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
328.6763 -0.0961 0.0188 27.7288 99.2232 0.5730937 10.220 TRIG_00359530
Foreground time interval of the image:
-0.712 9.256 (delta_t = 9.968 [sec])
Background time interval of the image:
-239.488 -0.712 (delta_t = 238.776 [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 4.096000
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 4.096000
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 4.096000
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 -0.712 sec. to 9.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34833 ( -0.25807 0.254538 )
Norm@50keV : 3.75158E-03 ( -0.000560267 0.000558343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.47 using 59 PHA bins.
# Reduced chi-squared = 0.9732 for 57 degrees of freedom
# Null hypothesis probability = 5.326170e-01
Photon flux (15-150 keV) in 9.968 sec: 0.451801 ( -0.0677905 0.0679025 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65373e-07 ( -6.06549e-08 6.16039e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.712 sec. to 9.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14261 ( -1.0884 0.980806 )
Epeak [keV] : 202.588 ( -202.599 -202.599 )
Norm@50keV : 4.80702E-03 ( -0.00158614 0.0128517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 0.9879 for 56 degrees of freedom
# Null hypothesis probability = 5.004860e-01
Photon flux (15-150 keV) in 9.968 sec: 0.448273 ( -0.069589 0.069375 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58485e-07 ( -7.00142e-08 6.68883e-08 ) ergs/cm2
Band function
Time interval is from -0.712 sec. to 9.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92192 ( -14.1846 -4.92192 )
beta : -1.56098 ( -0.459443 0.326987 )
Epeak [keV] : 29.0278 ( -9.28891 15.2201 )
Norm@50keV : 133.641 ( -19.469 4697.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.70 using 59 PHA bins.
# Reduced chi-squared = 0.9581 for 55 degrees of freedom
# Null hypothesis probability = 5.631747e-01
Photon flux (15-150 keV) in 9.968 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] : 14.3745 (-2.74555 3.86618)
R^2/D10^2 : 6.00968E-02 (-0.0598544 0.0667856)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.02 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.934054e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.607e-08 8.209e-09
25- 50 9.951e-08 2.728e-08
50-150 1.372e-07 4.503e-08
15-150 2.628e-07 5.647e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.86451 (-0.276142 0.276127)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 0.9959 for 57 degrees of freedom
# Null hypothesis probability = 4.838335e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.628e-08 2.591e-08
25- 50 8.903e-08 5.024e-08
50-150 1.953e-07 1.104e-07
15-150 3.306e-07 1.876e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.02639 (-2.37802 1.452)
R1^2/D10^2 : 0.232937 (-0.137763 0.381336)
kT2 [keV] : 49.2838 (-24.142 -49.2837)
R2^2/D10^2 : 8.96979E-04 (-0.000848335 0.00589831)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.65 using 59 PHA bins.
# Reduced chi-squared = 0.9392 for 55 degrees of freedom
# Null hypothesis probability = 6.032255e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.929e-08 2.130e-08
25- 50 9.604e-08 5.043e-08
50-150 2.384e-07 1.310e-07
15-150 3.737e-07 1.906e-07
Peak spectrum fit
Power-law model
Time interval is from 2.264 sec. to 3.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37779 ( -0.36215 0.361166 )
Norm@50keV : 8.87545E-03 ( -0.00176857 0.0017582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.38 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.908985e-01
Photon flux (15-150 keV) in 1 sec: 1.07554 ( -0.216194 0.217091 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.61594e-08 ( -1.90261e-08 1.93899e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.264 sec. to 3.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22257 ( )
Epeak [keV] : 264.423 ( )
Norm@50keV : 1.05488E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.40 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 56 degrees of freedom
# Null hypothesis probability = 2.592636e-01
Photon flux (15-150 keV) in 1 sec: 1.07348 ( -0.224653 0.21835 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58109e-08 ( -2.00576e-08 1.96391e-08 ) ergs/cm2
Band function
Time interval is from 2.264 sec. to 3.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30580 ( 1.30624 0.46524 )
beta : -9.36908 ( 9.37138 19.3714 )
Epeak [keV] : 548.991 ( -478.945 -549.292 )
Norm@50keV : 9.56604E-03 ( -0.00242511 0.0250413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.37 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.305812e-01
Photon flux (15-150 keV) in 1 sec: 1.07130 ( ) 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] : 18.6828 (-4.94346 6.72292)
R^2/D10^2 : 5.77059E-02 (-0.0362901 0.103582)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.02 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.153665e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.983e-09 1.819e-09
25- 50 1.893e-08 7.767e-09
50-150 4.839e-08 2.129e-08
15-150 7.130e-08 2.829e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-92.1505 -199.363)
Norm : 4.43065 (-0.874114 0.87414)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.25 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.653997e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.103e-08 6.540e-09
25- 50 2.122e-08 1.242e-08
50-150 4.655e-08 2.690e-08
15-150 7.880e-08 4.448e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.17855 (-2.00655 3.5719)
R1^2/D10^2 : 3.38812 (-2.90814 26.3396)
kT2 [keV] : 26.5189 (-7.9365 18.6313)
R2^2/D10^2 : 1.62650E-02 (-0.0131344 0.0368041)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.69 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.783907e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.139e-08 6.510e-09
25- 50 1.797e-08 9.815e-09
50-150 5.830e-08 3.522e-08
15-150 8.766e-08 4.673e-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: 1.34833 ( -0.25807 0.254538 )
Norm@50keV : 3.75158E-03 ( -0.000560267 0.000558343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.47 using 59 PHA bins.
