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
128.6328 -59.1609 0.0106 34.4690 -71.9309 2.7005786 18.205 TRIG_00617110
Foreground time interval of the image:
-18.424 28.277 (delta_t = 46.701 [sec])
Background time interval of the image:
-524.123 -507.849 (delta_t = 16.275 [sec])
-239.424 -18.424 (delta_t = 221.000 [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 2.048000
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 2.048000
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 2.048000
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
Multiple GTIs in the spectrum
tstart tstop
-18.424000 839.295900
840.576000 893.576000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29583 ( -0.184339 0.181508 )
Norm@50keV : 3.82611E-04 ( -3.84356e-05 3.84352e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.40 using 59 PHA bins.
# Reduced chi-squared = 0.9894 for 57 degrees of freedom
# Null hypothesis probability = 4.975976e-01
Photon flux (15-150 keV) in 910.7 sec: 4.56115E-02 ( -0.0048077 0.0048261 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44676e-06 ( -3.78742e-07 3.81061e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-18.424000 839.295900
840.576000 893.576000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29748 ( -0.588787 0.1792 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.83539E-04 ( -0.000383958 0.000319526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.41 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 56 degrees of freedom
# Null hypothesis probability = 4.596311e-01
Photon flux (15-150 keV) in 910.7 sec: 4.56277E-02 ( -0.004821 0.004757 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44701e-06 ( -3.85417e-07 3.77813e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-18.424000 839.295900
840.576000 893.576000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.980517 ( 0.985649 0.985649 )
beta : -1.29816 ( 1.29792 0.186751 )
Epeak [keV] : 69.8630 ( -76.6264 -76.6264 )
Norm@50keV : 6.85069E-04 ( -0.00029737 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.40 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.221907e-01
Photon flux (15-150 keV) in 910.7 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] : 19.4454 (-2.71674 3.28755)
R^2/D10^2 : 2.18026E-03 (-0.000875558 0.00143464)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.98 using 59 PHA bins.
# Reduced chi-squared = 1.491 for 57 degrees of freedom
# Null hypothesis probability = 9.536929e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.463e-07 3.438e-08
25- 50 7.152e-07 1.365e-07
50-150 1.996e-06 3.775e-07
15-150 2.857e-06 4.253e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.190334 (-0.0193732 0.0193712)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.22 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.660811e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.316e-07 9.125e-08
25- 50 8.302e-07 3.320e-07
50-150 1.821e-06 9.886e-07
15-150 3.083e-06 1.638e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.41421 (-1.69017 2.16933)
R1^2/D10^2 : 6.05287E-02 (-0.0389915 0.140495)
kT2 [keV] : 30.4060 (-6.49116 12.5936)
R2^2/D10^2 : 4.42114E-04 (-0.000288247 0.000538054)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.61 using 59 PHA bins.
# Reduced chi-squared = 0.9929 for 55 degrees of freedom
# Null hypothesis probability = 4.894547e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.874e-07 1.884e-07
25- 50 7.371e-07 2.838e-07
50-150 2.372e-06 1.023e-06
15-150 3.497e-06 1.359e-06
Peak spectrum fit
Power-law model
Time interval is from 5.076 sec. to 6.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39403 ( -0.847313 0.80681 )
Norm@50keV : 5.02837E-03 ( -0.00203113 0.00201007 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.424453e-01
Photon flux (15-150 keV) in 1 sec: 0.611530 ( -0.256771 0.259242 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86452e-08 ( -2.11049e-08 2.12506e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.076 sec. to 6.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.39864 ( )
Epeak [keV] : 368.189 ( )
Norm@50keV : 5.13691E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.74 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 56 degrees of freedom
# Null hypothesis probability = 4.108908e-01
Photon flux (15-150 keV) in 1 sec: 0.618831 ( -0.266445 0.252685 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84487e-08 ( -2.08823e-08 2.11053e-08 ) ergs/cm2
Band function
Time interval is from 5.076 sec. to 6.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03991 ( 1.037 1.037 )
