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
338.1424 26.6388 0.0030 35.3095 -61.9225 33.7913383 64.991 TRIG_00344582
Foreground time interval of the image:
-17.912 62.021 (delta_t = 79.933 [sec])
Background time interval of the image:
-852.379 -751.626 (delta_t = 100.753 [sec])
-239.680 -32.240 (delta_t = 207.440 [sec])
-30.680 -17.912 (delta_t = 12.768 [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 -17.912 sec. to 72.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16042 ( -0.0282893 0.0281885 )
Norm@50keV : 2.60302E-02 ( -0.000410704 0.000409392 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 28.94 using 59 PHA bins.
# Reduced chi-squared = 0.5077 for 57 degrees of freedom
# Null hypothesis probability = 9.992812e-01
Photon flux (15-150 keV) in 90.14 sec: 3.03949 ( -0.0528047 0.0530267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40794e-05 ( -3.53387e-07 3.53446e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.912 sec. to 72.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15556 ( -0.103337 0.0280231 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.61609E-02 ( -0.000387787 0.00247116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 28.96 using 59 PHA bins.
# Reduced chi-squared = 0.5171 for 56 degrees of freedom
# Null hypothesis probability = 9.989620e-01
Photon flux (15-150 keV) in 90.14 sec: 3.03860 ( -0.05361 0.05208 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40865e-05 ( -3.50374e-07 3.52898e-07 ) ergs/cm2
Band function
Time interval is from -17.912 sec. to 72.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.481819 ( 0.669924 5.63611 )
beta : -1.17295 ( -0.038244 0.0340257 )
Epeak [keV] : 70.2002 ( -70.0986 175.876 )
Norm@50keV : 7.12167E-02 ( -0.0446913 1.06514e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.34 using 59 PHA bins.
# Reduced chi-squared = 0.4971 for 55 degrees of freedom
# Null hypothesis probability = 9.993516e-01
Photon flux (15-150 keV) in 90.14 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] : 23.4493 ( )
R^2/D10^2 : 8.25163E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 885.33 using 59 PHA bins.
# Reduced chi-squared = 15.532 for 57 degrees of freedom
# Null hypothesis probability = 6.161753e-149
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.342e-07 2.416e-08
25- 50 4.026e-06 9.870e-08
50-150 1.652e-05 3.155e-07
15-150 2.128e-05 3.741e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 13.5600 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 739.57 using 59 PHA bins.
# Reduced chi-squared = 12.975 for 57 degrees of freedom
# Null hypothesis probability = 1.983183e-119
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.044e-06 5.363e-08
25- 50 5.855e-06 9.510e-08
50-150 1.284e-05 2.208e-07
15-150 2.174e-05 3.786e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.00143 (-0.55466 0.585533)
R1^2/D10^2 : 1.11209 (-0.203419 0.259861)
kT2 [keV] : 38.2458 (-2.27292 2.74802)
R2^2/D10^2 : 1.48715E-02 (-0.00289773 0.0032222)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.85 using 59 PHA bins.
# Reduced chi-squared = 0.5609 for 55 degrees of freedom
# Null hypothesis probability = 9.965299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.843e-06 1.086e-07
25- 50 5.120e-06 1.469e-07
50-150 1.716e-05 4.642e-07
15-150 2.413e-05 5.589e-07
Peak spectrum fit
Power-law model
Time interval is from 23.068 sec. to 24.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08960 ( -0.0601893 0.0599131 )
Norm@50keV : 0.160880 ( -0.00508904 0.00508092 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9325 for 57 degrees of freedom
# Null hypothesis probability = 6.200923e-01
Photon flux (15-150 keV) in 1 sec: 18.6427 ( -0.611667 0.613098 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68767e-06 ( -5.83509e-08 5.85659e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 23.068 sec. to 24.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08449 ( -0.0660865 0.0554358 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 0.161751 ( -0.0050674 0.00506023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.38 using 59 PHA bins.
# Reduced chi-squared = 0.9533 for 56 degrees of freedom
# Null hypothesis probability = 5.745257e-01
Photon flux (15-150 keV) in 1 sec: 18.6598 ( -0.6416 0.5927 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68675e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 23.068 sec. to 24.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.860934 ( 0.860934 5.85905 )
beta : -1.08961 ( -0.0641167 0.0601998 )
Epeak [keV] : 64.1665 ( -64.1665 -64.1665 )
Norm@50keV : 0.275742 ( -0.0887626 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9665 for 55 degrees of freedom
# Null hypothesis probability = 5.454385e-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] : 21.9367 ( )
R^2/D10^2 : 0.639419 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 325.91 using 59 PHA bins.
# Reduced chi-squared = 5.7178 for 57 degrees of freedom
# Null hypothesis probability = 2.407207e-39
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.702e-08 3.910e-09
25- 50 3.010e-07 1.525e-08
50-150 1.082e-06 5.600e-08
15-150 1.440e-06 5.700e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 77.4092 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 235.87 using 59 PHA bins.
