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
197.0151 -75.6198 0.0175 11.3666 -111.6752 1.1913723 10.964 TRIG_00349592
Foreground time interval of the image:
-1.976 74.301 (delta_t = 76.277 [sec])
Background time interval of the image:
-135.299 -1.976 (delta_t = 133.323 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -1.976 sec. to 525.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35159 ( -0.158213 0.157066 )
Norm@50keV : 5.18990E-04 ( -4.38091e-05 4.3665e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.16 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.690213e-01
Photon flux (15-150 keV) in 527.4 sec: 6.25438E-02 ( -0.00537652 0.00539535 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67237e-06 ( -2.53711e-07 2.56141e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.976 sec. to 525.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14445 ( -0.216301 0.159405 )
Epeak [keV] : 52.8804 ( -9999.36 -9999.36 )
Norm@50keV : 1.88057E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.503916e-01
Photon flux (15-150 keV) in 527.4 sec: 6.25957E-02 ( -0.0054561 0.005323 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66848e-06 ( -2.4993e-07 2.54323e-07 ) ergs/cm2
Band function
Time interval is from -1.976 sec. to 525.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02680 ( 1.02488 1.02488 )
beta : -1.35291 ( 1.35271 0.15927 )
Epeak [keV] : 55.8137 ( -56.1701 -56.1701 )
Norm@50keV : 9.91191E-04 ( -0.000410883 43303.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.16 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Null hypothesis probability = 3.950054e-01
Photon flux (15-150 keV) in 527.4 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] : 16.8971 (-2.08997 2.50608)
R^2/D10^2 : 4.64008E-03 (-0.00171327 0.00264762)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.45 using 59 PHA bins.
# Reduced chi-squared = 1.7622 for 57 degrees of freedom
# Null hypothesis probability = 3.385074e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.425e-07 2.845e-08
25- 50 6.276e-07 8.404e-08
50-150 1.277e-06 1.967e-07
15-150 2.047e-06 2.239e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.257643 (-0.0216833 0.0216817)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.47 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.590770e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.384e-07 3.539e-08
25- 50 6.510e-07 1.657e-07
50-150 1.428e-06 5.259e-07
15-150 2.417e-06 9.517e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.42901 (-2.06246 2.23611)
R1^2/D10^2 : 5.29357E-02 (-0.0302215 0.113664)
kT2 [keV] : 34.6718 (-9.74691 26.7794)
R2^2/D10^2 : 3.74631E-04 (-0.000292537 0.000723071)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.72 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 3.406881e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.961e-07 1.106e-07
25- 50 6.224e-07 1.970e-07
50-150 1.827e-06 9.280e-07
15-150 2.746e-06 9.870e-07
Peak spectrum fit
Power-law model
Time interval is from 319.264 sec. to 320.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.210968 ( -1.43584 0.970375 )
Norm@50keV : 2.25074E-03 ( -0.00224614 0.00129648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.248049e-01
Photon flux (15-150 keV) in 1 sec: 0.283908 6.06927E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53895e-08 ( -1.20282e-08 1.19575e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 319.264 sec. to 320.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.217060 ( -1.47444 0.869558 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 2.29473E-03 ( -0.00229408 -0.00229408 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.76 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 56 degrees of freedom
# Null hypothesis probability = 1.975938e-01
Photon flux (15-150 keV) in 1 sec: 0.292447 5.29100E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53765e-08 ( -1.20249e-08 1.18598e-08 ) ergs/cm2
Band function
Time interval is from 319.264 sec. to 320.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.679610 ( 0.676524 0.676524 )
beta : -0.217786 ( -0.970024 1.28147 )
Epeak [keV] : 12.9291 ( -12.8796 -12.8796 )
Norm@50keV : 3.73025E-03 ( -0.00372309 147729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Null hypothesis probability = 1.732434e-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] : 68.3494 ( )
R^2/D10^2 : 6.86550E-04 (-0.000686587 0.00341717)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.58 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.037356e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.550e-09 2.305e-09
25- 50 3.996e-09 2.987e-09
50-150 4.596e-10 4.869e-10
15-150 8.006e-09 5.430e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.358 (-108.866 -199.362)
Norm : 1.25886 (-0.489228 0.489221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.99 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 57 degrees of freedom
# Null hypothesis probability = 1.006394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.135e-09 2.046e-09
25- 50 6.030e-09 3.930e-09
50-150 1.322e-08 8.545e-09
15-150 2.239e-08 1.450e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.94186 (-3.9706 3.60609)
R1^2/D10^2 : 1.48714 (-1.33247 379.571)
kT2 [keV] : 110.950 (-61.326 -99.92)
R2^2/D10^2 : 2.75363E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.71 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.70 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.083875e-01
# Null hypothesis probability = 3.087555e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.556e-09 2.270e-09
25- 50 3.740e-09 2.135e-09
50-150 3.163e-08 2.810e-08
15-150 3.892e-08 3.457e-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: 1.30974 ( -0.229172 0.227436 )
Norm@50keV : 9.65522E-04 ( -0.000116785 0.00011656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9753 for 57 degrees of freedom
# Null hypothesis probability = 5.281211e-01
Photon flux (15-150 keV) in 76.28 sec: 0.115399 ( -0.0142366 0.0142809 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.2608e-07 ( -9.94478e-08 1.00809e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30610 ( -0.717132 2.09883 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 9.69468E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9928 for 56 degrees of freedom
# Null hypothesis probability = 4.901568e-01
Photon flux (15-150 keV) in 76.28 sec: 0.115443 ( -0.014518 0.014175 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.25903e-07 ( -1.01758e-07 9.98505e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09074 ( 1.09074 1.09074 )
beta : -1.30973 ( 1.30973 0.22965 )
Epeak [keV] : 31.1326 ( -31.1298 -31.1298 )
Norm@50keV : 1.82107E-03 ( -0.000971237 0.147081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.523950e-01
Photon flux (15-150 keV) in 76.28 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) = 6.12e-07
S(50-100 keV) = 9.59e-07
T90 vs. Hardness ratio plot
T90 = 454.244000017643 sec.
