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
260.2015 41.1194 0.0133 47.5809 -17.9568 2.0134797 14.481 TRIG_00535764
Foreground time interval of the image:
-7.452 23.541 (delta_t = 30.993 [sec])
Background time interval of the image:
-239.160 -7.452 (delta_t = 231.708 [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 2.048000
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 2.048000
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 2.048000
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 -7.452 sec. to 109.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20158 ( -0.143009 0.139759 )
Norm@50keV : 1.96644E-03 ( -0.000165023 0.000164539 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.60 using 59 PHA bins.
# Reduced chi-squared = 0.7650 for 57 degrees of freedom
# Null hypothesis probability = 9.040856e-01
Photon flux (15-150 keV) in 117 sec: 0.230870 ( -0.0206809 0.0208016 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33314e-06 ( -1.98894e-07 1.9932e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.452 sec. to 109.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.417727 ( -0.707269 0.606873 )
Epeak [keV] : 116.193 ( -30.1041 181.291 )
Norm@50keV : 4.36013E-03 ( -0.00197029 0.00427542 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.57 using 59 PHA bins.
# Reduced chi-squared = 0.6888 for 56 degrees of freedom
# Null hypothesis probability = 9.634722e-01
Photon flux (15-150 keV) in 117 sec: 0.222180 ( -0.021649 0.02178 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25768e-06 ( -2.12332e-07 2.10881e-07 ) ergs/cm2
Band function
Time interval is from -7.452 sec. to 109.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.416100 ( -1.27934 -0.399144 )
beta : -1.50768 ( 1.50643 0.30021 )
Epeak [keV] : 67.6009 ( -34.8532 135.959 )
Norm@50keV : 1.35033E-02 ( -0.0129335 9.42768 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.51 using 59 PHA bins.
# Reduced chi-squared = 0.7003 for 55 degrees of freedom
# Null hypothesis probability = 9.552902e-01
Photon flux (15-150 keV) in 117 sec: 0.221703 ( 6.7783 -0.021632 ) 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] : 20.0430 (-1.92553 2.2167)
R^2/D10^2 : 1.06914E-02 (-0.00320129 0.00439348)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9315 for 57 degrees of freedom
# Null hypothesis probability = 6.222354e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.679e-08 1.720e-08
25- 50 4.828e-07 6.189e-08
50-150 1.438e-06 1.866e-07
15-150 2.018e-06 2.112e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.994567 (-0.0834238 0.083399)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.63 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.803848e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.899e-07 3.130e-08
25- 50 5.576e-07 1.829e-07
50-150 1.223e-06 5.166e-07
15-150 2.070e-06 4.990e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.42145 (-3.32862 4.55764)
R1^2/D10^2 : 6.44145E-02 (-0.0400918 0.171671)
kT2 [keV] : 29.8425 (-6.92063 30.3144)
R2^2/D10^2 : 2.26027E-03 (-0.00203005 0.00346631)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.99 using 59 PHA bins.
# Reduced chi-squared = 0.6908 for 55 degrees of freedom
# Null hypothesis probability = 9.609628e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.701e-07 9.219e-08
25- 50 5.310e-07 2.504e-07
50-150 1.567e-06 7.321e-07
15-150 2.268e-06 9.957e-07
Peak spectrum fit
Power-law model
Time interval is from -0.648 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.884737 ( -0.499847 0.43719 )
Norm@50keV : 1.01068E-02 ( -0.00294267 0.00275875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.246654e-01
