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
310.5730 54.0783 0.0090 8.1649 85.9306 0.6632414 21.438 TRIG_00118707
Foreground time interval of the image:
-6.260 6.784 (delta_t = 13.044 [sec])
Background time interval of the image:
-299.032 -6.260 (delta_t = 292.772 [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 -6.260 sec. to 6.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09007 ( -0.157794 0.165362 )
Norm@50keV : 2.79228E-03 ( -0.00029228 0.000286046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.81 using 59 PHA bins.
# Reduced chi-squared = 0.8914 for 57 degrees of freedom
# Null hypothesis probability = 7.051241e-01
Photon flux (15-150 keV) in 13.04 sec: 0.437157 ( -0.033703 0.0337268 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37982e-07 ( -3.14984e-08 3.21227e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.260 sec. to 6.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11290 ( -0.605687 0.0272499 )
Epeak [keV] : 210.628 ( )
Norm@50keV : 2.71040E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.9076 for 56 degrees of freedom
# Null hypothesis probability = 6.705781e-01
Photon flux (15-150 keV) in 13.04 sec: 0.436364 ( -0.036363 0.03426 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36442e-07 ( -3.8884e-08 3.32311e-08 ) ergs/cm2
Band function
Time interval is from -6.260 sec. to 6.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58828 ( 1.59037 1.59037 )
beta : -2.08920 ( 2.08952 0.157438 )
Epeak [keV] : 13.3759 ( -12.6831 -12.6831 )
Norm@50keV : 8.08752E-03 ( -0.00823603 0.410166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.81 using 59 PHA bins.
# Reduced chi-squared = 0.9239 for 55 degrees of freedom
# Null hypothesis probability = 6.351783e-01
Photon flux (15-150 keV) in 13.04 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] : 9.57621 (-0.924235 1.01433)
R^2/D10^2 : 0.227662 (-0.0733543 0.110079)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.69 using 59 PHA bins.
# Reduced chi-squared = 1.609 for 57 degrees of freedom
# Null hypothesis probability = 2.436495e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.455e-08 7.165e-09
25- 50 1.274e-07 1.104e-08
50-150 5.858e-08 1.251e-08
15-150 2.405e-07 2.341e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.0932 (-13.1771 19.0335)
Norm : 2.26627 (-0.30571 0.347179)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.04 using 59 PHA bins.
# Reduced chi-squared = 0.9481 for 57 degrees of freedom
# Null hypothesis probability = 5.868422e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.409e-08 7.648e-09
25- 50 1.122e-07 9.826e-09
50-150 1.261e-07 2.611e-08
15-150 3.124e-07 3.293e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.20428 (-1.06496 1.40305)
R1^2/D10^2 : 4.18243 (-2.84619 12.7887)
kT2 [keV] : 15.2022 (-2.76523 5.072)
R2^2/D10^2 : 3.02037E-02 (-0.0208583 0.0394129)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9778 for 55 degrees of freedom
# Null hypothesis probability = 5.213875e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.183e-08 3.703e-08
25- 50 1.026e-07 3.137e-08
50-150 1.214e-07 4.428e-08
15-150 3.058e-07 9.636e-08
Peak spectrum fit
Power-law model
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08486 ( -0.250412 0.272455 )
Norm@50keV : 5.65023E-03 ( -0.00106696 0.00103645 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.99 using 59 PHA bins.
# Reduced chi-squared = 0.8419 for 57 degrees of freedom
# Null hypothesis probability = 7.966221e-01
Photon flux (15-150 keV) in 1 sec: 0.882340 ( -0.117489 0.117492 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24223e-08 ( -8.77607e-09 9.08647e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68479 ( -1.13446 0.713494 )
Epeak [keV] : 30.9628 ( -20.5025 -30.9595 )
Norm@50keV : 9.86543E-03 ( -0.00538373 0.0394293 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.44 using 59 PHA bins.
# Reduced chi-squared = 0.8472 for 56 degrees of freedom
# Null hypothesis probability = 7.852696e-01
Photon flux (15-150 keV) in 1 sec: 0.871544 ( -0.119557 0.119778 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.00893e-08 ( -9.8473e-09 1.04501e-08 ) ergs/cm2
Band function
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95953 ( -4.95953 -4.95953 )
beta : -2.21868 ( -0.383993 0.299352 )
Epeak [keV] : 20.4695 ( -20.4695 4.57972 )
Norm@50keV : 3553.49 ( -470.338 8.77316e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.26 using 59 PHA bins.
# Reduced chi-squared = 0.8410 for 55 degrees of freedom
# Null hypothesis probability = 7.933193e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.12542e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.39793 (-1.40833 1.75064)
R^2/D10^2 : 0.788998 (-0.408919 0.838005)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.47 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.516239e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.041e-08 2.485e-09
25- 50 1.978e-08 3.995e-09
50-150 6.078e-09 2.613e-09
15-150 3.627e-08 7.155e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.5159 (-18.5828 33.6675)
Norm : 4.80350 (-1.01758 1.34101)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.77 using 59 PHA bins.
