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
72.7387 28.4286 0.0041 24.1119 -177.4841 2.7492266 46.997 TRIG_00176702
Foreground time interval of the image:
-1.564 26.588 (delta_t = 28.152 [sec])
Background time interval of the image:
-299.720 -20.391 (delta_t = 279.329 [sec])
-19.720 -1.564 (delta_t = 18.156 [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 0.512000
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 0.512000
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 0.512000
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 -1.564 sec. to 26.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63491 ( -0.0737026 0.0741497 )
Norm@50keV : 5.72016E-03 ( -0.00022302 0.000222264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6557 for 57 degrees of freedom
# Null hypothesis probability = 9.793692e-01
Photon flux (15-150 keV) in 28.15 sec: 0.743239 ( -0.0302871 0.0304202 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49991e-06 ( -6.19705e-08 6.22861e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.564 sec. to 26.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63212 ( -0.284438 0.0754679 )
Epeak [keV] : 8937.25 ( -8564.96 -8564.97 )
Norm@50keV : 5.73444E-03 ( -0.000221458 0.00207492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6674 for 56 degrees of freedom
# Null hypothesis probability = 9.738040e-01
Photon flux (15-150 keV) in 28.15 sec: 0.742859 ( -0.033379 0.030163 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50002e-06 ( -6.92884e-08 6.17358e-08 ) ergs/cm2
Band function
Time interval is from -1.564 sec. to 26.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34140 ( 1.34243 1.34243 )
beta : -1.63489 ( -0.074196 0.0736843 )
Epeak [keV] : 29.6407 ( -29.0227 -29.0227 )
Norm@50keV : 1.13380E-02 ( -0.00412701 0.796298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6795 for 55 degrees of freedom
# Null hypothesis probability = 9.669804e-01
Photon flux (15-150 keV) in 28.15 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] : 14.9417 ( )
R^2/D10^2 : 7.89636E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 214.01 using 59 PHA bins.
# Reduced chi-squared = 3.7545 for 57 degrees of freedom
# Null hypothesis probability = 5.077556e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.040e-07 8.895e-09
25- 50 4.116e-07 2.083e-08
50-150 6.243e-07 4.940e-08
15-150 1.140e-06 5.377e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 177.308 (-34.1914 -176.835)
Norm : 2.98441 (-0.129941 0.142928)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.86 using 59 PHA bins.
# Reduced chi-squared = 0.7343 for 57 degrees of freedom
# Null hypothesis probability = 9.337074e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.122e-07 1.264e-08
25- 50 4.024e-07 3.786e-08
50-150 8.475e-07 2.562e-07
15-150 1.462e-06 2.795e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.89632 (-0.785588 0.896319)
R1^2/D10^2 : 1.52237 (-0.631353 1.19819)
kT2 [keV] : 23.8313 (-2.45484 3.29474)
R2^2/D10^2 : 1.25707E-02 (-0.00475249 0.00627514)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.09 using 59 PHA bins.
# Reduced chi-squared = 0.7834 for 55 degrees of freedom
# Null hypothesis probability = 8.779801e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.288e-07 3.775e-08
25- 50 3.832e-07 3.659e-08
50-150 8.541e-07 8.361e-08
15-150 1.466e-06 1.189e-07
Peak spectrum fit
Power-law model
Time interval is from 1.220 sec. to 2.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33251 ( -0.125005 0.124822 )
Norm@50keV : 1.61510E-02 ( -0.0012591 0.00125779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.17 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.294174e-01
Photon flux (15-150 keV) in 1 sec: 1.93887 ( -0.15237 0.152531 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58373e-07 ( -1.36467e-08 1.37389e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.220 sec. to 2.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.256595 ( -0.635663 0.553007 )
Epeak [keV] : 81.9978 ( -14.4884 34.6959 )
Norm@50keV : 5.56859E-02 ( -0.0256913 0.0573807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 56 degrees of freedom
# Null hypothesis probability = 4.461748e-01
Photon flux (15-150 keV) in 1 sec: 1.86543 ( -0.15695 0.15706 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47316e-07 ( -1.475e-08 1.4921e-08 ) ergs/cm2
Band function
Time interval is from 1.220 sec. to 2.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.256534 ( -0.418822 0.654737 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 81.9835 ( -11.1689 34.6902 )
Norm@50keV : 5.56926E-02 ( -0.0257026 0.0574411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.089063e-01
Photon flux (15-150 keV) in 1 sec: 1.87558 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48841e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.3135 (-1.43495 1.60323)
R^2/D10^2 : 0.176611 (-0.0487622 0.0658746)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.56 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 57 degrees of freedom
# Null hypothesis probability = 8.019300e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.675e-09 1.434e-09
25- 50 4.139e-08 4.405e-09
50-150 7.754e-08 1.152e-08
15-150 1.286e-07 1.255e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.04208 (-0.622829 0.622801)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.19 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.781542e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.002e-08 1.805e-09
25- 50 3.852e-08 5.970e-09
50-150 8.448e-08 3.160e-08
15-150 1.430e-07 3.380e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.96189 (-2.31813 2.98983)
R1^2/D10^2 : 0.958980 (-0.542639 1.7196)
kT2 [keV] : 23.6115 (-4.4875 9.98132)
R2^2/D10^2 : 3.87424E-02 (-0.0290931 0.0507752)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.98 using 59 PHA bins.