# Reduced chi-squared = 4.1381 for 57 degrees of freedom
# Null hypothesis probability = 1.278901e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.928e-07 6.600e-09
25- 50 3.708e-07 1.295e-08
50-150 8.132e-07 2.755e-08
15-150 1.377e-06 4.800e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.37273 (-0.871184 0.954584)
R1^2/D10^2 : 9.23078 (-2.6891 4.07672)
kT2 [keV] : 44.1313 (-5.89157 8.84654)
R2^2/D10^2 : 6.79134E-02 (-0.0259816 0.0340524)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.24 using 59 PHA bins.
# Reduced chi-squared = 0.8225 for 55 degrees of freedom
# Null hypothesis probability = 8.232505e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.367e-07 1.420e-08
25- 50 3.398e-07 2.690e-08
50-150 1.264e-06 1.265e-07
15-150 1.740e-06 1.630e-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: 1.15688 ( -0.0279099 0.0277978 )
Norm@50keV : 2.90703E-02 ( -0.00045406 0.000452542 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 26.16 using 59 PHA bins.
# Reduced chi-squared = 0.4590 for 57 degrees of freedom
# Null hypothesis probability = 9.998500e-01
Photon flux (15-150 keV) in 79.93 sec: 3.39300 ( -0.0582802 0.0585286 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38708e-05 ( -3.46055e-07 3.46117e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15166 ( -0.028319 0.0278465 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.92157E-02 ( -0.000429249 0.00290932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 26.16 using 59 PHA bins.
# Reduced chi-squared = 0.4672 for 56 degrees of freedom
# Null hypothesis probability = 9.997748e-01
Photon flux (15-150 keV) in 79.93 sec: 3.39160 ( -0.05853 0.05745 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38788e-05 ( -3.44578e-07 3.44818e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.412580 ( 0.662283 5.63368 )
beta : -1.16912 ( -0.0377286 0.0335804 )
Epeak [keV] : 65.7793 ( -65.7021 233.661 )
Norm@50keV : 8.87027E-02 ( -0.0890474 1.42672e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.46 using 59 PHA bins.
# Reduced chi-squared = 0.4448 for 55 degrees of freedom
# Null hypothesis probability = 9.998821e-01
Photon flux (15-150 keV) in 79.93 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) = 4.94e-06
S(50-100 keV) = 8.84e-06
T90 vs. Hardness ratio plot
T90 = 41.3720000088215 sec.
Hardness ratio (energy fluence ratio) = 1.78947
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.72628
Count Ratio (50-100 keV) / (15-25 keV) = 1.7319
Mask shadow pattern
IMX = 3.333670761331051E-01, IMY = 6.249313085092625E-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:
-852.379410 -751.626300
-239.680000 -32.240000
-30.680000 -17.912000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.0974 40.9564 2.6 52.0 -27.5 2.7134 4.5 0.6 Cyg X-3
326.1696 38.3304 147.3 39.8 -37.6 -0.0270 -0.1 0.5 Cyg X-2
284.2822 74.4954 2.6 53.5 17.2 5.1513 4.4 ------ UNKNOWN
46.3315 -8.0134 3.0 54.0 -179.0 2.8132 3.9 ------ UNKNOWN
47.7178 -10.7624 2.6 57.1 -179.0 5.7548 4.5 ------ UNKNOWN
10.9445 -1.3094 2.5 40.9 -132.7 2.0616 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-17.912000 62.020620
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
308.1104 40.9523 25.2 52.0 -27.5 0.4398 0.5 0.0 Cyg X-3
326.1752 38.3281 9.3 39.8 -37.6 0.5710 1.2 0.4 Cyg X-2
55.7002 49.7321 3.3 28.6 92.4 0.9878 3.5 ------ UNKNOWN
48.3945 -8.8128 4.2 55.7 179.2 2.9351 2.7 ------ UNKNOWN
22.9349 8.8580 2.8 30.6 -153.2 1.1660 4.1 ------ UNKNOWN
19.6921 -2.1126 3.1 41.3 -146.1 1.7476 3.7 ------ UNKNOWN
338.1424 26.6388 0.2 35.3 -61.9 33.7862 65.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
151.220600 961.920600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
83.6348 22.0106 0.2 40.9 -179.4 33.9935 47.2 0.2 Crab
126.5255 59.3439 2.5 9.6 46.3 2.1301 4.6 ------ UNKNOWN
80.7427 16.2908 2.4 47.2 -178.3 4.3366 4.8 ------ UNKNOWN
301.8168 78.5655 3.2 42.0 -38.7 3.0955 3.6 ------ UNKNOWN
52.6174 19.7904 5.2 55.4 -145.2 5.9193 2.3 ------ UNKNOWN
Plot creation:
Sun May 31 04:50:28 EDT 2015