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
104.1310 41.7870 0.0074 46.6078 155.6688 8.1692408 26.035 TRIG_00586680
Foreground time interval of the image:
-1.472 14.981 (delta_t = 16.453 [sec])
Background time interval of the image:
-239.920 -1.472 (delta_t = 238.448 [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)
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 -1.472 sec. to 35.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09874 ( -0.0733605 0.0724535 )
Norm@50keV : 1.85515E-02 ( -0.000765325 0.000762752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9363 for 57 degrees of freedom
# Null hypothesis probability = 6.120264e-01
Photon flux (15-150 keV) in 37.33 sec: 2.15158 ( -0.0937347 0.0940828 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.24348e-06 ( -2.99514e-07 2.99971e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.472 sec. to 35.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09636 ( -0.134624 0.070617 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.86464E-02 ( -0.000764677 0.00334072 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.43 using 59 PHA bins.
# Reduced chi-squared = 0.9541 for 56 degrees of freedom
# Null hypothesis probability = 5.727744e-01
Photon flux (15-150 keV) in 37.33 sec: 2.15079 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.24198e-06 ( -2.94944e-07 3.00768e-07 ) ergs/cm2
Band function
Time interval is from -1.472 sec. to 35.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99996 ( -4.99996 -4.99996 )
beta : -1.11625 ( -0.0758599 0.0760599 )
Epeak [keV] : 23.9489 ( -23.9489 4.38679 )
Norm@50keV : 1743.91 ( -69.0446 3.50235e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9496 for 55 degrees of freedom
# Null hypothesis probability = 5.812187e-01
Photon flux (15-150 keV) in 37.33 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] : 22.9566 ( )
R^2/D10^2 : 6.43175E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 202.25 using 59 PHA bins.
# Reduced chi-squared = 3.5482 for 57 degrees of freedom
# Null hypothesis probability = 3.916469e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.295e-07 2.087e-08
25- 50 1.244e-06 8.101e-08
50-150 4.897e-06 2.800e-07
15-150 6.371e-06 2.930e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 9.24132 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 177.65 using 59 PHA bins.
# Reduced chi-squared = 3.1167 for 57 degrees of freedom
# Null hypothesis probability = 2.553258e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.590e-07 3.864e-08
25- 50 1.652e-06 7.149e-08
50-150 3.624e-06 1.689e-07
15-150 6.136e-06 2.613e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.86303 (-1.25433 1.41761)
R1^2/D10^2 : 0.866533 (-0.319441 0.559923)
kT2 [keV] : 41.9955 (-6.41499 10.7303)
R2^2/D10^2 : 8.57112E-03 (-0.0040229 0.00560561)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9522 for 55 degrees of freedom
# Null hypothesis probability = 5.756338e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.610e-07 7.597e-08
25- 50 1.504e-06 1.820e-07
50-150 5.298e-06 6.757e-07
15-150 7.363e-06 9.295e-07
Peak spectrum fit
Power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.927833 ( -0.147941 0.144951 )
Norm@50keV : 6.87777E-02 ( -0.00620998 0.00618281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.57 using 59 PHA bins.
# Reduced chi-squared = 0.9924 for 57 degrees of freedom
# Null hypothesis probability = 4.912277e-01
Photon flux (15-150 keV) in 1 sec: 7.89735 ( -0.716438 0.717196 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.63668e-07 ( -7.22602e-08 7.24054e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.612403 ( -0.609691 0.384718 )
Epeak [keV] : 268.456 ( -268.455 -268.455 )
Norm@50keV : 9.38684E-02 ( -0.0295047 0.0717171 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 0.9928 for 56 degrees of freedom
# Null hypothesis probability = 4.901357e-01
Photon flux (15-150 keV) in 1 sec: 7.85076 ( -0.72054 0.72164 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62158e-07 ( -7.3434e-08 7.3278e-08 ) ergs/cm2
Band function
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.00330 ( -0.16968 0.165143 )
Epeak [keV] : 29.7016 ( -29.7016 6.72912 )
Norm@50keV : 1652.02 ( -144.708 9.35018e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.48 using 59 PHA bins.
# Reduced chi-squared = 0.9905 for 55 degrees of freedom
# Null hypothesis probability = 4.944746e-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] : 24.9472 (-2.79143 3.27864)
R^2/D10^2 : 0.202327 (-0.0635896 0.0889605)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.53 using 59 PHA bins.
