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
225.9431 -31.6530 0.0178 25.6639 25.8237 0.0488699 10.773 TRIG_00426114
Foreground time interval of the image:
-0.004 0.036 (delta_t = 0.040 [sec])
Background time interval of the image:
-239.764 -0.004 (delta_t = 239.760 [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 0.032000
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 0.032000
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 0.032000
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 -0.004 sec. to 0.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25177 ( -0.241358 0.254431 )
Norm@50keV : 5.28441E-02 ( -0.0104773 0.0104489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.98 using 59 PHA bins.
# Reduced chi-squared = 1.421 for 57 degrees of freedom
# Null hypothesis probability = 2.011205e-02
Photon flux (15-150 keV) in 0.04 sec: 6.25214 ( -1.2246 1.22469 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11379e-08 ( -4.56564e-09 4.6028e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.65416 ( -3.67971 1.84242 )
Epeak [keV] : 74.3325 ( -8.85651 12.1819 )
Norm@50keV : 2.24419 ( -2.3151 31.4327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 56 degrees of freedom
# Null hypothesis probability = 3.188931e-01
Photon flux (15-150 keV) in 0.04 sec: 6.59169 ( -1.20044 1.24555 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4707e-08 ( -4.87444e-09 4.94012e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.036 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.79602 ( -2.01656 -2.82637 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 74.0477 ( -8.65473 12.3768 )
Norm@50keV : 2.51874 ( -2.51842 10.6827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.44 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.858764e-01
Photon flux (15-150 keV) in 0.04 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] : 19.8276 (-2.65542 2.94218)
R^2/D10^2 : 0.397681 (-0.1501 0.229977)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.89 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.376824e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.210e-09 3.730e-10
25- 50 5.991e-09 1.521e-09
50-150 1.744e-08 4.812e-09
15-150 2.464e-08 5.482e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 25.3890 (-5.02132 5.01798)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.60 using 59 PHA bins.
# Reduced chi-squared = 1.432 for 57 degrees of freedom
# Null hypothesis probability = 1.797688e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.542e-09 1.489e-09
25- 50 4.889e-09 2.902e-09
50-150 1.072e-08 6.208e-09
15-150 1.815e-08 1.061e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.64258 (-3.62785 -3.62785)
R1^2/D10^2 : 7.27759 (-7.88658 -7.88658)
kT2 [keV] : 20.0447 (-2.80708 3.51256)
R2^2/D10^2 : 0.379400 (-0.380211 0.242043)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.79 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 55 degrees of freedom
# Null hypothesis probability = 2.751869e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.340e-09 5.987e-10
25- 50 5.904e-09 2.413e-09
50-150 1.746e-08 6.864e-09
15-150 2.470e-08 9.624e-09
Peak spectrum fit
Power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.532705 ( -0.537868 0.463379 )
Norm@50keV : 4.04842E-03 ( -0.00140515 0.00136367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.63 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 57 degrees of freedom
# Null hypothesis probability = 6.829240e-02
Photon flux (15-150 keV) in 1 sec: 0.476568 ( -0.143957 0.148335 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35274e-08 ( -1.54212e-08 1.55125e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.98507 ( )
Epeak [keV] : 84.1658 ( -9.54966 10.0525 )
Norm@50keV : 5.01417 ( -5.08394 1.35265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.83 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.472829e-01
Photon flux (15-150 keV) in 1 sec: 0.382612 ( -0.094897 0.094916 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.66555e-08 ( -1.23329e-08 1.29928e-08 ) ergs/cm2
Band function
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.55034 -5 )
beta : -9.37167 ( 9.37167 19.3707 )
Epeak [keV] : 90.4949 ( -14.2019 15.6713 )
Norm@50keV : 0.241892 ( -0.0611408 0.42938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.19 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.634624e-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] : 28.5002 (-6.94133 12.6457)
R^2/D10^2 : 9.54691E-03 (-0.00953807 0.0126607)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.56 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 57 degrees of freedom
# Null hypothesis probability = 1.403024e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-09 7.895e-10
25- 50 7.553e-09 4.426e-09
50-150 4.413e-08 2.700e-08
15-150 5.294e-08 3.213e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.81832 (-0.647938 0.647852)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.62 using 59 PHA bins.
# Reduced chi-squared = 1.502 for 57 degrees of freedom
# Null hypothesis probability = 8.427441e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.527e-09 2.888e-09
25- 50 8.707e-09 5.745e-09
50-150 1.910e-08 1.216e-08
15-150 3.233e-08 2.043e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.226531 (-0.226531 -0.226531)
R1^2/D10^2 : 8.71669E-02 (-0.0871669 -0.0871669)
kT2 [keV] : 28.5065 (-6.93833 12.6486)
R2^2/D10^2 : 9.54094E-03 (-0.00621175 0.0126579)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.56 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 55 degrees of freedom
# Null hypothesis probability = 1.033879e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 1.25177 ( -0.241358 0.254431 )
Norm@50keV : 5.28441E-02 ( -0.0104773 0.0104489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.98 using 59 PHA bins.
# Reduced chi-squared = 1.421 for 57 degrees of freedom
# Null hypothesis probability = 2.011205e-02
Photon flux (15-150 keV) in 0.04 sec: 6.25214 ( -1.2246 1.22469 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11379e-08 ( -4.56564e-09 4.6028e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.65416 ( -3.67971 1.84242 )
Epeak [keV] : 74.3325 ( -8.85651 12.1819 )
Norm@50keV : 2.24419 ( -2.3151 31.4327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 56 degrees of freedom
# Null hypothesis probability = 3.188931e-01
Photon flux (15-150 keV) in 0.04 sec: 6.59169 ( -1.20034 1.24555 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4707e-08 ( -4.87444e-09 4.94012e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.79602 ( -2.01656 -2.82637 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 74.0477 ( -8.65473 12.3768 )
Norm@50keV : 2.51874 ( -2.51842 10.6827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.44 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.858764e-01
Photon flux (15-150 keV) in 0.04 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) = 4.58e-09
S(50-100 keV) = 7.69e-09
T90 vs. Hardness ratio plot
T90 = 0.0359999537467957 sec.
