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
228.0570 -80.5379 0.0127 26.2719 -109.9811 2.5864169 15.203 TRIG_00323984
Foreground time interval of the image:
-104.996 12.877 (delta_t = 117.873 [sec])
Background time interval of the image:
-239.424 -104.996 (delta_t = 134.428 [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 -104.996 sec. to 109.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51673 ( -0.0843159 0.0845144 )
Norm@50keV : 1.79826E-03 ( -8.30342e-05 8.27559e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.81 using 59 PHA bins.
# Reduced chi-squared = 0.7686 for 57 degrees of freedom
# Null hypothesis probability = 9.000920e-01
Photon flux (15-150 keV) in 214.6 sec: 0.225518 ( -0.0105954 0.010614 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6511e-06 ( -1.83964e-07 1.84915e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -104.996 sec. to 109.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39107 ( -0.325188 0.16945 )
Epeak [keV] : 243.438 ( -243.441 -243.441 )
Norm@50keV : 2.07819E-03 ( -0.000350043 0.000913732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.32 using 59 PHA bins.
# Reduced chi-squared = 0.7736 for 56 degrees of freedom
# Null hypothesis probability = 8.921391e-01
Photon flux (15-150 keV) in 214.6 sec: 0.223798 ( -0.011336 0.01132 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61163e-06 ( -2.10523e-07 2.08591e-07 ) ergs/cm2
Band function
Time interval is from -104.996 sec. to 109.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.255356 ( -1.5189 0.413593 )
beta : -1.59947 ( -0.146823 0.111928 )
Epeak [keV] : 37.3281 ( -14.7465 65.3773 )
Norm@50keV : 2.89143E-02 ( -0.0299269 70.7479 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.36 using 59 PHA bins.
# Reduced chi-squared = 0.7338 for 55 degrees of freedom
# Null hypothesis probability = 9.303579e-01
Photon flux (15-150 keV) in 214.6 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] : 14.8021 ( )
R^2/D10^2 : 2.57014E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 160.54 using 59 PHA bins.
# Reduced chi-squared = 2.8164 for 57 degrees of freedom
# Null hypothesis probability = 8.598964e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.535e-07 2.275e-08
25- 50 9.950e-07 6.041e-08
50-150 1.475e-06 1.382e-07
15-150 2.723e-06 1.395e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.918128 (-0.0413815 0.0413665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.72 using 59 PHA bins.
# Reduced chi-squared = 0.7845 for 57 degrees of freedom
# Null hypothesis probability = 8.812976e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.908e-07 2.554e-08
25- 50 9.441e-07 4.700e-08
50-150 2.071e-06 1.164e-07
15-150 3.505e-06 1.921e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.51679 (-0.957312 1.03786)
R1^2/D10^2 : 0.194516 (-0.067505 0.114935)
kT2 [keV] : 30.3636 (-4.90523 7.7596)
R2^2/D10^2 : 1.69320E-03 (-0.000877875 0.0014272)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.14 using 59 PHA bins.
# Reduced chi-squared = 0.7117 for 55 degrees of freedom
# Null hypothesis probability = 9.476740e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.576e-07 7.050e-08
25- 50 9.577e-07 1.073e-07
50-150 2.225e-06 4.500e-07
15-150 3.641e-06 6.363e-07
Peak spectrum fit
Power-law model
Time interval is from 8.240 sec. to 9.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39868 ( -0.267021 0.268493 )
Norm@50keV : 8.39811E-03 ( -0.00135394 0.00134742 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.57 using 59 PHA bins.
# Reduced chi-squared = 0.6590 for 57 degrees of freedom
# Null hypothesis probability = 9.781528e-01
Photon flux (15-150 keV) in 1 sec: 1.02243 ( -0.164235 0.164554 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11711e-08 ( -1.43854e-08 1.46226e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.240 sec. to 9.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.397880 ( -1.55835 1.09961 )
Epeak [keV] : 80.1257 ( -22.1659 -80.1256 )
Norm@50keV : 2.67222E-02 ( -0.0267223 0.124731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.44 using 59 PHA bins.
