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
328.0799 -33.8179 0.0206 42.6960 -28.7501 0.2867987 9.296 TRIG_00337115
Foreground time interval of the image:
-1.080 2.752 (delta_t = 3.832 [sec])
Background time interval of the image:
-207.915 -1.080 (delta_t = 206.835 [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
Time interval is from -1.080 sec. to 2.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23137 ( -0.364514 0.416454 )
Norm@50keV : 3.59724E-03 ( -0.00103818 0.00100439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.42 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 57 degrees of freedom
# Null hypothesis probability = 1.841192e-01
Photon flux (15-150 keV) in 3.832 sec: 0.605531 ( -0.119341 0.119341 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30206e-07 ( -3.10873e-08 3.26e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.080 sec. to 2.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51356 ( -3.52692 0.573629 )
Epeak [keV] : 24.7289 ( )
Norm@50keV : 1.02110E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 56 degrees of freedom
# Null hypothesis probability = 1.726654e-01
Photon flux (15-150 keV) in 3.832 sec: 0.594482 ( -0.122134 0.121853 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20024e-07 ( -3.60396e-08 3.91481e-08 ) ergs/cm2
Band function
Time interval is from -1.080 sec. to 2.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.54426 ( -1.82824 1.81364 )
beta : -2.82501 ( 9.3715 19.3715 )
Epeak [keV] : 26.4208 ( -11.373 34.5605 )
Norm@50keV : 9.15386 ( -9.12541 252.138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.10 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.876040e-01
Photon flux (15-150 keV) in 3.832 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19403e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.46897 (-1.4717 1.91892)
R^2/D10^2 : 0.889286 (-0.538692 1.30039)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.36 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.440809e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.251e-08 1.239e-08
25- 50 5.032e-08 2.014e-08
50-150 1.048e-08 6.483e-09
15-150 9.331e-08 3.510e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.4140 (-17.2474 37.7523)
Norm : 3.80208 (-1.20768 1.99046)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.973512e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.409e-08 9.105e-09
25- 50 4.598e-08 1.381e-08
50-150 3.788e-08 2.004e-08
15-150 1.179e-07 3.499e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17504 (-1.87686 1.94138)
R1^2/D10^2 : 1.67362 (-0.838229 4.4491)
kT2 [keV] : 26.1389 (-15.5271 -26.0496)
R2^2/D10^2 : 3.52056E-03 (-0.0035517 0.138298)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.79 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 55 degrees of freedom
# Null hypothesis probability = 1.949268e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.539e-08 2.077e-08
25- 50 4.495e-08 2.516e-08
50-150 4.927e-08 2.943e-08
15-150 1.296e-07 6.750e-08
Peak spectrum fit
Power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63426 ( -0.433065 0.445715 )
Norm@50keV : 6.27894E-03 ( -0.00179067 0.00176506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.55 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.858066e-01
Photon flux (15-150 keV) in 1 sec: 0.815664 ( -0.225873 0.226818 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8494e-08 ( -1.7214e-08 1.76068e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.217606 ( -3.00769 1.86981 )
Epeak [keV] : 56.9169 ( -13.4544 -56.917 )
Norm@50keV : 3.74553E-02 ( -0.0374413 2.06413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.030331e-01
Photon flux (15-150 keV) in 1 sec: 0.787046 ( -0.226772 0.229584 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.2811e-08 ( -1.75929e-08 1.92389e-08 ) ergs/cm2
Band function
Time interval is from 0.192 sec. to 1.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98292 ( -14.5085 -4.98292 )
beta : -2.19566 ( -1.12387 0.65639 )
Epeak [keV] : 32.1192 ( -12.3167 8.14559 )
Norm@50keV : 181.102 ( -46.7564 977.919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.70 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.413524e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.55811e-08 ( -5.55741e-08 -1.68738e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6162 (-3.40672 4.78863)
