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
226.5815 12.4092 0.0103 23.1248 -85.8716 4.0107209 18.691 TRIG_00332399
Foreground time interval of the image:
-4.928 213.820 (delta_t = 218.748 [sec])
Background time interval of the image:
-239.000 -4.928 (delta_t = 234.072 [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 64.000000
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 64.000000
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 64.000000
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 -4.928 sec. to 213.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61526 ( -0.1118 0.11299 )
Norm@50keV : 1.26644E-03 ( -8.18131e-05 8.13239e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8262 for 57 degrees of freedom
# Null hypothesis probability = 8.224058e-01
Photon flux (15-150 keV) in 218.7 sec: 0.163522 ( -0.0102136 0.0102271 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58558e-06 ( -1.79448e-07 1.80908e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.928 sec. to 213.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30649 ( -0.494013 0.361636 )
Epeak [keV] : 108.297 ( -40.1691 -108.298 )
Norm@50keV : 1.82965E-03 ( -0.00061789 0.00142592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.70 using 59 PHA bins.
# Reduced chi-squared = 0.8161 for 56 degrees of freedom
# Null hypothesis probability = 8.354259e-01
Photon flux (15-150 keV) in 218.7 sec: 0.160760 ( -0.010978 0.010924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51295e-06 ( -2.09077e-07 2.08858e-07 ) ergs/cm2
Band function
Time interval is from -4.928 sec. to 213.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13761 ( 1.14203 6.02342 )
beta : -1.89985 ( 1.89757 0.346544 )
Epeak [keV] : 82.1152 ( -82.1399 -82.1399 )
Norm@50keV : 2.27669E-03 ( -0.00106801 0.0578829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.27 using 59 PHA bins.
# Reduced chi-squared = 0.8231 for 55 degrees of freedom
# Null hypothesis probability = 8.222793e-01
Photon flux (15-150 keV) in 218.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5096e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6712 (-1.02006 1.12464)
R^2/D10^2 : 2.46738E-02 (-0.00609172 0.0079768)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.70 using 59 PHA bins.
# Reduced chi-squared = 1.696 for 57 degrees of freedom
# Null hypothesis probability = 8.070619e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.135e-07 2.416e-08
25- 50 7.751e-07 6.277e-08
50-150 9.421e-07 1.198e-07
15-150 1.931e-06 1.410e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 164.860 (-44.6227 -165.129)
Norm : 0.666700 (-0.0453043 0.0510536)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.71 using 59 PHA bins.
# Reduced chi-squared = 0.8019 for 57 degrees of freedom
# Null hypothesis probability = 8.583395e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.712e-07 3.095e-08
25- 50 6.972e-07 1.590e-07
50-150 1.429e-06 5.687e-07
15-150 2.498e-06 6.996e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.83320 (-1.68031 2.61874)
R1^2/D10^2 : 0.304935 (-0.206481 0.544247)
kT2 [keV] : 20.7474 (-3.71357 10.4867)
R2^2/D10^2 : 4.52981E-03 (-0.00352447 0.00527746)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.09 using 59 PHA bins.
# Reduced chi-squared = 0.9288 for 55 degrees of freedom
# Null hypothesis probability = 6.249474e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.702e-07 1.544e-07
25- 50 6.842e-07 1.651e-07
50-150 1.346e-06 3.493e-07
15-150 2.400e-06 5.104e-07
Peak spectrum fit
Power-law model
Time interval is from 57.176 sec. to 58.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64854 ( -0.456172 0.492075 )
Norm@50keV : 4.66442E-03 ( -0.00134078 0.00125408 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.39 using 59 PHA bins.
# Reduced chi-squared = 0.8490 for 57 degrees of freedom
# Null hypothesis probability = 7.844843e-01
Photon flux (15-150 keV) in 1 sec: 0.608763 ( -0.146441 0.146471 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.33866e-08 ( -1.27389e-08 1.32042e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 57.176 sec. to 58.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.30647 ( )
Epeak [keV] : 111.119 ( )
Norm@50keV : 2.11222E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.03 using 59 PHA bins.
