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
112.7494 -54.0914 0.0081 31.9575 -174.8748 0.2720716 23.716 TRIG_00375409
Foreground time interval of the image:
-0.004 0.332 (delta_t = 0.336 [sec])
Background time interval of the image:
-239.404 -0.004 (delta_t = 239.400 [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 0.064000
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 0.064000
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 0.064000
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 -0.004 sec. to 0.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.710257 ( -0.131777 0.127783 )
Norm@50keV : 4.76927E-02 ( -0.00367889 0.00364937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 57 degrees of freedom
# Null hypothesis probability = 5.806898e-01
Photon flux (15-150 keV) in 0.336 sec: 5.50851 ( -0.408538 0.408852 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94704e-07 ( -1.54774e-08 1.55276e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.399876 ( -0.589152 0.436714 )
Epeak [keV] : 310.464 ( -310.473 -310.473 )
Norm@50keV : 6.47158E-02 ( -0.0194969 0.0482301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.20 using 59 PHA bins.
# Reduced chi-squared = 0.9500 for 56 degrees of freedom
# Null hypothesis probability = 5.816291e-01
Photon flux (15-150 keV) in 0.336 sec: 5.46135 ( -0.41733 0.4165 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92699e-07 ( -1.63057e-08 1.61018e-08 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.713353 ( -0.128294 0.132603 )
Epeak [keV] : 20.5288 ( -19.4024 -19.4024 )
Norm@50keV : 7466.01 ( -399.418 4.65445e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.12 using 59 PHA bins.
# Reduced chi-squared = 0.9841 for 55 degrees of freedom
# Null hypothesis probability = 5.081087e-01
Photon flux (15-150 keV) in 0.336 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] : 26.0776 (-2.6709 3.20087)
R^2/D10^2 : 0.126801 (-0.0361945 0.04766)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.31 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.615619e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.920e-09 7.678e-10
25- 50 2.850e-08 3.125e-09
50-150 1.427e-07 1.781e-08
15-150 1.761e-07 1.806e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 20.2977 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 162.16 using 59 PHA bins.
# Reduced chi-squared = 2.8450 for 57 degrees of freedom
# Null hypothesis probability = 5.006927e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.698e-08 2.518e-09
25- 50 3.267e-08 8.279e-09
50-150 7.165e-08 3.665e-08
15-150 1.213e-07 4.276e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 16.3380 (-5.25709 3.41358)
R1^2/D10^2 : 0.362139 (-0.119885 0.579647)
kT2 [keV] : 199.591 ( )
R2^2/D10^2 : 1.05389E-03 (-0.000312973 0.0347488)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.09 using 59 PHA bins.
#Fit statistic : Chi-Squared = 51.99 using 59 PHA bins.
# Reduced chi-squared = 0.9472 for 55 degrees of freedom
# Reduced chi-squared = 0.9453 for 55 degrees of freedom
# Null hypothesis probability = 5.863550e-01
# Null hypothesis probability = 5.903084e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.362e-09 2.612e-09
25- 50 3.238e-08 1.393e-08
50-150 1.505e-07 9.250e-08
15-150 1.902e-07 1.036e-07
Peak spectrum fit
Power-law model
Time interval is from -0.334 sec. to 0.666 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.768475 ( -0.174528 0.16731 )
Norm@50keV : 1.64925E-02 ( -0.00162752 0.00160429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.59 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 57 degrees of freedom
# Null hypothesis probability = 2.286291e-01
Photon flux (15-150 keV) in 1 sec: 1.89805 ( -0.180112 0.180767 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9533e-07 ( -1.90302e-08 1.91162e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.334 sec. to 0.666 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.761133 ( -0.176406 0.168571 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.66111E-02 ( -0.00153649 0.0162817 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.59 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 56 degrees of freedom
# Null hypothesis probability = 2.016352e-01
Photon flux (15-150 keV) in 1 sec: 1.89761 ( -0.18541 0.17998 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95403e-07 ( -1.9583e-08 1.8936e-08 ) ergs/cm2
Band function
Time interval is from -0.334 sec. to 0.666 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.845381 ( 0.845381 0.845381 )
beta : -0.768475 ( -0.167212 0.174734 )
Epeak [keV] : 15.5429 ( -15.5429 -15.5429 )
Norm@50keV : 2.37552E-02 ( -0.00883934 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.59 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 55 degrees of freedom
# Null hypothesis probability = 1.765019e-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] : 26.3847 (-3.39096 4.31223)
R^2/D10^2 : 4.10984E-02 (-0.0146666 0.0209879)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.99 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 57 degrees of freedom
# Null hypothesis probability = 2.398009e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.827e-09 1.013e-09
25- 50 2.812e-08 4.160e-09
50-150 1.438e-07 2.140e-08
15-150 1.767e-07 2.260e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 7.47904 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 123.56 using 59 PHA bins.
