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
168.6199 -30.4130 0.0164 47.4554 -14.6502 0.2510439 11.608 TRIG_00544027
Foreground time interval of the image:
-0.364 0.796 (delta_t = 1.160 [sec])
Background time interval of the image:
-239.920 -0.364 (delta_t = 239.556 [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 -0.364 sec. to 0.796 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50354 ( -0.289473 0.289525 )
Norm@50keV : 1.29155E-02 ( -0.00205451 0.0020439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.39 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.633144e-01
Photon flux (15-150 keV) in 1.16 sec: 1.61390 ( -0.2662 0.267313 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42044e-07 ( -2.43221e-08 2.44569e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.364 sec. to 0.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51920 ( -0.309131 0.275563 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.28474E-02 ( -0.00204749 0.00871891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.42 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 56 degrees of freedom
# Null hypothesis probability = 1.411831e-01
Photon flux (15-150 keV) in 1.16 sec: 1.62552 ( -0.28163 0.25768 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41836e-07 ( -2.41002e-08 2.38276e-08 ) ergs/cm2
Band function
Time interval is from -0.364 sec. to 0.796 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87822 ( -4.87822 -4.87822 )
beta : -1.59753 ( -0.356754 0.324265 )
Epeak [keV] : 24.6754 ( -24.6754 6.61169 )
Norm@50keV : 1224.27 ( -190.893 7.6226e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.409610e-01
Photon flux (15-150 keV) in 1.16 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] : 14.7933 (-4.58445 7.35734)
R^2/D10^2 : 0.179935 (-0.174871 0.490425)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.95 using 59 PHA bins.
# Reduced chi-squared = 1.596 for 57 degrees of freedom
# Null hypothesis probability = 2.850851e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.584e-09 3.452e-09
25- 50 3.759e-08 1.105e-08
50-150 5.564e-08 1.976e-08
15-150 1.028e-07 2.611e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-84.9278 -199.363)
Norm : 6.59700 (-1.04125 1.04358)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.21 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.288490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.906e-08 1.086e-08
25- 50 3.666e-08 2.042e-08
50-150 8.039e-08 4.520e-08
15-150 1.361e-07 7.673e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.82278 (-1.57586 2.06355)
R1^2/D10^2 : 2.47624 (-1.57203 4.53307)
kT2 [keV] : 49.0024 (-19.6593 -49.0024)
R2^2/D10^2 : 3.40127E-03 (-0.00314705 0.0115086)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.67 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.499490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.195e-08 1.210e-08
25- 50 3.478e-08 1.878e-08
50-150 9.464e-08 5.265e-08
15-150 1.514e-07 7.023e-08
Peak spectrum fit
Power-law model
Time interval is from -0.208 sec. to 0.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46916 ( -0.306643 0.305271 )
Norm@50keV : 1.34529E-02 ( -0.00223013 0.00222174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.84 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 57 degrees of freedom
# Null hypothesis probability = 4.809236e-01
Photon flux (15-150 keV) in 1 sec: 1.66591 ( -0.288117 0.289472 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2829e-07 ( -2.29968e-08 2.31268e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 0.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48332 ( -0.324387 0.292173 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 1.34731E-02 ( -0.00222688 0.00954666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.86 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.426384e-01
Photon flux (15-150 keV) in 1 sec: 1.67873 ( -0.30003 0.27914 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28045e-07 ( -2.2633e-08 2.2399e-08 ) ergs/cm2
Band function
Time interval is from -0.208 sec. to 0.792 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91640 ( -4.9164 -4.9164 )
beta : -1.55643 ( -0.386112 0.339685 )
Epeak [keV] : 24.6883 ( -24.6883 6.90967 )
Norm@50keV : 1313.49 ( -214.535 7.766e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.390547e-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] : 15.6588 (-5.00781 8.05546)
R^2/D10^2 : 0.153197 (-0.149217 0.439862)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.21 using 59 PHA bins.