# Reduced chi-squared = 0.8576 for 56 degrees of freedom
# Null hypothesis probability = 7.668424e-01
Photon flux (15-150 keV) in 1 sec: 0.608810 ( -0.146241 0.146176 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.33024e-08 ( -6.3375e-09 1.29454e-08 ) ergs/cm2
Band function
Time interval is from 57.176 sec. to 58.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.89221 ( 0.461612 0.461612 )
beta : -1.69349 ( 1.66811 0.471579 )
Epeak [keV] : 20.4725 ( -26.454 447.335 )
Norm@50keV : 246.075 ( -245.847 934733 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8773 for 55 degrees of freedom
# Null hypothesis probability = 7.282345e-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] : 11.2170 (-4.55052 9.15111)
R^2/D10^2 : 0.176804 (-0.148779 1.00728)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.27 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.284424e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.665e-09 2.900e-09
25- 50 1.352e-08 6.784e-09
50-150 9.754e-09 6.791e-09
15-150 2.794e-08 1.666e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 176.677 (-122.141 -178.752)
Norm : 2.45932 (-0.606985 0.923804)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.18 using 59 PHA bins.
# Reduced chi-squared = 0.8628 for 57 degrees of freedom
# Null hypothesis probability = 7.597928e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.215e-09 3.791e-09
25- 50 1.178e-08 6.735e-09
50-150 2.478e-08 1.482e-08
15-150 4.277e-08 2.559e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.31514 (-1.85218 3.19558)
R1^2/D10^2 : 2.38194 (-1.95977 13.1953)
kT2 [keV] : 33.2917 (-15.1025 111.332)
R2^2/D10^2 : 3.80263E-03 (-0.0036416 0.0225634)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.57 using 59 PHA bins.
# Reduced chi-squared = 0.8468 for 55 degrees of freedom
# Null hypothesis probability = 7.835777e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.969e-09 4.868e-09
25- 50 9.529e-09 5.155e-09
50-150 2.988e-08 1.817e-08
15-150 4.737e-08 2.568e-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: 1.61526 ( -0.1118 0.11299 )
Norm@50keV : 1.26644E-03 ( -8.18131e-05 8.13239e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8262 for 57 degrees of freedom
# Null hypothesis probability = 8.224058e-01
Photon flux (15-150 keV) in 218.7 sec: 0.163522 ( -0.0102136 0.0102271 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58558e-06 ( -1.79448e-07 1.80908e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30649 ( -0.494013 0.361636 )
Epeak [keV] : 108.297 ( -40.1691 -108.298 )
Norm@50keV : 1.82965E-03 ( -0.00061789 0.00142592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.70 using 59 PHA bins.
# Reduced chi-squared = 0.8161 for 56 degrees of freedom
# Null hypothesis probability = 8.354259e-01
Photon flux (15-150 keV) in 218.7 sec: 0.160760 ( -0.010978 0.010924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51295e-06 ( -2.09077e-07 2.08858e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13761 ( 1.14203 6.02342 )
beta : -1.89985 ( 1.89757 0.346544 )
Epeak [keV] : 82.1152 ( -82.1399 -82.1399 )
Norm@50keV : 2.27669E-03 ( -0.00106564 0.0512229 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.27 using 59 PHA bins.
# Reduced chi-squared = 0.8231 for 55 degrees of freedom
# Null hypothesis probability = 8.222793e-01
Photon flux (15-150 keV) in 218.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5096e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.75e-07
S(50-100 keV) = 8.81e-07
T90 vs. Hardness ratio plot
T90 = 157.580000013113 sec.