# Reduced chi-squared = 2.1677 for 57 degrees of freedom
# Null hypothesis probability = 8.048684e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.862e-08 1.030e-08
25- 50 3.582e-08 1.650e-08
50-150 7.857e-08 4.275e-08
15-150 1.330e-07 7.180e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 15.6299 (-6.61372 4.75634)
R1^2/D10^2 : 0.139506 (-0.0714633 0.108717)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 3.73235E-04 (-0.00012465 7.9887e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.39 using 59 PHA bins.
#Fit statistic : Chi-Squared = 65.12 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.593501e-01
# Null hypothesis probability = 1.651152e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.821e-09 4.247e-09
25- 50 3.325e-08 1.730e-08
50-150 1.510e-07 1.124e-07
15-150 1.920e-07 1.363e-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: 0.710257 ( -0.131777 0.127783 )
Norm@50keV : 4.76927E-02 ( -0.00367889 0.00364937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 57 degrees of freedom
# Null hypothesis probability = 5.806898e-01
Photon flux (15-150 keV) in 0.336 sec: 5.50851 ( -0.408538 0.408852 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94704e-07 ( -1.54774e-08 1.55276e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.399876 ( -0.589152 0.436714 )
Epeak [keV] : 310.464 ( -310.473 -310.473 )
Norm@50keV : 6.47158E-02 ( -0.0194969 0.0482301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.20 using 59 PHA bins.
# Reduced chi-squared = 0.9500 for 56 degrees of freedom
# Null hypothesis probability = 5.816291e-01
Photon flux (15-150 keV) in 0.336 sec: 5.46135 ( -0.41733 0.4165 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92699e-07 ( -1.63057e-08 1.61018e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.713353 ( -0.128294 0.132603 )
Epeak [keV] : 20.5288 ( -19.4024 -19.4024 )
Norm@50keV : 7466.01 ( -436.258 4.65445e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.12 using 59 PHA bins.
# Reduced chi-squared = 0.9841 for 55 degrees of freedom
# Null hypothesis probability = 5.081087e-01
Photon flux (15-150 keV) in 0.336 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) = 2.94e-08
S(50-100 keV) = 7.19e-08
T90 vs. Hardness ratio plot
T90 = 0.271999955177307 sec.
Hardness ratio (energy fluence ratio) = 2.44558
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.35625
Count Ratio (50-100 keV) / (15-25 keV) = 2.97717
Mask shadow pattern
IMX = -6.213440742491267E-01, IMY = 5.572910654887778E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-239.404000 -0.004000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5532 -40.5544 1.4 51.8 -168.0 4.0370 8.0 1.1 Vela X-1
170.5960 -60.5919 8.4 45.7 -129.5 0.8915 1.4 8.5 Cen X-3
116.0482 -47.9734 3.0 38.0 -178.8 0.9571 3.9 ------ UNKNOWN
139.7758 -43.2276 2.4 51.1 -162.8 2.2457 4.9 ------ UNKNOWN
320.7932 -40.5525 2.5 52.9 -21.3 2.2270 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.004000 0.332000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6189 -40.5281 53.3 51.9 -168.0 0.0052 0.2 4.4 Vela X-1
170.2537 -60.7571 5.2 45.5 -129.6 -0.0682 -2.2 8.3 Cen X-3
112.7494 -54.0914 0.5 32.0 -174.9 0.2721 23.7 ------ UNKNOWN
187.1926 -69.7116 2.5 40.6 -114.5 0.1242 4.6 ------ UNKNOWN
292.4982 -60.7538 2.2 44.6 -55.2 0.1841 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
62.096640 962.663700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5125 -40.5611 0.4 20.4 -150.0 14.6829 28.2 0.8 Vela X-1
170.3465 -60.5676 2.5 30.7 -82.1 3.4539 4.6 3.4 Cen X-3
186.6416 -62.7633 3.0 37.4 -74.1 5.9443 3.8 0.6 GX 301-2
42.9070 -41.5904 3.8 46.4 47.9 6.9562 3.1 ------ UNKNOWN
22.9112 -61.0408 3.1 44.8 15.7 3.3699 3.8 ------ UNKNOWN
353.5617 -58.9912 3.4 56.8 4.8 10.2064 3.4 ------ UNKNOWN
355.9480 -60.1459 3.7 55.2 5.1 7.3370 3.1 ------ UNKNOWN
74.9433 -74.9525 3.0 25.5 -6.1 1.9494 3.9 ------ UNKNOWN
140.4742 -1.7463 2.8 57.1 -174.0 10.2911 4.1 ------ UNKNOWN
331.1273 -64.8917 5.3 57.4 -9.5 5.0496 2.2 ------ UNKNOWN
151.7463 -22.7179 2.7 42.9 -149.1 3.7722 4.3 ------ UNKNOWN
Plot creation:
Sun May 31 02:36:47 EDT 2015