# Reduced chi-squared = 1.372 for 57 degrees of freedom
# Null hypothesis probability = 3.262445e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.803e-09 2.975e-09
25- 50 3.222e-08 9.270e-09
50-150 5.476e-08 1.925e-08
15-150 9.479e-08 2.643e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-83.1004 -199.363)
Norm : 6.84103 (-1.13291 1.13291)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.71 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.124824e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.704e-08 1.013e-08
25- 50 3.277e-08 1.844e-08
50-150 7.187e-08 4.073e-08
15-150 1.217e-07 6.880e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.87133 (-1.70377 2.28592)
R1^2/D10^2 : 2.44801 (-1.61896 3.04166)
kT2 [keV] : 50.1637 (-20.8392 -50.1619)
R2^2/D10^2 : 3.41490E-03 (-0.00318612 0.0121837)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.80 using 59 PHA bins.
# Reduced chi-squared = 0.9419 for 55 degrees of freedom
# Null hypothesis probability = 5.975477e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.914e-08 1.083e-08
25- 50 3.082e-08 1.610e-08
50-150 8.669e-08 4.795e-08
15-150 1.366e-07 6.793e-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: 1.50354 ( -0.289473 0.289525 )
Norm@50keV : 1.29155E-02 ( -0.00205451 0.0020439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.39 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.633144e-01
Photon flux (15-150 keV) in 1.16 sec: 1.61390 ( -0.2662 0.267313 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42044e-07 ( -2.43221e-08 2.44569e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51920 ( -0.309131 0.275563 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.28474E-02 ( -0.00204749 0.00871891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.42 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 56 degrees of freedom
# Null hypothesis probability = 1.411831e-01
Photon flux (15-150 keV) in 1.16 sec: 1.62552 ( -0.28163 0.25768 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41836e-07 ( -2.41002e-08 2.38276e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87822 ( -4.87822 -4.87822 )
beta : -1.59753 ( -0.356754 0.324265 )
Epeak [keV] : 24.6754 ( -24.6754 6.61169 )
Norm@50keV : 1224.27 ( -190.893 7.6226e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.409610e-01
Photon flux (15-150 keV) in 1.16 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) = 3.52e-08
S(50-100 keV) = 4.96e-08
T90 vs. Hardness ratio plot
T90 = 1.01199996471405 sec.
Hardness ratio (energy fluence ratio) = 1.40909
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.895246
Count Ratio (50-100 keV) / (15-25 keV) = 0.82923
Mask shadow pattern
IMX = 1.054177635931437E+00, IMY = 2.755788578305471E-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 -0.364000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
124.3890 3.6443 2.8 40.4 67.0 2.5276 4.1 ------ UNKNOWN
143.7577 -10.1489 4.2 33.2 28.6 0.6230 2.8 ------ UNKNOWN
163.1025 42.1210 2.8 25.4 171.1 0.7106 4.1 ------ UNKNOWN
216.2534 59.8671 3.3 57.4 -160.1 2.8886 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.364000 0.796000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
125.3233 30.6914 2.5 37.3 110.5 0.1205 4.5 ------ UNKNOWN
156.9944 -32.7443 2.4 49.9 -1.5 0.1185 4.7 ------ UNKNOWN
168.6199 -30.4130 1.0 47.5 -14.7 0.2511 11.6 ------ UNKNOWN
216.3456 62.3988 2.3 58.5 -162.8 0.2839 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
84.380590 850.680590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4862 -40.5738 2.3 28.6 31.6 2.8298 5.1 2.2 Vela X-1
170.3884 -60.7970 18.0 30.4 -30.2 0.3180 0.6 10.7 Cen X-3
186.6787 -62.7789 0.6 34.4 -43.0 10.0087 17.9 0.8 GX 301-2
99.1702 -52.1340 3.5 54.2 16.7 8.3702 3.3 ------ UNKNOWN
123.4099 -58.7572 3.3 41.6 5.2 2.2411 3.6 ------ UNKNOWN
152.6216 -58.3417 2.1 30.0 -11.6 2.5677 5.4 ------ UNKNOWN
111.7145 -74.1780 3.2 52.0 -11.6 4.1899 3.6 ------ UNKNOWN
176.9814 -61.9745 2.3 32.0 -35.9 2.3622 5.0 ------ UNKNOWN
220.3736 -74.2808 3.8 50.8 -44.4 6.3457 3.0 ------ UNKNOWN
Plot creation:
Sat May 30 17:37:58 EDT 2015