Hardness ratio (energy fluence ratio) = 1.56699
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.17211
Count Ratio (50-100 keV) / (15-25 keV) = 1.05956
Mask shadow pattern
IMX = -7.424900975963036E-02, IMY = 1.868148118414339E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-135.299400 -1.976000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5156 -40.5664 2.8 38.5 1.1 0.8197 4.1 0.9 Vela X-1
170.3632 -60.4684 5.4 9.3 6.5 0.2493 2.2 9.4 Cen X-3
186.6433 -62.7618 0.5 2.0 51.7 3.0738 23.4 0.6 GX 301-2
256.0380 -37.9474 15.1 46.7 168.1 0.2319 0.8 6.7 4U 1700-377
256.5319 -36.4857 8.5 48.2 167.4 -0.4971 -1.4 6.0 GX 349+2
264.7148 -44.4453 7.7 45.1 -179.3 0.3714 1.5 1.2 4U 1735-44
263.0890 -33.7108 7.1 53.3 171.5 0.9094 1.6 8.9 GX 354-0
127.1247 -29.6107 3.0 51.4 0.8 1.5063 3.8 ------ UNKNOWN
285.4125 -51.3738 3.6 47.6 -158.2 0.8224 3.3 ------ UNKNOWN
77.6172 -60.4481 3.3 44.8 -60.3 2.4395 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.976000 74.300610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6214 -40.4919 4.8 38.5 1.3 -0.3933 -2.4 5.7 Vela X-1
170.0055 -60.5905 4.6 9.4 5.3 0.2864 2.5 9.3 Cen X-3
186.6197 -62.7644 0.9 2.0 51.4 1.3910 12.7 1.1 GX 301-2
255.9110 -37.7569 6.6 46.8 167.8 -0.4408 -1.8 6.3 4U 1700-377
256.4800 -36.4301 4.3 48.2 167.4 0.7784 2.7 2.2 GX 349+2
264.9505 -44.3714 6.0 45.2 -179.2 0.4021 1.9 10.1 4U 1735-44
263.0333 -33.9276 45.2 53.1 171.6 0.1088 0.3 6.0 GX 354-0
226.6743 -26.2534 2.2 45.3 129.8 2.6308 5.2 ------ UNKNOWN
244.4675 -26.7175 1.8 51.6 149.4 3.7815 6.3 ------ UNKNOWN
197.0151 -75.6197 1.1 11.4 -111.7 1.1911 10.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
108.300580 963.050400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5561 -40.5272 1.8 43.9 4.6 5.5532 6.3 2.1 Vela X-1
170.3357 -60.6114 2.6 17.6 32.1 2.3019 4.3 0.9 Cen X-3
186.6636 -62.7672 0.3 13.3 57.9 24.2306 43.1 0.3 GX 301-2
256.1079 -37.9234 8.9 45.9 149.3 2.3222 1.3 7.5 4U 1700-377
256.5763 -36.4821 3.6 47.4 149.2 6.3300 3.2 7.7 GX 349+2
264.7534 -44.2775 0.0 42.0 161.1 1.6231 1.3 10.4 4U 1735-44
262.8596 -33.9097 8.7 51.3 154.7 3.1355 1.3 7.9 GX 354-0
197.0960 -75.6075 1.9 0.0 -167.0 3.4490 6.1 ------ UNKNOWN
306.2786 -36.4538 3.3 59.4 -163.2 19.6788 3.5 ------ UNKNOWN
77.9893 -51.4277 4.5 47.0 -53.1 7.7596 2.6 ------ UNKNOWN
Plot creation:
Sat Jun 20 17:14:51 EDT 2015