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
283.4361 -54.2823 0.0121 24.1920 141.3940 0.1966767 15.800 TRIG_00555880
Foreground time interval of the image:
-0.036 0.332 (delta_t = 0.368 [sec])
Background time interval of the image:
-147.895 -0.036 (delta_t = 147.859 [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 0.064000
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 0.064000
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 0.064000
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 -0.036 sec. to 0.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.769505 ( -0.186431 0.180604 )
Norm@50keV : 3.45164E-02 ( -0.00366744 0.00363866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.347632e-01
Photon flux (15-150 keV) in 0.368 sec: 3.97214 ( -0.411815 0.412224 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50369e-07 ( -1.7025e-08 1.71261e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.330394 ( -0.903696 0.561598 )
Epeak [keV] : 233.671 ( -233.591 -233.591 )
Norm@50keV : 5.24673E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.00 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.329590e-01
Photon flux (15-150 keV) in 0.368 sec: 3.91073 ( -0.42795 0.42584 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48332e-07 ( -1.78292e-08 1.76953e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00918 ( 1.00897 1.00897 )
beta : -0.769506 ( -0.180552 0.186731 )
Epeak [keV] : 16.6116 ( -16.6157 -16.6157 )
Norm@50keV : 4.62665E-02 ( -0.0153323 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.695988e-01
Photon flux (15-150 keV) in 0.368 sec: 3.93659 ( ) 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] : 26.2797 (-3.45838 4.34702)
R^2/D10^2 : 8.88661E-02 (-0.0317177 0.0458792)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.08 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.697780e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.819e-09 7.579e-10
25- 50 2.221e-08 4.002e-09
50-150 1.127e-07 1.967e-08
15-150 1.387e-07 2.123e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 14.8602 (-1.67197 1.67193)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.61 using 59 PHA bins.
# Reduced chi-squared = 1.8879 for 57 degrees of freedom
# Null hypothesis probability = 5.856546e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.362e-08 7.625e-09
25- 50 2.620e-08 1.445e-08
50-150 5.746e-08 3.148e-08
15-150 9.727e-08 5.376e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.92992 (-1.76676 3.78909)
R1^2/D10^2 : 18.3893 (-17.2309 525.959)
kT2 [keV] : 29.7090 (-4.59053 7.00624)
R2^2/D10^2 : 5.97975E-02 (-0.0277578 0.0415501)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.70 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.112678e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.703e-09 4.201e-09
25- 50 2.072e-08 4.869e-09
50-150 1.176e-07 2.565e-08
15-150 1.470e-07 2.828e-08
Peak spectrum fit
Power-law model
Time interval is from -0.350 sec. to 0.650 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.890949 ( -0.241533 0.232596 )
Norm@50keV : 1.24751E-02 ( -0.00173902 0.0017273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.247819e-01
Photon flux (15-150 keV) in 1 sec: 1.43180 ( -0.198831 0.19933 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40504e-07 ( -2.07297e-08 2.0881e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.350 sec. to 0.650 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.187105 ( -1.62994 1.08327 )
Epeak [keV] : 122.529 ( -38.9219 -122.412 )
Norm@50keV : 3.50532E-02 ( -0.0351439 0.109365 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 0.9952 for 56 degrees of freedom
# Null hypothesis probability = 4.850949e-01
Photon flux (15-150 keV) in 1 sec: 1.36704 ( -0.21567 0.21237 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34737e-07 ( -2.2379e-08 2.2243e-08 ) ergs/cm2
Band function
Time interval is from -0.350 sec. to 0.650 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.875008 ( 0.875088 0.875088 )
beta : -0.906585 ( -0.23262 0.241314 )
Epeak [keV] : 10000.00 ( -10000 -10000 )
Norm@50keV : 1.25435E-02 ( -0.00173621 0.00169606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.34 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.537715e-01
Photon flux (15-150 keV) in 1 sec: 1.37886 ( ) 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] : 23.5775 (-3.54994 4.62488)
R^2/D10^2 : 4.36107E-02 (-0.0183593 0.028752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.733785e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.340e-09 1.225e-09
25- 50 2.387e-08 5.670e-09
50-150 9.901e-08 2.321e-08
15-150 1.272e-07 2.453e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.65417 (-0.822749 0.822731)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.47 using 59 PHA bins.
# Reduced chi-squared = 1.377 for 57 degrees of freedom
# Null hypothesis probability = 3.121313e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.407e-08 7.975e-09
25- 50 2.707e-08 1.551e-08
50-150 5.938e-08 3.332e-08
15-150 1.005e-07 5.620e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.15037 (-2.41238 6.14191)
R1^2/D10^2 : 18.6426 (-18.5077 393.168)
kT2 [keV] : 25.2842 (-4.22367 5.14281)
R2^2/D10^2 : 3.42302E-02 (-0.0174678 0.0183116)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.13 using 59 PHA bins.
