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
203.9663 -18.3208 0.0061 25.2125 -122.2900 2.8083513 31.318 TRIG_00650530
Foreground time interval of the image:
-8.696 19.157 (delta_t = 27.853 [sec])
Background time interval of the image:
-105.843 -8.696 (delta_t = 97.147 [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 1.024000
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 1.024000
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 1.024000
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 -8.696 sec. to 95.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13200 ( -0.0751098 0.0746462 )
Norm@50keV : 3.33701E-03 ( -0.000133808 0.000133767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.04 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 57 degrees of freedom
# Null hypothesis probability = 9.993074e-02
Photon flux (15-150 keV) in 104.6 sec: 0.388362 ( -0.0161778 0.016204 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61298e-06 ( -1.59795e-07 1.60426e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.696 sec. to 95.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.777190 ( -0.317993 0.295611 )
Epeak [keV] : 194.567 ( -65.6535 572.434 )
Norm@50keV : 4.80440E-03 ( -0.00122957 0.00177959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 56 degrees of freedom
# Null hypothesis probability = 1.532620e-01
Photon flux (15-150 keV) in 104.6 sec: 0.380010 ( -0.017533 0.017537 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.52965e-06 ( -1.76638e-07 1.75885e-07 ) ergs/cm2
Band function
Time interval is from -8.696 sec. to 95.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.777417 ( -0.267878 0.13668 )
beta : -10.00000 ( 10 2.65157e-11 )
Epeak [keV] : 194.630 ( -75.9598 572.008 )
Norm@50keV : 4.80303E-03 ( -0.00122795 0.00178132 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 55 degrees of freedom
# Null hypothesis probability = 1.324273e-01
Photon flux (15-150 keV) in 104.6 sec: 0.382044 ( ) 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] : 20.5072 ( )
R^2/D10^2 : 1.64947E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 148.48 using 59 PHA bins.
# Reduced chi-squared = 2.6049 for 57 degrees of freedom
# Null hypothesis probability = 4.341326e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.385e-07 1.093e-08
25- 50 7.011e-07 4.765e-08
50-150 2.193e-06 1.506e-07
15-150 3.032e-06 1.454e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.61775 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 156.35 using 59 PHA bins.
# Reduced chi-squared = 2.7429 for 57 degrees of freedom
# Null hypothesis probability = 3.422039e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.214e-07 1.935e-08
25- 50 8.106e-07 3.823e-08
50-150 1.778e-06 7.950e-08
15-150 3.010e-06 1.271e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.69777 (-1.10849 1.33218)
R1^2/D10^2 : 0.315913 (-0.145008 0.29719)
kT2 [keV] : 27.8601 (-2.71936 3.71751)
R2^2/D10^2 : 5.49300E-03 (-0.00188253 0.00228249)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.16 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.362306e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.999e-07 6.093e-08
25- 50 7.207e-07 9.754e-08
50-150 2.491e-06 2.469e-07
15-150 3.511e-06 3.373e-07
Peak spectrum fit
Power-law model
Time interval is from 9.212 sec. to 10.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.982843 ( -0.326153 0.308872 )
Norm@50keV : 9.00130E-03 ( -0.00153147 0.00151558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.72 using 59 PHA bins.
# Reduced chi-squared = 0.9599 for 57 degrees of freedom
# Null hypothesis probability = 5.612463e-01
Photon flux (15-150 keV) in 1 sec: 1.03546 ( -0.178222 0.179367 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.79192e-08 ( -1.76636e-08 1.78635e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.212 sec. to 10.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.989197 ( -1.11637 0.303202 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 9.05861E-03 ( -0.00153287 0.0162988 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.72 using 59 PHA bins.
# Reduced chi-squared = 0.9772 for 56 degrees of freedom
# Null hypothesis probability = 5.232560e-01
Photon flux (15-150 keV) in 1 sec: 1.03480 ( -0.180858 0.17803 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.77927e-08 ( -8.897e-09 1.78813e-08 ) ergs/cm2
Band function
Time interval is from 9.212 sec. to 10.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.836653 ( 0.836599 0.836599 )
beta : -0.982841 ( 0.98284 0.326152 )
Epeak [keV] : 44.2711 ( -44.3466 -44.3466 )
Norm@50keV : 1.43617E-02 ( -0.00684372 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.72 using 59 PHA bins.
# Reduced chi-squared = 0.9948 for 55 degrees of freedom
# Null hypothesis probability = 4.854291e-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] : 25.0938 (-5.46213 7.98556)
R^2/D10^2 : 2.43588E-02 (-0.0135728 0.0276289)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.16 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 57 degrees of freedom
# Null hypothesis probability = 2.974091e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.659e-09 1.170e-09
25- 50 1.512e-08 4.903e-09
50-150 7.054e-08 2.535e-08
15-150 8.832e-08 2.887e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-47.1041 -200)
Norm : 4.24454 (-0.737123 0.737123)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.38 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.341312e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.057e-08 6.095e-09
25- 50 2.033e-08 1.151e-08
50-150 4.459e-08 2.569e-08
15-150 7.549e-08 4.392e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.20190 (-2.73659 4.40786)
R1^2/D10^2 : 1.24829 (-1.0673 12.9497)
kT2 [keV] : 34.6257 (-10.0279 29.047)
R2^2/D10^2 : 8.51946E-03 (-0.00679371 0.00849505)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.13 using 59 PHA bins.