Photon flux (15-150 keV) in 1 sec: 1.15998 ( -0.319013 0.328285 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14105e-07 ( -2.73621e-08 2.73807e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.648 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.753679 ( -2.69099 -0.75367 )
Epeak [keV] : 648.138 ( -648.096 -648.096 )
Norm@50keV : 1.12917E-02 ( -0.0036984 0.062585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 56 degrees of freedom
# Null hypothesis probability = 3.887421e-01
Photon flux (15-150 keV) in 1 sec: 1.15164 ( -0.33505 0.33316 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1407e-07 ( -2.75498e-08 2.74e-08 ) ergs/cm2
Band function
Time interval is from -0.648 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.776459 ( 0.776459 0.776459 )
beta : -0.884742 ( -0.437082 0.49985 )
Epeak [keV] : 22.0274 ( -22.0274 -22.0274 )
Norm@50keV : 1.60037E-02 ( -0.00837451 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.524977e-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] : 28.6241 (-7.93244 14.9228)
R^2/D10^2 : 1.91461E-02 (-0.0134851 0.0341438)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.36 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.554601e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.525e-09 1.576e-09
25- 50 1.527e-08 9.095e-09
50-150 8.987e-08 5.305e-08
15-150 1.077e-07 6.155e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.17445 (-1.33518 1.33468)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.46 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.067392e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.290e-08 7.985e-09
25- 50 2.482e-08 1.470e-08
50-150 5.442e-08 3.199e-08
15-150 9.214e-08 5.455e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.83052 (-6.83105 -6.83105)
R1^2/D10^2 : 0.802225 (-0.801997 -0.801997)
kT2 [keV] : 35.5093 (-12.9984 -35.51)
R2^2/D10^2 : 9.35365E-03 (-0.00935295 0.0306606)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.22 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.577458e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.512e-09 5.055e-09
25- 50 1.851e-08 1.011e-08
50-150 9.005e-08 5.305e-08
15-150 1.161e-07 6.195e-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: 1.15833 ( -0.161041 0.155799 )
Norm@50keV : 4.82167E-03 ( -0.000462199 0.00045907 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9461 for 57 degrees of freedom
# Null hypothesis probability = 5.910634e-01
Photon flux (15-150 keV) in 30.99 sec: 0.562871 ( -0.0575472 0.058027 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5344e-06 ( -1.43495e-07 1.43676e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.409657 ( -0.799581 0.675023 )
Epeak [keV] : 125.178 ( -36.7428 475.01 )
Norm@50keV : 1.01499E-02 ( -0.0048931 0.0114811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.31 using 59 PHA bins.
# Reduced chi-squared = 0.8984 for 56 degrees of freedom
# Null hypothesis probability = 6.890753e-01
Photon flux (15-150 keV) in 30.99 sec: 0.543306 ( -0.059608 0.060317 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49528e-06 ( -1.51984e-07 1.50429e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.884758 ( -1.66242 -0.775545 )
beta : -1.46616 ( -3.33457 0.300211 )
Epeak [keV] : 62.8431 ( -26.5788 114.711 )
Norm@50keV : 5.57994E-02 ( -0.0579152 12.8631 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.52 using 59 PHA bins.
# Reduced chi-squared = 0.8822 for 55 degrees of freedom
# Null hypothesis probability = 7.189196e-01
Photon flux (15-150 keV) in 30.99 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) = 4.91e-07
S(50-100 keV) = 8.53e-07
T90 vs. Hardness ratio plot
T90 = 97.2359999418259 sec.
