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
269.1056 -32.7924 0.0036 18.1521 -129.2073 4.0466769 52.857 TRIG_00341504
Foreground time interval of the image:
-0.212 26.720 (delta_t = 26.932 [sec])
Background time interval of the image:
-119.744 -119.607 (delta_t = 0.137 [sec])
-118.744 -0.212 (delta_t = 118.532 [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 0.256000
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 0.256000
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 0.256000
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 -0.212 sec. to 26.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82394 ( -0.0621259 0.0625572 )
Norm@50keV : 8.91379E-03 ( -0.000286178 0.000285331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.18 using 59 PHA bins.
# Reduced chi-squared = 0.8102 for 57 degrees of freedom
# Null hypothesis probability = 8.466841e-01
Photon flux (15-150 keV) in 26.93 sec: 1.23989 ( -0.0417345 0.041914 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2083e-06 ( -7.18253e-08 7.20582e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.212 sec. to 26.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59751 ( -0.254569 0.238986 )
Epeak [keV] : 88.0198 ( -23.3398 -88.0198 )
Norm@50keV : 1.15444E-02 ( -0.00268708 0.00379569 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.60 using 59 PHA bins.
# Reduced chi-squared = 0.7785 for 56 degrees of freedom
# Null hypothesis probability = 8.863868e-01
Photon flux (15-150 keV) in 26.93 sec: 1.21611 ( -0.0481 0.04832 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16111e-06 ( -8.77514e-08 8.75306e-08 ) ergs/cm2
Band function
Time interval is from -0.212 sec. to 26.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44935 ( 1.44934 2.80422 )
beta : -1.93621 ( 1.93619 0.140296 )
Epeak [keV] : 62.6692 ( -62.6671 -62.6671 )
Norm@50keV : 1.42481E-02 ( -0.00469774 932.677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.57 using 59 PHA bins.
# Reduced chi-squared = 0.7922 for 55 degrees of freedom
# Null hypothesis probability = 8.667362e-01
Photon flux (15-150 keV) in 26.93 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16301e-06 ( -2.16282e-06 -8.55162e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9778 ( )
R^2/D10^2 : 0.206235 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 260.86 using 59 PHA bins.
# Reduced chi-squared = 4.5764 for 57 degrees of freedom
# Null hypothesis probability = 7.438373e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.984e-07 1.212e-08
25- 50 6.820e-07 2.262e-08
50-150 7.255e-07 4.780e-08
15-150 1.606e-06 5.453e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 103.864 (-11.3257 18.9043)
Norm : 5.31565 (-0.286248 0.246151)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.56 using 59 PHA bins.
# Reduced chi-squared = 0.8344 for 57 degrees of freedom
# Null hypothesis probability = 8.091008e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.741e-07 2.666e-08
25- 50 6.518e-07 2.760e-08
50-150 1.079e-06 2.565e-07
15-150 2.105e-06 2.771e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.54390 (-0.721573 0.767508)
R1^2/D10^2 : 1.82702 (-0.595305 1.00728)
kT2 [keV] : 23.1189 (-2.49723 3.32023)
R2^2/D10^2 : 1.88029E-02 (-0.00752006 0.0106612)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.61 using 59 PHA bins.
# Reduced chi-squared = 0.9020 for 55 degrees of freedom
# Null hypothesis probability = 6.799945e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.628e-07 4.457e-08
25- 50 6.421e-07 4.794e-08
50-150 1.111e-06 1.268e-07
15-150 2.116e-06 1.684e-07
Peak spectrum fit
Power-law model
Time interval is from 1.004 sec. to 2.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43377 ( -0.0961552 0.0965682 )
Norm@50keV : 3.06030E-02 ( -0.00166569 0.00165991 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
# Reduced chi-squared = 0.9141 for 57 degrees of freedom
# Null hypothesis probability = 6.588123e-01
Photon flux (15-150 keV) in 1 sec: 3.75646 ( -0.205122 0.205359 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93741e-07 ( -1.77623e-08 1.78719e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.004 sec. to 2.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08832 ( -0.405773 0.372574 )
Epeak [keV] : 134.236 ( -47.2423 -134.236 )
Norm@50keV : 4.53999E-02 ( -0.0151728 0.0259342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.58 using 59 PHA bins.
# Reduced chi-squared = 0.8854 for 56 degrees of freedom
# Null hypothesis probability = 7.149164e-01
Photon flux (15-150 keV) in 1 sec: 3.68794 ( -0.21749 0.21741 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8568e-07 ( -2.0007e-08 1.9932e-08 ) ergs/cm2
Band function
Time interval is from 1.004 sec. to 2.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.698382 ( -0.714594 5.10635 )
beta : -1.58806 ( 1.58751 0.188116 )
Epeak [keV] : 70.9934 ( -39.2493 606.98 )
Norm@50keV : 8.04396E-02 ( -0.0494231 1938.54 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.19 using 59 PHA bins.
