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
223.3108 -19.7241 0.0191 38.1802 -43.5380 1.1572308 10.092 TRIG_00504779
Foreground time interval of the image:
-9.000 19.100 (delta_t = 28.100 [sec])
Background time interval of the image:
-239.664 -9.000 (delta_t = 230.664 [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 8.192000
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 8.192000
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 8.192000
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 -9.000 sec. to 19.100 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22991 ( -0.280834 0.307855 )
Norm@50keV : 2.16764E-03 ( -0.000455995 0.000445367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.37 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 57 degrees of freedom
# Null hypothesis probability = 8.244209e-02
Photon flux (15-150 keV) in 28.1 sec: 0.364599 ( -0.0506845 0.0506848 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75215e-07 ( -9.961e-08 1.04133e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.000 sec. to 19.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73854 ( -1.74134 0.301183 )
Epeak [keV] : 19.6648 ( )
Norm@50keV : 4.38266E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.90 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 56 degrees of freedom
# Null hypothesis probability = 7.472815e-02
Photon flux (15-150 keV) in 28.1 sec: 0.357553 ( -0.053252 0.051893 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39593e-07 ( -1.18228e-07 1.29836e-07 ) ergs/cm2
Band function
Time interval is from -9.000 sec. to 19.100 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25108 ( 1.20066 1.20066 )
beta : -2.57964 ( 2.59021 0.589448 )
Epeak [keV] : 25.1738 ( -25.9408 9.23247 )
Norm@50keV : 9.52997E-03 ( -0.0110223 1047.37 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.45 using 59 PHA bins.
# Reduced chi-squared = 1.299 for 55 degrees of freedom
# Null hypothesis probability = 6.716452e-02
Photon flux (15-150 keV) in 28.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43075e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.95384 (-1.17696 1.4028)
R^2/D10^2 : 0.403988 (-0.194413 0.371026)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.89 using 59 PHA bins.
# Reduced chi-squared = 1.384 for 57 degrees of freedom
# Null hypothesis probability = 2.904661e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.293e-07 3.588e-08
25- 50 2.240e-07 5.145e-08
50-150 5.772e-08 2.586e-08
15-150 4.111e-07 8.444e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.1468 (-13.8664 25.2626)
Norm : 2.23604 (-0.538416 0.786131)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.10 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.577146e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.478e-07 2.943e-08
25- 50 2.007e-07 3.914e-08
50-150 1.683e-07 7.102e-08
15-150 5.168e-07 1.055e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.24948 (-3.21031 1.74461)
R1^2/D10^2 : 0.897159 (-0.532785 11.3165)
kT2 [keV] : 24.0255 (-15.4972 -24.046)
R2^2/D10^2 : 2.93886E-03 (-0.00290952 0.149079)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.80 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 55 degrees of freedom
# Null hypothesis probability = 6.367580e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.468e-07 6.833e-08
25- 50 1.976e-07 9.941e-08
50-150 2.182e-07 1.368e-07
15-150 5.627e-07 2.574e-07
Peak spectrum fit
Power-law model
Time interval is from 0.772 sec. to 1.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94431 ( -0.46406 0.534014 )
Norm@50keV : 7.73783E-03 ( -0.00250112 0.00231668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8176 for 57 degrees of freedom
# Null hypothesis probability = 8.356509e-01
Photon flux (15-150 keV) in 1 sec: 1.13194 ( -0.267954 0.268051 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11963e-08 ( -2.07663e-08 2.18811e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.772 sec. to 1.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94097 ( -1.55667 1.49411 )
Epeak [keV] : 316.591 ( )
Norm@50keV : 7.74287E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.61 using 59 PHA bins.
