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
269.5569 -63.8059 0.0134 18.6060 -68.8529 0.4012042 14.385 TRIG_00273180
Foreground time interval of the image:
-1.404 5.716 (delta_t = 7.120 [sec])
Background time interval of the image:
-239.056 -1.404 (delta_t = 237.652 [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 -1.404 sec. to 5.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88303 ( -0.1851 0.191733 )
Norm@50keV : 3.21230E-03 ( -0.000424739 0.00041944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.85 using 59 PHA bins.
# Reduced chi-squared = 1.348 for 57 degrees of freedom
# Null hypothesis probability = 4.097095e-02
Photon flux (15-150 keV) in 7.12 sec: 0.457720 ( -0.0515209 0.0515384 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10245e-07 ( -2.7292e-08 2.78549e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.404 sec. to 5.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.686542 ( -2.04746 1.35081 )
Epeak [keV] : 39.5390 ( -4.80411 7.6186 )
Norm@50keV : 0.117374 ( -0.119752 2.29345 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 56 degrees of freedom
# Null hypothesis probability = 2.624305e-01
Photon flux (15-150 keV) in 7.12 sec: 0.426695 ( -0.052299 0.05272 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67146e-07 ( -2.60229e-08 3.02223e-08 ) ergs/cm2
Band function
Time interval is from -1.404 sec. to 5.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90854 ( -3.4922 -4.90854 )
beta : -2.78844 ( -0.734408 0.434549 )
Epeak [keV] : 31.7158 ( -3.63517 2.99485 )
Norm@50keV : 106.671 ( -11.4026 156.315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.661861e-01
Photon flux (15-150 keV) in 7.12 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85109e-07 ( -1.85059e-07 -2.76655e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.78437 (-1.01519 1.17158)
R^2/D10^2 : 0.248606 (-0.088637 0.131709)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.45 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.595334e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.424e-08 6.807e-09
25- 50 8.253e-08 1.194e-08
50-150 4.042e-08 1.144e-08
15-150 1.572e-07 2.225e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.7897 (-19.7833 33.5239)
Norm : 2.28858 (-0.366603 0.429929)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.26 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 57 degrees of freedom
# Null hypothesis probability = 1.279084e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.185e-08 6.675e-09
25- 50 6.679e-08 8.658e-09
50-150 8.651e-08 2.895e-08
15-150 1.952e-07 3.222e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.35102 (-1.93106 1.6517)
R1^2/D10^2 : 0.386728 (-0.147102 0.339887)
kT2 [keV] : 26.1866 (-17.4937 -30.3992)
R2^2/D10^2 : 2.07211E-03 (-0.00126855 0.0501671)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.62 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.442392e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.750e-08 1.523e-08
25- 50 7.733e-08 3.377e-08
50-150 7.053e-08 3.747e-08
15-150 1.854e-07 8.201e-08
Peak spectrum fit
Power-law model
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82041 ( -0.262731 0.275823 )
Norm@50keV : 6.32465E-03 ( -0.00115297 0.00112919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.23 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.666259e-01
Photon flux (15-150 keV) in 1 sec: 0.878512 ( -0.140245 0.140362 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81902e-08 ( -1.05489e-08 1.07903e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.167293 ( -2.17434 1.4584 )
Epeak [keV] : 45.7850 ( -9.53226 39.132 )
Norm@50keV : 5.71701E-02 ( -0.0586737 1.07155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.31 using 59 PHA bins.
# Reduced chi-squared = 0.9520 for 56 degrees of freedom
# Null hypothesis probability = 5.772830e-01
Photon flux (15-150 keV) in 1 sec: 0.834630 ( -0.143304 0.145535 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.00973e-08 ( -1.07219e-08 1.25478e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.50209 ( -5.81856 -4.50209 )
beta : -2.37285 ( -0.662946 0.460185 )
Epeak [keV] : 31.3254 ( -5.28819 5.56346 )
Norm@50keV : 110.897 ( -17.1776 1375.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.14 using 59 PHA bins.
# Reduced chi-squared = 0.9481 for 55 degrees of freedom
# Null hypothesis probability = 5.844696e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37828e-08 ( -5.37758e-08 -1.10137e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7966 (-1.63414 1.96611)
R^2/D10^2 : 0.327980 (-0.155155 0.281915)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.29 using 59 PHA bins.
