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
203.7674 -22.1213 0.0135 18.7851 108.6904 0.1903166 14.182 TRIG_00287344
Foreground time interval of the image:
-0.352 1.120 (delta_t = 1.472 [sec])
Background time interval of the image:
-239.520 -0.352 (delta_t = 239.168 [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 -0.352 sec. to 1.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66010 ( -0.209324 0.216476 )
Norm@50keV : 7.42670E-03 ( -0.00100568 0.000985353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.88 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.758412e-01
Photon flux (15-150 keV) in 1.472 sec: 0.972999 ( -0.116326 0.116348 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01572e-07 ( -1.45028e-08 1.47703e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.352 sec. to 1.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43176 ( -1.07343 0.434723 )
Epeak [keV] : 111.293 ( -105.958 -112.321 )
Norm@50keV : 9.95581E-03 ( -0.00606663 0.02912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.71 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 56 degrees of freedom
# Null hypothesis probability = 2.505629e-01
Photon flux (15-150 keV) in 1.472 sec: 0.965298 ( -0.120865 0.119252 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92384e-08 ( -1.73826e-08 1.66454e-08 ) ergs/cm2
Band function
Time interval is from -0.352 sec. to 1.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10340 ( 1.07291 1.07291 )
beta : -1.87553 ( 1.88794 0.407828 )
Epeak [keV] : 64.1909 ( -62.7676 211.383 )
Norm@50keV : 1.57917E-02 ( -0.00964642 765.39 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.357524e-01
Photon flux (15-150 keV) in 1.472 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84023e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0574 (-1.63527 1.92251)
R^2/D10^2 : 0.236403 (-0.0983731 0.164285)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.17 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 57 degrees of freedom
# Null hypothesis probability = 4.578590e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.070e-08 2.231e-09
25- 50 3.388e-08 5.645e-09
50-150 2.971e-08 8.847e-09
15-150 7.429e-08 1.217e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 142.961 (-60.2647 -141.293)
Norm : 4.04088 (-0.533562 0.703401)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.76 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 57 degrees of freedom
# Null hypothesis probability = 2.794893e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.534e-08 3.750e-09
25- 50 2.823e-08 1.173e-08
50-150 5.460e-08 3.267e-08
15-150 9.816e-08 4.571e-08
Double BB
R1^2/D10^2 : 0.444796 (-0.188909 6.277)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.02721E-04 (-3.95146e-05 3.95257e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.61 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.22 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.19 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 1.761392e-01
# Null hypothesis probability = 2.086676e-01
# Null hypothesis probability = 2.094732e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.430e-08 8.242e-09
25- 50 2.971e-08 1.575e-08
50-150 5.101e-08 3.020e-08
15-150 9.502e-08 5.105e-08
Peak spectrum fit
Power-law model
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54443 ( -0.201656 0.205684 )
Norm@50keV : 9.62286E-03 ( -0.00121752 0.00120163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.98 using 59 PHA bins.
# Reduced chi-squared = 0.9295 for 57 degrees of freedom
# Null hypothesis probability = 6.265096e-01
Photon flux (15-150 keV) in 1 sec: 1.21624 ( -0.143726 0.143778 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.06637e-08 ( -1.24725e-08 1.26567e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33388 ( -0.993963 0.407562 )
Epeak [keV] : 145.588 ( -145.949 -145.949 )
Norm@50keV : 1.25512E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9429 for 56 degrees of freedom
# Null hypothesis probability = 5.965794e-01
Photon flux (15-150 keV) in 1 sec: 1.20793 ( -0.14801 0.14615 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.88249e-08 ( -1.48681e-08 1.40691e-08 ) ergs/cm2
Band function
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.420520 ( 0.288641 0.288641 )
beta : -1.75100 ( 1.74899 0.338144 )
Epeak [keV] : 38.9869 ( -38.9589 121.889 )
Norm@50keV : 0.191462 ( -0.196487 361.703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.28 using 59 PHA bins.
# Reduced chi-squared = 0.9324 for 55 degrees of freedom
# Null hypothesis probability = 6.173940e-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] : 12.6342 (-1.74075 2.09528)
R^2/D10^2 : 0.253395 (-0.107272 0.177462)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.99 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.716090e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.578e-09 1.816e-09
25- 50 2.863e-08 5.035e-09
50-150 2.840e-08 7.295e-09
15-150 6.561e-08 1.054e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 196.712 (-90.2376 -196.813)
Norm : 4.97020 (-0.585064 0.662456)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.75 using 59 PHA bins.