# Reduced chi-squared = 0.9661 for 55 degrees of freedom
# Null hypothesis probability = 5.462248e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.137e-09 4.911e-09
25- 50 1.664e-08 9.285e-09
50-150 7.569e-08 4.137e-08
15-150 1.005e-07 5.115e-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: 0.813342 ( -0.0873756 0.0857913 )
Norm@50keV : 6.53592E-03 ( -0.00031275 0.000310674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.22 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.286442e-01
Photon flux (15-150 keV) in 27.85 sec: 0.750859 ( -0.0350868 0.035203 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11529e-06 ( -1.01024e-07 1.01366e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.703925 ( -0.356664 0.141378 )
Epeak [keV] : 720.307 ( -754.454 -754.454 )
Norm@50keV : 7.23223E-03 ( -0.00136246 0.00270025 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.94 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 56 degrees of freedom
# Null hypothesis probability = 1.148023e-01
Photon flux (15-150 keV) in 27.85 sec: 0.746627 ( -0.03735 0.037326 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1073e-06 ( -1.05805e-07 1.03237e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.810002 ( 0.809929 0.809929 )
beta : -0.813341 ( -0.0857414 0.0874478 )
Epeak [keV] : 16.8220 ( -16.8229 -16.8229 )
Norm@50keV : 9.25156E-03 ( -0.00301684 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.22 using 59 PHA bins.
# Reduced chi-squared = 1.258 for 55 degrees of freedom
# Null hypothesis probability = 9.407981e-02
Photon flux (15-150 keV) in 27.85 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) = 7.28e-07
S(50-100 keV) = 1.33e-06
T90 vs. Hardness ratio plot
T90 = 87.9559999704361 sec.
Hardness ratio (energy fluence ratio) = 1.82692
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.75985
Count Ratio (50-100 keV) / (15-25 keV) = 1.79283
Mask shadow pattern
IMX = -2.515194605134363E-01, IMY = 3.980184254623811E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-105.843410 -8.696000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9935 -15.6395 0.5 17.7 105.1 3.6764 22.7 0.8 Sco X-1
254.5758 35.2704 6.0 50.9 19.7 0.8704 1.9 7.2 Her X-1
255.8979 -37.8333 3.0 38.1 135.2 1.1831 3.8 4.3 4U 1700-377
256.3739 -36.2976 6.2 37.4 132.9 -0.5780 -1.8 8.1 GX 349+2
262.9588 -24.6948 4.1 36.6 111.4 1.0351 2.8 4.1 GX 1+4
264.9226 -44.3937 20.7 47.5 136.3 0.3788 0.6 8.4 4U 1735-44
263.1241 -33.8455 9.3 40.5 124.7 -0.5899 -1.2 6.8 GX 354-0
263.1886 -19.4029 2.7 35.4 102.6 1.4861 4.3 ------ UNKNOWN
209.8136 31.5844 2.6 44.3 -30.8 1.0935 4.4 ------ UNKNOWN
191.8662 15.6170 3.2 43.6 -64.0 2.7289 3.6 ------ UNKNOWN
182.9748 -22.8376 2.9 45.4 -121.5 2.5888 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-8.696000 19.156590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8383 -15.4871 0.0 17.5 104.8 0.1773 2.0 12.3 Sco X-1
254.3318 35.3003 4.2 50.8 19.4 0.7263 2.7 6.7 Her X-1
256.1500 -37.8624 5.3 38.2 135.0 0.4000 2.2 7.8 4U 1700-377
256.4287 -36.3018 3.4 37.4 132.8 0.5761 3.4 7.3 GX 349+2
262.9433 -24.7344 4.3 36.6 111.4 -0.5181 -2.7 3.6 GX 1+4
264.7190 -44.3665 9.6 47.4 136.4 0.4313 1.2 5.1 4U 1735-44
262.9906 -33.8320 1529.3 40.4 124.7 -0.0019 -0.0 0.2 GX 354-0
223.1598 -56.2602 2.3 47.3 175.5 0.8293 5.0 ------ UNKNOWN
203.9663 -18.3208 0.4 25.2 -122.3 2.8083 31.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
66.156600 607.256610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2872 -60.6043 3.2 48.6 179.3 3.7287 3.6 1.4 Cen X-3
186.8539 -62.7859 4.7 46.0 168.8 2.4104 2.4 5.5 GX 301-2
244.9982 -15.6645 1.3 39.2 70.4 16.1462 8.7 1.8 Sco X-1
233.9119 -63.1194 2.5 49.2 140.6 9.6611 4.6 ------ UNKNOWN
233.8643 -46.6319 2.5 37.4 123.7 5.3119 4.6 ------ UNKNOWN
211.2172 -27.0200 2.7 10.9 121.9 1.5829 4.3 ------ UNKNOWN
144.4702 -54.2375 4.1 57.6 -165.4 5.9252 2.8 ------ UNKNOWN
180.1259 -12.0423 2.9 23.9 -100.2 1.6581 4.0 ------ UNKNOWN
205.7712 37.1494 2.7 55.5 -20.4 5.5917 4.2 ------ UNKNOWN
155.9676 -19.3546 2.6 45.3 -121.4 9.0123 4.5 ------ UNKNOWN
152.5202 -24.6359 4.5 48.1 -129.1 5.4566 2.5 ------ UNKNOWN
Plot creation:
Sun Aug 30 19:07:03 EDT 2015