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
85.2364 -4.4021 0.0029 18.1276 178.4870 3.2945669 67.137 TRIG_00582374
Foreground time interval of the image:
0.384 9.485 (delta_t = 9.101 [sec])
Background time interval of the image:
-103.315 0.384 (delta_t = 103.699 [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)
The mask-weighted light curves based on cleaned DPHs
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 0.384 sec. to 96.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07302 ( -0.0416669 0.0413998 )
Norm@50keV : 6.80265E-03 ( -0.000153809 0.000153249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.51 using 59 PHA bins.
# Reduced chi-squared = 0.8685 for 57 degrees of freedom
# Null hypothesis probability = 7.492452e-01
Photon flux (15-150 keV) in 96 sec: 0.787131 ( -0.0188001 0.0188676 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.88777e-06 ( -1.53683e-07 1.53843e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.384 sec. to 96.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06726 ( -0.0419691 0.0417332 )
Epeak [keV] : 9988.07 ( -9987.54 -9987.54 )
Norm@50keV : 6.83998E-03 ( -0.000146557 0.00109987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.8839 for 56 degrees of freedom
# Null hypothesis probability = 7.176646e-01
Photon flux (15-150 keV) in 96 sec: 0.786754 ( -0.018453 0.018723 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.88975e-06 ( -1.4735e-07 1.53389e-07 ) ergs/cm2
Band function
Time interval is from 0.384 sec. to 96.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.891081 ( 0.891081 0.891081 )
beta : -1.07302 ( -0.041377 0.0416979 )
Epeak [keV] : 40.9337 ( -40.9337 -40.9337 )
Norm@50keV : 1.17577E-02 ( -0.00413424 313711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.51 using 59 PHA bins.
# Reduced chi-squared = 0.9001 for 55 degrees of freedom
# Null hypothesis probability = 6.837769e-01
Photon flux (15-150 keV) in 96 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] : 23.2364 ( )
R^2/D10^2 : 2.26572E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 422.91 using 59 PHA bins.
# Reduced chi-squared = 7.4195 for 57 degrees of freedom
# Null hypothesis probability = 2.576337e-57
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.118e-07 9.984e-09
25- 50 1.156e-06 3.840e-08
50-150 4.659e-06 1.469e-07
15-150 6.026e-06 1.550e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.41950 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 473.64 using 59 PHA bins.
# Reduced chi-squared = 8.3095 for 57 degrees of freedom
# Null hypothesis probability = 5.509208e-67
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.174e-07 1.992e-08
25- 50 1.572e-06 3.696e-08
50-150 3.449e-06 8.736e-08
15-150 5.839e-06 1.517e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.88356 (-0.84889 0.92639)
R1^2/D10^2 : 0.283702 (-0.0742064 0.107777)
kT2 [keV] : 38.4631 (-3.49882 4.74872)
R2^2/D10^2 : 4.08944E-03 (-0.001206 0.00142002)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9855 for 55 degrees of freedom
# Null hypothesis probability = 5.051235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.927e-07 4.061e-08
25- 50 1.385e-06 7.104e-08
50-150 5.044e-06 2.674e-07
15-150 6.922e-06 3.120e-07
Peak spectrum fit
Power-law model
Time interval is from 7.884 sec. to 8.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47519 ( -0.484478 0.477425 )
Norm@50keV : 4.27814E-03 ( -0.00120308 0.0011806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.67 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.576194e-01
Photon flux (15-150 keV) in 1 sec: 0.530597 ( -0.14437 0.144683 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07543e-08 ( -1.2332e-08 1.271e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.884 sec. to 8.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48422 ( -0.898549 0.471783 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.26806E-03 ( -0.00120795 0.0162364 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.67 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 56 degrees of freedom
# Null hypothesis probability = 1.364705e-01
Photon flux (15-150 keV) in 1 sec: 0.531297 ( -0.145242 0.143471 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.04982e-08 ( -1.359e-08 1.28051e-08 ) ergs/cm2
Band function
Time interval is from 7.884 sec. to 8.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90967 ( -4.90967 -4.90967 )
beta : -2.09582 ( -2.94786 0.80872 )
Epeak [keV] : 33.8877 ( -33.8877 9.93743 )
Norm@50keV : 71.7039 ( -18.7914 2.55947e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.90 using 59 PHA bins.