beta : -1.38923 ( 1.39783 0.851116 )
Epeak [keV] : 57.4806 ( -58.5303 -58.5303 )
Norm@50keV : 9.68083E-03 ( -0.0097478 596619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.693665e-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] : 17.2012 ( )
R^2/D10^2 : 4.08129E-02 (-0.0397006 1.19085)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.95 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.039633e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.830e-09 1.963e-09
25- 50 1.175e-08 7.615e-09
50-150 2.024e-08 1.350e-08
15-150 3.482e-08 2.409e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-199.363 -199.363)
Norm : 2.52991 (-1.02629 1.02633)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.40 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.237062e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.300e-09 4.126e-09
25- 50 1.212e-08 7.860e-09
50-150 2.658e-08 1.775e-08
15-150 4.500e-08 2.868e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.36679 (-4.64709 8.84229)
R1^2/D10^2 : 0.686846 ( )
kT2 [keV] : 65.2633 (-65.5088 -65.5089)
R2^2/D10^2 : 7.11462E-04 (-0.000667976 0.0293895)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.19 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 55 degrees of freedom
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.938053e-01
# Null hypothesis probability = 3.969959e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.641e-09 4.487e-09
25- 50 1.077e-08 7.315e-09
50-150 3.105e-08 2.033e-08
15-150 4.846e-08 2.646e-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: 1.20662 ( -0.138529 0.135928 )
Norm@50keV : 4.06970E-03 ( -0.000313543 0.000312744 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.879946e-01
Photon flux (15-150 keV) in 46.7 sec: 0.478151 ( -0.0390136 0.0391904 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92459e-06 ( -1.56508e-07 1.57195e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20206 ( -0.479563 0.170527 )
Epeak [keV] : 9994.15 ( )
Norm@50keV : 4.08923E-03 ( -0.000312185 0.00324015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 56 degrees of freedom
# Null hypothesis probability = 1.643079e-01
Photon flux (15-150 keV) in 46.7 sec: 0.476818 ( -0.040233 0.040033 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92045e-06 ( -1.63095e-07 1.61059e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.694740 ( 0.664184 5.3409 )
beta : -1.24407 ( 1.24683 0.171925 )
Epeak [keV] : 86.6808 ( -79.1435 294.873 )
Norm@50keV : 8.50762E-03 ( -0.0058045 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.99 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 55 degrees of freedom
# Null hypothesis probability = 1.473347e-01
Photon flux (15-150 keV) in 46.7 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) = 7.65e-07
S(50-100 keV) = 1.25e-06
T90 vs. Hardness ratio plot
T90 = 464 sec.
Hardness ratio (energy fluence ratio) = 1.63399
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.27133
Count Ratio (50-100 keV) / (15-25 keV) = 1.162
Mask shadow pattern
IMX = 2.129235424054261E-01, IMY = 6.526302976132271E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-524.123400 -507.848900
-239.424000 -18.424000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5239 -40.5250 1.1 34.4 -106.1 4.2251 10.3 1.8 Vela X-1
45.7091 -27.4563 2.6 40.4 46.6 2.2915 4.5 ------ UNKNOWN
73.8752 -83.8073 2.8 50.1 -37.1 2.7248 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-18.424000 28.276600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5921 -40.6061 7.1 34.5 -106.0 -0.2518 -1.6 4.2 Vela X-1
104.9149 -6.5209 2.8 29.9 165.6 0.3759 4.1 ------ UNKNOWN
83.5872 -60.5731 2.8 27.1 -30.0 0.3408 4.1 ------ UNKNOWN
128.3690 -8.7312 2.0 41.5 -158.9 0.7241 5.9 ------ UNKNOWN
128.6329 -59.1609 0.6 34.5 -71.9 2.7000 18.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
83.076600 839.295900
840.576000 962.640700
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5187 -40.5633 0.8 19.1 -168.2 7.7641 14.6 0.7 Vela X-1
170.6162 -60.6953 4.9 20.8 -72.1 1.5219 2.4 9.8 Cen X-3
186.6597 -62.7691 2.9 27.5 -61.9 2.8753 3.9 0.1 GX 301-2
12.8548 -59.6065 4.4 51.1 31.3 11.4035 2.6 ------ UNKNOWN
62.0745 -77.2277 2.5 28.0 21.0 2.7397 4.7 ------ UNKNOWN
126.8293 -34.1001 2.7 25.1 172.1 2.7057 4.3 ------ UNKNOWN
131.8687 -3.3778 3.3 55.8 179.5 9.5852 3.5 ------ UNKNOWN
128.6262 -59.1466 2.1 0.0 -109.4 2.6948 5.4 ------ UNKNOWN
133.7369 -27.1629 2.4 32.2 -175.9 2.8833 4.8 ------ UNKNOWN
152.4910 -58.2937 0.9 12.4 -88.2 6.5312 12.3 ------ UNKNOWN
Plot creation:
Thu May 28 14:05:02 EDT 2015