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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
173.8051 -7.1016 0.0032 24.1816 4.5992 3.6077364 60.671 TRIG_00313954
Foreground time interval of the image:
-5.284 13.069 (delta_t = 18.353 [sec])
Background time interval of the image:
-239.832 -5.284 (delta_t = 234.548 [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 -5.284 sec. to 129.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33212 ( -0.047855 0.0476329 )
Norm@50keV : 4.31470E-03 ( -0.000104787 0.000104732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.61 using 59 PHA bins.
# Reduced chi-squared = 0.9580 for 57 degrees of freedom
# Null hypothesis probability = 5.654444e-01
Photon flux (15-150 keV) in 135.1 sec: 0.517920 ( -0.0139079 0.0139673 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.71649e-06 ( -1.46575e-07 1.46993e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.284 sec. to 129.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32836 ( -0.0861681 0.113779 )
Epeak [keV] : 9998.81 ( )
Norm@50keV : 4.33163E-03 ( -0.0001047 0.000423522 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9766 for 56 degrees of freedom
# Null hypothesis probability = 5.246358e-01
Photon flux (15-150 keV) in 135.1 sec: 0.518253 ( -0.014575 0.013397 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.7152e-06 ( -1.44557e-07 1.45314e-07 ) ergs/cm2
Band function
Time interval is from -5.284 sec. to 129.836 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.939043 ( -1.96029 -1.96029 )
beta : -1.35483 ( -0.0548351 0.054399 )
Epeak [keV] : 32.5437 ( -28.2353 114.049 )
Norm@50keV : 0.203643 ( -0.203195 178.613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9520 for 55 degrees of freedom
# Null hypothesis probability = 5.762252e-01
Photon flux (15-150 keV) in 135.1 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] : 19.0877 ( )
R^2/D10^2 : 2.54954E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 465.98 using 59 PHA bins.
# Reduced chi-squared = 8.1751 for 57 degrees of freedom
# Null hypothesis probability = 1.623923e-65
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.463e-07 1.270e-08
25- 50 1.188e-06 4.593e-08
50-150 3.185e-06 1.236e-07
15-150 4.619e-06 1.290e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.18425 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 142.61 using 59 PHA bins.
# Reduced chi-squared = 2.5020 for 57 degrees of freedom
# Null hypothesis probability = 2.756677e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.348e-07 2.047e-08
25- 50 1.414e-06 3.918e-08
50-150 3.100e-06 8.309e-08
15-150 5.248e-06 1.439e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.80546 (-0.598018 0.640843)
R1^2/D10^2 : 0.357013 (-0.0846414 0.116252)
kT2 [keV] : 34.7005 (-3.1014 3.97725)
R2^2/D10^2 : 3.05394E-03 (-0.000866927 0.00106725)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.95 using 59 PHA bins.
# Reduced chi-squared = 0.7809 for 55 degrees of freedom
# Null hypothesis probability = 8.811218e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.922e-07 4.958e-08
25- 50 1.335e-06 6.937e-08
50-150 3.865e-06 2.297e-07
15-150 5.793e-06 3.013e-07
Peak spectrum fit
Power-law model
Time interval is from 2.228 sec. to 3.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.744502 ( -0.118734 0.115558 )
Norm@50keV : 2.38537E-02 ( -0.00157979 0.00156619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.31 using 59 PHA bins.
# Reduced chi-squared = 0.9528 for 57 degrees of freedom
# Null hypothesis probability = 5.766764e-01
Photon flux (15-150 keV) in 1 sec: 2.74880 ( -0.17532 0.175605 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85467e-07 ( -1.93505e-08 1.94355e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.228 sec. to 3.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.740879 ( -0.122709 0.113758 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.40361E-02 ( -0.00149074 0.0100724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9702 for 56 degrees of freedom
# Null hypothesis probability = 5.382811e-01
Photon flux (15-150 keV) in 1 sec: 2.74983 ( -0.17453 0.17373 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85358e-07 ( -1.9176e-08 1.9191e-08 ) ergs/cm2
Band function
Time interval is from 2.228 sec. to 3.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.885225 ( 0.885226 0.885226 )
beta : -0.744502 ( -0.115456 0.118911 )
Epeak [keV] : 16.5846 ( -16.5846 -16.5846 )
Norm@50keV : 3.31855E-02 ( -0.0119869 506902 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.31 using 59 PHA bins.
# Reduced chi-squared = 0.9874 for 55 degrees of freedom
# Null hypothesis probability = 5.009972e-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] : 27.3384 (-2.58814 3.04818)
R^2/D10^2 : 5.38170E-02 (-0.0140251 0.0181017)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.46 using 59 PHA bins.
# Reduced chi-squared = 1.640 for 57 degrees of freedom
# Null hypothesis probability = 1.660587e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.650e-09 9.080e-10
25- 50 3.940e-08 3.810e-09
50-150 2.144e-07 2.305e-08
15-150 2.605e-07 2.155e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.5582 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 183.93 using 59 PHA bins.