# Reduced chi-squared = 0.8322 for 56 degrees of freedom
# Null hypothesis probability = 8.102559e-01
Photon flux (15-150 keV) in 1 sec: 1.13195 ( -0.268822 0.26779 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.09094e-08 ( -2.13374e-08 2.1928e-08 ) ergs/cm2
Band function
Time interval is from 0.772 sec. to 1.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.89282 ( 4.89282 4.89282 )
beta : -1.94433 ( -0.534012 0.464073 )
Epeak [keV] : 56.0948 ( -56.0948 -56.0948 )
Norm@50keV : 1.05167 ( -0.339938 0.31487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8473 for 55 degrees of freedom
# Null hypothesis probability = 7.825980e-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] : 11.1428 (-4.14638 5.59871)
R^2/D10^2 : 0.332248 (-0.250398 1.58509)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9565 for 57 degrees of freedom
# Null hypothesis probability = 5.686486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.641e-09 5.211e-09
25- 50 2.484e-08 1.246e-08
50-150 1.759e-08 1.206e-08
15-150 5.107e-08 2.787e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.3707 (-46.443 -82.3711)
Norm : 5.20189 (-1.55573 2.79398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.35 using 59 PHA bins.
# Reduced chi-squared = 0.8307 for 57 degrees of freedom
# Null hypothesis probability = 8.152362e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.352e-08 7.752e-09
25- 50 2.241e-08 1.296e-08
50-150 3.226e-08 2.611e-08
15-150 6.820e-08 4.007e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.99948 (-1.74124 2.62002)
R1^2/D10^2 : 14.9425 (-13.276 334.956)
kT2 [keV] : 19.3224 (-6.87176 16.5562)
R2^2/D10^2 : 3.73199E-02 (-0.0328846 0.0645795)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.32 using 59 PHA bins.
# Reduced chi-squared = 0.8240 for 55 degrees of freedom
# Null hypothesis probability = 8.209594e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.630e-08 9.285e-09
25- 50 1.815e-08 9.675e-09
50-150 3.652e-08 2.355e-08
15-150 7.097e-08 3.667e-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: 2.22991 ( -0.280834 0.307855 )
Norm@50keV : 2.16764E-03 ( -0.000455995 0.000445367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.37 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 57 degrees of freedom
# Null hypothesis probability = 8.244209e-02
Photon flux (15-150 keV) in 28.1 sec: 0.364599 ( -0.0506845 0.0506848 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75215e-07 ( -9.961e-08 1.04133e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73854 ( -1.74134 0.301183 )
Epeak [keV] : 19.6648 ( )
Norm@50keV : 4.38266E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.90 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 56 degrees of freedom
# Null hypothesis probability = 7.472815e-02
Photon flux (15-150 keV) in 28.1 sec: 0.357553 ( -0.053252 0.051893 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39593e-07 ( -1.18228e-07 1.29836e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25108 ( 1.20066 1.20066 )
beta : -2.57964 ( 2.59021 0.589448 )
Epeak [keV] : 25.1738 ( -25.9408 9.23247 )
Norm@50keV : 9.52997E-03 ( -0.0110223 1157.45 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.45 using 59 PHA bins.
# Reduced chi-squared = 1.299 for 55 degrees of freedom
# Null hypothesis probability = 6.716452e-02
Photon flux (15-150 keV) in 28.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43075e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.83e-07
S(50-100 keV) = 1.56e-07
T90 vs. Hardness ratio plot
T90 = 23.2119999527931 sec.