Hardness ratio (energy fluence ratio) = 1.73727
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.36313
Count Ratio (50-100 keV) / (15-25 keV) = 2.29904
Mask shadow pattern
IMX = 1.041096568593759E+00, IMY = 3.374044933331037E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.160000 -7.452000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4426 35.3475 4.2 46.6 -27.9 1.1175 2.8 0.8 Her X-1
256.1895 -38.0094 0.0 48.4 -136.2 -0.7827 -1.2 13.8 4U 1700-377
256.2966 -36.5243 4.0 47.3 -134.8 -1.7531 -2.9 9.0 GX 349+2
262.8964 -24.8780 85.9 35.1 -128.1 0.0407 0.1 10.0 GX 1+4
264.7490 -44.4102 14.5 49.5 -148.1 0.4162 0.8 2.4 4U 1735-44
268.5162 -1.5693 6.5 19.4 -86.2 0.3882 1.8 11.3 SW J1753.5-0127
270.2720 -25.0534 2.4 30.8 -137.5 1.1502 4.7 1.7 GX 5-1
270.4395 -25.6521 8.1 31.2 -138.4 0.3486 1.4 9.2 GRS 1758-258
273.9675 -13.8955 3.5 20.0 -126.9 0.6768 3.3 8.7 GX 17+2
275.9067 -30.3933 3.6 33.0 -150.7 0.7305 3.2 1.8 H1820-303
285.2174 -25.0474 0.0 25.8 -164.3 0.2674 1.3 12.5 HT1900.1-2455
288.8167 10.9058 1.7 10.3 15.8 1.2998 6.6 2.6 GRS 1915+105
299.5680 35.2171 2.2 36.3 26.6 1.4991 5.2 1.4 Cyg X-1
308.1490 40.9120 3.2 44.3 32.4 1.9004 3.5 3.0 Cyg X-3
262.7940 -33.6846 0.0 41.6 -137.7 -0.0645 -0.2 13.3 GX 354-0
290.9035 -16.2414 2.7 17.1 -179.8 0.7343 4.3 ------ UNKNOWN
288.9033 -20.6230 2.4 21.3 -172.5 0.9612 4.8 ------ UNKNOWN
255.2755 47.7297 2.8 54.9 -16.0 2.5000 4.2 ------ UNKNOWN
266.2968 -26.4149 0.9 34.1 -133.8 3.4994 13.3 ------ UNKNOWN
250.1514 12.5874 2.5 39.2 -60.4 1.9235 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-7.452000 23.540610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3528 35.4563 5.2 46.7 -27.8 0.3122 2.2 8.5 Her X-1
256.1763 -37.9546 6.5 48.3 -136.1 0.3944 1.8 11.2 4U 1700-377
256.3047 -36.4635 6.6 47.2 -134.8 0.3640 1.8 6.8 GX 349+2
262.8541 -24.7566 6.9 35.0 -127.9 -0.1734 -1.7 8.5 GX 1+4
264.9241 -44.5026 12.4 49.5 -148.3 -0.1580 -0.9 8.4 4U 1735-44
268.2091 -1.4144 8.2 19.7 -85.6 0.1115 1.4 9.8 SW J1753.5-0127
270.4098 -24.9338 0.0 30.6 -137.5 0.1046 1.2 11.1 GX 5-1
270.1650 -25.8319 4.9 31.5 -138.2 0.1988 2.4 9.1 GRS 1758-258
273.8821 -14.1962 0.0 20.2 -127.3 0.0830 1.1 12.0 GX 17+2
275.8475 -30.5153 8.7 33.1 -150.7 -0.1016 -1.3 9.8 H1820-303
284.8664 -24.8333 20.5 25.6 -163.5 0.0404 0.6 10.6 HT1900.1-2455
288.9352 11.0319 23.9 10.5 16.3 0.0309 0.5 9.6 GRS 1915+105
299.4072 35.2969 412.2 36.3 26.3 -0.0028 -0.0 10.6 Cyg X-1
307.9355 40.9934 17.5 44.3 32.1 0.1060 0.7 8.3 Cyg X-3
262.9778 -33.9689 5.9 41.7 -138.1 -0.2365 -1.9 8.1 GX 354-0
310.0829 -36.3691 2.3 42.4 163.4 0.6193 5.0 ------ UNKNOWN
286.2780 48.7236 2.4 48.1 8.9 0.7402 4.9 ------ UNKNOWN
296.1443 -45.1433 2.7 46.4 -177.8 0.5403 4.3 ------ UNKNOWN
291.8977 -46.5623 2.6 47.3 -173.5 0.5460 4.5 ------ UNKNOWN
260.2015 41.1194 0.8 47.6 -18.0 2.0135 14.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
86.740610 272.740600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5215 35.2382 3.5 7.4 -117.2 0.4979 3.2 7.0 Her X-1
268.2318 -1.4256 3.4 43.2 -167.8 0.9374 3.4 8.3 SW J1753.5-0127
274.0537 -14.0283 10.5 56.6 -172.2 0.7834 1.1 2.8 GX 17+2
288.9193 10.9937 4.6 39.3 155.9 0.8128 2.5 7.7 GRS 1915+105
299.4947 35.1750 2.5 31.2 112.0 1.3477 4.6 5.0 Cyg X-1
308.1674 40.9325 3.4 35.7 98.0 1.2638 3.4 2.9 Cyg X-3
235.6772 37.4493 2.8 19.3 -69.0 0.6851 4.0 ------ UNKNOWN
252.3201 3.0406 2.5 38.8 -143.4 1.0760 4.7 ------ UNKNOWN
204.9816 41.7924 2.4 40.6 -46.1 1.3407 4.7 ------ UNKNOWN
171.4117 50.1970 3.3 59.0 -24.3 4.4411 3.6 ------ UNKNOWN
172.6393 49.1692 2.8 58.7 -25.8 5.1053 4.1 ------ UNKNOWN
250.9705 -13.4343 4.5 55.2 -145.1 2.7648 2.6 ------ UNKNOWN
Plot creation:
Sat May 30 18:10:45 EDT 2015