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
20.7048 5.8473 0.0104 23.9756 -174.5894 0.6624661 18.565 TRIG_00432420
Foreground time interval of the image:
-1.172 10.877 (delta_t = 12.049 [sec])
Background time interval of the image:
-371.523 -324.793 (delta_t = 46.731 [sec])
-239.824 -1.172 (delta_t = 238.652 [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)
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 -1.172 sec. to 19.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16843 ( -0.171717 0.181097 )
Norm@50keV : 2.13507E-03 ( -0.000260766 0.000255937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.35 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 57 degrees of freedom
# Null hypothesis probability = 5.751408e-01
Photon flux (15-150 keV) in 20.58 sec: 0.347705 ( -0.0298872 0.0298915 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11384e-07 ( -4.32725e-08 4.42719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.172 sec. to 19.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82214 ( -0.8289 0.422199 )
Epeak [keV] : 19.8890 ( -19.4279 -19.8964 )
Norm@50keV : 3.45898E-03 ( -0.0022002 0.00761791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.64 using 59 PHA bins.
# Reduced chi-squared = 0.9578 for 56 degrees of freedom
# Null hypothesis probability = 5.648808e-01
Photon flux (15-150 keV) in 20.58 sec: 0.342622 ( -0.031419 0.03145 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93979e-07 ( -5.29976e-08 5.47613e-08 ) ergs/cm2
Band function
Time interval is from -1.172 sec. to 19.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.82304 ( -3.26145 0.110489 )
beta : -10.00000 ( 10 1.65201e-13 )
Epeak [keV] : 19.8547 ( -7.4567 20.7114 )
Norm@50keV : 3.45284E-03 ( -0.000295962 0.00762862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.64 using 59 PHA bins.
# Reduced chi-squared = 0.9752 for 55 degrees of freedom
# Null hypothesis probability = 5.268783e-01
Photon flux (15-150 keV) in 20.58 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99291e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.41669 (-0.867438 0.97356)
R^2/D10^2 : 0.304343 (-0.107495 0.166677)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.57 using 59 PHA bins.
# Reduced chi-squared = 1.396 for 57 degrees of freedom
# Null hypothesis probability = 2.580780e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.310e-08 1.168e-08
25- 50 1.585e-07 1.620e-08
50-150 4.907e-08 1.386e-08
15-150 2.907e-07 3.005e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.7815 (-10.9077 16.2288)
Norm : 1.98131 (-0.297536 0.38136)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.67 using 59 PHA bins.
# Reduced chi-squared = 0.9591 for 57 degrees of freedom
# Null hypothesis probability = 5.630181e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.913e-08 1.173e-08
25- 50 1.411e-07 1.309e-08
50-150 1.338e-07 3.355e-08
15-150 3.740e-07 4.353e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.42716 (-1.1838 1.28146)
R1^2/D10^2 : 1.32556 (-0.704942 2.05783)
kT2 [keV] : 18.3723 (-5.12476 11.7415)
R2^2/D10^2 : 9.23195E-03 (-0.0077544 0.0273807)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9609 for 55 degrees of freedom
# Null hypothesis probability = 5.572086e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.038e-07 3.013e-08
25- 50 1.323e-07 4.645e-08
50-150 1.518e-07 8.294e-08
15-150 3.879e-07 1.245e-07
Peak spectrum fit
Power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13831 ( -0.277482 0.307512 )
Norm@50keV : 6.00716E-03 ( -0.00125836 0.00121217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.762125e-01
Photon flux (15-150 keV) in 1 sec: 0.963350 ( -0.135865 0.135868 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60383e-08 ( -1.00541e-08 1.04292e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20452 ( -1.99174 -1.99174 )
Epeak [keV] : 123.185 ( )
Norm@50keV : 5.47900E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.73 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.418430e-01
Photon flux (15-150 keV) in 1 sec: 0.963035 ( -0.135867 0.135815 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59274e-08 ( -1.13041e-08 1.05353e-08 ) ergs/cm2
Band function
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.81326 ( -4.81326 -4.81326 )
beta : -2.27722 ( -0.428879 0.337006 )
Epeak [keV] : 20.8193 ( -20.8193 4.42746 )
Norm@50keV : 2664.62 ( -374.735 1.18152e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.05 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 55 degrees of freedom
# Null hypothesis probability = 3.300118e-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] : 8.01324 (-1.52412 1.8392)
R^2/D10^2 : 1.01844 (-0.562382 1.34228)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.75 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 57 degrees of freedom
# Null hypothesis probability = 5.741218e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.184e-08 3.232e-09
25- 50 2.078e-08 4.730e-09
50-150 5.487e-09 2.556e-09
15-150 3.811e-08 8.370e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 51.7730 (-18.5736 36.2415)
Norm : 5.33599 (-1.23576 1.8338)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.55 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.165132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.315e-08 2.390e-09
25- 50 1.912e-08 3.985e-09
50-150 1.917e-08 8.122e-09
15-150 5.144e-08 1.075e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.90514 (-1.31615 1.7246)
R1^2/D10^2 : 5.85879 (-4.02828 15.9364)
kT2 [keV] : 20.1891 (-7.48514 21.99)
R2^2/D10^2 : 2.03283E-02 (-0.0185241 0.0679733)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.00 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.316682e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.478e-08 7.435e-09
25- 50 1.619e-08 8.635e-09
50-150 2.444e-08 1.477e-08
15-150 5.540e-08 2.915e-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: 2.16558 ( -0.1597 0.167703 )
Norm@50keV : 3.03887E-03 ( -0.000344944 0.000339268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.14 using 59 PHA bins.
