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
81.3274 32.4885 0.0045 44.8609 -159.5211 6.3778061 43.079 TRIG_00586071
Foreground time interval of the image:
0.152 27.624 (delta_t = 27.472 [sec])
Background time interval of the image:
-375.203 -322.332 (delta_t = 52.871 [sec])
-239.504 0.152 (delta_t = 239.656 [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 0.512000
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 0.512000
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 0.512000
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 0.152 sec. to 27.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42939 ( -0.0629735 0.0628625 )
Norm@50keV : 1.57204E-02 ( -0.000552818 0.00055273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9188 for 57 degrees of freedom
# Null hypothesis probability = 6.490061e-01
Photon flux (15-150 keV) in 27.47 sec: 1.92762 ( -0.0749455 0.07517 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14846e-06 ( -1.51773e-07 1.51915e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.152 sec. to 27.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16201 ( -0.262499 0.248105 )
Epeak [keV] : 178.253 ( -60.8906 1068.01 )
Norm@50keV : 2.07227E-02 ( -0.00456411 0.00623632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.99 using 59 PHA bins.
# Reduced chi-squared = 0.8748 for 56 degrees of freedom
# Null hypothesis probability = 7.352638e-01
Photon flux (15-150 keV) in 27.47 sec: 1.89603 ( -0.07987 0.08028 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.10119e-06 ( -1.59766e-07 1.59244e-07 ) ergs/cm2
Band function
Time interval is from 0.152 sec. to 27.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17570 ( -0.0952509 0.164762 )
beta : -9.35460 ( 9.36969 19.3697 )
Epeak [keV] : 185.374 ( -39.2394 230.127 )
Norm@50keV : 2.04141E-02 ( -0.000716466 0.00595393 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.00 using 59 PHA bins.
# Reduced chi-squared = 0.8908 for 55 degrees of freedom
# Null hypothesis probability = 7.020996e-01
Photon flux (15-150 keV) in 27.47 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] : 18.1653 ( )
R^2/D10^2 : 0.113492 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 210.39 using 59 PHA bins.
# Reduced chi-squared = 3.6910 for 57 degrees of freedom
# Null hypothesis probability = 1.954641e-19
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.054e-07 1.498e-08
25- 50 9.563e-07 5.109e-08
50-150 2.296e-06 1.303e-07
15-150 3.457e-06 1.456e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 8.06888 (-0.284385 0.28431)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.73 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.772911e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.521e-07 2.143e-08
25- 50 1.062e-06 4.244e-08
50-150 2.329e-06 9.175e-08
15-150 3.943e-06 1.525e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.10882 (-1.006 1.14909)
R1^2/D10^2 : 1.68627 (-0.667337 1.24341)
kT2 [keV] : 27.2590 (-2.68185 3.71996)
R2^2/D10^2 : 2.33083E-02 (-0.00867561 0.0109178)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.63 using 59 PHA bins.
# Reduced chi-squared = 0.9569 for 55 degrees of freedom
# Null hypothesis probability = 5.656806e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.608e-07 6.991e-08
25- 50 1.005e-06 8.900e-08
50-150 2.619e-06 2.404e-07
15-150 4.085e-06 3.090e-07
Peak spectrum fit
Power-law model
Time interval is from 1.692 sec. to 2.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22966 ( -0.0431811 0.0430742 )
Norm@50keV : 0.325954 ( -0.00835745 0.00835286 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.65 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.146372e-01
Photon flux (15-150 keV) in 1 sec: 38.4277 ( -1.05287 1.05436 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2799e-06 ( -8.69858e-08 8.70318e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.692 sec. to 2.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.739282 ( -0.189512 0.182245 )
Epeak [keV] : 152.383 ( -26.4766 53.6952 )
Norm@50keV : 0.532085 ( -0.0864664 0.107242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.28 using 59 PHA bins.
# Reduced chi-squared = 0.6479 for 56 degrees of freedom
# Null hypothesis probability = 9.810974e-01
Photon flux (15-150 keV) in 1 sec: 37.5933 ( -1.0858 1.0886 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24085e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.692 sec. to 2.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.290797 ( -0.616709 1.36193 )
beta : -1.43564 ( 1.43352 0.11062 )
Epeak [keV] : 85.9866 ( -37.2037 114.54 )
Norm@50keV : 0.969261 ( -0.553075 6.88336 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.84 using 59 PHA bins.
# Reduced chi-squared = 0.6515 for 55 degrees of freedom
# Null hypothesis probability = 9.788873e-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] : 20.2574 ( )
R^2/D10^2 : 1.72270 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 271.20 using 59 PHA bins.
# Reduced chi-squared = 4.7579 for 57 degrees of freedom
# Null hypothesis probability = 1.217851e-29
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.356e-07 6.900e-09
25- 50 6.811e-07 2.495e-08
50-150 2.075e-06 8.100e-08
15-150 2.892e-06 7.950e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 163.902 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 221.01 using 59 PHA bins.
# Reduced chi-squared = 3.8773 for 57 degrees of freedom
# Null hypothesis probability = 3.679039e-21
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.081e-07 1.085e-08
25- 50 7.851e-07 2.150e-08
50-150 1.722e-06 4.500e-08
15-150 2.915e-06 7.700e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.14927 (-1.01018 1.09839)
R1^2/D10^2 : 12.8029 (-3.48647 5.32511)
kT2 [keV] : 32.2967 (-3.00156 4.17875)
R2^2/D10^2 : 0.292162 (-0.101753 0.123894)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.87 using 59 PHA bins.
