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
328.6731 -53.1895 0.0078 45.8481 158.5852 3.1199011 24.663 TRIG_00319016
Foreground time interval of the image:
-0.352 11.237 (delta_t = 11.589 [sec])
Background time interval of the image:
-239.664 -0.352 (delta_t = 239.312 [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 -0.352 sec. to 112.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08729 ( -0.104098 0.102103 )
Norm@50keV : 3.19232E-03 ( -0.000185688 0.000184387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8396 for 57 degrees of freedom
# Null hypothesis probability = 8.005593e-01
Photon flux (15-150 keV) in 113.2 sec: 0.369843 ( -0.0227895 0.0229227 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79368e-06 ( -2.12415e-07 2.12662e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.352 sec. to 112.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08150 ( -0.430703 0.118299 )
Epeak [keV] : 9999.99 ( )
Norm@50keV : 3.20960E-03 ( -0.00018575 0.000174597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.85 using 59 PHA bins.
# Reduced chi-squared = 0.8545 for 56 degrees of freedom
# Null hypothesis probability = 7.725379e-01
Photon flux (15-150 keV) in 113.2 sec: 0.369681 ( -0.025071 0.022912 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78888e-06 ( -2.14718e-07 2.18318e-07 ) ergs/cm2
Band function
Time interval is from -0.352 sec. to 112.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.856973 ( 0.857003 0.857003 )
beta : -1.08729 ( -0.101982 0.104228 )
Epeak [keV] : 55.8122 ( -55.7907 -55.7907 )
Norm@50keV : 5.66724E-03 ( -0.00208789 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8701 for 55 degrees of freedom
# Null hypothesis probability = 7.417399e-01
Photon flux (15-150 keV) in 113.2 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] : 24.2502 (-1.79247 2.01505)
R^2/D10^2 : 9.32723E-03 (-0.00209972 0.00262865)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.93 using 59 PHA bins.
# Reduced chi-squared = 1.8409 for 57 degrees of freedom
# Null hypothesis probability = 1.144996e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.096e-07 1.394e-08
25- 50 6.120e-07 5.779e-08
50-150 2.679e-06 2.224e-07
15-150 3.400e-06 2.270e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.61905 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.57 using 59 PHA bins.
# Reduced chi-squared = 2.0276 for 57 degrees of freedom
# Null hypothesis probability = 7.312917e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.564e-07 3.039e-08
25- 50 8.779e-07 6.034e-08
50-150 1.925e-06 3.062e-07
15-150 3.260e-06 4.160e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.43022 (-1.40002 1.81108)
R1^2/D10^2 : 0.394591 (-0.235099 0.668985)
kT2 [keV] : 31.9189 (-3.79449 5.61349)
R2^2/D10^2 : 3.59127E-03 (-0.00144489 0.00182724)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.37 using 59 PHA bins.
# Reduced chi-squared = 0.8248 for 55 degrees of freedom
# Null hypothesis probability = 8.196299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.316e-07 1.120e-07
25- 50 7.051e-07 1.669e-07
50-150 2.798e-06 3.554e-07
15-150 3.835e-06 5.813e-07
Peak spectrum fit
Power-law model
Time interval is from 1.604 sec. to 2.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31032 ( -0.24034 0.238197 )
Norm@50keV : 2.56359E-02 ( -0.00352884 0.00352854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.63 using 59 PHA bins.
# Reduced chi-squared = 0.7830 for 57 degrees of freedom
# Null hypothesis probability = 8.831824e-01
Photon flux (15-150 keV) in 1 sec: 3.06433 ( -0.444482 0.446716 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52697e-07 ( -3.72758e-08 3.7497e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.604 sec. to 2.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01661 ( -1.09073 0.516144 )
Epeak [keV] : 183.637 ( -183.711 -183.711 )
Norm@50keV : 3.52087E-02 ( -0.0352026 0.0761767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.34 using 59 PHA bins.
# Reduced chi-squared = 0.7917 for 56 degrees of freedom
# Null hypothesis probability = 8.697521e-01
Photon flux (15-150 keV) in 1 sec: 3.02660 ( -0.45878 0.46085 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49292e-07 ( -4.0128e-08 3.9132e-08 ) ergs/cm2
Band function
Time interval is from 1.604 sec. to 2.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.160120 ( 0.109356 4.96901 )
beta : -1.54081 ( 1.52645 0.397828 )
Epeak [keV] : 59.9142 ( -59.3992 51.3186 )
Norm@50keV : 0.170311 ( -0.180032 418.81 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.46 using 59 PHA bins.
