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
322.1298 -6.0685 0.0154 15.7719 128.0141 1.2096779 12.563 TRIG_00213630
Foreground time interval of the image:
-67.164 18.112 (delta_t = 85.276 [sec])
Background time interval of the image:
-239.856 -67.164 (delta_t = 172.692 [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 3.072000
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 3.072000
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 3.072000
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 -67.164 sec. to 18.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52478 ( -0.189501 0.192707 )
Norm@50keV : 8.82766E-04 ( -0.000102599 0.000101482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.72 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 57 degrees of freedom
# Null hypothesis probability = 2.105907e-02
Photon flux (15-150 keV) in 85.28 sec: 0.110955 ( -0.0120725 0.0120787 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11367e-07 ( -9.06228e-08 9.22892e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -67.164 sec. to 18.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.875455 ( -0.964378 0.76796 )
Epeak [keV] : 79.4460 ( -25.2636 -79.4485 )
Norm@50keV : 1.97877E-03 ( -0.00114907 0.00456557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.79 using 59 PHA bins.
# Reduced chi-squared = 1.407 for 56 degrees of freedom
# Null hypothesis probability = 2.404245e-02
Photon flux (15-150 keV) in 85.28 sec: 0.107737 ( -0.0127012 0.012533 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63518e-07 ( -1.06006e-07 1.09008e-07 ) ergs/cm2
Band function
Time interval is from -67.164 sec. to 18.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.01186 ( -7.1312 -3.013 )
beta : -1.82733 ( -0.40402 0.303624 )
Epeak [keV] : 33.0581 ( -10.2321 40.8916 )
Norm@50keV : 1.03362 ( -1.03452 10.2849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.40 using 59 PHA bins.
# Reduced chi-squared = 1.389 for 55 degrees of freedom
# Null hypothesis probability = 2.971720e-02
Photon flux (15-150 keV) in 85.28 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75483e-07 ( -6.74886e-07 -9.81291e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1316 (-1.7033 2.0234)
R^2/D10^2 : 2.00411E-02 (-0.00798804 0.0128566)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.22 using 59 PHA bins.
# Reduced chi-squared = 1.600 for 57 degrees of freedom
# Null hypothesis probability = 2.688700e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.249e-08 1.280e-08
25- 50 2.176e-07 3.347e-08
50-150 2.386e-07 5.684e-08
15-150 5.187e-07 7.552e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 198.190 (-86.9023 -198.205)
Norm : 0.453220 (-0.0489185 0.0543089)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.33 using 59 PHA bins.
# Reduced chi-squared = 1.392 for 57 degrees of freedom
# Null hypothesis probability = 2.690943e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.632e-08 5.351e-08
25- 50 1.852e-07 1.007e-07
50-150 4.053e-07 2.193e-07
15-150 6.868e-07 3.729e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.86323 (-2.35234 2.93323)
R1^2/D10^2 : 8.15960E-02 (-0.0481157 0.153101)
kT2 [keV] : 26.5536 (-9.30286 79.4303)
R2^2/D10^2 : 1.14638E-03 (-0.00107785 0.00457671)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.30 using 59 PHA bins.
# Reduced chi-squared = 1.405 for 55 degrees of freedom
# Null hypothesis probability = 2.537258e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.838e-08 4.845e-08
25- 50 1.981e-07 9.594e-08
50-150 3.825e-07 2.159e-07
15-150 6.690e-07 3.471e-07
Peak spectrum fit
Power-law model
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.850847 ( -0.449549 0.404766 )
Norm@50keV : 4.13155E-03 ( -0.00100436 0.000973977 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.09 using 59 PHA bins.
# Reduced chi-squared = 0.9139 for 57 degrees of freedom
# Null hypothesis probability = 6.593130e-01
Photon flux (15-150 keV) in 1 sec: 0.474259 ( -0.111556 0.112341 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72803e-08 ( -1.13921e-08 1.15003e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.19550 ( )
Epeak [keV] : 706.714 ( )
Norm@50keV : 1.68855E-06 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.96 using 59 PHA bins.
# Reduced chi-squared = 0.9278 for 56 degrees of freedom
# Null hypothesis probability = 6.285223e-01
Photon flux (15-150 keV) in 1 sec: 0.471180 ( -0.118232 0.114759 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.69594e-08 ( -1.26293e-08 1.17975e-08 ) ergs/cm2
Band function
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.800275 ( 0.799918 0.799918 )
beta : -0.850545 ( -0.40483 0.449554 )
Epeak [keV] : 15.9814 ( -15.9858 -15.9858 )
Norm@50keV : 5.97376E-03 ( -0.00282821 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.09 using 59 PHA bins.