Hardness ratio (energy fluence ratio) = 1.30519
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.26803
Count Ratio (50-100 keV) / (15-25 keV) = 0.875418
Mask shadow pattern
IMX = 3.074378814217653E-02, IMY = 4.259403152872967E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-239.000000 -4.928000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4365 35.3311 0.8 13.3 137.0 2.4235 14.4 1.2 Her X-1
268.3318 -1.5032 2.7 44.2 -162.5 1.3661 4.3 3.7 SW J1753.5-0127
274.1685 -13.9936 8.1 57.7 -159.1 -1.6262 -1.4 9.8 GX 17+2
288.7442 10.8634 70.3 50.8 166.3 -0.0989 -0.2 5.9 GRS 1915+105
284.7051 21.8525 2.1 42.0 155.7 1.9466 5.4 ------ UNKNOWN
270.6245 11.5894 2.2 36.1 -178.9 1.1152 5.2 ------ UNKNOWN
189.8893 20.0957 3.3 45.1 -30.9 1.0917 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.928000 213.820000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2635 35.3752 9.6 13.2 136.7 -0.2186 -1.2 9.7 Her X-1
268.3361 -1.4648 7.4 44.2 -162.5 -0.5018 -1.5 2.0 SW J1753.5-0127
274.0313 -14.0164 7.7 57.7 -158.9 1.2994 1.5 1.9 GX 17+2
288.9270 10.9295 76.7 50.9 166.1 0.0910 0.1 7.6 GRS 1915+105
175.3205 64.6947 2.5 49.5 32.5 4.0203 4.6 ------ UNKNOWN
171.5065 63.3478 2.1 51.0 30.6 4.9131 5.4 ------ UNKNOWN
278.2835 -7.0579 1.7 54.8 -168.0 3.9482 6.9 ------ UNKNOWN
226.5815 12.4093 0.6 23.1 -85.9 4.0104 18.7 ------ UNKNOWN
191.9718 12.2390 2.4 47.3 -41.8 2.5460 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
387.200600 663.150000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9598 -15.6413 1.6 15.2 -124.5 6.6373 7.2 1.1 Sco X-1
254.3117 35.3435 5.9 40.3 8.7 2.5369 1.9 7.1 Her X-1
256.1691 -37.9051 7.8 32.9 -169.4 -1.4952 -1.5 9.4 4U 1700-377
256.5696 -36.3170 3.9 31.4 -170.0 2.8727 3.0 9.1 GX 349+2
263.1728 -24.8599 76.6 21.1 172.5 0.1356 0.2 11.3 GX 1+4
264.5339 -44.3370 7.0 40.1 -178.6 2.3245 1.7 11.2 4U 1735-44
268.2153 -1.4550 3.7 12.7 85.2 2.9489 3.1 9.2 SW J1753.5-0127
270.4344 -25.0524 4.6 24.4 157.8 -2.5066 -2.5 8.3 GX 5-1
270.2513 -25.7073 11.4 24.8 159.0 1.0471 1.0 3.5 GRS 1758-258
274.1200 -13.8552 0.0 19.9 128.6 -0.5582 -0.5 12.7 GX 17+2
275.8169 -30.5404 9.4 31.7 157.1 1.6433 1.2 11.8 H1820-303
285.0896 -24.9747 236.5 34.3 139.5 0.0824 0.0 4.4 HT1900.1-2455
288.7296 10.9669 5.8 36.3 74.7 5.4057 2.0 4.2 GRS 1915+105
262.9912 -33.8735 5.5 29.6 179.1 2.2347 2.1 2.3 GX 354-0
276.6422 -35.4850 2.8 36.0 161.6 5.8438 4.1 ------ UNKNOWN
245.9007 29.4777 3.3 35.8 -4.3 3.9302 3.5 ------ UNKNOWN
236.0319 47.4988 3.0 55.3 -5.4 11.6016 3.9 ------ UNKNOWN
215.7814 -16.8579 2.9 41.1 -99.2 14.6637 3.9 ------ UNKNOWN
Plot creation:
Sun May 31 05:47:45 EDT 2015