# Reduced chi-squared = 0.8943 for 55 degrees of freedom
# Null hypothesis probability = 6.952661e-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] : 15.5086 ( )
R^2/D10^2 : 0.379389 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.96 using 59 PHA bins.
# Reduced chi-squared = 2.0344 for 57 degrees of freedom
# Null hypothesis probability = 6.588219e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.899e-08 1.970e-09
25- 50 7.777e-08 6.030e-09
50-150 1.291e-07 1.365e-08
15-150 2.259e-07 1.530e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 15.3672 (-0.825516 0.825529)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9486 for 57 degrees of freedom
# Null hypothesis probability = 5.856005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.844e-08 2.380e-09
25- 50 7.395e-08 4.700e-09
50-150 1.622e-07 3.340e-08
15-150 2.746e-07 2.245e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.65011 (-1.38317 1.51935)
R1^2/D10^2 : 2.69122 (-1.14393 2.46472)
kT2 [keV] : 27.9476 (-4.87809 8.36847)
R2^2/D10^2 : 3.92703E-02 (-0.0232307 0.039754)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.11 using 59 PHA bins.
# Reduced chi-squared = 0.8929 for 55 degrees of freedom
# Null hypothesis probability = 6.981419e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.250e-08 6.910e-09
25- 50 7.442e-08 1.448e-08
50-150 1.794e-07 5.154e-08
15-150 2.863e-07 5.745e-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: 1.82394 ( -0.0621259 0.0625572 )
Norm@50keV : 8.91379E-03 ( -0.000286178 0.000285331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.18 using 59 PHA bins.
# Reduced chi-squared = 0.8102 for 57 degrees of freedom
# Null hypothesis probability = 8.466841e-01
Photon flux (15-150 keV) in 26.93 sec: 1.23989 ( -0.0417345 0.041914 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2083e-06 ( -7.18253e-08 7.20582e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59751 ( -0.254569 0.238986 )
Epeak [keV] : 88.0198 ( -23.3398 -88.0198 )
Norm@50keV : 1.15444E-02 ( -0.00268708 0.00379569 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.60 using 59 PHA bins.
# Reduced chi-squared = 0.7785 for 56 degrees of freedom
# Null hypothesis probability = 8.863868e-01
Photon flux (15-150 keV) in 26.93 sec: 1.21611 ( -0.0481 0.04832 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16111e-06 ( -8.77514e-08 8.75306e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44935 ( 1.44934 2.80422 )
beta : -1.93621 ( 1.93619 0.140296 )
Epeak [keV] : 62.6692 ( -62.6671 -62.6671 )
Norm@50keV : 1.42481E-02 ( -0.00469774 932.677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.57 using 59 PHA bins.
# Reduced chi-squared = 0.7922 for 55 degrees of freedom
# Null hypothesis probability = 8.667362e-01
Photon flux (15-150 keV) in 26.93 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16301e-06 ( -2.16282e-06 -8.55162e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.27e-07
S(50-100 keV) = 7.09e-07
T90 vs. Hardness ratio plot
T90 = 17.6240000128746 sec.
Hardness ratio (energy fluence ratio) = 1.13078
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.1648
Count Ratio (50-100 keV) / (15-25 keV) = 0.678777
Mask shadow pattern
IMX = -2.072476352934535E-01, IMY = 2.540448039391481E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-119.744000 -119.607500
