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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
356.7830 0.3123 0.0079 20.4484 63.9740 1.9488337 24.335 TRIG_00319584
Foreground time interval of the image:
-20.496 12.005 (delta_t = 32.501 [sec])
Background time interval of the image:
-239.296 -20.496 (delta_t = 218.800 [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 -20.496 sec. to 106.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27000 ( -0.0650173 0.0647763 )
Norm@50keV : 3.66994E-03 ( -0.000115863 0.000115819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.17 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.286188e-01
Photon flux (15-150 keV) in 127 sec: 0.435506 ( -0.0148354 0.0149195 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64039e-06 ( -1.60269e-07 1.6121e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.496 sec. to 106.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26767 ( -0.0669461 0.063753 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.68553E-03 ( -0.000115867 0.000433609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.892682e-01
Photon flux (15-150 keV) in 127 sec: 0.435274 ( -0.014851 0.014889 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64438e-06 ( -1.64465e-07 1.54991e-07 ) ergs/cm2
Band function
Time interval is from -20.496 sec. to 106.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01638 ( 1.01638 1.01638 )
beta : -1.26998 ( -0.0647762 0.0650225 )
Epeak [keV] : 43.6675 ( -43.6672 -43.6672 )
Norm@50keV : 6.90241E-03 ( -0.00242434 0.507637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.17 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 55 degrees of freedom
# Null hypothesis probability = 2.640658e-01
Photon flux (15-150 keV) in 127 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] : 19.6198 ( )
R^2/D10^2 : 1.97575E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 344.05 using 59 PHA bins.
# Reduced chi-squared = 6.0359 for 57 degrees of freedom
# Null hypothesis probability = 1.220643e-42
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.876e-07 1.372e-08
25- 50 9.225e-07 4.267e-08
50-150 2.625e-06 1.619e-07
15-150 3.735e-06 1.441e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.82794 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 138.68 using 59 PHA bins.
# Reduced chi-squared = 2.4330 for 57 degrees of freedom
# Null hypothesis probability = 9.280687e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.781e-07 2.000e-08
25- 50 1.112e-06 3.912e-08
50-150 2.439e-06 8.255e-08
15-150 4.129e-06 1.530e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.62984 (-0.795795 0.87172)
R1^2/D10^2 : 0.331093 (-0.102794 0.16061)
kT2 [keV] : 39.2062 (-5.1509 7.53719)
R2^2/D10^2 : 1.96423E-03 (-0.000755677 0.00101565)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.62 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.143958e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.765e-07 5.061e-08
25- 50 1.026e-06 7.436e-08
50-150 3.327e-06 3.283e-07
15-150 4.830e-06 3.778e-07
Peak spectrum fit
Power-law model
Time interval is from 24.680 sec. to 25.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23648 ( -0.170409 0.169763 )
Norm@50keV : 1.67943E-02 ( -0.00151453 0.00151155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.02 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.669285e-01
Photon flux (15-150 keV) in 1 sec: 1.98203 ( -0.179256 0.17951 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68682e-07 ( -1.77832e-08 1.79874e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.680 sec. to 25.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23933 ( -0.177769 0.164507 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.68179E-02 ( -0.0168616 0.00736297 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.05 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 56 degrees of freedom
# Null hypothesis probability = 3.312949e-01
Photon flux (15-150 keV) in 1 sec: 1.98339 ( -0.18084 0.17777 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67534e-07 ( -1.6681e-08 1.8943e-08 ) ergs/cm2
Band function
Time interval is from 24.680 sec. to 25.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.950783 ( 0.950779 0.950779 )
beta : -1.23683 ( 1.23684 0.170873 )
Epeak [keV] : 63.6374 ( -63.6374 -63.6374 )
Norm@50keV : 3.02630E-02 ( -0.0149719 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.02 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 2.989158e-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] : 18.5893 (-2.63044 3.16407)
R^2/D10^2 : 0.110739 (-0.0436076 0.0713307)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.49 using 59 PHA bins.
