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
336.6496 5.0273 0.0053 45.5732 -169.4404 5.8297083 36.063 TRIG_00100970
Foreground time interval of the image:
-2.736 70.700 (delta_t = 73.436 [sec])
Background time interval of the image:
-299.472 -2.736 (delta_t = 296.736 [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)
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 -2.736 sec. to 70.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58832 ( -0.0787535 0.0787919 )
Norm@50keV : 5.17769E-03 ( -0.000214594 0.000214501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.553776e-01
Photon flux (15-150 keV) in 73.44 sec: 0.662972 ( -0.0306428 0.0307748 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5613e-06 ( -1.5401e-07 1.54489e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.736 sec. to 70.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58591 ( -0.146139 0.0794957 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 5.18325E-03 ( -0.000214989 0.000981791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.63 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 56 degrees of freedom
# Null hypothesis probability = 2.257267e-01
Photon flux (15-150 keV) in 73.44 sec: 0.664332 ( -0.03238 0.029253 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55956e-06 ( -1.51903e-07 1.51734e-07 ) ergs/cm2
Band function
Time interval is from -2.736 sec. to 70.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34810 ( 1.3481 1.3481 )
beta : -1.58832 ( -0.0788114 0.0786222 )
Epeak [keV] : 16.1530 ( -16.153 -16.153 )
Norm@50keV : 1.09773E-02 ( -0.0044572 13.7315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 1.994575e-01
Photon flux (15-150 keV) in 73.44 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] : 16.2183 ( )
R^2/D10^2 : 5.34807E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 233.75 using 59 PHA bins.
# Reduced chi-squared = 4.1009 for 57 degrees of freedom
# Null hypothesis probability = 2.884749e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.129e-07 1.865e-08
25- 50 9.065e-07 5.655e-08
50-150 1.675e-06 1.175e-07
15-150 2.794e-06 1.329e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.66278 (-0.110331 0.110284)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.52 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.076610e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.871e-07 2.379e-08
25- 50 9.371e-07 4.517e-08
50-150 2.055e-06 1.002e-07
15-150 3.479e-06 1.774e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.90469 (-0.995375 1.1186)
R1^2/D10^2 : 0.784690 (-0.322296 0.628239)
kT2 [keV] : 28.8527 (-3.97049 6.09789)
R2^2/D10^2 : 5.77986E-03 (-0.00276498 0.0040536)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.19 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 55 degrees of freedom
# Null hypothesis probability = 4.331439e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.916e-07 7.612e-08
25- 50 9.236e-07 8.886e-08
50-150 2.140e-06 2.655e-07
15-150 3.555e-06 3.331e-07
Peak spectrum fit
Power-law model
Time interval is from 22.028 sec. to 23.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70232 ( -0.25856 0.267409 )
Norm@50keV : 1.21977E-02 ( -0.00187253 0.00184137 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8433 for 57 degrees of freedom
# Null hypothesis probability = 7.942636e-01
Photon flux (15-150 keV) in 1 sec: 1.62131 ( -0.243215 0.244423 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12916e-07 ( -1.79312e-08 1.80613e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 22.028 sec. to 23.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70601 ( -0.265039 0.264275 )
Epeak [keV] : 9999.30 ( -9999.34 -9999.35 )
Norm@50keV : 1.21824E-02 ( -0.00187318 0.015215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8584 for 56 degrees of freedom
# Null hypothesis probability = 7.654008e-01
Photon flux (15-150 keV) in 1 sec: 1.62360 ( -0.24694 0.24206 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12651e-07 ( -1.76999e-08 1.8193e-08 ) ergs/cm2
Band function
Time interval is from 22.028 sec. to 23.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93898 ( -4.93898 -4.93898 )
beta : -1.75740 ( -0.306977 0.278287 )
Epeak [keV] : 21.6814 ( -21.6814 5.22422 )
Norm@50keV : 3403.91 ( -489.439 1.05737e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.38 using 59 PHA bins.
# Reduced chi-squared = 0.8615 for 55 degrees of freedom
# Null hypothesis probability = 7.574943e-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] : 15.3725 (-3.07893 3.72176)
R^2/D10^2 : 0.155848 (-0.0838668 0.191884)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 57 degrees of freedom
# Null hypothesis probability = 1.271258e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.678e-09 2.539e-09
25- 50 3.119e-08 8.020e-09
50-150 5.070e-08 1.582e-08
15-150 8.958e-08 2.067e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 156.656 (-72.7498 -156.35)
Norm : 6.58505 (-1.06685 1.42186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.34 using 59 PHA bins.
# Reduced chi-squared = 0.8655 for 57 degrees of freedom
# Null hypothesis probability = 7.547574e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.685e-08 9.565e-09
25- 50 3.142e-08 1.693e-08
50-150 6.313e-08 3.675e-08
15-150 1.114e-07 6.280e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.85183 (-1.21467 1.72755)
R1^2/D10^2 : 8.81468 (-6.3854 24.5731)
kT2 [keV] : 24.5438 (-5.76895 10.2899)
R2^2/D10^2 : 2.49816E-02 (-0.017278 0.0281494)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.92 using 59 PHA bins.
