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
88.7537 -15.2589 0.0022 29.3945 -177.0203 7.5304324 86.810 TRIG_00430151
Foreground time interval of the image:
-15.571 13.229 (delta_t = 28.800 [sec])
Background time interval of the image:
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)
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 -79.008 sec. to 333.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12258 ( -0.0233831 0.0232794 )
Norm@50keV : 8.70306E-03 ( -0.000118695 0.000118231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 23.19 using 59 PHA bins.
# Reduced chi-squared = 0.4068 for 57 degrees of freedom
# Null hypothesis probability = 9.999803e-01
Photon flux (15-150 keV) in 412.6 sec: 1.01182 ( -0.0151347 0.0151999 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72774e-05 ( -4.42794e-07 4.42716e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -79.008 sec. to 333.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11737 ( -0.0242613 0.0228154 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 8.74773E-03 ( -0.000119986 0.000103902 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 23.33 using 59 PHA bins.
# Reduced chi-squared = 0.4166 for 56 degrees of freedom
# Null hypothesis probability = 9.999653e-01
Photon flux (15-150 keV) in 412.6 sec: 1.01118 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72899e-05 ( -4.42348e-07 4.42967e-07 ) ergs/cm2
Band function
Time interval is from -79.008 sec. to 333.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.794267 ( 0.787793 5.77675 )
beta : -1.12279 ( 1.123 0.0236623 )
Epeak [keV] : 74.2714 ( -80.512 -80.512 )
Norm@50keV : 1.62730E-02 ( -0.00755356 353647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 23.18 using 59 PHA bins.
# Reduced chi-squared = 0.4214 for 55 degrees of freedom
# Null hypothesis probability = 9.999510e-01
Photon flux (15-150 keV) in 412.6 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] : 25.2101 ( )
R^2/D10^2 : 2.21301E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1224.38 using 59 PHA bins.
# Reduced chi-squared = 21.4803 for 57 degrees of freedom
# Null hypothesis probability = 1.073881e-218
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.004e-06 2.826e-08
25- 50 5.718e-06 1.238e-07
50-150 2.691e-05 3.878e-07
15-150 3.364e-05 4.291e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 4.64585 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1334.94 using 59 PHA bins.
# Reduced chi-squared = 23.4200 for 57 degrees of freedom
# Null hypothesis probability = 1.129890e-241
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.773e-06 7.014e-08
25- 50 9.182e-06 1.382e-07
50-150 2.014e-05 2.847e-07
15-150 3.409e-05 4.724e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.93874 (-0.494184 0.519936)
R1^2/D10^2 : 0.365511 (-0.0619203 0.0775786)
kT2 [keV] : 38.4510 (-1.77306 2.07117)
R2^2/D10^2 : 5.05444E-03 (-0.000771221 0.000828854)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.11 using 59 PHA bins.
# Reduced chi-squared = 0.6747 for 55 degrees of freedom
# Null hypothesis probability = 9.693381e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.747e-06 1.432e-07
25- 50 7.674e-06 1.795e-07
50-150 2.692e-05 5.261e-07
15-150 3.735e-05 6.498e-07
Peak spectrum fit
Power-law model
Time interval is from 28.264 sec. to 29.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.700784 ( -0.0775793 0.0762993 )
Norm@50keV : 4.32418E-02 ( -0.00188355 0.00187153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.64 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 57 degrees of freedom
# Null hypothesis probability = 1.057685e-01
Photon flux (15-150 keV) in 1 sec: 4.99804 ( -0.207366 0.207676 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27638e-07 ( -2.32889e-08 2.3369e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 28.264 sec. to 29.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.694253 ( -0.079762 0.0754366 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.35902E-02 ( -0.00178251 0.00844076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.71 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 56 degrees of freedom
# Null hypothesis probability = 8.917755e-02
Photon flux (15-150 keV) in 1 sec: 4.99668 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27778e-07 ( -2.3174e-08 2.3131e-08 ) ergs/cm2
Band function
Time interval is from 28.264 sec. to 29.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00167 ( 1.00167 1.00167 )
beta : -0.700784 ( -0.0762604 0.0776502 )
Epeak [keV] : 19.2703 ( -19.2703 -19.2703 )
Norm@50keV : 5.57726E-02 ( -0.0142272 814455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.64 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 55 degrees of freedom
# Null hypothesis probability = 7.608269e-02
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] : 28.8825 ( )
R^2/D10^2 : 8.49383E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 160.57 using 59 PHA bins.