# Reduced chi-squared = 0.9254 for 57 degrees of freedom
# Null hypothesis probability = 6.351690e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.240e-08 6.900e-09
25- 50 2.381e-08 1.292e-08
50-150 5.199e-08 2.830e-08
15-150 8.820e-08 4.849e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.90807 (-2.5808 1.58415)
R1^2/D10^2 : 0.531162 (-0.225673 0.764267)
kT2 [keV] : 199.067 (-170.909 -199.124)
R2^2/D10^2 : 1.44073E-04 (-7.15849e-05 0.0116239)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.68 using 59 PHA bins.
# Reduced chi-squared = 0.9033 for 55 degrees of freedom
# Null hypothesis probability = 6.773061e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.077e-08 2.940e-09
25- 50 2.754e-08 7.270e-09
50-150 5.127e-08 1.765e-08
15-150 8.958e-08 2.585e-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: 1.66010 ( -0.209324 0.216476 )
Norm@50keV : 7.42670E-03 ( -0.00100568 0.000985353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.88 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.758412e-01
Photon flux (15-150 keV) in 1.472 sec: 0.972999 ( -0.116326 0.116348 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01572e-07 ( -1.45028e-08 1.47703e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43176 ( -1.07343 0.434723 )
Epeak [keV] : 111.293 ( -105.958 -112.321 )
Norm@50keV : 9.95581E-03 ( -0.00606663 0.02912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.71 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 56 degrees of freedom
# Null hypothesis probability = 2.505629e-01
Photon flux (15-150 keV) in 1.472 sec: 0.965298 ( -0.120865 0.119252 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92384e-08 ( -1.73826e-08 1.66454e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10340 ( 1.07291 1.07291 )
beta : -1.87553 ( 1.88794 0.407828 )
Epeak [keV] : 64.1909 ( -62.7676 211.383 )
Norm@50keV : 1.57917E-02 ( -0.00964642 707.565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.18 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.357524e-01
Photon flux (15-150 keV) in 1.472 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84023e-08 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.70e-08
S(50-100 keV) = 3.42e-08
T90 vs. Hardness ratio plot
T90 = 1.28000003099442 sec.
Hardness ratio (energy fluence ratio) = 1.26667
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.27954
Count Ratio (50-100 keV) / (15-25 keV) = 0.725326
Mask shadow pattern
IMX = -1.089985465655456E-01, IMY = -3.221998356877339E-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:
-239.520000 -0.352000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
233.0926 -10.5640 2.2 41.2 63.9 3.0668 5.4 ------ UNKNOWN
182.8025 -57.4932 2.4 50.4 152.4 3.3696 4.7 ------ UNKNOWN
200.5507 -33.2061 3.1 27.0 129.5 0.7883 3.7 ------ UNKNOWN
231.6355 24.5618 2.6 50.6 15.8 2.1398 4.5 ------ UNKNOWN
227.7106 36.1780 2.5 55.4 1.8 2.9688 4.6 ------ UNKNOWN
207.1651 20.5154 2.8 32.0 -5.1 0.8027 4.1 ------ UNKNOWN
199.2841 28.6414 2.2 36.9 -22.2 1.0903 5.1 ------ UNKNOWN
167.4939 3.4485 2.9 26.3 -99.8 0.8485 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.352000 1.120000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
209.5445 -50.3269 2.2 45.4 130.3 0.2636 5.2 ------ UNKNOWN
218.4166 -29.9932 2.8 33.8 101.6 0.1046 4.2 ------ UNKNOWN
203.7674 -22.1212 0.8 18.8 108.7 0.1903 14.2 ------ UNKNOWN
169.5530 4.1764 2.8 24.8 -96.2 0.0601 4.1 ------ UNKNOWN
145.2290 -16.7045 2.4 46.0 -139.6 0.1266 4.7 ------ UNKNOWN
190.8698 42.8186 2.5 50.3 -34.2 0.1641 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
59.980580 664.727800
665.480000 962.553200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4047 -60.4471 0.0 44.8 177.5 -1.3534 -1.3 10.9 Cen X-3
186.7004 -62.7730 1.2 42.3 166.3 9.5877 10.0 1.2 GX 301-2
244.9796 -15.6340 0.4 39.4 62.8 56.7932 27.2 0.4 Sco X-1
244.3059 9.3814 2.2 50.7 30.8 11.5441 5.2 ------ UNKNOWN
151.7797 -27.4734 2.9 47.2 -132.8 7.6498 4.0 ------ UNKNOWN
146.0524 -31.4753 3.3 51.8 -138.6 9.3394 3.5 ------ UNKNOWN
Plot creation:
Sun May 31 09:26:19 EDT 2015