# Reduced chi-squared = 0.8167 for 55 degrees of freedom
# Null hypothesis probability = 8.321000e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.162e-08 1.146e-08
25- 50 2.633e-08 1.076e-08
50-150 6.683e-08 3.832e-08
15-150 1.148e-07 4.814e-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: 1.58832 ( -0.0787535 0.0787919 )
Norm@50keV : 5.17769E-03 ( -0.000214594 0.000214501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.553776e-01
Photon flux (15-150 keV) in 73.44 sec: 0.662972 ( -0.0306428 0.0307748 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5613e-06 ( -1.5401e-07 1.54489e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58591 ( -0.146139 0.0794957 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 5.18325E-03 ( -0.000214989 0.000981791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.63 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 56 degrees of freedom
# Null hypothesis probability = 2.257267e-01
Photon flux (15-150 keV) in 73.44 sec: 0.664332 ( -0.03238 0.029253 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55956e-06 ( -1.51903e-07 1.51734e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34810 ( 1.3481 1.3481 )
beta : -1.58832 ( -0.0788114 0.0786222 )
Epeak [keV] : 16.1530 ( -16.153 -16.153 )
Norm@50keV : 1.09773E-02 ( -0.00601352 1342.43 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 1.994575e-01
Photon flux (15-150 keV) in 73.44 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) = 9.18e-07
S(50-100 keV) = 1.22e-06
T90 vs. Hardness ratio plot
T90 = 56.3000000119209 sec.
Hardness ratio (energy fluence ratio) = 1.32898
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.27586
Count Ratio (50-100 keV) / (15-25 keV) = 1.01021
Mask shadow pattern
IMX = -1.002932845507641E+00, IMY = 1.869627766153752E-01
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:
-299.472000 -2.736000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4278 35.3371 1.1 36.5 -8.5 2.4872 10.6 1.5 Her X-1
288.9045 11.0692 4.7 26.0 -87.7 0.6259 2.5 9.7 GRS 1915+105
299.5891 35.2019 0.3 0.0 -173.6 7.3392 42.1 0.1 Cyg X-1
308.0488 40.9555 1.2 8.8 114.4 1.7059 9.5 2.8 Cyg X-3
326.0411 38.4291 5.3 21.4 141.3 0.4447 2.2 8.9 Cyg X-2
352.5816 53.7612 2.7 40.9 113.9 3.0892 4.4 ------ UNKNOWN
238.8738 55.2426 2.8 45.4 23.5 1.7006 4.2 ------ UNKNOWN
245.1100 27.6905 2.5 46.5 -15.6 1.5248 4.6 ------ UNKNOWN
269.1387 11.9819 2.3 36.0 -54.8 1.4170 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.736000 70.700000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2945 35.2148 4.0 36.7 -8.7 -0.3577 -2.9 11.1 Her X-1
288.9571 10.9910 24.3 26.1 -87.9 -0.0578 -0.5 9.7 GRS 1915+105
299.5671 35.1501 4.4 0.1 -99.2 0.2265 2.6 3.3 Cyg X-1
308.1317 40.9570 1040.3 8.8 114.7 0.0010 0.0 1.0 Cyg X-3
326.1161 38.5089 7.5 21.4 141.0 -0.1539 -1.5 11.5 Cyg X-2
336.3077 44.5708 2.1 29.4 128.0 0.7199 5.5 ------ UNKNOWN
312.9670 36.3946 2.6 10.9 147.6 0.3862 4.4 ------ UNKNOWN
333.6013 20.8822 2.6 33.0 174.3 0.4952 4.5 ------ UNKNOWN
342.9183 6.1677 2.0 49.2 -176.5 1.1387 5.7 ------ UNKNOWN
336.6496 5.0273 0.3 45.6 -169.4 5.8294 36.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
-299.472000 302.601300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4364 35.3609 1.0 36.5 -8.5 4.5508 11.0 1.5 Her X-1
288.9138 11.0663 3.9 26.0 -87.7 1.2570 3.0 9.9 GRS 1915+105
299.5888 35.2001 0.2 0.0 -159.7 15.4375 52.4 0.1 Cyg X-1
308.0990 40.9499 0.9 8.8 114.6 3.6541 12.2 0.5 Cyg X-3
326.1398 38.3613 3.7 21.4 141.4 1.0158 3.1 2.8 Cyg X-2
276.2867 65.5462 2.7 33.3 50.4 2.0204 4.3 ------ UNKNOWN
308.1311 37.6061 1.9 7.3 136.0 1.8487 6.1 ------ UNKNOWN
344.6697 11.2783 2.7 47.3 176.8 2.7520 4.2 ------ UNKNOWN
336.6689 5.0418 0.9 45.6 -169.5 6.7335 12.6 ------ UNKNOWN
288.5513 9.8278 2.0 27.3 -87.9 2.5169 5.7 ------ UNKNOWN
269.1397 11.9665 2.4 36.0 -54.8 2.4347 4.8 ------ UNKNOWN
Plot creation:
Sun May 31 17:46:18 EDT 2015