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
314.2230 -62.4366 0.0051 11.9906 -34.9244 1.9317205 37.938 TRIG_00319036
Foreground time interval of the image:
-6.512 15.573 (delta_t = 22.085 [sec])
Background time interval of the image:
-239.728 -6.512 (delta_t = 233.216 [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 -6.512 sec. to 131.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51567 ( -0.0808513 0.0811204 )
Norm@50keV : 2.02720E-03 ( -8.60568e-05 8.57587e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 0.9960 for 57 degrees of freedom
# Null hypothesis probability = 4.835136e-01
Photon flux (15-150 keV) in 138 sec: 0.254156 ( -0.011029 0.0110608 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64723e-06 ( -1.23383e-07 1.24019e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.512 sec. to 131.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51322 ( -0.195723 0.109005 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 2.03299E-03 ( -8.42665e-05 8.41075e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.79 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 56 degrees of freedom
# Null hypothesis probability = 4.453515e-01
Photon flux (15-150 keV) in 138 sec: 0.254221 ( -0.011216 0.010882 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64684e-06 ( -1.23758e-07 1.22268e-07 ) ergs/cm2
Band function
Time interval is from -6.512 sec. to 131.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.778793 ( 1.08716 1.08716 )
beta : -1.53008 ( -0.100578 0.0880129 )
Epeak [keV] : 42.2784 ( -42.2184 583.077 )
Norm@50keV : 7.04162E-03 ( -0.00715889 460.101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.54 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.172656e-01
Photon flux (15-150 keV) in 138 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] : 15.7288 ( )
R^2/D10^2 : 2.31152E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 222.38 using 59 PHA bins.
# Reduced chi-squared = 3.9014 for 57 degrees of freedom
# Null hypothesis probability = 2.193746e-21
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.638e-07 1.387e-08
25- 50 6.790e-07 3.926e-08
50-150 1.166e-06 1.001e-07
15-150 2.009e-06 1.069e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.03210 (-0.0427813 0.042781)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.763337e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.547e-07 1.518e-08
25- 50 6.823e-07 3.091e-08
50-150 1.496e-06 6.486e-08
15-150 2.533e-06 1.283e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.35092 (-0.717083 0.797207)
R1^2/D10^2 : 0.395790 (-0.14018 0.232578)
kT2 [keV] : 27.6896 (-3.16514 4.26537)
R2^2/D10^2 : 2.80079E-03 (-0.00105608 0.00145112)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.75 using 59 PHA bins.
# Reduced chi-squared = 0.9227 for 55 degrees of freedom
# Null hypothesis probability = 6.377323e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.649e-07 4.388e-08
25- 50 6.458e-07 5.568e-08
50-150 1.653e-06 2.035e-07
15-150 2.664e-06 2.670e-07
Peak spectrum fit
Power-law model
Time interval is from 2.300 sec. to 3.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.579819 ( -0.204226 0.192157 )
Norm@50keV : 8.86654E-03 ( -0.00111754 0.00109626 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.35 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 57 degrees of freedom
# Null hypothesis probability = 3.229293e-01
Photon flux (15-150 keV) in 1 sec: 1.03786 ( -0.118924 0.119364 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14495e-07 ( -1.32404e-08 1.32846e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.300 sec. to 3.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.629893 ( -1.26104 0.956168 )
Epeak [keV] : 138.211 ( -39.1404 252.662 )
Norm@50keV : 2.64318E-02 ( -0.0150495 0.0481574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 56 degrees of freedom
# Null hypothesis probability = 4.586670e-01
Photon flux (15-150 keV) in 1 sec: 0.998480 ( -0.123428 0.12352 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10422e-07 ( -1.45112e-08 1.4232e-08 ) ergs/cm2
Band function
Time interval is from 2.300 sec. to 3.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.584209 ( -0.192474 0.204428 )
Epeak [keV] : 20.2812 ( -18.5323 -18.5323 )
Norm@50keV : 1288.83 ( -141.032 770190 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.28 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.610432e-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] : 28.5940 (-3.9992 5.23728)
R^2/D10^2 : 1.91602E-02 (-0.00722663 0.0105353)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.48 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.573593e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.523e-09 6.180e-10
25- 50 1.525e-08 2.890e-09
50-150 8.961e-08 1.577e-08
15-150 1.074e-07 1.687e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.80749 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.69 using 59 PHA bins.
# Reduced chi-squared = 2.2052 for 57 degrees of freedom
# Null hypothesis probability = 4.377914e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.481e-09 5.390e-09
25- 50 1.824e-08 1.014e-08
50-150 4.000e-08 2.232e-08
15-150 6.772e-08 3.783e-08
Double BB
R1^2/D10^2 : 3.18120E-02 (-0.0326897 -0.0326897)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.32756E-04 (-0.000132785 -0.000132785)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.48 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.64 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.48 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 3.835419e-01
# Null hypothesis probability = 4.503604e-01
# Null hypothesis probability = 4.564807e-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: 0.799183 ( -0.0688414 0.0677543 )
Norm@50keV : 5.75713E-03 ( -0.000233018 0.00023195 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.72 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.373700e-01
Photon flux (15-150 keV) in 22.08 sec: 0.661698 ( -0.0261492 0.0261904 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48599e-06 ( -5.95453e-08 5.96319e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.51647E-02 ( -0.336316 0.310512 )
Epeak [keV] : 164.469 ( -32.7177 74.0292 )
Norm@50keV : 1.13355E-02 ( -0.0027773 0.00395725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.29 using 59 PHA bins.