# Reduced chi-squared = 0.9996 for 55 degrees of freedom
# Null hypothesis probability = 4.753703e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.482e-08 7.329e-09
25- 50 4.028e-08 1.697e-08
50-150 9.338e-08 4.738e-08
15-150 1.485e-07 6.137e-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: 1.63491 ( -0.0737026 0.0741497 )
Norm@50keV : 5.72016E-03 ( -0.00022302 0.000222264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6557 for 57 degrees of freedom
# Null hypothesis probability = 9.793692e-01
Photon flux (15-150 keV) in 28.15 sec: 0.743239 ( -0.0302871 0.0304202 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49991e-06 ( -6.19705e-08 6.22861e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63212 ( -0.284438 0.0754679 )
Epeak [keV] : 8937.25 ( -8564.96 -8564.97 )
Norm@50keV : 5.73444E-03 ( -0.000221458 0.00207492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6674 for 56 degrees of freedom
# Null hypothesis probability = 9.738040e-01
Photon flux (15-150 keV) in 28.15 sec: 0.742859 ( -0.033379 0.030163 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50002e-06 ( -6.92884e-08 6.17358e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34140 ( 1.34243 1.34243 )
beta : -1.63489 ( -0.074196 0.0736843 )
Epeak [keV] : 29.6407 ( -29.0227 -29.0227 )
Norm@50keV : 1.13380E-02 ( -0.00412701 0.796298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.37 using 59 PHA bins.
# Reduced chi-squared = 0.6795 for 55 degrees of freedom
# Null hypothesis probability = 9.669804e-01
Photon flux (15-150 keV) in 28.15 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) = 3.95e-07
S(50-100 keV) = 5.09e-07
T90 vs. Hardness ratio plot
T90 = 21.33599999547 sec.
Hardness ratio (energy fluence ratio) = 1.28861
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.1547
Count Ratio (50-100 keV) / (15-25 keV) = 0.85831
Mask shadow pattern
IMX = -4.471397921066536E-01, IMY = 1.964669167818170E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-299.720000 -20.391000
-19.720000 -1.564000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6286 22.0164 0.2 18.4 153.7 13.0136 58.4 0.3 Crab
110.0523 -4.9716 2.6 39.0 80.4 3.4005 4.5 ------ UNKNOWN
48.7583 8.1977 3.3 53.6 170.4 2.9568 3.5 ------ UNKNOWN
147.4127 32.8567 2.6 39.2 -7.3 1.3145 4.5 ------ UNKNOWN
130.2696 68.3913 3.2 39.3 -67.3 2.1264 3.6 ------ UNKNOWN
167.6182 57.5601 3.1 50.7 -44.4 5.2345 3.7 ------ UNKNOWN
48.3630 62.2864 2.8 43.8 -116.1 4.4785 4.2 ------ UNKNOWN
66.9471 69.8570 2.2 41.3 -100.8 5.8575 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.564000 26.588000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.4930 22.1230 4.1 18.4 154.2 -0.1618 -2.8 10.2 Crab
141.5631 2.6136 1.9 49.0 35.2 1.6786 6.1 ------ UNKNOWN
107.0108 14.7827 2.0 19.1 75.9 0.3680 5.8 ------ UNKNOWN
138.0651 22.5823 2.4 34.7 13.4 0.3613 4.8 ------ UNKNOWN
72.7387 28.4286 0.2 24.1 -177.5 2.7493 47.0 ------ UNKNOWN
107.4211 38.2186 2.3 7.8 -38.8 0.2549 5.0 ------ UNKNOWN
98.0203 41.1371 3.0 8.4 -96.3 0.2021 3.9 ------ UNKNOWN
59.6586 67.5792 2.3 41.8 -106.0 1.1995 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
117.980600 302.362400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
127.9704 1.8201 2.9 35.0 58.4 1.0373 4.0 ------ UNKNOWN
184.9147 -2.4513 2.5 49.7 -29.8 1.5411 4.6 ------ UNKNOWN
Plot creation:
Sun May 31 14:41:26 EDT 2015