# Reduced chi-squared = 0.6329 for 56 degrees of freedom
# Null hypothesis probability = 9.855320e-01
Photon flux (15-150 keV) in 1 sec: 0.980477 ( -0.172876 0.172243 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.54181e-08 ( -1.55294e-08 1.59697e-08 ) ergs/cm2
Band function
Time interval is from 8.240 sec. to 9.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.397832 ( 0.805932 0.805932 )
beta : -10.00000 ( 10 4.33893e-11 )
Epeak [keV] : 80.1116 ( -21.4999 589.104 )
Norm@50keV : 2.67245E-02 ( -0.0041808 0.125193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.44 using 59 PHA bins.
# Reduced chi-squared = 0.6444 for 55 degrees of freedom
# Null hypothesis probability = 9.813215e-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] : 15.7944 (-2.63307 3.29264)
R^2/D10^2 : 0.101913 (-0.0492076 0.0900685)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.02 using 59 PHA bins.
# Reduced chi-squared = 0.6846 for 57 degrees of freedom
# Null hypothesis probability = 9.669892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.272e-09 1.743e-09
25- 50 2.194e-08 5.675e-09
50-150 3.806e-08 1.177e-08
15-150 6.526e-08 1.651e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-80.426 -199.363)
Norm : 4.22813 (-0.667397 0.667396)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.36 using 59 PHA bins.
# Reduced chi-squared = 0.6555 for 57 degrees of freedom
# Null hypothesis probability = 9.794288e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.053e-08 5.975e-09
25- 50 2.025e-08 1.168e-08
50-150 4.442e-08 2.522e-08
15-150 7.520e-08 4.283e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.45760 (-3.78593 -5.4576)
R1^2/D10^2 : 1.57107 (-1.48425 7.37925)
kT2 [keV] : 19.4070 (-4.66236 -19.407)
R2^2/D10^2 : 4.41940E-02 (-0.044012 0.0806685)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.29 using 59 PHA bins.
# Reduced chi-squared = 0.6417 for 55 degrees of freedom
# Null hypothesis probability = 9.821714e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.602e-09 5.030e-09
25- 50 2.016e-08 1.039e-08
50-150 4.430e-08 2.498e-08
15-150 7.306e-08 3.927e-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: 1.47484 ( -0.133581 0.134157 )
Norm@50keV : 1.48947E-03 ( -0.000118031 0.000117623 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.64 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.514282e-01
Photon flux (15-150 keV) in 117.9 sec: 0.184714 ( -0.0145396 0.0145587 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67301e-06 ( -1.45459e-07 1.4671e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.799382 ( -0.614736 0.537511 )
Epeak [keV] : 87.3847 ( -21.6272 133.339 )
Norm@50keV : 3.29289E-03 ( -0.00151084 0.00337093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.88 using 59 PHA bins.
# Reduced chi-squared = 0.9443 for 56 degrees of freedom
# Null hypothesis probability = 5.936951e-01
Photon flux (15-150 keV) in 117.9 sec: 0.178949 ( -0.015237 0.015235 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5816e-06 ( -1.62065e-07 1.63645e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.799350 ( -0.337501 0.585557 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 87.3692 ( -17.1087 133.152 )
Norm@50keV : 3.29287E-03 ( -0.00151262 0.00337343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.88 using 59 PHA bins.
# Reduced chi-squared = 0.9615 for 55 degrees of freedom
# Null hypothesis probability = 5.560278e-01
Photon flux (15-150 keV) in 117.9 sec: 0.179546 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61683e-06 ( -1.61601e-06 -1.52975e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 9.10e-07
S(50-100 keV) = 1.27e-06
T90 vs. Hardness ratio plot
T90 = 148.212000012398 sec.
