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
344.4988 15.4522 0.0147 27.6869 -84.1181 1.0316665 13.150 TRIG_00590446
Foreground time interval of the image:
-1.124 22.764 (delta_t = 23.888 [sec])
Background time interval of the image:
-71.083 -1.124 (delta_t = 69.959 [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)
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 -1.124 sec. to 22.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44586 ( -0.18863 0.189966 )
Norm@50keV : 2.46282E-03 ( -0.000285215 0.000284238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.59 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 57 degrees of freedom
# Null hypothesis probability = 9.242037e-02
Photon flux (15-150 keV) in 23.89 sec: 0.303198 ( -0.0351771 0.0352388 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6346e-07 ( -7.10962e-08 7.18203e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.124 sec. to 22.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.301185 ( -1.10673 0.874225 )
Epeak [keV] : 75.0362 ( -16.2701 76.5671 )
Norm@50keV : 9.13492E-03 ( -0.00569968 0.0221184 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.33 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.625325e-01
Photon flux (15-150 keV) in 23.89 sec: 0.289068 ( -0.037133 0.036922 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.23031e-07 ( -7.65006e-08 7.82397e-08 ) ergs/cm2
Band function
Time interval is from -1.124 sec. to 22.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.289652 ( -0.81658 0.898789 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 75.6891 ( -14.6796 75.5659 )
Norm@50keV : 9.12547E-03 ( -0.00509386 0.154676 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.34 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.406526e-01
Photon flux (15-150 keV) in 23.89 sec: 0.291295 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22931e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.5067 (-1.8536 2.17459)
R^2/D10^2 : 3.21419E-02 (-0.0119289 0.0181869)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.32 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 57 degrees of freedom
# Null hypothesis probability = 8.308423e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.843e-08 8.123e-09
25- 50 1.573e-07 2.421e-08
50-150 2.612e-07 5.710e-08
15-150 4.570e-07 6.880e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.25493 (-0.14194 0.141933)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.02 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.153243e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.467e-08 4.192e-08
25- 50 1.436e-07 7.860e-08
50-150 3.150e-07 1.733e-07
15-150 5.333e-07 2.910e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.16108 (-2.13258 40.7875)
R1^2/D10^2 : 4.94091 (-4.89613 34445)
kT2 [keV] : 17.1452 (-2.48008 39.5887)
R2^2/D10^2 : 2.15160E-02 (-0.0213222 0.0197948)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.17 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 55 degrees of freedom
# Null hypothesis probability = 1.439374e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.102e-08 2.246e-08
25- 50 1.420e-07 3.779e-08
50-150 2.878e-07 8.262e-08
15-150 4.909e-07 1.074e-07
Peak spectrum fit
Power-law model
Time interval is from 0.180 sec. to 1.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49210 ( -0.269605 0.275046 )
Norm@50keV : 7.94052E-03 ( -0.00152389 0.0015131 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.64 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 57 degrees of freedom
# Null hypothesis probability = 1.389875e-01
Photon flux (15-150 keV) in 1 sec: 0.989200 ( -0.182583 0.18283 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.54133e-08 ( -1.54865e-08 1.58318e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.180 sec. to 1.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.17627 ( -2.51841 1.59224 )
Epeak [keV] : 51.1974 ( -10.1608 19.1375 )
Norm@50keV : 0.251432 ( -0.257254 8.18075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 56 degrees of freedom
# Null hypothesis probability = 3.885843e-01
Photon flux (15-150 keV) in 1 sec: 0.935159 ( -0.178697 0.182081 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14969e-08 ( -1.47289e-08 1.68052e-08 ) ergs/cm2
Band function
Time interval is from 0.180 sec. to 1.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.15582 ( -1.19973 1.01059 )