# Reduced chi-squared = 0.9699 for 57 degrees of freedom
# Null hypothesis probability = 5.396702e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.957e-09 2.216e-09
25- 50 2.196e-08 4.850e-09
50-150 1.425e-08 5.362e-09
15-150 4.417e-08 1.083e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.1714 (-33.003 80.9643)
Norm : 4.11366 (-0.85832 1.11805)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9616 for 57 degrees of freedom
# Null hypothesis probability = 5.576797e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.071e-08 2.461e-09
25- 50 1.789e-08 3.565e-09
50-150 2.632e-08 1.536e-08
15-150 5.492e-08 1.843e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.44005 (-5.20843 2.16594)
R1^2/D10^2 : 0.492024 (-0.240934 5.71117)
kT2 [keV] : 56.6585 (-64.0272 -64.0273)
R2^2/D10^2 : 4.91066E-04 (-0.000336617 0.279274)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.97 using 59 PHA bins.
# Reduced chi-squared = 0.9449 for 55 degrees of freedom
# Null hypothesis probability = 5.910593e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.889e-09 4.375e-09
25- 50 2.112e-08 1.024e-08
50-150 2.465e-08 1.128e-08
15-150 5.466e-08 2.252e-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: 1.88303 ( -0.1851 0.191733 )
Norm@50keV : 3.21230E-03 ( -0.000424739 0.00041944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.85 using 59 PHA bins.
# Reduced chi-squared = 1.348 for 57 degrees of freedom
# Null hypothesis probability = 4.097095e-02
Photon flux (15-150 keV) in 7.12 sec: 0.457720 ( -0.0515209 0.0515384 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10245e-07 ( -2.7292e-08 2.78549e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.686542 ( -2.04746 1.35081 )
Epeak [keV] : 39.5390 ( -4.80411 7.6186 )
Norm@50keV : 0.117374 ( -0.119752 2.29345 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 56 degrees of freedom
# Null hypothesis probability = 2.624305e-01
Photon flux (15-150 keV) in 7.12 sec: 0.426695 ( -0.052299 0.05272 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67146e-07 ( -2.60229e-08 3.02223e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90854 ( -3.4922 -4.90854 )
beta : -2.78844 ( -0.734408 0.434549 )
Epeak [keV] : 31.7158 ( -3.63517 2.99485 )
Norm@50keV : 106.671 ( -11.4026 156.315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.661861e-01
Photon flux (15-150 keV) in 7.12 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85109e-07 ( -1.85059e-07 -2.76655e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.10e-08
S(50-100 keV) = 6.61e-08
T90 vs. Hardness ratio plot
T90 = 6.63999998569489 sec.
Hardness ratio (energy fluence ratio) = 1.08361
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.54964
Count Ratio (50-100 keV) / (15-25 keV) = 0.590795
Mask shadow pattern
IMX = 1.214525430920516E-01, IMY = 3.139821132370270E-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:
-239.056000 -1.404000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3293 -60.6700 2.4 40.2 14.4 1.4315 4.8 2.9 Cen X-3
186.6740 -62.7666 0.8 32.2 14.0 3.2860 15.0 0.5 GX 301-2
244.9744 -15.6360 0.5 35.3 149.3 7.6205 23.1 0.4 Sco X-1