# Reduced chi-squared = 0.6340 for 55 degrees of freedom
# Null hypothesis probability = 9.844311e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.559e-07 2.615e-08
25- 50 7.478e-07 4.595e-08
50-150 2.245e-06 1.640e-07
15-150 3.249e-06 2.030e-07
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: 1.42939 ( -0.0629735 0.0628625 )
Norm@50keV : 1.57204E-02 ( -0.000552818 0.00055273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9188 for 57 degrees of freedom
# Null hypothesis probability = 6.490061e-01
Photon flux (15-150 keV) in 27.47 sec: 1.92762 ( -0.0749455 0.07517 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14846e-06 ( -1.51773e-07 1.51915e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16201 ( -0.262499 0.248105 )
Epeak [keV] : 178.253 ( -60.8906 1068.01 )
Norm@50keV : 2.07227E-02 ( -0.00456411 0.00623632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.99 using 59 PHA bins.
# Reduced chi-squared = 0.8748 for 56 degrees of freedom
# Null hypothesis probability = 7.352638e-01
Photon flux (15-150 keV) in 27.47 sec: 1.89603 ( -0.07987 0.08028 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.10119e-06 ( -1.59766e-07 1.59244e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17570 ( -0.0952509 0.164762 )
beta : -9.35460 ( 9.36969 19.3697 )
Epeak [keV] : 185.374 ( -39.2394 230.023 )
Norm@50keV : 2.04141E-02 ( -0.000716466 0.00595393 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.00 using 59 PHA bins.
# Reduced chi-squared = 0.8908 for 55 degrees of freedom
# Null hypothesis probability = 7.020996e-01
Photon flux (15-150 keV) in 27.47 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) = 9.90e-07
S(50-100 keV) = 1.47e-06
T90 vs. Hardness ratio plot
T90 = 20.432000041008 sec.
Hardness ratio (energy fluence ratio) = 1.48485
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.57783
Count Ratio (50-100 keV) / (15-25 keV) = 1.44803
Mask shadow pattern
IMX = -9.322627058378252E-01, IMY = 3.481684036310416E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-375.203410 -322.332200
-239.504000 0.152000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6266 22.0095 0.6 50.4 -171.9 11.9818 18.3 0.5 Crab
115.8749 40.4632 2.6 17.7 -179.1 1.1101 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.152000 27.624000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6289 21.8250 0.0 50.5 -172.1 0.2378 1.1 11.4 Crab
139.2645 9.1754 2.4 39.4 107.9 1.3863 4.8 ------ UNKNOWN
157.4625 28.5758 2.2 24.9 65.9 0.5421 5.2 ------ UNKNOWN
190.5623 29.8086 2.6 43.8 25.2 0.7146 4.4 ------ UNKNOWN
94.2929 8.5477 2.9 54.2 167.2 1.6855 4.0 ------ UNKNOWN
114.4034 45.7126 2.4 16.3 -161.3 0.3633 4.8 ------ UNKNOWN
81.3274 32.4885 0.3 44.9 -159.5 6.3777 43.1 ------ UNKNOWN
70.4680 26.3525 2.2 56.0 -157.6 1.8459 5.3 ------ UNKNOWN
63.3025 37.7057 2.1 53.4 -142.2 2.2706 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
466.896600 722.646000
900.496000 962.567900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8271 -15.6195 5.0 24.3 63.3 8.4976 2.3 8.9 Sco X-1
254.3807 35.3569 6.1 47.4 152.9 -19.7876 -1.9 3.9 Her X-1
256.0303 -38.0119 178.0 30.4 9.8 0.2101 0.1 10.3 4U 1700-377
256.4524 -36.4299 5.4 28.8 10.6 -6.8057 -2.1 0.9 GX 349+2
263.0813 -24.7537 10.0 15.8 9.5 3.1960 1.2 4.0 GX 1+4
264.5637 -44.5760 7.1 34.8 -5.2 5.9202 1.6 10.8 4U 1735-44
268.2187 -1.4426 6.5 8.6 163.5 -5.1257 -1.8 9.0 SW J1753.5-0127
270.1483 -24.9517 10.1 15.0 -14.6 -3.2417 -1.1 10.6 GX 5-1
270.1354 -25.8238 4.9 15.9 -14.3 6.5279 2.4 10.2 GRS 1758-258
273.9523 -13.9625 5.2 6.2 -60.5 6.7260 2.2 5.4 GX 17+2
275.9011 -30.2156 5.8 21.2 -27.3 6.0130 2.0 9.2 H1820-303
284.9110 -24.7687 10.1 21.1 -54.3 3.6429 1.1 11.4 HT1900.1-2455
288.7259 10.8141 20.6 28.5 -147.1 -2.0419 -0.6 9.0 GRS 1915+105
299.7056 35.2258 11.2 53.7 -159.7 -10.2409 -1.0 5.8 Cyg X-1
262.9925 -33.8340 29.1 24.5 1.5 -1.2851 -0.4 0.2 GX 354-0
229.6578 -7.0049 3.3 39.1 80.4 44.0240 3.5 ------ UNKNOWN
233.4884 -19.6604 2.8 35.7 59.3 26.2445 4.1 ------ UNKNOWN
236.8420 -27.1063 3.2 34.9 45.4 18.5416 3.6 ------ UNKNOWN
274.3514 -22.1354 2.8 13.2 -32.8 11.9053 4.1 ------ UNKNOWN
259.8167 -66.3876 2.5 56.8 -6.4 56.0883 4.6 ------ UNKNOWN
284.8201 -68.5502 3.7 59.5 -17.4 59.9582 3.1 ------ UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Sat May 30 14:28:29 EDT 2015