Hardness ratio (energy fluence ratio) = 0.852459
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.00299
Count Ratio (50-100 keV) / (15-25 keV) = 0.358958
Mask shadow pattern
IMX = 5.700477327966055E-01, IMY = 5.416741843497430E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-239.664000 -9.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5846 -60.6217 4.6 29.8 -154.1 0.6390 2.5 7.9 Cen X-3
186.5075 -62.8260 2.1 22.0 -154.9 1.4389 5.6 5.3 GX 301-2
244.9895 -15.6370 0.4 43.3 -12.0 9.8029 26.5 0.6 Sco X-1
255.9867 -37.8443 2387.6 25.8 18.7 0.0010 0.0 0.0 4U 1700-377
256.4363 -36.4195 75.4 27.2 17.8 0.0388 0.2 0.2 GX 349+2
262.8972 -24.5687 0.0 40.3 16.3 0.4607 1.2 12.2 GX 1+4
264.6259 -44.5837 86.0 24.7 40.6 0.0373 0.1 9.5 4U 1735-44
270.4108 -25.0113 7.9 43.2 25.7 0.7541 1.5 8.0 GX 5-1
270.4371 -25.7776 3.6 42.5 26.3 1.6191 3.2 7.6 GRS 1758-258
275.9282 -30.2282 4.6 41.4 36.0 1.3329 2.5 8.3 H1820-303
263.1303 -34.0089 0.0 32.2 24.6 0.7777 2.5 12.6 GX 354-0
111.0452 -53.8029 3.0 58.3 -175.5 5.9858 3.8 ------ UNKNOWN
120.8609 -48.6194 2.9 59.0 -166.1 6.9386 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-9.000000 19.100000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.6217 -60.7374 0.0 29.8 -154.4 -0.0108 -0.1 11.3 Cen X-3
186.7446 -62.7017 6.5 21.9 -154.6 0.1249 1.8 4.8 GX 301-2
244.9402 -15.4732 4.4 43.5 -12.1 -0.2987 -2.7 10.3 Sco X-1
255.8958 -37.8512 7.6 25.8 18.6 -0.1170 -1.5 4.3 4U 1700-377
256.2369 -36.5338 0.0 27.1 17.6 -0.0942 -1.2 11.7 GX 349+2
263.0106 -24.7384 177.6 40.2 16.6 -0.0073 -0.1 0.4 GX 1+4
264.8656 -44.3726 4.3 25.0 40.5 0.2146 2.7 7.0 4U 1735-44
270.1459 -24.9383 3.9 43.1 25.3 0.4206 2.9 11.3 GX 5-1
270.2612 -25.6089 7.1 42.6 26.0 0.2388 1.6 8.4 GRS 1758-258
275.7489 -30.2096 0.0 41.4 35.8 0.2702 1.8 13.1 H1820-303
262.9029 -33.9481 7.4 32.1 24.2 -0.1483 -1.6 8.0 GX 354-0
223.3108 -19.7241 1.1 38.2 -43.5 1.1572 10.1 ------ UNKNOWN
176.5594 -33.4647 2.7 43.2 -112.6 1.1997 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
-239.664000 962.409800
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3990 -60.6859 3.6 29.9 -154.3 2.7954 3.2 4.5 Cen X-3
186.5820 -62.8087 1.6 22.0 -154.9 6.4255 7.1 3.1 GX 301-2
244.9881 -15.6383 0.3 43.3 -12.0 48.1737 37.8 0.5 Sco X-1
256.1170 -38.0256 0.0 25.7 19.2 1.8952 2.2 12.5 4U 1700-377
256.4360 -36.4192 11.3 27.2 17.8 0.9148 1.0 0.2 GX 349+2
263.1291 -24.7699 16.9 40.2 16.8 -0.8545 -0.7 6.7 GX 1+4
264.7228 -44.5268 7.3 24.8 40.6 1.6172 1.6 4.7 4U 1735-44
270.3846 -25.0465 9.4 43.1 25.7 2.0539 1.2 5.8 GX 5-1
270.4353 -25.7674 2.3 42.5 26.3 7.9435 4.9 7.3 GRS 1758-258
275.8712 -30.2223 5.2 41.4 35.9 3.9928 2.2 9.1 H1820-303
262.9872 -33.8587 17.7 32.3 24.2 0.6738 0.7 1.4 GX 354-0
259.0499 -36.8240 2.5 28.0 22.1 4.0354 4.6 ------ UNKNOWN
260.9477 -7.6031 2.4 55.3 5.1 18.7592 4.7 ------ UNKNOWN
110.9747 -53.8403 4.6 58.3 -175.5 15.6440 2.5 ------ UNKNOWN
120.7813 -48.6394 3.2 59.1 -166.2 26.4519 3.6 ------ UNKNOWN
230.1477 -3.0230 2.9 54.5 -33.0 19.0423 4.0 ------ UNKNOWN
221.0080 -7.4099 3.3 50.7 -44.8 14.7335 3.5 ------ UNKNOWN
Plot creation:
Sat May 30 21:30:32 EDT 2015