# Reduced chi-squared = 1.198 for 55 degrees of freedom
# Null hypothesis probability = 1.491817e-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] : 10.6717 (-2.50387 4.12154)
R^2/D10^2 : 0.205365 (-0.144913 0.348254)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.53 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 57 degrees of freedom
# Null hypothesis probability = 1.233799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.854e-09 2.809e-09
25- 50 1.319e-08 7.220e-09
50-150 8.287e-09 5.421e-09
15-150 2.633e-08 1.271e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.17382 (-0.58465 0.585052)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.88 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 57 degrees of freedom
# Null hypothesis probability = 1.533705e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.413e-09 3.304e-09
25- 50 1.041e-08 6.305e-09
50-150 2.284e-08 1.386e-08
15-150 3.866e-08 2.352e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.363 (-199.363 -199.363)
R1^2/D10^2 : 8.11927E-05 (-4.56645e-05 0.00191148)
kT2 [keV] : 8.95545 (-2.07472 2.37511)
R2^2/D10^2 : 0.344401 (-0.224854 0.55101)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.357554e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.468e-09 3.268e-09
25- 50 1.219e-08 7.400e-09
50-150 2.575e-08 5.745e-09
15-150 4.341e-08 1.759e-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: 1.30451 ( -0.0460613 0.0459512 )
Norm@50keV : 2.34778E-02 ( -0.000592542 0.000592443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.96 using 59 PHA bins.
# Reduced chi-squared = 1.438 for 57 degrees of freedom
# Null hypothesis probability = 1.682273e-02
Photon flux (15-150 keV) in 9.101 sec: 2.80330 ( -0.0764402 0.0765849 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10916e-06 ( -5.63995e-08 5.64408e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03804 ( -0.191699 0.183788 )
Epeak [keV] : 203.500 ( -61.7322 297.375 )
Norm@50keV : 3.09451E-02 ( -0.00524398 0.00660183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.74 using 59 PHA bins.
# Reduced chi-squared = 1.353 for 56 degrees of freedom
# Null hypothesis probability = 4.057154e-02
Photon flux (15-150 keV) in 9.101 sec: 2.75807 ( -0.08181 0.08201 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07893e-06 ( -6.08857e-08 6.06491e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.119972 ( -0.801711 1.45382 )
beta : -1.41374 ( -0.112949 0.0757557 )
Epeak [keV] : 60.1980 ( -20.5431 77.081 )
Norm@50keV : 0.114015 ( -0.118176 1.08393 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.89 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 55 degrees of freedom
# Null hypothesis probability = 8.521078e-02
Photon flux (15-150 keV) in 9.101 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) = 1.34e-06
S(50-100 keV) = 2.54e-06
T90 vs. Hardness ratio plot
T90 = 48 sec.
Hardness ratio (energy fluence ratio) = 1.89552
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.73071
Count Ratio (50-100 keV) / (15-25 keV) = 1.75457
Mask shadow pattern
IMX = -3.272700866210436E-01, IMY = -8.643914241720100E-03
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:
-103.315400 0.384000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6304 22.0158 0.3 8.5 12.6 4.3327 38.0 0.2 Crab
68.6547 -44.6062 3.3 59.5 -161.8 3.2238 3.5 ------ UNKNOWN
51.3359 -21.9913 3.3 47.0 -132.0 1.5475 3.5 ------ UNKNOWN
45.1920 -7.1970 2.8 42.6 -110.2 2.3842 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.384000 9.484590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.7768 22.1579 10.9 8.7 13.4 0.0526 1.1 11.7 Crab
122.9643 49.2071 2.3 48.6 41.0 1.2334 5.0 ------ UNKNOWN
85.2364 -4.4021 0.2 18.1 178.5 3.2946 67.2 ------ UNKNOWN
44.7185 -4.6296 3.9 41.8 -106.5 0.6448 3.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
80.084610 482.514000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6331 22.0206 0.4 26.5 62.6 4.9960 26.4 0.4 Crab
135.5324 -40.4585 14.8 57.7 -158.0 0.6627 0.8 5.8 Vela X-1
59.0670 26.1047 2.6 39.7 27.5 1.0956 4.5 ------ UNKNOWN
85.2232 -4.4356 2.2 0.0 152.3 0.7006 5.2 ------ UNKNOWN
86.1908 -33.9631 2.7 29.5 -115.8 0.7861 4.3 ------ UNKNOWN
136.5798 -42.4884 3.3 59.3 -156.3 3.6787 3.5 ------ UNKNOWN
47.5324 -30.0658 3.3 43.8 -64.3 2.5834 3.5 ------ UNKNOWN
Plot creation:
Tue Jun 9 23:53:54 EDT 2015