R^2/D10^2 : 0.177419 (-0.124522 0.387372)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.24 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.950122e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.989e-09 3.611e-09
25- 50 1.996e-08 1.150e-08
50-150 1.972e-08 1.248e-08
15-150 4.567e-08 2.526e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 145.906 (-87.9619 -142.116)
Norm : 3.41169 (-0.992918 1.52504)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.72 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.112394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.782e-09 5.180e-09
25- 50 1.621e-08 9.345e-09
50-150 3.163e-08 2.018e-08
15-150 5.663e-08 3.322e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.03184 (-8.16358 6.94636)
R1^2/D10^2 : 0.604433 (-0.594608 -0.594608)
kT2 [keV] : 23.2413 (-23.9132 -23.9132)
R2^2/D10^2 : 1.16343E-02 (-0.0104699 0.304201)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.20 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Null hypothesis probability = 2.931581e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.205e-09 5.160e-09
25- 50 1.865e-08 1.111e-08
50-150 2.825e-08 1.642e-08
15-150 5.511e-08 2.941e-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: 2.23137 ( -0.364514 0.416454 )
Norm@50keV : 3.59724E-03 ( -0.00103818 0.00100439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.42 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 57 degrees of freedom
# Null hypothesis probability = 1.841192e-01
Photon flux (15-150 keV) in 3.832 sec: 0.605531 ( -0.119341 0.119341 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30206e-07 ( -3.10873e-08 3.26e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51356 ( -3.52692 0.573629 )
Epeak [keV] : 24.7289 ( )
Norm@50keV : 1.02110E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 56 degrees of freedom
# Null hypothesis probability = 1.726654e-01
Photon flux (15-150 keV) in 3.832 sec: 0.594482 ( -0.122134 0.121853 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20024e-07 ( -3.60396e-08 3.91481e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.54426 ( -1.82824 1.81364 )
beta : -2.82501 ( 9.3715 19.3715 )
Epeak [keV] : 26.4208 ( -11.373 34.5605 )
Norm@50keV : 9.15386 ( -9.12542 252.153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.10 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.876040e-01
Photon flux (15-150 keV) in 3.832 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19403e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 4.15e-08
S(50-100 keV) = 3.54e-08
T90 vs. Hardness ratio plot
T90 = 3.42399999499321 sec.
Hardness ratio (energy fluence ratio) = 0.853012
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.10051
Count Ratio (50-100 keV) / (15-25 keV) = 0.418926
Mask shadow pattern
IMX = 8.089071085815778E-01, IMY = 4.437827325362833E-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:
-207.915410 -1.080000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2665 -60.7030 5.2 54.5 -153.9 1.3379 2.2 5.0 Cen X-3
186.7855 -62.8118 17.4 54.0 -143.9 -0.7134 -0.7 4.3 GX 301-2
121.6991 -46.4414 2.9 54.9 167.6 4.0356 4.0 ------ UNKNOWN
102.8268 -62.7381 2.3 35.6 171.3 1.1561 5.0 ------ UNKNOWN
349.3619 -35.8150 3.0 32.6 -5.0 0.7821 3.9 ------ UNKNOWN
150.0431 -55.0045 2.7 56.2 -168.5 2.7525 4.2 ------ UNKNOWN
329.9760 -14.7294 2.2 58.9 -15.4 5.3074 5.3 ------ UNKNOWN
309.1712 -67.7933 2.4 27.9 -87.9 1.0906 4.8 ------ UNKNOWN
314.5843 -37.8408 2.9 45.4 -45.1 1.8732 4.0 ------ UNKNOWN
273.9069 -64.5990 3.6 41.1 -98.1 2.7938 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.080000 2.752000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0522 -60.5535 19.3 54.6 -154.0 0.0422 0.6 8.8 Cen X-3
186.7452 -62.6494 8.1 54.1 -144.0 0.1435 1.4 7.7 GX 301-2
344.7737 -24.6910 2.6 44.4 -3.9 0.1389 4.4 ------ UNKNOWN
328.0799 -33.8179 1.2 42.7 -28.8 0.2869 9.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
94.084600 963.018400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
285.0459 -25.0428 8.6 38.2 -78.8 2.0096 1.3 7.4 HT1900.1-2455
13.5442 -76.4738 3.5 47.4 176.5 2.9818 3.3 ------ UNKNOWN
304.5569 11.6312 2.9 50.7 -20.7 3.7619 3.9 ------ UNKNOWN
294.6272 6.2284 4.8 51.0 -35.2 3.8606 2.4 ------ UNKNOWN
Plot creation:
Sun May 31 05:19:54 EDT 2015