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
22.7485 -34.0943 0.0019 11.3178 177.1952 6.6018555 98.409 TRIG_00337914
Foreground time interval of the image:
-1.328 9.773 (delta_t = 11.101 [sec])
Background time interval of the image:
-239.328 -1.328 (delta_t = 238.000 [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 0.256000
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 0.256000
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 0.256000
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 -1.328 sec. to 63.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41002 ( -0.038309 0.0382673 )
Norm@50keV : 8.33358E-03 ( -0.000165216 0.000165182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.99 using 59 PHA bins.
# Reduced chi-squared = 0.7718 for 57 degrees of freedom
# Null hypothesis probability = 8.964580e-01
Photon flux (15-150 keV) in 65 sec: 1.01720 ( -0.0228409 0.0229161 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22344e-06 ( -1.07171e-07 1.07372e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.328 sec. to 63.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19803 ( -0.157448 0.152203 )
Epeak [keV] : 217.876 ( -68.0971 366.114 )
Norm@50keV : 1.03043E-02 ( -0.00142233 0.00170758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.29 using 59 PHA bins.
# Reduced chi-squared = 0.6838 for 56 degrees of freedom
# Null hypothesis probability = 9.661298e-01
Photon flux (15-150 keV) in 65 sec: 0.999449 ( -0.025736 0.025861 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.15764e-06 ( -1.18215e-07 1.17852e-07 ) ergs/cm2
Band function
Time interval is from -1.328 sec. to 63.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19803 ( -0.707208 4.87327 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 217.843 ( -64.975 365.257 )
Norm@50keV : 1.03031E-02 ( -0.000827176 0.00170746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.29 using 59 PHA bins.
# Reduced chi-squared = 0.6962 for 55 degrees of freedom
# Null hypothesis probability = 9.577776e-01
Photon flux (15-150 keV) in 65 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] : 18.5023 ( )
R^2/D10^2 : 5.50644E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 496.39 using 59 PHA bins.
# Reduced chi-squared = 8.7086 for 57 degrees of freedom
# Null hypothesis probability = 2.284570e-71
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.431e-07 9.782e-09
25- 50 1.147e-06 3.348e-08
50-150 2.870e-06 1.001e-07
15-150 4.261e-06 9.490e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.26227 (-0.0844847 0.0844369)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 101.39 using 59 PHA bins.
# Reduced chi-squared = 1.7787 for 57 degrees of freedom
# Null hypothesis probability = 2.708069e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.901e-07 1.528e-08
25- 50 1.327e-06 2.925e-08
50-150 2.911e-06 6.793e-08
15-150 4.929e-06 1.040e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.54398 (-0.610389 0.656293)
R1^2/D10^2 : 0.721386 (-0.17811 0.25185)
kT2 [keV] : 28.7861 (-1.88746 2.3148)
R2^2/D10^2 : 1.01683E-02 (-0.00243717 0.00281904)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.15 using 59 PHA bins.
# Reduced chi-squared = 0.7301 for 55 degrees of freedom
# Null hypothesis probability = 9.335018e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.482e-07 4.118e-08
25- 50 1.258e-06 5.493e-08
50-150 3.321e-06 1.326e-07
15-150 5.127e-06 1.797e-07
Peak spectrum fit
Power-law model
Time interval is from 3.672 sec. to 4.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19660 ( -0.0531976 0.0531021 )
Norm@50keV : 6.49538E-02 ( -0.00193208 0.00193196 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.543199e-01
Photon flux (15-150 keV) in 1 sec: 7.62047 ( -0.235486 0.236003 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.59616e-07 ( -2.16097e-08 2.16569e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.672 sec. to 4.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.785548 ( -0.226475 0.21542 )
Epeak [keV] : 166.289 ( -39.5987 114.974 )
Norm@50keV : 9.96149E-02 ( -0.0195116 0.0255905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.49 using 59 PHA bins.
# Reduced chi-squared = 0.8301 for 56 degrees of freedom
# Null hypothesis probability = 8.137136e-01
Photon flux (15-150 keV) in 1 sec: 7.45941 ( -0.24868 0.24892 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.45244e-07 ( -2.3314e-08 2.3189e-08 ) ergs/cm2
Band function
Time interval is from 3.672 sec. to 4.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.785528 ( -0.114474 0.0934192 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 166.264 ( -22.2971 114.873 )
Norm@50keV : 9.96110E-02 ( -0.0183426 0.00580116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.49 using 59 PHA bins.
# Reduced chi-squared = 0.8452 for 55 degrees of freedom
# Null hypothesis probability = 7.862446e-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] : 19.4674 ( )
R^2/D10^2 : 0.383720 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 211.83 using 59 PHA bins.