Hardness ratio (energy fluence ratio) = 1.67904
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.94294
Count Ratio (50-100 keV) / (15-25 keV) = 3.56803
Mask shadow pattern
IMX = 4.325087441392111E-01, IMY = -2.093035884143307E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
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:
-239.764000 -0.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2248 -60.6147 10.5 30.1 -88.0 0.3400 1.1 2.7 Cen X-3
186.6512 -62.7925 0.9 22.0 -88.8 3.1550 13.0 1.3 GX 301-2
244.9988 -15.6487 1.0 43.0 55.3 10.0926 11.6 1.2 Sco X-1
255.9904 -37.8481 1587.5 25.7 86.6 -0.0019 -0.0 0.3 4U 1700-377
256.5661 -36.3554 4.2 27.2 85.7 0.8854 2.8 7.5 GX 349+2
264.4815 -44.5133 0.0 24.7 108.2 -0.3310 -1.2 11.8 4U 1735-44
263.0407 -33.8830 4.1 32.2 92.0 1.3195 2.8 3.9 GX 354-0
255.1679 -41.6858 2.4 22.2 90.8 1.1690 4.8 ------ UNKNOWN
321.6682 -52.4732 2.6 48.9 160.2 2.7087 4.4 ------ UNKNOWN
214.6594 -5.1008 2.3 53.5 14.8 5.0463 5.0 ------ UNKNOWN
21.1255 -61.1071 5.0 59.6 -161.7 4.7257 2.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.004000 0.036000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2525 -60.4763 5.7 30.1 -87.7 -0.0101 -2.0 9.0 Cen X-3
186.6398 -62.8018 179.1 22.0 -88.8 -0.0003 -0.1 1.9 GX 301-2
245.0915 -15.6007 4.9 43.1 55.4 0.0375 2.4 6.9 Sco X-1
256.1745 -37.8711 8.8 25.8 86.9 -0.0072 -1.3 9.0 4U 1700-377
256.6075 -36.4558 156.8 27.2 85.9 -0.0004 -0.1 8.5 GX 349+2
264.6708 -44.2479 0.0 25.0 108.0 -0.0103 -2.0 12.5 4U 1735-44
263.1409 -33.8716 7.6 32.2 92.1 0.0115 1.5 7.9 GX 354-0
230.2607 -22.3712 2.4 34.8 34.3 0.0281 4.8 ------ UNKNOWN
262.7686 -50.9865 2.9 19.9 120.1 0.0166 3.9 ------ UNKNOWN
225.9430 -31.6530 1.1 25.7 25.8 0.0489 10.8 ------ UNKNOWN
337.2373 -75.5502 2.1 39.3 -168.0 0.0261 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
69.136590 962.307100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2972 -60.7012 22.9 46.2 -148.4 0.7440 0.5 4.7 Cen X-3
186.7029 -62.7887 1.1 39.8 -155.6 13.5826 10.5 1.7 GX 301-2
244.9808 -15.6347 0.3 23.6 49.1 39.9046 46.2 0.3 Sco X-1
256.1865 -37.9397 8.5 25.5 110.2 -1.3015 -1.4 11.1 4U 1700-377
256.5079 -36.2634 3.9 25.6 106.3 2.9647 2.9 10.2 GX 349+2
262.9174 -24.6372 12.6 33.1 84.7 1.3803 0.9 8.2 GX 1+4
264.5122 -44.3834 4.6 32.5 121.7 -3.1165 -2.5 10.7 4U 1735-44
270.3336 -24.9407 7.7 39.3 89.2 -4.4485 -1.5 8.7 GX 5-1
270.3480 -25.7440 5.2 39.1 90.4 6.5817 2.2 2.5 GRS 1758-258
262.9862 -33.8541 13.3 31.0 101.7 1.2639 0.9 1.2 GX 354-0
255.1986 -41.6444 2.2 25.3 119.0 4.6131 5.3 ------ UNKNOWN
234.6120 -33.4814 2.8 7.5 104.0 2.4054 4.1 ------ UNKNOWN
230.0841 -57.1585 3.0 25.7 172.4 2.5864 3.9 ------ UNKNOWN
228.0680 -41.5123 3.3 10.0 168.5 2.3773 3.5 ------ UNKNOWN
227.5817 17.5351 3.2 49.2 -0.5 5.9886 3.6 ------ UNKNOWN
217.7185 -66.2953 4.4 35.0 -176.7 2.2359 2.6 ------ UNKNOWN
199.7616 -58.4302 4.5 32.1 -156.7 1.9149 2.6 ------ UNKNOWN
201.3043 -43.0201 2.6 22.6 -129.8 3.4885 4.5 ------ UNKNOWN
137.4750 -76.0493 4.3 59.0 -166.2 14.4077 2.7 ------ UNKNOWN
166.6938 -49.4100 3.7 47.1 -132.7 8.2677 3.1 ------ UNKNOWN
191.5019 2.1278 4.3 47.0 -53.2 10.3804 2.7 ------ UNKNOWN
Plot creation:
Sun May 31 01:08:53 EDT 2015