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
58.1172 -55.9368 0.0234 28.5296 -84.0735 0.4341060 8.197 TRIG_00299787
Foreground time interval of the image:
-0.144 16.197 (delta_t = 16.341 [sec])
Background time interval of the image:
-239.504 -0.144 (delta_t = 239.360 [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 -0.144 sec. to 150.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01077 ( -0.338226 0.376067 )
Norm@50keV : 3.55171E-04 ( -9.36572e-05 9.10167e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9446 for 57 degrees of freedom
# Null hypothesis probability = 5.942644e-01
Photon flux (15-150 keV) in 150.7 sec: 5.35413E-02 ( -0.0103559 0.0103599 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93898e-07 ( -1.18576e-07 1.24932e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 150.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.201305 ( -3.32482 1.80164 )
Epeak [keV] : 35.4717 ( -34.9781 -35.4068 )
Norm@50keV : 4.99955E-03 ( -0.00531832 0.878566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.49 using 59 PHA bins.
# Reduced chi-squared = 0.9195 for 56 degrees of freedom
# Null hypothesis probability = 6.459318e-01
Photon flux (15-150 keV) in 150.7 sec: 5.10616E-02 ( -0.0102907 0.0100045 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0439e-07 ( -1.06019e-07 1.51815e-07 ) ergs/cm2
Band function
Time interval is from -0.144 sec. to 150.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91877 ( -6.49056 -4.91877 )
beta : -2.55958 ( -1.15365 0.569356 )
Epeak [keV] : 26.4360 ( -6.40797 5.04892 )
Norm@50keV : 40.0828 ( -7.53866 227.045 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.91 using 59 PHA bins.
# Reduced chi-squared = 0.9075 for 55 degrees of freedom
# Null hypothesis probability = 6.688027e-01
Photon flux (15-150 keV) in 150.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.5336e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.69920 (-1.57872 1.96391)
R^2/D10^2 : 4.46219E-02 (-0.0244958 0.0521785)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9220 for 57 degrees of freedom
# Null hypothesis probability = 6.424592e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.725e-08 3.409e-08
25- 50 1.958e-07 6.236e-08
50-150 6.726e-08 3.618e-08
15-150 3.604e-07 1.316e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.7694 (-23.0494 56.184)
Norm : 0.294206 (-0.0816816 0.115545)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9158 for 57 degrees of freedom
# Null hypothesis probability = 6.552635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.100e-07 2.999e-08
25- 50 1.636e-07 4.873e-08
50-150 1.749e-07 1.010e-07
15-150 4.485e-07 1.667e-07
Double BB
R1^2/D10^2 : 5.59680E-02 ( )
kT2 [keV] : 197.084 ( )
R2^2/D10^2 : 3.41321E-06 (-3.41321e-06 0.0640974)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.66 using 59 PHA bins.
#Fit statistic : Chi-Squared = 50.47 using 59 PHA bins.
#Fit statistic : Chi-Squared = 50.44 using 59 PHA bins.
# Reduced chi-squared = 0.9211 for 55 degrees of freedom
# Reduced chi-squared = 0.9176 for 55 degrees of freedom
# Reduced chi-squared = 0.9171 for 55 degrees of freedom
# Null hypothesis probability = 6.410379e-01
# Null hypothesis probability = 6.482789e-01
# Null hypothesis probability = 6.492254e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.064e-07 6.482e-08
25- 50 1.785e-07 1.057e-07
50-150 1.583e-07 1.042e-07
15-150 4.433e-07 2.367e-07
Peak spectrum fit
Power-law model
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.980479 ( -0.254928 0.241952 )
Norm@50keV : 1.38905E-02 ( -0.00180927 0.00180016 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.46 using 59 PHA bins.
# Reduced chi-squared = 0.9379 for 57 degrees of freedom
# Null hypothesis probability = 6.086274e-01
Photon flux (15-150 keV) in 1 sec: 1.59774 ( -0.210616 0.211048 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51264e-07 ( -2.18473e-08 2.20142e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.990012 ( -0.411911 0.230233 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.39884E-02 ( -0.0139857 0.00601767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.51 using 59 PHA bins.
