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
11.3161 41.8559 0.0184 21.9008 -103.8776 0.4924719 10.524 TRIG_00633105
Foreground time interval of the image:
-0.596 14.940 (delta_t = 15.536 [sec])
Background time interval of the image:
-239.392 -0.596 (delta_t = 238.796 [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 4.096000
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 4.096000
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 4.096000
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 -0.596 sec. to 14.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96269 ( -0.236262 0.252464 )
Norm@50keV : 1.83862E-03 ( -0.000337573 0.000332145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.85 using 59 PHA bins.
# Reduced chi-squared = 1.419 for 57 degrees of freedom
# Null hypothesis probability = 2.056080e-02
Photon flux (15-150 keV) in 15.54 sec: 0.271165 ( -0.0389326 0.0389354 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63013e-07 ( -4.56275e-08 4.72581e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.596 sec. to 14.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.893459 ( -2.15487 1.55838 )
Epeak [keV] : 38.0901 ( -5.17062 7.0252 )
Norm@50keV : 0.101874 ( -0.112724 2.25803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.40 using 59 PHA bins.
# Reduced chi-squared = 1.221 for 56 degrees of freedom
# Null hypothesis probability = 1.236737e-01
Photon flux (15-150 keV) in 15.54 sec: 0.257187 ( -0.037999 0.038297 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14413e-07 ( -3.65516e-08 4.22626e-08 ) ergs/cm2
Band function
Time interval is from -0.596 sec. to 14.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.14653 ( -2.15237 -1.43592 )
beta : -9.99649 ( 9.99649 19.9949 )
Epeak [keV] : 37.8436 ( -4.94776 7.25079 )
Norm@50keV : 0.147729 ( -0.0202652 2.27633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.40 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.057903e-01
Photon flux (15-150 keV) in 15.54 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] : 9.68645 (-1.20657 1.38511)
R^2/D10^2 : 0.156886 (-0.0635147 0.104165)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.71 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.376292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.605e-08 1.125e-08
25- 50 1.094e-07 2.131e-08
50-150 5.201e-08 1.874e-08
15-150 2.074e-07 3.908e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.2720 (-18.9188 34.22)
Norm : 1.45594 (-0.291875 0.353683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.72 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 57 degrees of freedom
# Null hypothesis probability = 5.768717e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.691e-08 1.126e-08
25- 50 8.673e-08 1.559e-08
50-150 9.905e-08 3.616e-08
15-150 2.427e-07 6.235e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.42842 (-6.42842 -6.42842)
R1^2/D10^2 : 0.210338 (-0.210338 -0.210338)
kT2 [keV] : 11.0771 (-11.0771 -11.0771)
R2^2/D10^2 : 7.27146E-02 (-0.0727146 0.179181)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.35 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 55 degrees of freedom
# Null hypothesis probability = 1.066751e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.870e-08 8.065e-08
25- 50 1.055e-07 1.937e-07
50-150 6.041e-08 4.216e-07
15-150 2.146e-07 8.500e-07
Peak spectrum fit
Power-law model
Time interval is from 1.324 sec. to 2.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46191 ( -0.379459 0.383754 )
Norm@50keV : 5.09848E-03 ( -0.00126602 0.00125511 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.09 using 59 PHA bins.
# Reduced chi-squared = 0.8437 for 57 degrees of freedom
# Null hypothesis probability = 7.936336e-01
Photon flux (15-150 keV) in 1 sec: 0.630183 ( -0.153319 0.153653 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86841e-08 ( -1.29536e-08 1.32642e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.324 sec. to 2.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.262598 ( -3.30844 1.80025 )
Epeak [keV] : 61.0838 ( -17.5835 -61.0836 )
Norm@50keV : 4.23545E-02 ( -0.0423554 2.42891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.49 using 59 PHA bins.
# Reduced chi-squared = 0.8123 for 56 degrees of freedom
# Null hypothesis probability = 8.410853e-01
Photon flux (15-150 keV) in 1 sec: 0.600714 ( -0.158291 0.157866 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.28979e-08 ( -1.32296e-08 1.46998e-08 ) ergs/cm2
Band function
Time interval is from 1.324 sec. to 2.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.05722 ( -3.53208 3.93533 )
beta : -2.48105 ( 2.47671 1.12562 )
Epeak [keV] : 52.0177 ( -29.5717 74.9247 )
Norm@50keV : 0.127816 ( -0.117174 31.7023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.17 using 59 PHA bins.
# Reduced chi-squared = 0.8213 for 55 degrees of freedom
# Null hypothesis probability = 8.250546e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.42218e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.9380 (-3.07498 4.31663)
R^2/D10^2 : 0.100010 (-0.0623501 0.14312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.14 using 59 PHA bins.