# Reduced chi-squared = 0.7901 for 55 degrees of freedom
# Null hypothesis probability = 8.694539e-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] : 17.3920 (-3.0453 3.88973)
R^2/D10^2 : 0.218036 (-0.107671 0.202722)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.63 using 59 PHA bins.
# Reduced chi-squared = 0.9584 for 57 degrees of freedom
# Null hypothesis probability = 5.645331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.334e-08 4.061e-09
25- 50 6.012e-08 1.445e-08
50-150 1.308e-07 3.633e-08
15-150 2.042e-07 4.290e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.8649 (-1.78931 1.78902)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.47 using 59 PHA bins.
# Reduced chi-squared = 0.8328 for 57 degrees of freedom
# Null hypothesis probability = 8.117299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.205e-08 1.846e-08
25- 50 6.165e-08 3.432e-08
50-150 1.352e-07 7.500e-08
15-150 2.289e-07 1.292e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.5608 (-3.37665 3.76676)
R1^2/D10^2 : 0.870387 (-0.508636 1.78079)
kT2 [keV] : 49.4856 (-26.9528 -52.2816)
R2^2/D10^2 : 5.52564E-03 (-0.00435682 0.0435001)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.72 using 59 PHA bins.
# Reduced chi-squared = 0.7768 for 55 degrees of freedom
# Null hypothesis probability = 8.860982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.158e-08 1.228e-08
25- 50 6.460e-08 3.546e-08
50-150 1.627e-07 8.280e-08
15-150 2.489e-07 1.253e-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: 1.13056 ( -0.0963895 0.0948834 )
Norm@50keV : 1.85255E-02 ( -0.00104513 0.00104128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.39 using 59 PHA bins.
# Reduced chi-squared = 0.8313 for 57 degrees of freedom
# Null hypothesis probability = 8.141361e-01
Photon flux (15-150 keV) in 11.59 sec: 2.15565 ( -0.128962 0.129494 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22345e-06 ( -1.24867e-07 1.24987e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.550187 ( -0.439521 0.39789 )
Epeak [keV] : 151.873 ( -40.1584 181.851 )
Norm@50keV : 3.23658E-02 ( -0.0100666 0.01604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.94 using 59 PHA bins.
# Reduced chi-squared = 0.7310 for 56 degrees of freedom
# Null hypothesis probability = 9.346164e-01
Photon flux (15-150 keV) in 11.59 sec: 2.09095 ( -0.13531 0.13598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18535e-06 ( -1.29866e-07 1.29333e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.550129 ( -0.256564 0.657258 )
beta : -10.0000 ( 10 3.19744e-14 )
Epeak [keV] : 151.844 ( -34.4059 181.993 )
Norm@50keV : 3.23670E-02 ( -0.0100697 0.0160329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.94 using 59 PHA bins.
# Reduced chi-squared = 0.7443 for 55 degrees of freedom
# Null hypothesis probability = 9.208543e-01
Photon flux (15-150 keV) in 11.59 sec: 2.10369 ( ) 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) = 7.43e-07
S(50-100 keV) = 1.40e-06
T90 vs. Hardness ratio plot
T90 = 37.8720000088215 sec.