# Reduced chi-squared = 0.9660 for 55 degrees of freedom
# Null hypothesis probability = 5.464368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.471e-09 3.571e-09
25- 50 2.237e-08 7.175e-09
50-150 1.020e-07 3.117e-08
15-150 1.329e-07 3.375e-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: 0.769505 ( -0.186431 0.180604 )
Norm@50keV : 3.45164E-02 ( -0.00366744 0.00363866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.347632e-01
Photon flux (15-150 keV) in 0.368 sec: 3.97214 ( -0.411815 0.412224 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50369e-07 ( -1.7025e-08 1.71261e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.330394 ( -0.903696 0.561598 )
Epeak [keV] : 233.671 ( -233.591 -233.591 )
Norm@50keV : 5.24673E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.00 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.329590e-01
Photon flux (15-150 keV) in 0.368 sec: 3.91073 ( -0.42795 0.42584 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48332e-07 ( -1.78292e-08 1.76953e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00918 ( 1.00897 1.00897 )
beta : -0.769506 ( -0.180552 0.186731 )
Epeak [keV] : 16.6116 ( -16.6157 -16.6157 )
Norm@50keV : 4.62665E-02 ( -0.0153323 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.98 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.695988e-01
Photon flux (15-150 keV) in 0.368 sec: 3.93659 ( ) 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) = 2.37e-08
S(50-100 keV) = 5.57e-08
T90 vs. Hardness ratio plot
T90 = 0.295999944210052 sec.
Hardness ratio (energy fluence ratio) = 2.35021
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.80089
Count Ratio (50-100 keV) / (15-25 keV) = 2.78941
Mask shadow pattern
IMX = -3.510695361386565E-01, IMY = -2.803151470316865E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-147.895410 -0.036000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2245 -60.6206 4.2 35.5 13.0 0.5910 2.8 2.7 Cen X-3
187.1008 -62.7699 105.7 30.7 25.3 0.0223 0.1 12.2 GX 301-2
264.7253 -44.2902 74.2 35.0 117.9 0.0568 0.2 9.6 4U 1735-44
232.6834 -44.7627 2.4 38.9 80.2 2.8965 4.8 ------ UNKNOWN
166.2416 -66.7983 2.3 30.3 6.2 0.8911 5.0 ------ UNKNOWN
315.5066 -58.7336 2.6 22.2 -171.9 0.6599 4.4 ------ UNKNOWN
338.8428 -72.5978 2.1 14.2 -122.5 0.7934 5.4 ------ UNKNOWN
337.3728 -24.7549 3.5 58.7 -159.2 3.5815 3.3 ------ UNKNOWN
119.6331 -42.0796 2.3 59.1 -24.2 5.8691 4.9 ------ UNKNOWN
98.4815 -49.3963 3.0 52.1 -42.2 3.5108 3.8 ------ UNKNOWN
357.3110 -36.4895 2.5 51.0 -135.6 4.0220 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.036000 0.332000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0834 -60.6190 5.7 35.5 12.9 -0.0285 -2.0 6.8 Cen X-3
186.8417 -62.6680 3.8 30.8 25.2 0.0415 3.0 8.0 GX 301-2
264.9090 -44.4620 6.3 34.8 118.1 -0.0433 -1.8 7.1 4U 1735-44
238.0437 -43.7620 1.8 39.0 86.5 0.2745 6.3 ------ UNKNOWN
283.4361 -54.2823 0.7 24.2 141.4 0.1967 15.8 ------ UNKNOWN
237.6035 -79.4410 2.7 8.7 23.8 0.0395 4.2 ------ UNKNOWN
8.3272 -70.8473 2.5 21.2 -102.0 0.0521 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
58.904590 836.504620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5294 -60.6066 6.4 53.4 13.0 4.7473 1.8 6.4 Cen X-3
186.6576 -62.8815 4.9 46.3 17.6 3.4227 2.3 6.7 GX 301-2
255.9598 -37.8425 0.8 24.9 98.8 13.5304 14.3 1.3 4U 1700-377
256.4871 -36.6004 4.4 25.6 101.4 -2.7227 -2.6 10.9 GX 349+2
263.0018 -24.7288 81.3 33.2 123.4 0.1856 0.1 1.1 GX 1+4
264.8364 -44.4072 6.7 15.6 100.6 1.1786 1.7 4.8 4U 1735-44
270.3372 -25.2573 0.0 30.6 135.0 2.2305 2.2 11.1 GX 5-1
270.4024 -25.7804 5.3 30.1 134.9 2.2066 2.2 5.8 GRS 1758-258
273.8748 -14.0202 3.9 41.0 144.5 5.8329 3.0 7.7 GX 17+2
275.9858 -30.4683 2.7 24.4 143.1 3.2102 4.2 6.8 H1820-303
284.9477 -24.7683 5.6 29.6 161.6 1.7677 2.0 10.3 HT1900.1-2455
262.9936 -33.8316 53.8 25.0 115.4 0.1885 0.2 0.3 GX 354-0
250.3512 -53.9766 4.0 19.2 56.2 1.9760 2.9 ------ UNKNOWN
261.2157 -75.3598 4.2 22.7 -6.9 1.8803 2.8 ------ UNKNOWN
316.8314 -1.3767 4.5 59.6 -161.6 17.5692 2.6 ------ UNKNOWN
318.3351 -2.8770 4.3 58.7 -159.3 15.5179 2.7 ------ UNKNOWN
28.8530 -66.4081 3.6 47.0 -53.1 13.5089 3.2 ------ UNKNOWN
333.8151 -23.2566 3.4 48.5 -130.3 12.7065 3.4 ------ UNKNOWN
339.3170 -33.4424 3.4 43.9 -116.1 13.4095 3.4 ------ UNKNOWN
347.1049 -44.1975 5.6 41.3 -98.2 10.1865 2.1 ------ UNKNOWN
Plot creation:
Sat May 30 16:51:32 EDT 2015