# Reduced chi-squared = 1.325 for 57 degrees of freedom
# Null hypothesis probability = 5.079151e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.190e-08 3.795e-09
25- 50 1.241e-07 1.815e-08
50-150 5.729e-07 7.575e-08
15-150 7.189e-07 8.445e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 31.2215 (-2.94924 2.94917)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.75 using 59 PHA bins.
# Reduced chi-squared = 1.8202 for 57 degrees of freedom
# Null hypothesis probability = 1.529928e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.772e-08 2.210e-08
25- 50 1.495e-07 7.747e-08
50-150 3.279e-07 1.761e-07
15-150 5.551e-07 2.036e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30873 (-1.96528 2.8171)
R1^2/D10^2 : 4.43137 (-2.87962 8.81203)
kT2 [keV] : 34.1354 (-5.93538 10.639)
R2^2/D10^2 : 6.89921E-02 (-0.0386772 0.0724488)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.44 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 55 degrees of freedom
# Null hypothesis probability = 5.729114e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.126e-08 2.433e-08
25- 50 1.340e-07 5.100e-08
50-150 5.920e-07 1.907e-07
15-150 7.773e-07 2.622e-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: 0.978906 ( -0.0687717 0.067874 )
Norm@50keV : 3.50744E-02 ( -0.00140291 0.00139649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.66 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.269292e-01
Photon flux (15-150 keV) in 16.45 sec: 4.03415 ( -0.165256 0.165615 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.28632e-06 ( -3.69383e-07 2.46225e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.972492 ( -0.265432 0.0754755 )
Epeak [keV] : 9999.99 ( )
Norm@50keV : 3.52897E-02 ( -0.00140628 0.00132466 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.65 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 56 degrees of freedom
# Null hypothesis probability = 2.002191e-01
Photon flux (15-150 keV) in 16.45 sec: 4.03225 ( -0.1645 0.16593 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.29757e-06 ( -2.36633e-07 2.38821e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99996 -4.99996 )
beta : -0.987836 ( -0.0698851 0.0703277 )
Epeak [keV] : 23.1876 ( -23.1876 5.82681 )
Norm@50keV : 3561.42 ( -133.672 5.25589e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.30 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 55 degrees of freedom
# Null hypothesis probability = 1.831021e-01
Photon flux (15-150 keV) in 16.45 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) = 1.43e-06
S(50-100 keV) = 2.67e-06
T90 vs. Hardness ratio plot
T90 = 25.6320000290871 sec.
Hardness ratio (energy fluence ratio) = 1.86713
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.86422
Count Ratio (50-100 keV) / (15-25 keV) = 1.99075
Mask shadow pattern
IMX = -9.638086568856981E-01, IMY = -4.358076949019931E-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:
-239.920000 -1.472000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
109.7571 30.5394 2.8 46.5 138.9 4.2201 4.1 ------ UNKNOWN
161.1466 15.7843 3.4 22.8 53.1 0.8800 3.4 ------ UNKNOWN
194.8764 -7.4623 2.3 52.9 3.9 3.3668 5.0 ------ UNKNOWN
223.8811 84.9261 3.0 49.2 -133.7 4.2546 3.9 ------ UNKNOWN
223.5093 71.1299 2.5 43.8 -116.2 5.1476 4.7 ------ UNKNOWN
227.0921 79.6737 2.7 47.4 -127.1 4.5142 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.472000 14.980600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
182.0660 -13.4622 3.2 53.8 21.3 1.2487 3.6 ------ UNKNOWN
104.1310 41.7870 0.4 46.6 155.7 8.1688 26.0 ------ UNKNOWN
198.9244 31.1300 2.7 27.7 -44.6 0.3223 4.3 ------ UNKNOWN
222.3708 52.2314 2.4 40.9 -88.3 1.0883 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
105.380610 962.150000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6251 22.0158 0.2 26.2 -156.1 21.0297 46.5 0.5 Crab
136.1658 12.7169 3.9 40.2 103.4 5.0623 3.0 ------ UNKNOWN
95.5681 -2.9443 2.7 45.4 168.6 3.9109 4.2 ------ UNKNOWN
43.1048 55.0778 2.6 41.1 -73.1 7.2845 4.4 ------ UNKNOWN
51.8114 31.1664 3.4 42.7 -110.3 5.8578 3.4 ------ UNKNOWN
Plot creation:
Mon Jun 8 22:33:03 EDT 2015