# Reduced chi-squared = 0.9471 for 55 degrees of freedom
# Null hypothesis probability = 5.864300e-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] : 23.7639 (-6.12575 10.8414)
R^2/D10^2 : 1.38542E-02 (-0.00932802 0.0214656)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9471 for 57 degrees of freedom
# Null hypothesis probability = 5.890267e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.395e-09 7.921e-10
25- 50 7.707e-09 3.841e-09
50-150 3.245e-08 1.529e-08
15-150 4.156e-08 1.993e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.90663 (-0.465156 0.465131)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.05 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.659451e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.747e-09 2.895e-09
25- 50 9.132e-09 5.460e-09
50-150 2.003e-08 1.199e-08
15-150 3.391e-08 2.005e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.7549 (-1.83597 5.47717)
R1^2/D10^2 : 4.08859E-02 (-337.799 11051.6)
kT2 [keV] : 88.3717 (-6.81905 11.0029)
R2^2/D10^2 : 3.19043E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
#Fit statistic : Chi-Squared = 51.76 using 59 PHA bins.
# Reduced chi-squared = 0.9444 for 55 degrees of freedom
# Reduced chi-squared = 0.9410 for 55 degrees of freedom
# Null hypothesis probability = 5.921745e-01
# Null hypothesis probability = 5.992871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.530e-09 9.542e-10
25- 50 7.109e-09 3.983e-09
50-150 3.351e-08 1.927e-08
15-150 4.315e-08 2.036e-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: 1.52478 ( -0.189501 0.192707 )
Norm@50keV : 8.82766E-04 ( -0.000102599 0.000101482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.72 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 57 degrees of freedom
# Null hypothesis probability = 2.105907e-02
Photon flux (15-150 keV) in 85.28 sec: 0.110955 ( -0.0120725 0.0120787 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11367e-07 ( -9.06228e-08 9.22892e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.875455 ( -0.964378 0.76796 )
Epeak [keV] : 79.4460 ( -25.2636 -79.4485 )
Norm@50keV : 1.97877E-03 ( -0.00114907 0.00456557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.79 using 59 PHA bins.
# Reduced chi-squared = 1.407 for 56 degrees of freedom
# Null hypothesis probability = 2.404245e-02
Photon flux (15-150 keV) in 85.28 sec: 0.107737 ( -0.0127012 0.012533 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63518e-07 ( -1.06006e-07 1.09008e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.01186 ( -5.78492 -3.013 )
beta : -1.82733 ( -0.40402 0.303624 )
Epeak [keV] : 33.0581 ( -10.2321 40.8916 )
Norm@50keV : 1.03362 ( -1.03452 10.2849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.40 using 59 PHA bins.
# Reduced chi-squared = 1.389 for 55 degrees of freedom
# Null hypothesis probability = 2.971720e-02
Photon flux (15-150 keV) in 85.28 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75483e-07 ( -6.74886e-07 -9.81291e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.78e-07
S(50-100 keV) = 2.48e-07
T90 vs. Hardness ratio plot
T90 = 79.8400000333786 sec.
Hardness ratio (energy fluence ratio) = 1.39326
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.5004
Count Ratio (50-100 keV) / (15-25 keV) = 1.01074
Mask shadow pattern
IMX = -1.739427496175877E-01, IMY = -2.225240647271498E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 3.072000
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:
-239.856000 -67.164000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.0623 38.2746 5.0 50.3 -170.1 0.6728 2.3 5.9 Cyg X-2
20.4566 -52.0789 2.6 53.9 -10.0 1.5332 4.4 ------ UNKNOWN
344.7283 19.1682 2.5 31.0 -144.9 0.7259 4.6 ------ UNKNOWN
12.8827 9.9392 3.4 41.1 -97.9 2.1868 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-67.164000 18.112000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
326.3107 38.2038 5.9 50.2 -169.9 0.4293 2.0 9.6 Cyg X-2
308.9065 -52.6632 2.6 47.6 44.3 2.1461 4.4 ------ UNKNOWN
322.1298 -6.0685 0.9 15.8 128.0 1.2096 12.6 ------ UNKNOWN
355.2684 12.2094 2.6 29.2 -120.5 0.6005 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
76.844590 593.744590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7868 10.9490 3.0 37.3 139.0 2.0933 3.8 0.7 GRS 1915+105
299.5908 35.2119 0.6 46.4 176.3 11.5951 20.5 0.6 Cyg X-1
308.2158 41.0145 20.4 48.8 -172.0 -0.3438 -0.6 6.1 Cyg X-3
326.1630 38.3146 127.2 44.5 -153.5 -0.0499 -0.1 0.6 Cyg X-2
2.1797 -39.3860 2.6 49.0 -19.2 2.5242 4.4 ------ UNKNOWN
346.3724 38.4234 3.0 49.8 -133.2 4.9419 3.9 ------ UNKNOWN
Plot creation:
Wed Jun 24 17:47:49 EDT 2015