# Reduced chi-squared = 0.8381 for 57 degrees of freedom
# Null hypothesis probability = 8.030445e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.191e-08 2.026e-09
25- 50 1.768e-08 3.045e-09
50-150 1.883e-08 7.426e-09
15-150 4.842e-08 9.995e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.21039 (-1.4223 1.65225)
R1^2/D10^2 : 3.88497 (-2.50817 9.99506)
kT2 [keV] : 18.7031 (-5.91685 13.2764)
R2^2/D10^2 : 2.48262E-02 (-0.02154 0.0924808)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.92 using 59 PHA bins.
# Reduced chi-squared = 0.8349 for 55 degrees of freedom
# Null hypothesis probability = 8.034313e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.283e-08 6.753e-09
25- 50 1.619e-08 7.621e-09
50-150 2.132e-08 1.334e-08
15-150 5.033e-08 2.620e-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: 2.09007 ( -0.157794 0.165362 )
Norm@50keV : 2.79228E-03 ( -0.00029228 0.000286046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.81 using 59 PHA bins.
# Reduced chi-squared = 0.8914 for 57 degrees of freedom
# Null hypothesis probability = 7.051241e-01
Photon flux (15-150 keV) in 13.04 sec: 0.437157 ( -0.033703 0.0337268 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37982e-07 ( -3.14984e-08 3.21227e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11290 ( -0.605687 0.0371378 )
Epeak [keV] : 210.628 ( )
Norm@50keV : 2.71040E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.9076 for 56 degrees of freedom
# Null hypothesis probability = 6.705781e-01
Photon flux (15-150 keV) in 13.04 sec: 0.436364 ( -0.036363 0.03426 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36442e-07 ( -3.8884e-08 3.32311e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58828 ( 1.59037 1.59037 )
beta : -2.08920 ( 2.08952 0.157438 )
Epeak [keV] : 13.3759 ( -12.6831 -12.6831 )
Norm@50keV : 8.08752E-03 ( -0.00823603 0.410171 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.81 using 59 PHA bins.
# Reduced chi-squared = 0.9239 for 55 degrees of freedom
# Null hypothesis probability = 6.351783e-01
Photon flux (15-150 keV) in 13.04 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) = 1.04e-07
S(50-100 keV) = 9.80e-08
T90 vs. Hardness ratio plot
T90 = 10.5079999864101 sec.
Hardness ratio (energy fluence ratio) = 0.942308
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.905929
Count Ratio (50-100 keV) / (15-25 keV) = 0.437506
Mask shadow pattern
IMX = 1.018196477192660E-02, IMY = -1.431157912779417E-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:
-299.032000 -6.260000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5932 35.1993 0.3 26.7 52.1 8.3375 33.2 0.2 Cyg X-1
308.1075 40.9515 0.9 18.3 44.8 2.5162 13.0 0.1 Cyg X-3
326.3132 38.4733 4.7 17.3 -2.7 0.5385 2.5 11.3 Cyg X-2
308.0940 37.6833 1.8 21.2 40.3 1.3122 6.4 ------ UNKNOWN
331.7566 65.5324 2.3 10.4 -161.1 0.9148 4.9 ------ UNKNOWN
121.1434 63.9090 3.3 59.0 -166.2 5.4571 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.260000 6.784000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.3855 35.2252 5.9 26.7 52.4 0.0831 1.9 10.1 Cyg X-1
308.1228 40.9478 284.2 18.3 44.8 -0.0014 -0.0 0.6 Cyg X-3
326.2207 38.2591 3.8 17.5 -2.4 0.0916 3.0 4.4 Cyg X-2
314.7745 33.9426 2.4 22.8 23.2 0.1585 4.8 ------ UNKNOWN
310.5731 54.0783 0.5 8.2 85.9 0.6632 21.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
38.668600 123.043200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.6947 11.0164 4.4 46.4 45.1 0.9966 2.6 7.4 GRS 1915+105
299.5916 35.1956 0.4 20.4 41.4 2.4741 28.5 0.4 Cyg X-1
308.1380 40.9846 1.3 13.2 23.0 0.7257 8.8 2.3 Cyg X-3
326.0859 38.2898 13.5 19.0 -25.4 0.0725 0.8 4.5 Cyg X-2
277.6394 54.4156 2.2 19.1 119.2 0.4839 5.2 ------ UNKNOWN
308.0495 37.6580 2.4 16.5 21.9 0.3965 4.8 ------ UNKNOWN
338.7310 62.8760 2.3 16.9 -117.8 0.4213 5.0 ------ UNKNOWN
126.0429 66.5020 2.9 59.4 -163.2 2.5790 4.0 ------ UNKNOWN
34.0792 58.1251 2.6 43.7 -115.9 1.5274 4.4 ------ UNKNOWN
38.8469 59.8452 2.4 44.8 -119.9 1.6249 4.9 ------ UNKNOWN
65.4207 64.9324 2.7 51.0 -135.6 2.0357 4.3 ------ UNKNOWN
Plot creation:
Sun May 31 16:49:20 EDT 2015