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
6.3598 24.2982 0.0118 32.8514 79.6592 0.5569137 16.245 TRIG_00614094
Foreground time interval of the image:
-0.096 0.860 (delta_t = 0.956 [sec])
Background time interval of the image:
-51.923 -0.096 (delta_t = 51.827 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -0.096 sec. to 0.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.639381 ( -0.194205 0.184266 )
Norm@50keV : 3.53475E-02 ( -0.0038807 0.0037893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.973473e-01
Photon flux (15-150 keV) in 0.956 sec: 4.10866 ( -0.414106 0.415439 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24137e-07 ( -4.42364e-08 4.44135e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.096 sec. to 0.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.630588 ( -0.390082 0.273703 )
Epeak [keV] : 9999.24 ( )
Norm@50keV : 3.56290E-02 ( -0.003574 0.0151071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.89 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 56 degrees of freedom
# Null hypothesis probability = 1.717859e-01
Photon flux (15-150 keV) in 0.956 sec: 4.11306 ( -0.41706 0.40999 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23925e-07 ( -2.25415e-08 4.48278e-08 ) ergs/cm2
Band function
Time interval is from -0.096 sec. to 0.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.675557 ( 0.675557 0.675557 )
beta : -0.639382 ( -0.184339 0.194446 )
Epeak [keV] : 19.5228 ( -19.5228 -19.5228 )
Norm@50keV : 4.93267E-02 ( -0.0178808 0.0859704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 55 degrees of freedom
# Null hypothesis probability = 1.501168e-01
Photon flux (15-150 keV) in 0.956 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] : 31.6899 (-4.8665 6.62378)
R^2/D10^2 : 5.45522E-02 (-0.0217603 0.0325887)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.41 using 59 PHA bins.
# Reduced chi-squared = 1.498 for 57 degrees of freedom
# Null hypothesis probability = 8.780467e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.917e-09 1.732e-09
25- 50 4.991e-08 9.484e-09
50-150 3.459e-07 5.526e-08
15-150 4.037e-07 5.454e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 15.4165 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.14 using 59 PHA bins.
# Reduced chi-squared = 2.3008 for 57 degrees of freedom
# Null hypothesis probability = 8.959432e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.670e-08 2.034e-08
25- 50 7.060e-08 3.899e-08
50-150 1.548e-07 8.489e-08
15-150 2.621e-07 1.443e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.85054 (-3.62766 5.3678)
R1^2/D10^2 : 1.19139 (-0.878226 6.01175)
kT2 [keV] : 54.8859 (-17.8892 -54.9033)
R2^2/D10^2 : 1.19146E-02 (-0.00837403 0.0134352)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 55 degrees of freedom
# Null hypothesis probability = 1.602505e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.070e-08 1.129e-08
25- 50 6.131e-08 3.173e-08
50-150 3.549e-07 1.879e-07
15-150 4.369e-07 2.111e-07
Peak spectrum fit
Power-law model
Time interval is from -0.118 sec. to 0.882 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.646562 ( -0.192285 0.182602 )
Norm@50keV : 3.43916E-02 ( -0.00374357 0.00365814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.90 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.735618e-01
Photon flux (15-150 keV) in 1 sec: 3.99457 ( -0.400347 0.401679 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.30217e-07 ( -4.45846e-08 4.47637e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.118 sec. to 0.882 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.637872 ( -0.392395 0.272107 )
Epeak [keV] : 9999.23 ( )
Norm@50keV : 3.46648E-02 ( -0.00345359 0.0150342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.95 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 56 degrees of freedom
# Null hypothesis probability = 1.501695e-01
Photon flux (15-150 keV) in 1 sec: 3.99654 ( -0.40126 0.39847 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.28837e-07 ( -4.3334e-08 4.5745e-08 ) ergs/cm2
Band function
Time interval is from -0.118 sec. to 0.882 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.667154 ( 0.667126 0.667126 )
beta : -0.646563 ( -0.182439 0.192752 )
Epeak [keV] : 19.5408 ( -19.541 -19.541 )
Norm@50keV : 4.80794E-02 ( -0.0172761 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.90 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 55 degrees of freedom
# Null hypothesis probability = 1.304048e-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] : 31.4276 (-4.79801 6.49034)
R^2/D10^2 : 5.41556E-02 (-0.0215325 0.0322493)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.76 using 59 PHA bins.
# Reduced chi-squared = 1.522 for 57 degrees of freedom
# Null hypothesis probability = 6.730278e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.129e-09 1.837e-09
25- 50 5.108e-08 9.960e-09
50-150 3.495e-07 5.790e-08
15-150 4.087e-07 6.155e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 15.0351 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 132.32 using 59 PHA bins.