Hardness ratio (energy fluence ratio) = 1.88425
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.55245
Count Ratio (50-100 keV) / (15-25 keV) = 1.96362
Mask shadow pattern
IMX = -9.589372706662448E-01, IMY = -3.760898952945209E-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:
-239.664000 -0.352000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9825 -15.6379 0.4 28.7 -36.9 6.8397 30.7 0.2 Sco X-1
255.9877 -37.8502 3.1 13.2 -95.1 0.7682 3.8 0.4 4U 1700-377
256.4674 -36.4365 3.0 12.4 -89.6 0.7698 3.9 1.7 GX 349+2
263.1509 -24.6669 16.2 10.1 -19.1 0.1246 0.7 9.1 GX 1+4
264.8966 -44.3221 13.9 12.8 -137.3 0.1564 0.8 10.1 4U 1735-44
268.2079 -1.3543 3.6 31.1 18.8 0.7112 3.2 11.3 SW J1753.5-0127
270.3559 -24.9439 3.9 7.4 21.3 0.5463 3.0 9.0 GX 5-1
270.3696 -25.8288 5.1 6.5 21.1 0.4239 2.3 6.3 GRS 1758-258
273.8139 -13.9863 4.3 18.6 33.2 0.5135 2.7 11.6 GX 17+2
275.9311 -30.3649 2.5 4.9 91.4 0.8789 4.5 0.3 H1820-303
284.8983 -25.0040 8.1 14.4 86.8 -0.3080 -1.4 9.0 HT1900.1-2455
263.0922 -33.8339 3.2 6.5 -81.7 0.7166 3.6 5.1 GX 354-0
327.8765 -39.2014 2.9 46.1 139.1 3.0169 4.0 ------ UNKNOWN
286.1352 6.0921 2.4 41.1 47.4 2.5788 4.9 ------ UNKNOWN
208.4083 -71.9101 3.7 50.9 -135.6 3.6196 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.352000 11.236600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9665 -15.4941 4.3 28.8 -36.7 0.1244 2.7 8.8 Sco X-1
255.8885 -37.9116 76.8 13.3 -95.3 0.0064 0.2 6.2 4U 1700-377
256.4868 -36.2594 6.5 12.4 -88.8 -0.0778 -1.8 10.1 GX 349+2
263.1052 -24.5537 284.4 10.2 -18.9 -0.0015 -0.0 12.7 GX 1+4
264.7765 -44.5722 3.7 13.1 -137.4 0.1223 3.1 7.5 4U 1735-44
268.2634 -1.3337 6.0 31.1 19.0 -0.0957 -1.9 9.5 SW J1753.5-0127
270.3731 -24.8919 31.4 7.4 21.4 0.0147 0.4 12.2 GX 5-1
270.2400 -25.6997 22.5 6.6 20.1 -0.0203 -0.5 4.3 GRS 1758-258
273.8279 -14.0136 9.2 18.5 33.3 -0.0514 -1.3 10.4 GX 17+2
275.8171 -30.4198 33.5 4.8 91.5 -0.0140 -0.3 6.4 H1820-303
285.1443 -24.9631 4.5 14.6 87.2 0.1177 2.6 6.4 HT1900.1-2455
263.0263 -33.7143 2.9 6.6 -80.6 0.1500 4.0 7.5 GX 354-0
328.6731 -53.1895 0.5 45.8 158.6 3.1200 24.7 ------ UNKNOWN
261.2148 -2.0594 2.1 31.6 5.3 0.2579 5.5 ------ UNKNOWN
326.9480 -71.7117 2.0 49.1 -176.5 0.5411 5.8 ------ UNKNOWN
263.1379 -74.1530 2.1 42.0 -153.3 0.3587 5.5 ------ UNKNOWN
233.6706 -5.1709 2.4 43.9 -36.1 0.3533 4.7 ------ UNKNOWN
202.9689 -78.7294 3.1 54.1 -143.4 0.7148 3.7 ------ UNKNOWN
222.4572 -26.7876 2.1 42.0 -71.7 0.8105 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
87.436600 962.426400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9610 -37.7252 4.5 50.9 8.0 3.2549 2.6 7.2 4U 1700-377
256.4659 -36.3281 7.6 51.5 9.7 2.0893 1.5 5.9 GX 349+2
264.7484 -44.4770 4.7 41.5 6.6 1.6141 2.5 1.6 4U 1735-44
270.2392 -25.8484 4.2 50.9 29.9 5.4183 2.7 7.2 GRS 1758-258
275.8514 -30.3308 2.9 44.2 30.8 4.1469 3.9 4.4 H1820-303
285.1053 -24.9657 5.7 43.0 44.9 2.5225 2.0 4.6 HT1900.1-2455
263.0130 -33.8607 3.1 49.4 16.8 4.1531 3.7 2.0 GX 354-0
341.0817 -47.3037 3.5 9.9 169.6 1.2836 3.3 ------ UNKNOWN
326.7799 -56.8035 2.7 3.8 -52.7 1.8842 4.4 ------ UNKNOWN
238.8310 -44.4972 2.8 55.8 -9.1 6.7723 4.2 ------ UNKNOWN
208.3047 -68.4781 4.8 50.7 -44.6 6.9363 2.4 ------ UNKNOWN
48.1654 -43.5586 3.5 50.9 -135.4 10.0354 3.3 ------ UNKNOWN
Plot creation:
Sun May 31 06:43:16 EDT 2015