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
196.6479 18.6928 0.0163 23.3829 64.3599 0.3039897 11.821 TRIG_00555600
Foreground time interval of the image:
-0.072 2.832 (delta_t = 2.904 [sec])
Background time interval of the image:
-239.984 -0.072 (delta_t = 239.912 [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 0.512000
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 0.512000
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 0.512000
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 -0.072 sec. to 2.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35910 ( -0.279662 0.279249 )
Norm@50keV : 6.13270E-03 ( -0.000953225 0.000947467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9453 for 57 degrees of freedom
# Null hypothesis probability = 5.928368e-01
Photon flux (15-150 keV) in 2.904 sec: 0.740211 ( -0.114769 0.114978 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73588e-07 ( -3.03398e-08 3.0828e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.072 sec. to 2.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35588 ( -0.878863 1.37769 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 6.15607E-03 ( -0.000959517 -0.00615621 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9622 for 56 degrees of freedom
# Null hypothesis probability = 5.553756e-01
Photon flux (15-150 keV) in 2.904 sec: 0.739973 ( -0.114392 0.114872 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73459e-07 ( -3.10986e-08 3.06793e-08 ) ergs/cm2
Band function
Time interval is from -0.072 sec. to 2.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92674 ( -4.92674 -4.92674 )
beta : -1.41008 ( -0.342447 0.301869 )
Epeak [keV] : 22.4116 ( -22.4116 8.09569 )
Norm@50keV : 992.770 ( -150.958 2.87841e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9736 for 55 degrees of freedom
# Null hypothesis probability = 5.302410e-01
Photon flux (15-150 keV) in 2.904 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] : 17.5599 (-3.62312 4.75538)
R^2/D10^2 : 4.91301E-02 (-0.0267735 0.0580576)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.49 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 57 degrees of freedom
# Null hypothesis probability = 1.612475e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.876e-09 2.968e-09
25- 50 4.029e-08 1.067e-08
50-150 8.957e-08 2.824e-08
15-150 1.387e-07 3.586e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.03929 (-0.466572 0.466547)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.69 using 59 PHA bins.
# Reduced chi-squared = 0.9771 for 57 degrees of freedom
# Null hypothesis probability = 5.242307e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.198e-08 1.254e-08
25- 50 4.228e-08 2.373e-08
50-150 9.273e-08 5.301e-08
15-150 1.570e-07 8.718e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.32212 (-1.73093 2.85684)
R1^2/D10^2 : 2.05982 (-1.64219 7.0559)
kT2 [keV] : 26.8117 (-7.22882 17.1998)
R2^2/D10^2 : 1.06579E-02 (-0.0083035 0.0198485)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.58 using 59 PHA bins.
# Reduced chi-squared = 0.9560 for 55 degrees of freedom
# Null hypothesis probability = 5.675430e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.227e-08 1.251e-08
25- 50 3.593e-08 1.862e-08
50-150 1.156e-07 6.588e-08
15-150 1.739e-07 9.004e-08
Peak spectrum fit
Power-law model
Time interval is from -0.086 sec. to 0.914 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44142 ( -0.280249 0.280317 )
Norm@50keV : 1.02726E-02 ( -0.0017346 0.00171633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.08 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.160607e-01
Photon flux (15-150 keV) in 1 sec: 1.26331 ( -0.206593 0.206719 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84582e-08 ( -1.83203e-08 1.86794e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.086 sec. to 0.914 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28494 ( )
Epeak [keV] : 215.014 ( )
Norm@50keV : 1.24762E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.00 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 56 degrees of freedom
# Null hypothesis probability = 1.918498e-01
Photon flux (15-150 keV) in 1 sec: 1.25659 ( -0.20994 0.21019 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.6985e-08 ( -2.07868e-08 1.9871e-08 ) ergs/cm2
Band function
Time interval is from -0.086 sec. to 0.914 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99638 ( -4.99638 -4.99638 )
beta : -1.63704 ( -0.447796 0.344434 )
Epeak [keV] : 26.3985 ( -26.3985 6.68635 )