# Reduced chi-squared = 3.2268 for 57 degrees of freedom
# Null hypothesis probability = 2.838457e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.629e-08 2.140e-09
25- 50 5.057e-08 5.570e-09
50-150 1.109e-07 3.421e-08
15-150 1.878e-07 4.400e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1154 (-3.68412 4.38007)
R1^2/D10^2 : 0.533194 (-0.309897 1.50778)
kT2 [keV] : 48.8687 (-14.2112 77.9459)
R2^2/D10^2 : 9.41374E-03 (-0.00758264 0.0154543)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.92 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 55 degrees of freedom
# Null hypothesis probability = 4.033534e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.365e-08 5.444e-09
25- 50 4.614e-08 1.346e-08
50-150 2.298e-07 1.055e-07
15-150 2.896e-07 1.113e-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: 1.04796 ( -0.0490748 0.0486928 )
Norm@50keV : 1.29318E-02 ( -0.000340396 0.000339305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 57 degrees of freedom
# Null hypothesis probability = 4.916769e-01
Photon flux (15-150 keV) in 18.35 sec: 1.49336 ( -0.0409422 0.0410534 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52379e-06 ( -6.82247e-08 6.83523e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04137 ( -0.0486408 0.0498981 )
Epeak [keV] : 9997.27 ( -9998.02 -9998.02 )
Norm@50keV : 1.30028E-02 ( -0.000335014 0.0013515 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.501918e-01
Photon flux (15-150 keV) in 18.35 sec: 1.49273 ( -0.04093 0.04099 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53254e-06 ( -8.02262e-08 6.40599e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.60211 ( -9.09817 -3.60211 )
beta : -1.07882 ( -0.0569277 0.0552094 )
Epeak [keV] : 28.7294 ( -5.69774 48.1144 )
Norm@50keV : 43.7831 ( -43.7831 155.279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.10 using 59 PHA bins.
# Reduced chi-squared = 0.9472 for 55 degrees of freedom
# Null hypothesis probability = 5.862806e-01
Photon flux (15-150 keV) in 18.35 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) = 1.30e-06
S(50-100 keV) = 2.06e-06
T90 vs. Hardness ratio plot
T90 = 79.4480000138283 sec.
Hardness ratio (energy fluence ratio) = 1.58462
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.52635
Count Ratio (50-100 keV) / (15-25 keV) = 1.27837
Mask shadow pattern
IMX = 4.475861496632544E-01, IMY = -3.600562921280936E-02
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:
-239.832000 -5.284000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5262 -40.5481 0.4 23.9 -163.0 4.7210 25.9 0.4 Vela X-1
170.4539 -60.6026 2.5 34.4 138.0 1.4653 4.6 4.2 Cen X-3
186.6113 -62.7166 7.2 39.9 128.5 0.8148 1.6 3.5 GX 301-2
193.3668 -31.7757 2.4 29.8 74.9 1.4103 4.9 ------ UNKNOWN
169.8290 -24.6541 2.4 9.7 45.6 0.7685 4.9 ------ UNKNOWN
183.5003 7.1500 2.5 41.4 5.3 1.2945 4.6 ------ UNKNOWN
86.2651 -49.6195 3.5 59.1 -166.2 4.2633 3.3 ------ UNKNOWN
138.3801 7.2071 2.4 39.8 -66.2 2.7638 4.9 ------ UNKNOWN
95.0508 -32.7315 4.9 55.2 -145.1 2.8397 2.4 ------ UNKNOWN
145.5851 19.3666 2.9 48.3 -50.0 3.9908 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-5.284000 13.068600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4289 -40.5961 2.6 24.0 -163.0 -0.2312 -4.4 5.2 Vela X-1
169.9036 -60.6996 0.0 34.4 138.5 0.1280 1.3 13.0 Cen X-3
186.6276 -62.6391 5.4 39.8 128.4 -0.3118 -2.1 7.9 GX 301-2
184.1285 -73.9759 2.2 48.7 138.7 1.3279 5.2 ------ UNKNOWN
197.0017 12.0616 2.0 53.5 15.5 1.4076 5.9 ------ UNKNOWN
173.8051 -7.1016 0.2 24.2 4.6 3.6078 60.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
58.668600 962.203800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5348 -40.5506 0.7 47.8 -163.3 16.8993 16.3 0.4 Vela X-1
170.5251 -60.6502 5.9 53.6 159.2 5.1779 1.9 6.4 Cen X-3
198.2218 -41.4579 2.9 40.6 128.8 5.0031 4.0 ------ UNKNOWN
194.6408 29.0729 3.3 41.4 5.3 2.3605 3.5 ------ UNKNOWN
151.9474 39.4633 4.2 50.8 -44.5 7.9730 2.8 ------ UNKNOWN
125.3444 -17.4977 3.0 48.3 -129.9 7.6147 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 07:14:33 EDT 2015