# Reduced chi-squared = 2.8170 for 57 degrees of freedom
# Null hypothesis probability = 8.504424e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.134e-08 9.850e-10
25- 50 6.886e-08 4.640e-09
50-150 4.114e-07 2.460e-08
15-150 4.917e-07 2.420e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 18.9913 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 399.23 using 59 PHA bins.
# Reduced chi-squared = 7.0041 for 57 degrees of freedom
# Null hypothesis probability = 7.387864e-53
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.729e-08 2.195e-09
25- 50 9.097e-08 4.465e-09
50-150 1.995e-07 1.080e-08
15-150 3.378e-07 1.860e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.86586 (-1.46155 1.91345)
R1^2/D10^2 : 1.93478 (-0.938372 1.93017)
kT2 [keV] : 42.2882 (-5.52114 9.11881)
R2^2/D10^2 : 2.70219E-02 (-0.0109564 0.0129051)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.61 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 55 degrees of freedom
# Null hypothesis probability = 7.649329e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.736e-08 6.410e-09
25- 50 7.781e-08 1.211e-08
50-150 4.330e-07 4.905e-08
15-150 5.382e-07 4.925e-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: 0.970547 ( -0.0352324 0.0350234 )
Norm@50keV : 1.74991E-02 ( -0.000345262 0.000343779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.04 using 59 PHA bins.
# Reduced chi-squared = 0.7200 for 57 degrees of freedom
# Null hypothesis probability = 9.450389e-01
Photon flux (15-150 keV) in 28.8 sec: 2.01191 ( -0.0406863 0.0408355 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50771e-06 ( -1.03795e-07 1.0384e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.884615 ( -0.141496 0.0522346 )
Epeak [keV] : 831.915 ( -831.918 -831.918 )
Norm@50keV : 1.89091E-02 ( -0.000608201 0.00250205 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.92 using 59 PHA bins.
# Reduced chi-squared = 0.7128 for 56 degrees of freedom
# Null hypothesis probability = 9.485832e-01
Photon flux (15-150 keV) in 28.8 sec: 2.00105 ( -0.04387 0.0428 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4966e-06 ( -1.06704e-07 1.06272e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.791485 ( 0.791484 0.791484 )
beta : -0.970544 ( -0.0350188 0.0352394 )
Epeak [keV] : 51.3768 ( )
Norm@50keV : 2.93193E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.04 using 59 PHA bins.
# Reduced chi-squared = 0.7462 for 55 degrees of freedom
# Null hypothesis probability = 9.190609e-01
Photon flux (15-150 keV) in 28.8 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) = 7.47e-06
S(50-100 keV) = 1.37e-05
T90 vs. Hardness ratio plot
T90 = 193.383999943733 sec.
Hardness ratio (energy fluence ratio) = 1.834
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.61142
Count Ratio (50-100 keV) / (15-25 keV) = 1.60577
Mask shadow pattern
IMX = -5.625835373988104E-01, IMY = 2.928403708244022E-02
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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.571410 13.228580
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5846 -40.4930 2.6 18.5 12.1 0.3539 4.5 4.5 Vela X-1
170.5645 -60.5169 3.9 46.1 32.4 0.6861 3.0 9.7 Cen X-3
82.9128 -65.8669 2.6 40.0 86.6 1.4257 4.4 ------ UNKNOWN
79.6909 -20.7412 1.9 33.9 165.5 0.6062 6.0 ------ UNKNOWN
88.7537 -15.2589 0.1 29.4 -177.0 7.5305 86.8 ------ UNKNOWN
80.7420 -6.9068 2.6 40.8 -174.5 0.5051 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
65.828600 962.828500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6278 22.0192 0.2 37.6 -146.8 35.0718 48.3 0.4 Crab
135.5223 -40.5409 1.7 47.7 -7.5 7.0920 6.8 0.9 Vela X-1
93.3659 -61.1223 3.2 46.0 37.9 6.8725 3.6 ------ UNKNOWN
112.7525 -56.1962 2.8 44.8 22.3 4.3962 4.2 ------ UNKNOWN
74.6165 -3.5001 2.5 18.2 169.8 2.2619 4.7 ------ UNKNOWN
88.7610 -15.2598 0.3 0.0 -76.7 22.3001 41.8 ------ UNKNOWN
84.7224 26.3547 1.7 41.8 -144.4 5.9298 6.7 ------ UNKNOWN
Plot creation:
Sun May 31 00:43:11 EDT 2015