# Reduced chi-squared = 1.7630 for 57 degrees of freedom
# Null hypothesis probability = 3.349014e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.580e-09 1.425e-09
25- 50 3.589e-08 4.605e-09
50-150 9.074e-08 1.588e-08
15-150 1.342e-07 1.860e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.06054 (-0.73215 0.732125)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.23 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.737881e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.007e-08 4.365e-09
25- 50 3.861e-08 2.086e-08
50-150 8.467e-08 4.419e-08
15-150 1.433e-07 4.576e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.46063 (-1.90075 2.44866)
R1^2/D10^2 : 2.53460 (-1.67446 5.06835)
kT2 [keV] : 33.7696 (-8.37108 19.8441)
R2^2/D10^2 : 1.48782E-02 (-0.0107227 0.0122049)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.85 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.040828e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.798e-08 7.885e-09
25- 50 3.399e-08 1.262e-08
50-150 1.233e-07 5.186e-08
15-150 1.752e-07 6.205e-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: 0.903458 ( -0.129539 0.125752 )
Norm@50keV : 3.84541E-03 ( -0.000246547 0.000244159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.14 using 59 PHA bins.
# Reduced chi-squared = 1.459 for 57 degrees of freedom
# Null hypothesis probability = 1.351583e-02
Photon flux (15-150 keV) in 32.5 sec: 0.441384 ( -0.02826 0.0283926 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40071e-06 ( -9.34651e-08 9.37931e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.897984 ( -0.148851 0.111168 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 3.87047E-03 ( -0.000247356 0.000233656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.35 using 59 PHA bins.
# Reduced chi-squared = 1.488 for 56 degrees of freedom
# Null hypothesis probability = 1.031616e-02
Photon flux (15-150 keV) in 32.5 sec: 0.441201 ( -0.028315 0.028323 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40456e-06 ( -9.75325e-08 8.89233e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.99995 ( 9.99995 9.99995 )
beta : -0.903452 ( -0.125785 0.129491 )
Epeak [keV] : 14.7583 ( -14.7583 -14.7583 )
Norm@50keV : 0.522645 ( -0.0335088 0.0331853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.14 using 59 PHA bins.
# Reduced chi-squared = 1.512 for 55 degrees of freedom
# Null hypothesis probability = 8.459046e-03
Photon flux (15-150 keV) in 32.5 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) = 1.02e-06
S(50-100 keV) = 1.68e-06
T90 vs. Hardness ratio plot
T90 = 107.668000012636 sec.
Hardness ratio (energy fluence ratio) = 1.64706
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.3256
Count Ratio (50-100 keV) / (15-25 keV) = 1.1672
Mask shadow pattern
IMX = 1.636026670224270E-01, IMY = -3.350496201258050E-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:
-239.296000 -20.496000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0956 40.9530 7.6 49.6 177.2 0.7097 1.5 0.7 Cyg X-3
326.1064 38.2214 4.2 35.5 178.3 0.6165 2.7 6.8 Cyg X-2
298.3003 41.6244 2.7 57.0 177.3 4.9412 4.3 ------ UNKNOWN
299.7602 56.0420 3.2 57.7 -165.5 3.1562 3.6 ------ UNKNOWN
40.0868 37.7223 2.6 37.6 -76.1 2.2549 4.5 ------ UNKNOWN
47.4341 33.8875 2.7 42.7 -68.4 3.8220 4.3 ------ UNKNOWN
35.6286 51.6138 4.5 41.1 -98.0 2.6470 2.7 ------ UNKNOWN
35.5568 51.9695 5.3 41.3 -98.5 2.5599 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-20.496000 12.004600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0741 41.0581 7.4 49.6 177.4 0.2529 1.6 6.5 Cyg X-3
326.2455 38.3776 3.6 35.5 178.7 0.2829 3.2 4.8 Cyg X-2
356.7830 0.3122 0.5 20.4 64.0 1.9491 24.3 193.9 UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
64.004600 482.834000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.1689 38.3152 100.2 47.3 172.6 0.4311 0.1 0.4 Cyg X-2
319.9531 24.1376 2.3 42.9 152.1 17.9640 5.1 ------ UNKNOWN
0.1368 -31.7760 2.6 32.2 20.2 7.6153 4.4 ------ UNKNOWN
353.8194 -21.6099 3.0 22.1 32.9 5.7089 3.9 ------ UNKNOWN
340.1769 54.5879 2.9 56.0 -166.0 20.8807 4.0 ------ UNKNOWN
35.4886 15.1323 3.0 41.0 -87.5 21.4450 3.9 ------ UNKNOWN
Plot creation:
Sun May 31 06:39:39 EDT 2015