255.7643 -37.9299 4.8 15.4 -175.2 0.4596 2.4 11.7 4U 1700-377
256.3753 -36.3870 1.7 17.0 -176.3 1.2321 6.9 3.6 GX 349+2
263.1073 -24.7554 3.2 30.0 -175.9 0.6565 3.6 5.4 GX 1+4
264.8093 -44.5929 6.2 15.3 -138.7 0.3163 1.9 9.0 4U 1735-44
268.4326 -1.4556 6.0 53.6 178.6 1.1637 1.9 3.9 SW J1753.5-0127
270.1993 -24.9225 6.9 32.8 -164.8 0.3488 1.7 10.5 GX 5-1
270.2817 -25.7195 2.4 32.2 -163.9 0.9945 4.9 1.8 GRS 1758-258
274.1016 -14.0019 4.1 44.2 -168.1 0.8961 2.8 5.9 GX 17+2
275.9046 -30.4423 7.4 31.3 -151.0 0.3090 1.6 4.6 H1820-303
284.9013 -25.0362 441.4 40.5 -146.4 0.0076 0.0 10.1 HT1900.1-2455
263.0008 -33.7670 3.2 22.0 -166.2 0.6806 3.6 4.1 GX 354-0
285.5868 -47.8466 2.3 26.9 -112.4 1.2107 5.2 ------ UNKNOWN
284.6095 -2.3423 4.2 59.3 -163.2 4.0533 2.8 ------ UNKNOWN
297.4439 -19.9970 2.7 51.8 -138.5 4.1197 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.404000 5.716000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4322 -60.5077 7.9 40.2 14.7 0.0585 1.5 7.7 Cen X-3
186.3074 -62.6697 0.0 32.4 14.1 0.0740 2.4 11.3 GX 301-2
244.7676 -15.6973 4.5 35.2 148.9 -0.1033 -2.6 12.7 Sco X-1
256.1024 -37.9232 3.7 15.6 -174.4 0.0757 3.1 7.3 4U 1700-377
256.5266 -36.5256 5.6 16.9 -175.7 -0.0496 -2.1 7.6 GX 349+2
262.8608 -24.8549 7.6 29.8 -176.2 0.0470 1.5 10.4 GX 1+4
264.9106 -44.5674 12.1 15.3 -138.7 -0.0231 -0.9 10.1 4U 1735-44
268.4296 -1.5401 14.6 53.5 178.6 -0.0656 -0.8 6.4 SW J1753.5-0127
270.4246 -25.0974 9.5 32.8 -164.3 -0.0358 -1.2 7.7 GX 5-1
270.2267 -25.5663 7.2 32.3 -164.1 0.0473 1.7 11.4 GRS 1758-258
273.8743 -14.1198 3.0 44.0 -168.3 0.1614 3.9 9.1 GX 17+2
275.9546 -30.2236 8.8 31.4 -151.2 0.0398 1.3 8.7 H1820-303
285.1401 -24.8742 9.9 40.8 -146.3 -0.0475 -1.2 6.3 HT1900.1-2455
263.1825 -33.7933 6.2 22.1 -165.8 0.0494 1.9 10.0 GX 354-0
170.1975 -47.3859 2.3 46.4 31.7 0.3691 5.0 ------ UNKNOWN
267.5623 -30.1719 2.2 27.1 -163.2 0.1343 5.3 ------ UNKNOWN
269.5569 -63.8059 0.8 18.6 -68.9 0.4012 14.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
52.044610 808.044600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3533 -60.6744 3.8 41.6 39.9 3.0516 3.1 3.3 Cen X-3
186.6434 -62.7598 0.6 34.6 46.2 11.7013 18.7 0.7 GX 301-2
255.9641 -37.8432 5.0 27.2 149.3 1.0850 2.3 1.1 4U 1700-377
256.5661 -36.4109 4.0 28.5 151.0 1.4472 2.9 6.3 GX 349+2
263.0031 -24.7292 3.0 39.3 163.8 2.7206 3.8 1.0 GX 1+4
264.7624 -44.4332 4.9 19.5 163.0 0.8921 2.3 1.3 4U 1735-44
270.2093 -25.1285 3.0 38.7 174.2 2.0820 3.8 5.0 GX 5-1
270.2587 -25.7475 2.7 38.0 174.3 2.3264 4.3 2.4 GRS 1758-258
274.1026 -14.0788 11.9 49.8 179.0 0.8656 1.0 6.2 GX 17+2
276.0662 -30.5223 0.0 33.5 -176.6 0.8500 2.0 11.8 H1820-303
285.1108 -24.9918 10.5 40.1 -164.6 0.6602 1.1 5.9 HT1900.1-2455
262.8696 -33.7655 5.0 30.3 162.2 1.1075 2.3 7.3 GX 354-0
251.4864 -45.5979 2.1 20.8 135.6 2.1415 5.4 ------ UNKNOWN
97.4011 -71.4810 3.6 44.6 -3.3 2.6666 3.2 ------ UNKNOWN
307.2384 -44.3064 3.1 28.8 -121.3 1.9342 3.6 ------ UNKNOWN
344.2546 -53.3979 4.8 37.9 -76.4 2.6626 2.4 ------ UNKNOWN
20.4103 -56.7917 3.3 48.4 -50.0 10.0715 3.6 ------ UNKNOWN
342.3738 -48.1350 3.4 41.0 -83.4 7.7586 3.4 ------ UNKNOWN
Plot creation:
Sun May 31 10:38:52 EDT 2015