.0 9.5 -112.8 -0.2589 -1.8 12.7 Sco X-1
254.4768 35.4663 8.1 50.7 -20.6 0.5486 1.4 7.5 Her X-1
256.2242 -37.7494 0.0 22.5 156.6 -0.3509 -2.0 12.6 4U 1700-377
256.4726 -36.5889 12.0 21.4 155.8 -0.1698 -1.0 10.1 GX 349+2
263.0053 -24.7902 6.4 12.3 121.8 0.2656 1.8 2.7 GX 1+4
264.5793 -44.5732 12.3 30.5 145.8 -0.1998 -0.9 10.2 4U 1735-44
268.5464 -1.3585 0.0 19.5 25.5 0.1109 0.7 12.1 SW J1753.5-0127
270.1244 -25.0563 17.8 17.5 106.3 0.1224 0.6 8.8 GX 5-1
270.2634 -25.8132 5.2 18.0 108.2 0.3945 2.2 4.7 GRS 1758-258
273.8953 -13.8552 0.0 18.6 67.9 0.2505 1.4 12.6 GX 17+2
275.7674 -30.3042 3.9 24.5 111.3 -0.6309 -2.9 9.0 H1820-303
284.8758 -25.0289 6.8 29.9 93.6 -0.4651 -1.7 10.9 HT1900.1-2455
288.9424 11.0300 0.0 42.9 33.9 1.2189 2.7 9.9 GRS 1915+105
263.1301 -33.9411 23.1 20.2 139.1 -0.0910 -0.5 9.5 GX 354-0
294.7818 -25.7261 2.7 38.8 92.0 3.0225 4.3 ------ UNKNOWN
292.6632 -11.0880 2.3 37.1 68.0 2.4822 5.0 ------ UNKNOWN
289.8841 5.8885 2.6 40.7 41.1 1.7858 4.4 ------ UNKNOWN
237.6658 -46.2376 0.1 34.1 -179.1 18.1304 95.1 ------ UNKNOWN
209.7835 -57.0824 2.4 53.7 -171.9 2.0961 4.8 ------ UNKNOWN
267.1347 40.5871 3.9 57.0 -9.1 2.2358 3.0 ------ UNKNOWN
249.9193 43.5161 3.4 58.9 -24.4 3.4301 3.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
79.356600 501.456600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2965 -60.6354 12.7 40.6 -127.4 0.8368 0.9 0.9 Cen X-3
186.7651 -62.7369 4.7 32.7 -130.3 1.4109 2.4 3.6 GX 301-2
244.9809 -15.6344 0.3 31.2 22.3 21.1650 40.0 0.4 Sco X-1
255.9401 -38.0119 29.0 15.8 73.9 -0.1680 -0.4 10.3 4U 1700-377
256.5531 -36.4219 4.5 17.2 70.6 1.0623 2.5 5.7 GX 349+2
263.1110 -24.7210 2.4 29.6 60.8 3.4139 4.8 5.8 GX 1+4
264.9247 -44.5409 6.0 19.1 103.5 0.9056 1.9 9.5 4U 1735-44
270.2357 -25.0572 5.1 33.5 70.7 1.9984 2.3 2.9 GX 5-1
270.2906 -25.8146 5.9 33.0 71.7 1.6586 2.0 4.3 GRS 1758-258
275.8493 -30.3976 16.2 33.4 83.9 0.6532 0.7 4.3 H1820-303
263.0990 -33.7645 5.6 23.0 74.8 1.1119 2.1 6.9 GX 354-0
259.8699 -75.7730 3.7 31.0 178.1 1.4821 3.1 ------ UNKNOWN
184.5608 -60.3252 3.7 33.6 -125.8 1.9239 3.1 ------ UNKNOWN
180.2895 -57.3008 3.5 36.0 -120.8 2.5517 3.3 ------ UNKNOWN
126.8570 -67.1539 4.7 55.3 -145.3 9.0359 2.5 ------ UNKNOWN
127.5583 -66.9381 5.6 55.2 -144.9 7.3849 2.2 ------ UNKNOWN
185.2502 -34.2109 3.2 41.0 -83.7 9.1202 3.7 ------ UNKNOWN
Plot creation:
Sat May 30 22:00:31 EDT 2015