# Reduced chi-squared = 0.8095 for 57 degrees of freedom
# Null hypothesis probability = 8.475839e-01
Photon flux (15-150 keV) in 12.05 sec: 0.494167 ( -0.0402201 0.0402268 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42715e-07 ( -3.37277e-08 3.44272e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63896 ( -0.767832 0.422606 )
Epeak [keV] : 26.7045 ( )
Norm@50keV : 6.30544E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.15 using 59 PHA bins.
# Reduced chi-squared = 0.7885 for 56 degrees of freedom
# Null hypothesis probability = 8.739818e-01
Photon flux (15-150 keV) in 12.05 sec: 0.483714 ( -0.04196 0.041551 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22499e-07 ( -3.93348e-08 4.15592e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63996 ( 1.71233 0.388436 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 26.7124 ( -10.8003 13.2145 )
Norm@50keV : 6.29149E-03 ( -0.002856 0.0121732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.15 using 59 PHA bins.
# Reduced chi-squared = 0.8028 for 55 degrees of freedom
# Null hypothesis probability = 8.523135e-01
Photon flux (15-150 keV) in 12.05 sec: 0.485282 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31482e-07 ( -3.31398e-07 -3.56764e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.29e-07
S(50-100 keV) = 1.15e-07
T90 vs. Hardness ratio plot
T90 = 17.7359999418259 sec.
Hardness ratio (energy fluence ratio) = 0.891473
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.865019
Count Ratio (50-100 keV) / (15-25 keV) = 0.397582
Mask shadow pattern
IMX = -4.427365595017845E-01, IMY = 4.193319806749431E-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:
-371.523400 -324.792700
-239.824000 -1.172000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
358.3073 -7.8609 3.0 25.8 120.3 0.9429 3.8 482.4 UNKNOWN
5.9271 33.9219 3.0 54.4 173.0 3.2434 3.9 ------ UNKNOWN
36.5532 -72.8597 2.6 55.4 5.2 3.9489 4.4 ------ UNKNOWN
40.3658 -58.4445 2.9 42.4 -3.6 1.1347 4.0 ------ UNKNOWN
36.0347 -51.2220 3.0 34.8 -4.6 0.8715 3.8 ------ UNKNOWN
55.5336 -56.5210 2.4 45.7 -14.7 1.5182 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.172000 10.876600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
20.7048 5.8473 0.6 24.0 -174.6 0.6624 18.6 ------ UNKNOWN
69.4656 -40.4824 2.2 45.9 -40.5 0.3933 5.2 ------ UNKNOWN
47.3802 28.6389 2.8 52.5 -142.3 0.6665 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
58.076600 894.676600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
346.6945 -5.2013 3.0 35.7 92.6 3.6385 3.9 ------ UNKNOWN
33.4360 -19.3554 3.0 28.1 -6.2 1.5051 3.8 ------ UNKNOWN
56.5132 -34.9183 2.7 52.9 -17.0 3.9201 4.2 ------ UNKNOWN
Plot creation:
Sun May 31 00:02:40 EDT 2015