# Reduced chi-squared = 0.9732 for 57 degrees of freedom
# Null hypothesis probability = 5.326170e-01
Photon flux (15-150 keV) in 9.968 sec: 0.451801 ( -0.0677905 0.0679025 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65373e-07 ( -6.06549e-08 6.16039e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14261 ( -1.0884 0.980806 )
Epeak [keV] : 202.588 ( -202.599 -202.599 )
Norm@50keV : 4.80702E-03 ( -0.00158614 0.0128517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 0.9879 for 56 degrees of freedom
# Null hypothesis probability = 5.004860e-01
Photon flux (15-150 keV) in 9.968 sec: 0.448273 ( -0.069589 0.069375 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58485e-07 ( -7.00142e-08 6.68883e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92192 ( -14.2286 -4.92192 )
beta : -1.56098 ( -0.459443 0.326987 )
Epeak [keV] : 29.0278 ( -9.28891 15.2201 )
Norm@50keV : 133.641 ( -19.469 4697.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.70 using 59 PHA bins.
# Reduced chi-squared = 0.9581 for 55 degrees of freedom
# Null hypothesis probability = 5.631747e-01
Photon flux (15-150 keV) in 9.968 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) = 8.35e-08
S(50-100 keV) = 1.31e-07
T90 vs. Hardness ratio plot
T90 = 8.86799997091293 sec.
Hardness ratio (energy fluence ratio) = 1.56886
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.84307
Count Ratio (50-100 keV) / (15-25 keV) = 1.32569
Mask shadow pattern
IMX = -8.425224750239850E-02, IMY = -5.188565261520907E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.488000 -0.712000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8188 10.9283 3.2 49.8 158.4 2.6387 3.6 1.6 GRS 1915+105
299.5852 35.2092 0.3 35.2 -168.7 9.9282 37.8 0.5 Cyg X-1
308.1454 41.0078 1.7 29.9 -155.4 1.5713 6.9 3.7 Cyg X-3
326.2951 38.1648 2.9 16.6 -142.1 0.8410 4.1 11.1 Cyg X-2
304.4947 14.8024 2.4 34.3 154.3 1.4926 4.8 ------ UNKNOWN
316.8222 16.6847 2.2 22.7 147.1 1.1519 5.2 ------ UNKNOWN
29.0217 -2.2681 1.8 55.6 8.4 6.9384 6.6 ------ UNKNOWN
358.5518 45.0889 2.6 24.8 -70.3 1.1570 4.4 ------ UNKNOWN
271.9558 39.9135 3.4 57.0 -161.6 3.2372 3.4 ------ UNKNOWN
337.4745 54.8703 3.3 29.2 -106.1 1.0816 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.712000 9.256000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8202 10.8365 6.3 49.8 158.3 -0.2241 -1.8 6.7 GRS 1915+105
299.7834 35.1015 0.0 35.1 -168.8 -0.0322 -0.7 11.2 Cyg X-1
307.9183 40.8008 0.0 30.0 -155.9 0.0348 0.9 12.6 Cyg X-3
326.2550 38.4619 7.3 16.8 -141.5 -0.0538 -1.6 9.3 Cyg X-2
328.6763 -0.0961 1.1 27.7 99.2 0.5732 10.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
88.212590 193.412600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7087 11.1244 0.0 41.3 168.2 0.2470 1.2 12.0 GRS 1915+105
299.6475 35.2202 2.4 44.5 -153.4 0.9865 4.8 3.0 Cyg X-1
308.1586 40.9959 3.1 45.1 -140.8 0.9770 3.7 3.4 Cyg X-3
326.2099 38.3147 40.6 38.5 -122.0 0.0653 0.3 1.8 Cyg X-2
327.6882 -39.8954 2.5 39.8 62.3 1.6905 4.5 ------ UNKNOWN
284.7940 40.7833 2.5 57.0 -157.7 2.5284 4.7 ------ UNKNOWN
Plot creation:
Sun May 31 03:14:15 EDT 2015