# Reduced chi-squared = 2.3214 for 57 degrees of freedom
# Null hypothesis probability = 6.323545e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.744e-08 2.060e-08
25- 50 7.202e-08 3.984e-08
50-150 1.580e-07 8.670e-08
15-150 2.674e-07 1.459e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.31911 (-3.70733 3.91314)
R1^2/D10^2 : 1.00422 (-0.7129 2.56095)
kT2 [keV] : 57.0597 (-19.483 -57.0597)
R2^2/D10^2 : 1.04265E-02 (-0.00710736 0.0202936)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.35 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.404824e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.061e-08 1.149e-08
25- 50 6.353e-08 3.243e-08
50-150 3.583e-07 1.851e-07
15-150 4.424e-07 2.258e-07
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: 0.639381 ( -0.194205 0.184266 )
Norm@50keV : 3.53475E-02 ( -0.0038807 0.0037893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.973473e-01
Photon flux (15-150 keV) in 0.956 sec: 4.10866 ( -0.414106 0.415439 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24137e-07 ( -4.42364e-08 4.44135e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.630588 ( -0.390082 0.273703 )
Epeak [keV] : 9999.24 ( )
Norm@50keV : 3.56290E-02 ( -0.003574 0.0151071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.89 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 56 degrees of freedom
# Null hypothesis probability = 1.717859e-01
Photon flux (15-150 keV) in 0.956 sec: 4.11306 ( -0.41706 0.40999 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23925e-07 ( -2.25415e-08 4.48278e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.675557 ( 0.675557 0.675557 )
beta : -0.639382 ( -0.184339 0.194446 )
Epeak [keV] : 19.5228 ( -19.5228 -19.5228 )
Norm@50keV : 4.93267E-02 ( -0.0178808 0.0859704 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 55 degrees of freedom
# Null hypothesis probability = 1.501168e-01
Photon flux (15-150 keV) in 0.956 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) = 6.07e-08
S(50-100 keV) = 1.56e-07
T90 vs. Hardness ratio plot
T90 = 0.843999922275543 sec.
Hardness ratio (energy fluence ratio) = 2.57002
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.25545
Count Ratio (50-100 keV) / (15-25 keV) = 3.12153
Mask shadow pattern
IMX = 1.159099617728122E-01, IMY = -6.352373500335559E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-51.923400 -0.096000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5856 35.1762 6.0 36.1 -162.7 0.1877 1.9 1.5 Cyg X-1
308.0628 41.0337 2.6 27.2 -162.5 0.3567 4.5 5.3 Cyg X-3
326.1978 38.1520 4.4 19.4 166.7 0.1956 2.6 10.3 Cyg X-2
49.5099 39.3701 2.6 45.3 18.2 0.7007 4.4 ------ UNKNOWN
25.1107 60.8612 3.1 23.2 -8.4 0.2852 3.7 ------ UNKNOWN
350.4196 59.7250 2.2 7.7 -39.4 0.3611 5.2 ------ UNKNOWN
282.2406 17.6888 2.4 59.4 -163.1 2.3852 4.8 ------ UNKNOWN
67.9590 76.8900 2.6 37.7 -40.2 0.4831 4.5 ------ UNKNOWN
103.9517 65.3455 2.8 53.2 -34.8 1.2651 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.096000 0.860000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5005 35.3363 16.4 36.0 -162.4 -0.0127 -0.7 9.2 Cyg X-1
308.2167 40.8282 7.5 27.2 -163.0 -0.0232 -1.6 8.9 Cyg X-3
326.1779 38.3223 452.4 19.2 167.0 0.0004 0.0 0.3 Cyg X-2
6.3598 24.2982 0.7 32.9 79.7 0.5571 16.3 ------ UNKNOWN
322.3141 28.2078 2.4 29.6 160.8 0.0810 4.8 ------ UNKNOWN
65.3955 52.0428 2.0 46.6 -5.2 0.1447 5.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
20.276610 126.676590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.7149 35.1266 7.5 36.5 -161.7 0.2057 1.5 7.6 Cyg X-1
308.1157 40.9941 2.8 27.6 -161.2 0.4789 4.1 2.5 Cyg X-3
326.1961 38.1982 11.5 19.5 169.0 0.1110 1.0 7.5 Cyg X-2
59.2341 50.3799 2.2 44.0 -0.0 1.0694 5.1 ------ UNKNOWN
73.2979 44.7714 3.0 54.9 -1.7 1.5650 3.9 ------ UNKNOWN
Plot creation:
Thu May 28 14:18:14 EDT 2015