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
213.0880 -11.4905 0.0044 32.3197 -26.1081 1.9945508 43.427 TRIG_00324805
Foreground time interval of the image:
-0.532 6.148 (delta_t = 6.680 [sec])
Background time interval of the image:
-60.240 -0.532 (delta_t = 59.708 [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 0.128000
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 0.128000
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 0.128000
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 -0.532 sec. to 6.148 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95677 ( -0.0762457 0.0773066 )
Norm@50keV : 1.78414E-02 ( -0.0007852 0.000779724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.98 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 57 degrees of freedom
# Null hypothesis probability = 8.740461e-02
Photon flux (15-150 keV) in 6.68 sec: 2.62440 ( -0.104163 0.1044 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09702e-06 ( -4.65851e-08 4.68957e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.532 sec. to 6.148 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43893 ( -0.338298 0.311964 )
Epeak [keV] : 48.3311 ( -7.59374 12.136 )
Norm@50keV : 3.39555E-02 ( -0.0107 0.0175358 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 56 degrees of freedom
# Null hypothesis probability = 2.290997e-01
Photon flux (15-150 keV) in 6.68 sec: 2.53206 ( -0.11629 0.11658 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03672e-06 ( -5.72877e-08 5.80492e-08 ) ergs/cm2
Band function
Time interval is from -0.532 sec. to 6.148 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43898 ( -0.23473 0.459997 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 48.3216 ( -7.58637 12.1339 )
Norm@50keV : 3.39482E-02 ( -0.010707 0.0175478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 55 degrees of freedom
# Null hypothesis probability = 2.018530e-01
Photon flux (15-150 keV) in 6.68 sec: 2.55089 ( 4.44911 -0.1399 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0501e-06 ( -1.05005e-06 -5.28856e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8936 ( )
R^2/D10^2 : 0.836173 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 179.73 using 59 PHA bins.
# Reduced chi-squared = 3.1532 for 57 degrees of freedom
# Null hypothesis probability = 1.237194e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.382e-07 9.452e-09
25- 50 3.860e-07 1.593e-08
50-150 2.568e-07 2.879e-08
15-150 7.810e-07 3.240e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.4347 (-9.45062 11.716)
Norm : 12.3028 (-0.803544 0.879784)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.80 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.497225e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.123e-07 1.239e-08
25- 50 3.445e-07 1.296e-08
50-150 4.671e-07 4.335e-08
15-150 1.024e-06 4.409e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.55147 (-0.728185 0.740649)
R1^2/D10^2 : 4.18084 (-1.30447 2.19637)
kT2 [keV] : 21.6947 (-3.02602 4.13012)
R2^2/D10^2 : 4.24813E-02 (-0.0208773 0.0356961)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.85 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 55 degrees of freedom
# Null hypothesis probability = 3.363357e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.037e-07 2.351e-08
25- 50 3.451e-07 3.434e-08
50-150 4.863e-07 1.046e-07
15-150 1.035e-06 1.500e-07
Peak spectrum fit
Power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72755 ( -0.0667085 0.0672488 )
Norm@50keV : 6.41221E-02 ( -0.00248469 0.00247648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.09 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.410017e-02
Photon flux (15-150 keV) in 1 sec: 8.59975 ( -0.329203 0.329735 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.92504e-07 ( -2.38715e-08 2.39625e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11781 ( -0.309358 0.288002 )
Epeak [keV] : 69.2192 ( -9.52149 20.8592 )
Norm@50keV : 0.132540 ( -0.0377867 0.0581493 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.03 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 56 degrees of freedom
# Null hypothesis probability = 3.653336e-01
Photon flux (15-150 keV) in 1 sec: 8.30166 ( -0.35421 0.35477 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61973e-07 ( -2.7705e-08 2.7766e-08 ) ergs/cm2
Band function
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.35612E-02 ( -0.85794 2.27157 )
beta : -1.97798 ( -0.191373 0.136893 )
Epeak [keV] : 42.4145 ( -7.78393 14.7927 )
Norm@50keV : 0.645858 ( -1.0059 24.3332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.03 using 59 PHA bins.
# Reduced chi-squared = 0.9641 for 55 degrees of freedom
# Null hypothesis probability = 5.504155e-01
Photon flux (15-150 keV) in 1 sec: 8.18646 ( -1.18646 -0.36063 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6656e-07 ( -5.66553e-07 -2.5793e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7970 ( )
R^2/D10^2 : 1.62059 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 177.10 using 59 PHA bins.
# Reduced chi-squared = 3.1069 for 57 degrees of freedom
# Null hypothesis probability = 3.100754e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.629e-08 3.790e-09
25- 50 1.906e-07 7.600e-09
50-150 1.955e-07 1.640e-08
15-150 4.423e-07 2.025e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 123.456 ( )
Norm : 36.1584 (-1.67214 2.13343)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.782556e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.265e-08 6.320e-09
25- 50 1.674e-07 8.850e-09
50-150 3.073e-07 7.760e-08
15-150 5.673e-07 8.555e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.83650 (-0.894481 0.907514)
R1^2/D10^2 : 6.77964 (-1.94828 3.14861)
kT2 [keV] : 26.0919 (-4.07276 6.26613)
R2^2/D10^2 : 8.10477E-02 (-0.0441245 0.0769802)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.42 using 59 PHA bins.
