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
208.4233 -18.5771 0.0225 16.9168 -141.6893 0.2136885 8.521 TRIG_00318094
Foreground time interval of the image:
-0.140 5.188 (delta_t = 5.328 [sec])
Background time interval of the image:
-239.336 -0.140 (delta_t = 239.196 [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 5.504000
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 5.504000
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 5.504000
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 -0.140 sec. to 5.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22300 ( -0.345114 0.339654 )
Norm@50keV : 2.49201E-03 ( -0.000456656 0.00045662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.98 using 59 PHA bins.
# Reduced chi-squared = 0.7189 for 57 degrees of freedom
# Null hypothesis probability = 9.458259e-01
Photon flux (15-150 keV) in 5.328 sec: 0.293493 ( -0.0554264 0.0557526 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33846e-07 ( -2.72975e-08 2.78519e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.140 sec. to 5.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.756967 ( -1.62194 1.80072 )
Epeak [keV] : 147.682 ( -147.513 -147.513 )
Norm@50keV : 4.06060E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7246 for 56 degrees of freedom
# Null hypothesis probability = 9.398132e-01
Photon flux (15-150 keV) in 5.328 sec: 0.285357 ( -0.05962 0.059341 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29746e-07 ( -2.96999e-08 2.98618e-08 ) ergs/cm2
Band function
Time interval is from -0.140 sec. to 5.188 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.708191 ( -0.629213 1.57134 )
beta : -9.37057 ( 9.37146 19.3715 )
Epeak [keV] : 138.356 ( -65.1226 -138.584 )
Norm@50keV : 4.28033E-03 ( -0.00218977 0.00491108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7378 for 55 degrees of freedom
# Null hypothesis probability = 9.267995e-01
Photon flux (15-150 keV) in 5.328 sec: 0.290600 0.285436 ( ) 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] : 19.7797 (-4.38548 5.94335)
R^2/D10^2 : 1.37645E-02 (-0.00781737 0.0175209)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.74 using 59 PHA bins.
# Reduced chi-squared = 0.7849 for 57 degrees of freedom
# Null hypothesis probability = 8.808438e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.555e-09 2.211e-09
25- 50 2.747e-08 9.321e-09
50-150 7.954e-08 3.140e-08
15-150 1.126e-07 3.330e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.21655 (-0.22639 0.226367)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.37 using 59 PHA bins.
# Reduced chi-squared = 0.7609 for 57 degrees of freedom
# Null hypothesis probability = 9.085217e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.615e-08 9.388e-09
25- 50 3.106e-08 1.786e-08
50-150 6.812e-08 3.967e-08
15-150 1.153e-07 6.604e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.96517 (-3.35839 6.06876)
R1^2/D10^2 : 0.394220 (-0.360514 1.92232)
kT2 [keV] : 25.9756 (-7.44387 21.7587)
R2^2/D10^2 : 5.07545E-03 (-0.0043836 0.0109078)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.52 using 59 PHA bins.
# Reduced chi-squared = 0.7186 for 55 degrees of freedom
# Null hypothesis probability = 9.426590e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.295e-08 7.539e-09
25- 50 2.765e-08 1.415e-08
50-150 9.012e-08 5.243e-08
15-150 1.307e-07 7.049e-08
Peak spectrum fit
Power-law model
Time interval is from 1.204 sec. to 2.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.17216 ( )
Norm@50keV : 1.47153E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8187 for 57 degrees of freedom
# Null hypothesis probability = 8.339553e-01
Photon flux (15-150 keV) in 1 sec: 0.307596 7.43284E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84173e-08 ( -1.30873e-08 1.29634e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.204 sec. to 2.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.17477 ( )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 4.55380E-05 ( -4.55376e-05 0.000252977 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.63 using 59 PHA bins.
# Reduced chi-squared = 0.8326 for 56 degrees of freedom
# Null hypothesis probability = 8.096421e-01
Photon flux (15-150 keV) in 1 sec: 0.316607 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77589e-08 ( -1.2607e-08 1.30432e-08 ) ergs/cm2
Band function
Time interval is from 1.204 sec. to 2.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.757815 ( 0.755699 0.755699 )
beta : -0.208852 ( -0.951847 0.201717 )
Epeak [keV] : 11.3553 ( -11.3296 -11.3296 )
Norm@50keV : 4.17480E-03 ( -0.00416891 150472 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.01 using 59 PHA bins.
# Reduced chi-squared = 0.8730 for 55 degrees of freedom
# Null hypothesis probability = 7.364409e-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] : 87.7048 (-87.908 -87.908)
R^2/D10^2 : 4.72208E-04 (-0.000469992 0.0036865)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.25 using 59 PHA bins.
# Reduced chi-squared = 0.8641 for 57 degrees of freedom
# Null hypothesis probability = 7.574941e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.483e-10 1.739e-10
25- 50 1.974e-09 1.380e-09
50-150 3.632e-08 3.089e-08
15-150 3.854e-08 2.786e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-106.702 -199.363)
Norm : 1.36365 (-0.519809 0.519774)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.39 using 59 PHA bins.