# Reduced chi-squared = 0.8095 for 57 degrees of freedom
# Null hypothesis probability = 8.476374e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.106e-09 1.947e-09
25- 50 1.520e-08 6.988e-09
50-150 1.940e-08 1.022e-08
15-150 3.871e-08 1.623e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.330 (-120.377 -199.351)
Norm : 2.61820 (-0.624417 0.625648)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.28 using 59 PHA bins.
# Reduced chi-squared = 0.8295 for 57 degrees of freedom
# Null hypothesis probability = 8.170723e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.520e-09 3.945e-09
25- 50 1.254e-08 7.410e-09
50-150 2.750e-08 1.611e-08
15-150 4.657e-08 2.742e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.2363 (-11.2208 3.04837)
R1^2/D10^2 : 0.169837 (-0.170096 -0.170096)
kT2 [keV] : 34.5587 (-34.3969 -34.3969)
R2^2/D10^2 : 1.77935E-03 (-0.0018217 0.201668)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.14 using 59 PHA bins.
# Reduced chi-squared = 0.8208 for 55 degrees of freedom
# Null hypothesis probability = 8.258725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.801e-09 3.264e-09
25- 50 1.504e-08 1.048e-08
50-150 2.503e-08 1.784e-08
15-150 4.487e-08 2.911e-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: 1.96269 ( -0.236262 0.252464 )
Norm@50keV : 1.83862E-03 ( -0.000337573 0.000332145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.85 using 59 PHA bins.
# Reduced chi-squared = 1.419 for 57 degrees of freedom
# Null hypothesis probability = 2.056080e-02
Photon flux (15-150 keV) in 15.54 sec: 0.271165 ( -0.0389326 0.0389354 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63013e-07 ( -4.56275e-08 4.72581e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.893459 ( -2.15487 1.55838 )
Epeak [keV] : 38.0901 ( -5.17062 7.0252 )
Norm@50keV : 0.101874 ( -0.112724 2.25803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.40 using 59 PHA bins.
# Reduced chi-squared = 1.221 for 56 degrees of freedom
# Null hypothesis probability = 1.236737e-01
Photon flux (15-150 keV) in 15.54 sec: 0.257187 ( -0.037999 0.038297 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14413e-07 ( -3.65516e-08 4.22626e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.14653 ( -2.15237 -1.43592 )
beta : -9.99649 ( 9.99649 19.9949 )
Epeak [keV] : 37.8436 ( -4.94776 7.25079 )
Norm@50keV : 0.147729 ( -0.0202652 2.27633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.40 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.057903e-01
Photon flux (15-150 keV) in 15.54 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) = 7.83e-08
S(50-100 keV) = 8.03e-08
T90 vs. Hardness ratio plot
T90 = 13.9719999432564 sec.
Hardness ratio (energy fluence ratio) = 1.02554
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.0886
Count Ratio (50-100 keV) / (15-25 keV) = 0.37804
Mask shadow pattern
IMX = -9.642222847631825E-02, IMY = 3.902786785566854E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.392000 -0.596000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0886 40.9774 3.8 49.5 -32.1 1.4818 3.1 1.8 Cyg X-3
326.2901 38.1780 6.3 43.2 -49.8 1.0037 1.8 10.3 Cyg X-2
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.596000 14.940000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1508 40.8471 35.9 49.6 -32.3 -0.0362 -0.3 6.6 Cyg X-3
326.0370 38.2073 10.8 43.3 -49.6 0.1159 1.1 9.3 Cyg X-2
68.3765 77.1142 2.1 20.4 69.7 0.2519 5.5 ------ UNKNOWN
64.9275 15.0486 2.7 54.0 176.7 0.6258 4.3 ------ UNKNOWN
11.3161 41.8559 1.1 21.9 -103.9 0.4924 10.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
82.708590 702.175600
703.608000 720.308590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.6555 35.1293 10.0 54.9 -17.3 -1.4274 -1.1 5.4 Cyg X-1
308.2269 41.0640 10.9 46.2 -14.4 0.7017 1.1 8.5 Cyg X-3
326.0474 38.2078 6.9 34.5 -26.4 0.8609 1.7 9.0 Cyg X-2
54.0995 71.8876 2.8 36.4 75.2 3.9668 4.2 ------ UNKNOWN
316.8447 66.7219 3.3 38.4 23.1 1.9283 3.5 ------ UNKNOWN
334.7397 49.1921 2.7 26.4 -7.0 1.5875 4.2 ------ UNKNOWN
Plot creation:
Thu May 28 13:21:21 EDT 2015