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
276.9026 -50.9951 0.0139 32.8743 112.5663 0.9236257 13.862 TRIG_00230115
Foreground time interval of the image:
-0.920 9.028 (delta_t = 9.948 [sec])
Background time interval of the image:
-239.128 -0.920 (delta_t = 238.208 [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 -0.920 sec. to 9.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82596 ( -0.182925 0.187965 )
Norm@50keV : 5.90904E-03 ( -0.000687527 0.000678858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.10 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.802135e-02
Photon flux (15-150 keV) in 9.948 sec: 0.822592 ( -0.0891609 0.0893734 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40745e-07 ( -6.31054e-08 6.38197e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.920 sec. to 9.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.841135 ( -1.04808 0.84124 )
Epeak [keV] : 53.3427 ( -10.8901 48.6925 )
Norm@50keV : 2.01499E-02 ( -0.0201545 0.0529312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.00 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 56 degrees of freedom
# Null hypothesis probability = 4.583622e-02
Photon flux (15-150 keV) in 9.948 sec: 0.787258 ( -0.094568 0.094315 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98758e-07 ( -6.92371e-08 7.23508e-08 ) ergs/cm2
Band function
Time interval is from -0.920 sec. to 9.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.777332 ( -0.866149 0.740893 )
beta : -2.63394 ( 2.68202 0.79831 )
Epeak [keV] : 51.5359 ( -26.0905 24.9528 )
Norm@50keV : 2.21912E-02 ( -0.0120076 302.46 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.67 using 59 PHA bins.
# Reduced chi-squared = 1.358 for 55 degrees of freedom
# Null hypothesis probability = 3.995022e-02
Photon flux (15-150 keV) in 9.948 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02761e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1404 (-1.34039 1.51645)
R^2/D10^2 : 0.190269 (-0.0685929 0.10602)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.61 using 59 PHA bins.
# Reduced chi-squared = 1.502 for 57 degrees of freedom
# Null hypothesis probability = 8.435025e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.906e-08 1.177e-08
25- 50 1.884e-07 2.537e-08
50-150 1.683e-07 3.790e-08
15-150 4.157e-07 5.929e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 92.6394 (-27.2132 50.6668)
Norm : 3.71847 (-0.544969 0.659762)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.71 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 57 degrees of freedom
# Null hypothesis probability = 4.929255e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.659e-08 1.525e-08
25- 50 1.644e-07 2.139e-08
50-150 2.548e-07 1.129e-07
15-150 5.158e-07 1.180e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.67217 (-1.7093 3.47888)
R1^2/D10^2 : 3.31056 (-2.76924 12.66)
kT2 [keV] : 15.3957 (-2.64381 7.51005)
R2^2/D10^2 : 6.62267E-02 (-0.0555327 0.0788927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.81 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.902906e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.312e-08 4.685e-08
25- 50 1.657e-07 6.453e-08
50-150 2.170e-07 1.211e-07
15-150 4.758e-07 1.960e-07
Peak spectrum fit
Power-law model
Time interval is from -0.504 sec. to 0.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26196 ( -0.199393 0.196088 )
Norm@50keV : 1.94446E-02 ( -0.002356 0.00235403 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.62 using 59 PHA bins.
# Reduced chi-squared = 0.8178 for 57 degrees of freedom
# Null hypothesis probability = 8.352867e-01
Photon flux (15-150 keV) in 1 sec: 2.30433 ( -0.294691 0.296256 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93993e-07 ( -2.46101e-08 2.4705e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.504 sec. to 0.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.208305 ( -1.12828 0.891022 )
Epeak [keV] : 95.2380 ( -24.1723 188.448 )
Norm@50keV : 5.86717E-02 ( -0.0351319 0.121828 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.44 using 59 PHA bins.
# Reduced chi-squared = 0.7579 for 56 degrees of freedom
# Null hypothesis probability = 9.095274e-01
Photon flux (15-150 keV) in 1 sec: 2.20886 ( -0.30558 0.30734 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86177e-07 ( -2.6372e-08 2.6169e-08 ) ergs/cm2
Band function
Time interval is from -0.504 sec. to 0.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.08394E-02 ( -1.00486 4.95748 )
beta : -2.02377 ( 2.05072 0.761161 )
Epeak [keV] : 86.9428 ( -53.9428 156.125 )
Norm@50keV : 7.05724E-02 ( -0.0723774 145.504 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
# Reduced chi-squared = 0.7671 for 55 degrees of freedom
# Null hypothesis probability = 8.973689e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85699e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.7046 (-2.42888 2.89389)
R^2/D10^2 : 0.135588 (-0.0527 0.0823126)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.68 using 59 PHA bins.