beta : -9.99999 ( 9.99999 1.34419e-05 )
Epeak [keV] : 51.4263 ( -8.97629 10.7985 )
Norm@50keV : 0.243266 ( -0.0420899 8.29844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.528221e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.86691e-08 ( -6.86621e-08 -1.54333e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8422 (-2.14234 2.66507)
R^2/D10^2 : 0.215320 (-0.106502 0.197912)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.78 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.100161e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.532e-09 2.588e-09
25- 50 2.560e-08 6.680e-09
50-150 2.650e-08 9.935e-09
15-150 5.963e-08 1.554e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 183.718 (-93.5698 -178.186)
Norm : 4.13399 (-0.764547 0.885819)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.931251e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.040e-08 5.875e-09
25- 50 1.981e-08 1.116e-08
50-150 4.225e-08 2.414e-08
15-150 7.246e-08 4.172e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.0606 ( )
R1^2/D10^2 : 0.343821 (-0.342753 -0.342753)
kT2 [keV] : 21.0116 (-21.7493 -21.7493)
R2^2/D10^2 : 1.63564E-02 (-0.0131559 0.351174)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.78 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.83 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 55 degrees of freedom
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.387430e-01
# Null hypothesis probability = 3.710932e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 1.44586 ( -0.18863 0.189966 )
Norm@50keV : 2.46282E-03 ( -0.000285215 0.000284238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.59 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 57 degrees of freedom
# Null hypothesis probability = 9.242037e-02
Photon flux (15-150 keV) in 23.89 sec: 0.303198 ( -0.0351771 0.0352388 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6346e-07 ( -7.10962e-08 7.18203e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.301185 ( -1.10673 0.874225 )
Epeak [keV] : 75.0362 ( -16.2701 76.5671 )
Norm@50keV : 9.13492E-03 ( -0.00569968 0.0221184 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.33 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.625325e-01
Photon flux (15-150 keV) in 23.89 sec: 0.289068 ( -0.037133 0.036922 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.23031e-07 ( -7.65006e-08 7.82397e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.289652 ( -0.81658 0.898789 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 75.6891 ( -14.6796 75.5659 )
Norm@50keV : 9.12547E-03 ( -0.00509387 0.154681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.34 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.406526e-01
Photon flux (15-150 keV) in 23.89 sec: 0.291295 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22931e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.36e-07
S(50-100 keV) = 1.99e-07
T90 vs. Hardness ratio plot
T90 = 20.3039999604225 sec.
Hardness ratio (energy fluence ratio) = 1.46324
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.63981
Count Ratio (50-100 keV) / (15-25 keV) = 1.19036
Mask shadow pattern
IMX = 5.377245253927346E-02, IMY = 5.219584705870727E-01
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:
-71.083400 -1.124000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5993 35.2076 1.8 47.3 -13.1 0.8792 6.3 0.6 Cyg X-1
308.0818 40.9766 2.0 39.1 -8.5 0.5964 5.7 1.9 Cyg X-3
326.2078 38.2859 7.6 26.2 -19.8 0.1238 1.5 2.7 Cyg X-2
57.7432 21.8669 3.3 51.7 154.2 1.4029 3.6 ------ UNKNOWN
333.1098 54.5968 3.5 23.5 20.9 0.2708 3.3 ------ UNKNOWN
292.5864 45.0099 2.2 48.7 1.8 0.8992 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.124000 22.764000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6969 35.3148 8.7 47.2 -13.0 -0.1251 -1.3 8.6 Cyg X-1
308.1107 41.0703 13.4 39.0 -8.4 -0.0609 -0.9 7.1 Cyg X-3
326.3348 38.2543 6.2 26.1 -19.9 -0.0972 -1.9 8.7 Cyg X-2
344.4988 15.4522 0.9 27.7 -84.1 1.0317 13.2 ------ UNKNOWN
11.3056 -2.5821 2.1 43.4 -134.4 0.6537 5.4 ------ UNKNOWN
323.8006 9.4264 2.1 44.1 -61.0 1.1995 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
708.016580 962.620200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6381 22.0255 0.3 30.8 -97.1 10.7544 34.6 0.7 Crab
133.4505 -16.7993 2.6 40.3 137.9 1.9672 4.4 ------ UNKNOWN
Plot creation:
Sat May 30 14:07:07 EDT 2015