# Reduced chi-squared = 0.9555 for 56 degrees of freedom
# Null hypothesis probability = 5.696805e-01
Photon flux (15-150 keV) in 1 sec: 1.60188 ( -0.21076 0.20716 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51534e-07 ( -2.1825e-08 2.0713e-08 ) ergs/cm2
Band function
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99999 -4.99999 )
beta : -1.04911 ( -0.289231 0.283296 )
Epeak [keV] : 27.1801 ( -27.1801 8.22279 )
Norm@50keV : 581.374 ( -74.4017 2.89293e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9635 for 55 degrees of freedom
# Null hypothesis probability = 5.516002e-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] : 26.2690 (-6.31798 9.02342)
R^2/D10^2 : 3.19134E-02 (-0.0315459 0.0410281)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.85 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.466890e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.724e-09 1.169e-09
25- 50 2.165e-08 5.670e-09
50-150 1.098e-07 2.795e-08
15-150 1.352e-07 3.171e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.40586 (-0.864533 0.864514)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.59 using 59 PHA bins.
# Reduced chi-squared = 1.221 for 57 degrees of freedom
# Null hypothesis probability = 1.224007e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.595e-08 9.045e-09
25- 50 3.069e-08 1.709e-08
50-150 6.731e-08 3.780e-08
15-150 1.139e-07 6.260e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.88434 (-1.77082 1.84711)
R1^2/D10^2 : 1.07791 (-0.624504 1.5403)
kT2 [keV] : 62.9888 (-24.3872 -63.1846)
R2^2/D10^2 : 2.87322E-03 (-0.00244565 0.00637171)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.99 using 59 PHA bins.
# Reduced chi-squared = 0.8361 for 55 degrees of freedom
# Null hypothesis probability = 8.014526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.302e-08 6.900e-09
25- 50 2.827e-08 1.268e-08
50-150 1.219e-07 6.553e-08
15-150 1.632e-07 8.209e-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: 1.33461 ( -0.331526 0.325495 )
Norm@50keV : 1.86644E-03 ( -0.000356384 0.000355303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.48 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.586652e-01
Photon flux (15-150 keV) in 16.34 sec: 0.224152 ( -0.0433118 0.0434167 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98908e-07 ( -6.29946e-08 6.40835e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09487 ( )
Epeak [keV] : 187.836 ( )
Norm@50keV : 2.47822E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.36 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 56 degrees of freedom
# Null hypothesis probability = 2.329710e-01
Photon flux (15-150 keV) in 16.34 sec: 0.222214 ( -0.044309 0.044226 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93176e-07 ( -7.03878e-08 6.83421e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92523 ( -4.92523 -4.92523 )
beta : -1.55645 ( -0.481681 0.412713 )
Epeak [keV] : 29.3104 ( -29.3104 8.90188 )
Norm@50keV : 62.9426 ( -11.7416 686940 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.37 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.582508e-01
Photon flux (15-150 keV) in 16.34 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) = 1.49e-07
S(50-100 keV) = 1.48e-07
T90 vs. Hardness ratio plot
T90 = 142.480000019073 sec.
Hardness ratio (energy fluence ratio) = 0.993289
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.0271
Count Ratio (50-100 keV) / (15-25 keV) = 0.365247
Mask shadow pattern
IMX = 5.613099150980396E-02, IMY = 5.407194386117098E-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:
-239.504000 -0.144000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3208 -40.5207 6.7 42.6 -176.6 -0.4387 -1.7 9.7 Vela X-1
150.3717 -34.3235 2.5 55.6 179.0 3.1399 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.144000 16.196600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.3534 -40.4696 17.7 42.6 -176.7 -0.0397 -0.6 9.5 Vela X-1
124.0725 -10.0562 2.3 44.6 136.3 0.6785 5.0 ------ UNKNOWN
58.1172 -55.9367 1.4 28.5 -84.1 0.4341 8.2 ------ UNKNOWN
68.5183 -64.5613 2.3 32.8 -101.9 0.3208 5.1 ------ UNKNOWN
156.8187 -63.4458 3.3 54.2 -144.9 0.6604 3.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
65.996600 811.396600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4622 -40.4848 5.1 50.9 162.5 2.9275 2.2 5.2 Vela X-1
170.3895 -60.6771 3.8 51.8 -159.6 -3.0824 -3.0 3.9 Cen X-3
186.4499 -62.8348 13.3 54.6 -150.5 -1.4187 -0.9 6.9 GX 301-2
36.6609 -15.3308 2.7 43.8 24.9 3.4368 4.3 ------ UNKNOWN
78.2256 -38.6171 2.6 21.9 101.7 1.8001 4.4 ------ UNKNOWN
30.5824 -41.6804 3.6 22.8 -7.4 1.1831 3.2 ------ UNKNOWN
1.4180 -18.3898 3.1 56.4 -16.6 5.8250 3.7 ------ UNKNOWN
269.7577 -78.9401 2.4 43.8 -116.0 9.7592 4.7 ------ UNKNOWN
Plot creation:
Sun May 31 08:32:10 EDT 2015