# Reduced chi-squared = 0.8364 for 57 degrees of freedom
# Null hypothesis probability = 8.058331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.376e-09 2.249e-09
25- 50 4.460e-08 9.005e-09
50-150 1.143e-07 2.485e-08
15-150 1.683e-07 2.720e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 9.78972 (-1.19607 1.19593)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.15 using 59 PHA bins.
# Reduced chi-squared = 0.8974 for 57 degrees of freedom
# Null hypothesis probability = 6.931465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.437e-08 1.384e-08
25- 50 4.689e-08 2.588e-08
50-150 1.028e-07 5.595e-08
15-150 1.741e-07 9.580e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.61039 (-6.52753 -9.63317)
R1^2/D10^2 : 0.576046 (-0.424845 29.9556)
kT2 [keV] : 26.6846 (-23.6782 -26.7879)
R2^2/D10^2 : 3.09976E-02 (-0.0301646 0.106987)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.71 using 59 PHA bins.
# Reduced chi-squared = 0.7766 for 55 degrees of freedom
# Null hypothesis probability = 8.863499e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.438e-08 8.080e-09
25- 50 4.674e-08 2.390e-08
50-150 1.247e-07 6.550e-08
15-150 1.858e-07 9.415e-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: 1.82596 ( -0.182925 0.187965 )
Norm@50keV : 5.90904E-03 ( -0.000687527 0.000678858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.10 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.802135e-02
Photon flux (15-150 keV) in 9.948 sec: 0.822592 ( -0.0891609 0.0893734 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40745e-07 ( -6.31054e-08 6.38197e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.841135 ( -1.04808 0.84124 )
Epeak [keV] : 53.3427 ( -10.8901 48.6925 )
Norm@50keV : 2.01499E-02 ( -0.0201545 0.0529312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.00 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 56 degrees of freedom
# Null hypothesis probability = 4.583622e-02
Photon flux (15-150 keV) in 9.948 sec: 0.787258 ( -0.094568 0.094315 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98758e-07 ( -6.92371e-08 7.23508e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.777332 ( -0.866149 0.740893 )
beta : -2.63394 ( 2.68202 0.79831 )
Epeak [keV] : 51.5359 ( -26.0852 25.4823 )
Norm@50keV : 2.21912E-02 ( -0.0120076 302.46 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.67 using 59 PHA bins.
# Reduced chi-squared = 1.358 for 55 degrees of freedom
# Null hypothesis probability = 3.995022e-02
Photon flux (15-150 keV) in 9.948 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02761e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.54e-07
S(50-100 keV) = 1.73e-07
T90 vs. Hardness ratio plot
T90 = 9.00000002980232 sec.