# Reduced chi-squared = 0.9543 for 57 degrees of freedom
# Null hypothesis probability = 5.734816e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.396e-09 2.227e-09
25- 50 6.532e-09 4.257e-09
50-150 1.433e-08 8.790e-09
15-150 2.425e-08 1.573e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50518 (-3.10078 7.10838)
R1^2/D10^2 : 0.465157 (-0.448845 7.02031)
kT2 [keV] : 196.110 (-138.586 -196.345)
R2^2/D10^2 : 1.29753E-04 (-4.91178e-05 0.00160129)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.43 using 59 PHA bins.
# Reduced chi-squared = 0.8078 for 55 degrees of freedom
# Null hypothesis probability = 8.452856e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.075e-09 2.069e-09
25- 50 4.830e-09 2.483e-09
50-150 3.405e-08 1.145e-08
15-150 4.196e-08 1.157e-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: 1.22300 ( -0.345114 0.339654 )
Norm@50keV : 2.49201E-03 ( -0.000456656 0.00045662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.98 using 59 PHA bins.
# Reduced chi-squared = 0.7189 for 57 degrees of freedom
# Null hypothesis probability = 9.458259e-01
Photon flux (15-150 keV) in 5.328 sec: 0.293493 ( -0.0554264 0.0557526 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33846e-07 ( -2.72975e-08 2.78519e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.756967 ( -1.62194 1.80072 )
Epeak [keV] : 147.682 ( -147.513 -147.513 )
Norm@50keV : 4.06060E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7246 for 56 degrees of freedom
# Null hypothesis probability = 9.398132e-01
Photon flux (15-150 keV) in 5.328 sec: 0.285357 ( -0.05962 0.059444 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29746e-07 ( -2.96999e-08 2.98618e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.708191 ( -0.629213 1.57134 )
beta : -9.37057 ( 9.37146 19.3715 )
Epeak [keV] : 138.356 ( -65.1226 -138.584 )
Norm@50keV : 4.28033E-03 ( -0.00218977 0.00491108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7378 for 55 degrees of freedom
# Null hypothesis probability = 9.267995e-01
Photon flux (15-150 keV) in 5.328 sec: 0.290600 0.285436 ( ) 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) = 2.85e-08
S(50-100 keV) = 4.88e-08
T90 vs. Hardness ratio plot
T90 = 4.91200000047684 sec.
Hardness ratio (energy fluence ratio) = 1.71228
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.44181
Count Ratio (50-100 keV) / (15-25 keV) = 1.39451
Mask shadow pattern
IMX = -2.386495244269264E-01, IMY = 1.885466209781005E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 5.504000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 5.504000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 5.504000
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:
-239.336000 -0.140000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9833 -15.6420 0.2 20.3 77.8 23.7871 66.8 0.2 Sco X-1
254.3380 35.3462 23.1 54.9 4.0 -0.6104 -0.5 5.9 Her X-1
255.9437 -37.8726 2.0 38.4 112.7 5.0676 5.6 2.7 4U 1700-377
256.5756 -36.5607 0.0 38.1 110.4 1.2752 1.4 10.7 GX 349+2
263.1323 -24.6520 20.5 38.8 89.2 0.7017 0.6 8.8 GX 1+4
267.2581 1.8295 2.3 44.6 49.4 6.1946 5.1 ------ UNKNOWN
166.5453 -42.9194 3.6 58.7 -159.2 7.5156 3.2 ------ UNKNOWN
206.5114 36.1345 3.5 50.7 -44.5 5.8295 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.140000 5.188000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0488 -15.8183 6.7 20.4 78.2 -0.0516 -1.7 11.4 Sco X-1
254.5331 35.3191 3.2 55.0 4.2 0.4097 3.6 4.0 Her X-1
255.8189 -37.7784 9.7 38.3 112.6 -0.0937 -1.2 8.9 4U 1700-377
256.6187 -36.3430 4.8 38.0 110.1 0.1950 2.4 10.1 GX 349+2
263.0660 -24.8774 101.5 38.8 89.6 0.0116 0.1 8.5 GX 1+4
255.6234 27.9158 2.9 49.8 11.0 0.2709 4.0 ------ UNKNOWN
208.4233 -18.5771 1.3 16.9 -141.7 0.2136 8.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
92.764600 962.725600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1405 -60.5719 6.4 50.0 -177.2 3.0650 1.8 6.0 Cen X-3
186.6427 -62.8099 3.5 46.8 172.8 4.8836 3.3 2.4 GX 301-2
244.9752 -15.6364 0.3 35.0 70.4 65.1401 39.4 0.3 Sco X-1
201.3085 -43.0448 1.8 25.2 171.6 4.0928 6.5 ------ UNKNOWN
205.2890 32.6290 3.4 51.3 -24.0 4.4295 3.4 ------ UNKNOWN
187.5782 28.0079 4.2 50.7 -44.5 10.4676 2.8 ------ UNKNOWN
167.8930 -6.6301 4.6 41.2 -99.2 10.4106 2.5 ------ UNKNOWN
Plot creation:
Sun May 31 06:53:36 EDT 2015