Norm@50keV : 794.383 ( -126.944 1.82464e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.38 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.305555e-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] : 13.4653 (-2.96415 4.21544)
R^2/D10^2 : 0.207755 (-0.206474 0.29418)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.97 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 57 degrees of freedom
# Null hypothesis probability = 4.726804e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.980e-09 2.411e-09
25- 50 2.853e-08 7.580e-09
50-150 3.336e-08 1.231e-08
15-150 6.987e-08 1.813e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-91.1168 -199.363)
Norm : 5.18729 (-0.840777 0.84077)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.31 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.103230e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.292e-08 7.435e-09
25- 50 2.485e-08 1.386e-08
50-150 5.449e-08 3.114e-08
15-150 9.226e-08 5.250e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.62925 (-2.1801 2.82673)
R1^2/D10^2 : 1.15078 (-0.748763 1.38306)
kT2 [keV] : 36.5954 (-29.2034 -36.6021)
R2^2/D10^2 : 5.62722E-03 (-0.00505494 0.0130662)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.19 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.354911e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.270e-08 7.315e-09
25- 50 2.564e-08 1.422e-08
50-150 6.276e-08 3.608e-08
15-150 1.011e-07 5.139e-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: 1.35910 ( -0.279662 0.279249 )
Norm@50keV : 6.13270E-03 ( -0.000953225 0.000947467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9453 for 57 degrees of freedom
# Null hypothesis probability = 5.928368e-01
Photon flux (15-150 keV) in 2.904 sec: 0.740211 ( -0.114769 0.114978 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73588e-07 ( -3.03398e-08 3.0828e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35588 ( -0.878863 1.37769 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 6.15607E-03 ( -0.000959517 -0.00615621 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9622 for 56 degrees of freedom
# Null hypothesis probability = 5.553756e-01
Photon flux (15-150 keV) in 2.904 sec: 0.739973 ( -0.114392 0.114872 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73459e-07 ( -3.10986e-08 3.06793e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92674 ( -4.92674 -4.92674 )
beta : -1.41008 ( -0.342447 0.301869 )
Epeak [keV] : 22.4116 ( -22.4116 8.09569 )
Norm@50keV : 992.770 ( -150.958 2.87841e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9736 for 55 degrees of freedom
# Null hypothesis probability = 5.302410e-01
Photon flux (15-150 keV) in 2.904 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) = 3.99e-08
S(50-100 keV) = 6.22e-08
T90 vs. Hardness ratio plot
T90 = 2.7399999499321 sec.
Hardness ratio (energy fluence ratio) = 1.5589
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.953894
Count Ratio (50-100 keV) / (15-25 keV) = 0.953034
Mask shadow pattern
IMX = 1.871003769884335E-01, IMY = -3.898075904469647E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.984000 -0.072000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
162.0579 -21.7845 2.5 50.7 150.0 5.3870 4.6 ------ UNKNOWN
204.0058 17.0584 2.8 30.4 60.7 1.2889 4.1 ------ UNKNOWN
161.5089 -3.9707 2.3 33.6 158.0 1.6129 5.0 ------ UNKNOWN
153.4806 -10.6746 3.2 42.9 165.8 1.5773 3.6 ------ UNKNOWN
125.8726 -9.8181 3.5 59.1 -165.9 4.4855 3.3 ------ UNKNOWN
122.6051 -5.1641 4.2 58.8 -159.3 3.8369 2.8 ------ UNKNOWN
148.1494 72.8606 3.2 47.1 -53.1 3.3602 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.072000 2.832000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
161.4060 -13.9518 2.2 43.2 153.4 0.2407 5.2 ------ UNKNOWN
196.6479 18.6928 1.0 23.4 64.4 0.3040 11.8 ------ UNKNOWN
130.3118 11.3172 2.3 43.3 -146.9 0.1820 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
55.916600 962.097900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3700 35.2140 6.2 53.3 12.1 -4.2776 -1.9 8.8 Her X-1
243.4681 9.3929 2.4 46.3 47.4 10.9697 4.7 ------ UNKNOWN
202.7544 -18.1355 3.6 37.3 122.9 4.3798 3.2 ------ UNKNOWN
225.3338 17.6286 2.8 27.3 40.2 2.5779 4.2 ------ UNKNOWN
249.6084 37.0926 2.6 49.6 9.3 5.7770 4.5 ------ UNKNOWN
211.0683 19.3219 3.0 13.7 37.6 2.1381 3.9 ------ UNKNOWN
178.3899 5.5220 4.2 22.1 -171.8 1.5573 3.1 ------ UNKNOWN
178.3471 5.9414 4.9 21.9 -170.8 1.4822 2.9 ------ UNKNOWN
247.9127 61.2625 3.8 55.5 -20.4 5.8632 3.0 ------ UNKNOWN
143.3998 -7.6270 4.2 58.7 -159.2 11.8164 2.8 ------ UNKNOWN
143.2311 -5.2797 3.4 57.8 -156.6 12.5278 3.3 ------ UNKNOWN
186.8210 65.4180 3.7 47.2 -53.0 8.9810 3.1 ------ UNKNOWN
Plot creation:
Sat May 30 16:54:58 EDT 2015