Hardness ratio (energy fluence ratio) = 1.12338
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.05231
Count Ratio (50-100 keV) / (15-25 keV) = 0.660307
Mask shadow pattern
IMX = -2.480164407110524E-01, IMY = -5.968109589008466E-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:
-239.128000 -0.920000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3099 -60.6192 36.4 44.0 -155.2 0.1203 0.3 0.3 Cen X-3
187.0259 -62.7554 14.1 36.6 -160.5 0.2512 0.8 10.2 GX 301-2
244.9854 -15.6448 0.2 25.2 13.6 12.3633 58.4 0.4 Sco X-1
256.0048 -37.9199 3.9 17.9 81.0 0.6613 3.0 4.6 4U 1700-377
256.3832 -36.4666 5.3 18.5 76.6 0.4875 2.2 3.6 GX 349+2
263.0364 -24.8037 2.1 28.8 56.1 1.6586 5.4 3.8 GX 1+4
264.7820 -44.5496 3.9 24.3 100.4 0.8501 3.0 6.2 4U 1735-44
270.2896 -25.0748 7.2 34.1 63.7 0.6919 1.6 0.4 GX 5-1
270.4398 -25.6089 0.0 33.9 64.6 0.0871 0.2 10.9 GRS 1758-258
274.0979 -13.9172 25.8 43.7 53.0 0.3639 0.4 8.9 GX 17+2
275.7247 -30.2706 12.4 35.8 75.7 0.5144 0.9 11.9 H1820-303
263.0788 -33.7997 1.7 24.5 74.0 1.8723 6.7 4.9 GX 354-0
255.2433 -41.6467 1.7 17.1 93.2 1.4171 6.6 ------ UNKNOWN
217.8669 -27.5919 3.9 16.8 -67.8 0.6329 3.0 ------ UNKNOWN
230.7861 17.7967 2.6 56.4 -16.7 3.9752 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.920000 9.028000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4283 -60.4473 11.8 44.0 -155.0 -0.0508 -1.0 11.1 Cen X-3
186.5852 -62.6318 6.7 36.8 -160.2 0.0703 1.7 8.5 GX 301-2
245.1204 -15.6547 7.6 25.2 13.9 -0.0530 -1.5 8.2 Sco X-1
255.9375 -37.9868 8.1 17.9 81.1 -0.0551 -1.4 8.9 4U 1700-377
256.2470 -36.2790 0.0 18.5 75.9 -0.0293 -0.8 12.6 GX 349+2
263.1044 -24.7149 6.0 28.9 56.1 -0.0982 -1.9 5.5 GX 1+4
264.9299 -44.2996 6.9 24.4 99.7 0.0847 1.7 12.1 4U 1735-44
270.1121 -25.0327 4.2 33.9 63.4 0.2017 2.7 9.8 GX 5-1
270.1647 -25.8774 0.0 33.5 64.8 0.1075 1.5 11.0 GRS 1758-258
273.9946 -13.9101 3.7 43.6 52.9 -0.4567 -3.1 7.6 GX 17+2
275.9292 -30.2802 8.6 35.9 75.8 -0.1262 -1.3 5.2 H1820-303
262.8054 -33.7030 8.8 24.4 73.5 0.0602 1.3 12.1 GX 354-0
276.9027 -50.9952 0.8 32.9 112.6 0.9238 13.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
71.172600 962.940000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.9003 -62.6219 20.4 46.3 -133.4 -0.9654 -0.6 11.1 GX 301-2
244.9826 -15.6327 0.3 43.6 -40.3 40.2191 38.4 0.5 Sco X-1
256.1417 -38.0025 0.0 19.6 -49.2 0.4808 0.9 12.0 4U 1700-377
256.3927 -36.4136 2.3 20.7 -45.8 2.6399 5.0 2.1 GX 349+2
262.9556 -24.7851 2.0 28.3 -20.2 3.0484 5.9 3.8 GX 1+4
264.8623 -44.5397 3.8 10.3 -48.7 1.5248 3.0 7.4 4U 1735-44
268.3502 -1.5056 6.6 50.0 -4.0 1.9611 1.7 3.4 SW J1753.5-0127
270.2707 -25.1049 1.4 26.4 -6.4 4.4454 8.1 1.7 GX 5-1
270.2702 -25.7155 2.4 25.8 -6.6 2.5492 4.7 2.4 GRS 1758-258
274.0035 -13.9889 4.2 37.1 2.5 1.7436 2.8 2.9 GX 17+2
275.9462 -30.3701 1.8 20.6 4.9 3.2193 6.5 1.1 H1820-303
284.9121 -25.0301 4.7 26.7 23.5 1.2804 2.5 9.4 HT1900.1-2455
263.0033 -33.8527 1.3 19.9 -28.6 4.1285 8.8 1.3 GX 354-0
300.4530 -22.3823 3.1 34.0 48.6 2.9721 3.7 ------ UNKNOWN
286.8895 -10.6780 2.3 41.2 22.2 4.0132 4.9 ------ UNKNOWN
255.1552 -41.6185 1.0 17.6 -59.1 5.9830 11.5 ------ UNKNOWN
250.1844 -53.7774 1.8 16.4 -102.9 3.2508 6.4 ------ UNKNOWN
247.8439 -48.8228 1.7 18.7 -87.5 3.7117 6.7 ------ UNKNOWN
Plot creation:
Sun May 31 12:03:37 EDT 2015