-118.744000 -0.212000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2999 -60.4928 84.2 48.1 39.1 -0.0843 -0.1 7.8 Cen X-3
186.6830 -62.7873 1.3 40.0 38.4 2.7879 9.2 1.3 GX 301-2
244.9804 -15.6531 0.5 30.2 164.7 4.0013 23.1 0.8 Sco X-1
255.9448 -37.7774 5.7 8.0 -158.8 0.2575 2.0 4.5 4U 1700-377
256.3333 -36.4242 3.6 9.4 -159.9 0.4076 3.2 4.9 GX 349+2
263.0862 -24.8582 5.8 22.3 -154.4 0.2822 2.0 8.0 GX 1+4
264.5382 -44.4907 6.7 8.9 -92.2 0.2253 1.7 9.1 4U 1735-44
268.3689 -1.4510 10.3 46.1 -158.8 0.2853 1.1 0.1 SW J1753.5-0127
270.2159 -25.0203 3.2 25.0 -139.7 0.5283 3.6 5.1 GX 5-1
270.1975 -25.6083 4.7 24.5 -139.0 0.3690 2.4 9.9 GRS 1758-258
274.0267 -14.0014 3.1 36.4 -143.9 0.7295 3.8 2.4 GX 17+2
275.7363 -30.2543 3.5 23.9 -122.5 0.5160 3.3 11.9 H1820-303
284.9503 -24.9886 4.0 33.3 -118.0 0.6215 2.9 6.2 HT1900.1-2455
262.9862 -33.8936 2.4 14.1 -141.4 0.6212 4.9 3.5 GX 354-0
229.4030 -23.9080 1.9 28.1 130.0 1.1331 6.0 ------ UNKNOWN
230.8698 -35.1111 2.4 19.0 113.1 0.7452 4.9 ------ UNKNOWN
261.2344 -20.0026 2.8 26.4 -161.9 0.5920 4.2 ------ UNKNOWN
344.4351 -64.8158 3.1 51.0 -35.0 1.8020 3.8 ------ UNKNOWN
317.0630 -47.5845 3.6 43.6 -64.4 2.1387 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.212000 26.720000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3242 -60.6215 35.0 48.0 38.9 0.1051 0.3 0.3 Cen X-3
186.7842 -62.8908 9.0 39.9 38.3 -0.2144 -1.3 8.0 GX 301-2
245.1319 -15.5332 5.2 30.3 165.0 -0.2018 -2.2 10.9 Sco X-1
255.7992 -37.8957 5.1 7.9 -159.3 -0.1633 -2.3 9.4 4U 1700-377
256.6245 -36.5704 0.0 9.4 -158.2 -0.0365 -0.5 12.7 GX 349+2
262.8455 -24.6048 6.6 22.4 -155.1 0.1274 1.8 12.3 GX 1+4
264.8624 -44.4009 19.7 9.2 -92.5 0.0424 0.6 5.9 4U 1735-44
268.3373 -1.5384 3.7 46.0 -158.8 0.4636 3.1 5.5 SW J1753.5-0127
270.4012 -25.0043 4.8 25.1 -139.4 0.2035 2.4 7.8 GX 5-1
270.2614 -25.8511 7.7 24.3 -138.5 0.1251 1.5 6.9 GRS 1758-258
273.8759 -14.0748 4.1 36.3 -144.1 0.2898 2.8 7.9 GX 17+2
275.7145 -30.2578 0.0 23.9 -122.6 -0.1072 -1.3 12.7 H1820-303
284.8415 -24.8409 75.1 33.4 -118.3 -0.0190 -0.2 11.6 HT1900.1-2455
263.0378 -33.7250 4.8 14.3 -141.6 0.1795 2.4 7.0 GX 354-0
181.6698 -53.7408 2.5 44.5 50.7 1.6667 4.7 ------ UNKNOWN
198.1638 -60.9298 2.3 34.7 41.8 0.6466 5.1 ------ UNKNOWN
237.1746 4.1878 3.3 51.2 159.1 1.1135 3.5 ------ UNKNOWN
231.6985 -35.1879 2.3 18.4 114.3 0.4123 5.0 ------ UNKNOWN
269.1056 -32.7924 0.2 18.2 -129.2 4.0464 52.9 ------ UNKNOWN
266.3284 7.4401 2.8 54.2 -164.2 0.8755 4.1 ------ UNKNOWN
282.6851 -7.8614 2.0 45.8 -137.0 1.0320 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
75.956600 302.346000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4973 -60.4540 20.0 35.1 44.7 0.2138 0.6 11.5 Cen X-3
186.6912 -62.7799 0.8 27.1 43.8 3.2441 13.7 1.1 GX 301-2
244.9880 -15.6415 0.6 39.1 -176.5 5.7821 19.6 0.5 Sco X-1
256.0507 -37.9360 2.7 20.6 -142.8 0.8362 4.2 6.3 4U 1700-377
256.4168 -36.5070 4.5 22.0 -144.1 0.5086 2.5 5.1 GX 349+2
262.9011 -24.8948 0.0 34.8 -145.1 0.2124 0.8 10.7 GX 1+4
264.6739 -44.3408 8.9 20.0 -116.4 0.2762 1.3 7.2 4U 1735-44
270.3000 -25.0573 3.2 37.9 -135.0 1.2415 3.6 1.6 GX 5-1
270.3161 -25.6173 3.9 37.4 -134.5 1.0017 2.9 7.6 GRS 1758-258
274.1335 -14.1348 5.3 49.2 -138.1 1.7808 2.2 9.5 GX 17+2
275.9247 -30.3670 1862.8 36.3 -123.2 0.0020 0.0 0.0 H1820-303
262.9535 -33.8115 2.8 27.1 -136.5 1.0190 4.1 2.3 GX 354-0
155.7793 -66.8841 2.5 38.8 30.8 1.6781 4.7 ------ UNKNOWN
Plot creation:
Sun May 31 04:56:42 EDT 2015