# Reduced chi-squared = 3.7164 for 57 degrees of freedom
# Null hypothesis probability = 1.141623e-19
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.833e-08 1.735e-09
25- 50 1.386e-07 6.050e-09
50-150 3.877e-07 1.970e-08
15-150 5.546e-07 2.050e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 31.7181 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 176.29 using 59 PHA bins.
# Reduced chi-squared = 3.0929 for 57 degrees of freedom
# Null hypothesis probability = 4.094128e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.898e-08 2.500e-09
25- 50 1.519e-07 4.700e-09
50-150 3.332e-07 1.050e-08
15-150 5.641e-07 1.660e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.73465 (-1.05033 1.20295)
R1^2/D10^2 : 4.08019 (-1.44383 2.49736)
kT2 [keV] : 29.0905 (-2.7071 3.74601)
R2^2/D10^2 : 8.69135E-02 (-0.029949 0.0358364)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.71 using 59 PHA bins.
# Reduced chi-squared = 0.8492 for 55 degrees of freedom
# Null hypothesis probability = 7.793776e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.472e-08 7.230e-09
25- 50 1.423e-07 1.120e-08
50-150 4.483e-07 3.940e-08
15-150 6.454e-07 4.310e-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: 1.32845 ( -0.03053 0.0304667 )
Norm@50keV : 3.87655E-02 ( -0.000644702 0.000644235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.99 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.158058e-01
Photon flux (15-150 keV) in 11.1 sec: 4.64994 ( -0.0874159 0.0876473 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22336e-06 ( -7.0257e-08 7.02815e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01144 ( -0.128595 0.125098 )
Epeak [keV] : 187.884 ( -36.7553 79.8796 )
Norm@50keV : 5.25700E-02 ( -0.00581492 0.00670379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.62 using 59 PHA bins.
# Reduced chi-squared = 0.9039 for 56 degrees of freedom
# Null hypothesis probability = 6.779491e-01
Photon flux (15-150 keV) in 11.1 sec: 4.53664 ( -0.09612 0.09661 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.16529e-06 ( -7.45254e-08 7.43922e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01143 ( -0.113133 0.15535 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 187.856 ( -36.7365 79.8702 )
Norm@50keV : 5.25655E-02 ( -0.00581508 0.00670547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.62 using 59 PHA bins.
# Reduced chi-squared = 0.9204 for 55 degrees of freedom
# Null hypothesis probability = 6.424940e-01
Photon flux (15-150 keV) in 11.1 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) = 1.23e-06
S(50-100 keV) = 1.86e-06
T90 vs. Hardness ratio plot
T90 = 33 sec.
Hardness ratio (energy fluence ratio) = 1.5122
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.43035
Count Ratio (50-100 keV) / (15-25 keV) = 1.1821
Mask shadow pattern
IMX = -1.999025555549942E-01, IMY = -9.793488143692878E-03
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.328000 -1.328000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
56.0987 -33.1744 2.5 36.1 141.2 1.3390 4.6 ------ UNKNOWN
52.9960 -50.8219 2.7 38.8 170.3 1.0603 4.3 ------ UNKNOWN
358.6813 3.6627 2.0 32.7 -5.0 1.1304 5.7 233.6 UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.328000 9.772590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
29.8956 9.8769 2.1 37.1 51.4 0.8007 5.6 ------ UNKNOWN
22.7485 -34.0943 0.1 11.3 177.2 6.6018 98.4 ------ UNKNOWN
27.5840 -51.5693 2.5 28.5 -167.5 0.3344 4.7 ------ UNKNOWN
342.0148 -15.4260 2.5 32.9 -52.5 0.4273 4.6 ------ UNKNOWN
327.9618 -3.4163 1.9 50.6 -45.2 1.8695 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
41.172590 962.775200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
3.7709 -6.5825 2.7 32.6 -5.1 2.2596 4.3 454.9 UNKNOWN
351.9699 12.9890 2.8 55.5 -5.5 5.8376 4.2 ------ UNKNOWN
11.7039 -44.9014 2.3 13.7 -113.4 2.0909 5.0 ------ UNKNOWN
346.6504 -48.6096 2.9 30.3 -97.8 2.3700 4.0 ------ UNKNOWN
332.1966 -19.0877 4.0 47.1 -53.1 6.1514 2.9 ------ UNKNOWN
330.3708 -46.7781 5.2 41.0 -92.5 5.4521 2.2 ------ UNKNOWN
328.8770 -60.0872 2.6 43.1 -112.2 10.1298 4.5 ------ UNKNOWN
Plot creation:
Sun May 31 05:16:01 EDT 2015