# Reduced chi-squared = 0.9713 for 55 degrees of freedom
# Null hypothesis probability = 5.351769e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.348e-08 8.645e-09
25- 50 1.794e-07 1.780e-08
50-150 3.027e-07 6.700e-08
15-150 5.655e-07 8.615e-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: 1.95677 ( -0.0762457 0.0773066 )
Norm@50keV : 1.78414E-02 ( -0.0007852 0.000779724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.98 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 57 degrees of freedom
# Null hypothesis probability = 8.740461e-02
Photon flux (15-150 keV) in 6.68 sec: 2.62440 ( -0.104163 0.1044 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09702e-06 ( -4.65851e-08 4.68957e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43893 ( -0.338298 0.311964 )
Epeak [keV] : 48.3311 ( -7.59374 12.136 )
Norm@50keV : 3.39555E-02 ( -0.0107 0.0175358 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 56 degrees of freedom
# Null hypothesis probability = 2.290997e-01
Photon flux (15-150 keV) in 6.68 sec: 2.53206 ( -0.11629 0.11658 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03672e-06 ( -5.72877e-08 5.80492e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43898 ( -0.23473 0.459997 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 48.3216 ( -7.58637 12.1339 )
Norm@50keV : 3.39482E-02 ( -0.010707 0.0175478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 55 degrees of freedom
# Null hypothesis probability = 2.018530e-01
Photon flux (15-150 keV) in 6.68 sec: 2.55089 ( 4.44911 -0.1399 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0501e-06 ( -1.05005e-06 -5.28856e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.26e-07
S(50-100 keV) = 3.36e-07
T90 vs. Hardness ratio plot
T90 = 4.05200001597404 sec.
Hardness ratio (energy fluence ratio) = 1.03067
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.1748
Count Ratio (50-100 keV) / (15-25 keV) = 0.656113
Mask shadow pattern
IMX = 5.681019625274246E-01, IMY = 2.784099831101502E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
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:
-60.240000 -0.532000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5550 -40.4964 9.7 45.1 -170.2 0.1432 1.2 3.7 Vela X-1
170.5941 -60.6347 4.8 25.9 149.6 -0.1964 -2.4 8.2 Cen X-3
186.6346 -62.6564 6.9 23.3 131.6 0.1457 1.7 6.9 GX 301-2
245.0368 -15.6376 2.7 49.1 15.8 0.9539 4.3 3.3 Sco X-1
256.0396 -37.8918 12.8 46.0 48.6 0.2982 0.9 3.8 4U 1700-377
229.6159 -17.6900 2.7 36.7 3.4 0.4056 4.3 ------ UNKNOWN
199.3564 6.7896 2.5 46.9 -54.3 1.5655 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.532000 6.148000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5066 -40.5455 16.3 45.1 -170.3 0.0480 0.7 1.1 Vela X-1
170.3148 -60.6247 37.4 26.0 149.8 0.0137 0.3 0.1 Cen X-3
186.7850 -62.9028 12.0 23.6 131.2 -0.0463 -1.0 8.7 GX 301-2
245.0751 -15.6864 15.2 49.1 15.8 0.0893 0.8 6.2 Sco X-1
255.9022 -37.7509 7.3 45.9 48.4 0.2691 1.6 6.9 4U 1700-377
213.0880 -11.4905 0.3 32.3 -26.1 1.9945 43.4 ------ UNKNOWN
147.8453 -19.3603 2.5 45.8 -136.9 0.4129 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
185.260600 842.842800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9817 -15.6333 0.6 41.0 -49.2 21.7045 19.6 0.4 Sco X-1
255.9908 -37.8274 0.6 22.1 -79.8 11.3359 20.0 1.0 4U 1700-377
256.6235 -36.5406 4.1 21.8 -76.2 1.5646 2.8 11.5 GX 349+2
263.1484 -24.5762 14.1 22.2 -40.5 0.3922 0.8 12.7 GX 1+4
264.9394 -44.3573 4.1 15.8 -101.5 1.3326 2.8 10.1 4U 1735-44
268.3285 -1.4575 3.4 39.2 -6.7 2.2951 3.4 2.4 SW J1753.5-0127
270.2395 -25.0279 2.3 17.4 -27.7 2.2791 5.0 3.9 GX 5-1
270.1768 -25.7659 2.5 16.9 -29.4 2.0139 4.6 6.9 GRS 1758-258
274.0050 -14.0569 1.6 25.5 -4.5 4.1784 7.2 1.2 GX 17+2
275.9535 -30.3040 2.5 10.2 -25.2 2.1925 4.7 4.1 H1820-303
285.1531 -25.0423 5.1 12.9 23.0 0.9857 2.3 9.7 HT1900.1-2455
288.8290 10.9700 2.0 49.1 24.9 10.0910 5.8 2.3 GRS 1915+105
263.0240 -33.8319 3.8 17.5 -64.2 1.4885 3.0 1.7 GX 354-0
280.6153 -11.4337 1.6 26.7 11.1 3.6442 7.1 ------ UNKNOWN
270.8837 -5.0162 3.7 35.0 -4.6 1.9382 3.1 ------ UNKNOWN
Plot creation:
Sun May 31 06:24:31 EDT 2015