# Reduced chi-squared = 0.9158 for 56 degrees of freedom
# Null hypothesis probability = 6.535757e-01
Photon flux (15-150 keV) in 22.08 sec: 0.641420 ( -0.027405 0.027454 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44805e-06 ( -6.34668e-08 6.31709e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.800851 ( -0.0677611 0.0691367 )
Epeak [keV] : 18.7867 ( -18.0026 9979.23 )
Norm@50keV : 1656.64 ( -62.1142 591173 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.56 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 55 degrees of freedom
# Null hypothesis probability = 1.035213e-01
Photon flux (15-150 keV) in 22.08 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) = 6.60e-07
S(50-100 keV) = 9.23e-07
T90 vs. Hardness ratio plot
T90 = 106.624000012875 sec.
Hardness ratio (energy fluence ratio) = 1.39848
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.22223
Count Ratio (50-100 keV) / (15-25 keV) = 0.949694
Mask shadow pattern
IMX = 1.741365060462937E-01, IMY = 1.215893857885950E-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:
-239.728000 -6.512000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0443 -37.7596 4.2 50.8 8.0 1.3435 2.7 5.8 4U 1700-377
256.4771 -36.3710 4.7 51.5 9.6 -1.3210 -2.5 3.7 GX 349+2
264.7311 -44.4512 33.1 41.5 6.5 0.0953 0.3 0.5 4U 1735-44
270.3765 -25.6387 4.8 50.9 30.1 1.9830 2.4 7.4 GRS 1758-258
275.7555 -30.3514 11.5 44.3 30.6 0.3885 1.0 8.8 H1820-303
285.1307 -24.9539 4.3 43.0 44.9 1.3647 2.7 5.5 HT1900.1-2455
263.1043 -33.9565 13.1 49.3 16.7 0.4338 0.9 9.3 GX 354-0
26.3358 -16.0039 2.4 58.1 -175.6 5.0351 4.7 ------ UNKNOWN
208.3459 -68.4816 3.2 50.7 -44.6 3.7079 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.512000 15.572610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.1195 -37.8067 3.5 50.8 8.0 -0.5032 -3.3 6.7 4U 1700-377
256.4096 -36.3623 6.4 51.6 9.6 0.3048 1.8 3.9 GX 349+2
264.4748 -44.4784 0.0 41.7 6.3 -0.1438 -1.7 11.6 4U 1735-44
270.1378 -25.7544 3.4 51.0 29.8 0.8845 3.4 8.9 GRS 1758-258
275.9846 -30.2603 5.6 44.2 30.9 0.2732 2.1 7.1 H1820-303
285.0074 -24.9651 27.8 43.0 44.7 0.0714 0.4 3.1 HT1900.1-2455
262.8739 -33.8523 10.2 49.5 16.6 0.1785 1.1 5.8 GX 354-0
314.2230 -62.4366 0.3 12.0 -34.9 1.9318 37.9 ------ UNKNOWN
289.8638 -66.8312 2.5 23.1 -29.8 0.2392 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
51.772590 422.372000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9842 -37.8450 42.1 42.6 5.4 0.6329 0.3 0.1 4U 1700-377
256.5724 -36.5259 21.7 43.4 7.0 -1.2587 -0.5 9.0 GX 349+2
263.1337 -24.8369 31.3 50.5 22.0 1.7972 0.4 8.7 GX 1+4
264.9835 -44.4876 8.6 33.2 7.5 2.3303 1.3 10.5 4U 1735-44
270.4776 -25.0918 23.5 47.2 29.7 -1.9671 -0.5 10.5 GX 5-1
270.3083 -25.7019 6.3 46.8 29.1 7.1700 1.8 2.5 GRS 1758-258
275.8632 -30.2065 0.0 40.6 32.7 0.5534 0.2 10.1 H1820-303
285.1902 -24.9427 5.1 42.2 47.3 -8.9669 -2.3 8.5 HT1900.1-2455
263.1007 -33.7624 4.8 42.8 15.8 6.2160 2.4 7.1 GX 354-0
277.4083 -23.7949 3.1 45.8 38.4 16.0736 3.7 ------ UNKNOWN
295.2957 -28.0862 2.3 36.5 59.5 15.2112 4.9 ------ UNKNOWN
257.5981 -31.6568 2.1 47.0 11.8 16.0681 5.5 ------ UNKNOWN
22.1302 -46.0447 2.3 40.6 -172.8 10.2014 5.0 ------ UNKNOWN
Plot creation:
Sun May 31 06:41:28 EDT 2015