Hardness ratio (energy fluence ratio) = 1.3956
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.40354
Count Ratio (50-100 keV) / (15-25 keV) = 0.980203
Mask shadow pattern
IMX = -1.686745831372712E-01, IMY = 4.639067118422541E-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:
-239.424000 -104.996000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9916 -37.8294 1.0 37.0 -20.8 1.8181 11.6 0.9 4U 1700-377
256.3341 -36.6013 8.0 37.9 -19.3 0.2279 1.4 11.8 GX 349+2
263.0254 -24.7936 12.0 45.7 -3.3 0.2090 1.0 3.0 GX 1+4
264.9367 -44.4435 7.1 27.7 -17.4 -0.2094 -1.6 8.3 4U 1735-44
270.1537 -25.0911 4.5 42.9 5.1 0.5150 2.6 7.1 GX 5-1
270.2622 -25.6393 4.1 42.4 4.9 0.5521 2.8 6.6 GRS 1758-258
274.0024 -13.8779 5.7 52.5 14.5 1.0598 2.1 9.5 GX 17+2
275.8684 -30.3305 5.4 36.3 9.7 0.3590 2.1 3.7 H1820-303
285.0354 -24.8154 4.1 39.3 24.9 0.5925 2.8 6.3 HT1900.1-2455
263.0750 -33.7885 2.7 37.5 -9.2 0.6293 4.2 5.1 GX 354-0
297.6307 -48.9958 3.3 13.7 37.9 0.4331 3.5 ------ UNKNOWN
46.6900 -48.4586 3.2 54.2 177.0 1.6905 3.5 ------ UNKNOWN
51.2745 -47.1396 3.4 57.0 179.3 3.0214 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-104.996000 12.876590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0729 -37.7652 5.2 37.0 -20.6 -0.4176 -2.2 6.3 4U 1700-377
256.4493 -36.2660 14.8 38.1 -18.9 0.1487 0.8 9.4 GX 349+2
263.0625 -24.5655 0.0 45.9 -3.1 0.2564 1.0 11.2 GX 1+4
264.8774 -44.4134 5.1 27.8 -17.5 0.3356 2.3 6.2 4U 1735-44
270.1596 -25.1014 7.8 42.9 5.1 -0.3478 -1.5 6.9 GX 5-1
270.4175 -25.8296 3.8 42.2 5.0 0.6977 3.0 8.1 GRS 1758-258
273.9000 -13.9574 2.7 52.4 14.3 -2.4471 -4.3 7.8 GX 17+2
275.8411 -30.4818 11.5 36.1 9.6 -0.2018 -1.0 8.1 H1820-303
284.8832 -24.9516 10.7 39.2 24.7 -0.2693 -1.1 8.5 HT1900.1-2455
262.9046 -34.0209 0.0 37.4 -9.6 0.5665 3.3 11.9 GX 354-0
277.7664 -11.7825 2.9 53.6 19.6 2.9837 4.0 ------ UNKNOWN
259.3095 -21.8655 2.0 49.7 -5.9 1.8148 5.9 ------ UNKNOWN
53.3580 -56.6816 2.5 49.6 -172.9 1.3408 4.6 ------ UNKNOWN
261.8082 -47.7604 2.7 26.5 -25.7 0.5982 4.4 ------ UNKNOWN
228.0627 -80.5389 0.8 26.3 -110.0 2.5726 15.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
60.476600 962.575500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5644 -60.4682 8.7 25.6 -102.1 0.8453 1.3 11.8 Cen X-3
186.8446 -62.7637 2.7 21.0 -85.3 2.4737 4.2 5.2 GX 301-2
256.0026 -37.8379 1.2 43.9 4.4 7.2485 9.7 0.8 4U 1700-377
256.3435 -36.2691 9.7 45.5 4.5 1.0038 1.2 10.3 GX 349+2
264.6618 -44.3051 10.3 38.4 15.5 -0.6801 -1.1 9.4 4U 1735-44
263.0481 -33.7964 3.3 48.6 11.6 3.7430 3.5 3.7 GX 354-0
280.6092 -43.8186 2.5 40.9 33.1 3.7896 4.6 ------ UNKNOWN
55.2708 -50.0262 3.3 49.4 158.2 5.2818 3.5 ------ UNKNOWN
255.2687 -41.6151 2.3 40.1 4.2 3.2594 5.0 ------ UNKNOWN
83.5260 -66.3066 3.2 31.9 178.3 1.9076 3.6 ------ UNKNOWN
242.5725 -59.3413 3.7 21.6 -7.5 1.4339 3.1 ------ UNKNOWN
86.3185 -40.5112 4.3 57.2 -173.8 7.4876 2.7 ------ UNKNOWN
114.8976 -63.6684 2.4 31.2 -156.0 2.3621 4.8 ------ UNKNOWN
116.3273 -46.9125 3.0 47.3 -148.1 4.2273 3.9 ------ UNKNOWN
232.4010 -21.7986 3.8 58.7 -23.2 10.1610 3.1 ------ UNKNOWN
Plot creation:
Sun May 31 06:31:12 EDT 2015