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
238.1879 -30.9055 0.0131 46.0736 -156.8753 0.9609352 14.606 TRIG_00230702
Foreground time interval of the image:
-0.068 9.888 (delta_t = 9.956 [sec])
Background time interval of the image:
-239.680 -0.068 (delta_t = 239.612 [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 4.096000
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 4.096000
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 4.096000
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 -0.068 sec. to 9.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.47374 ( -0.227504 0.246634 )
Norm@50keV : 4.95785E-03 ( -0.000836987 0.000822281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.185311e-01
Photon flux (15-150 keV) in 9.956 sec: 0.958497 ( -0.105095 0.105189 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90182e-07 ( -6.17177e-08 6.32222e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.068 sec. to 9.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81548 ( -1.30296 0.187877 )
Epeak [keV] : 10.4177 ( )
Norm@50keV : 1.26142E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.275778e-01
Photon flux (15-150 keV) in 9.956 sec: 0.934135 ( -0.110792 0.111025 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59642e-07 ( -6.99339e-08 7.6924e-08 ) ergs/cm2
Band function
Time interval is from -0.068 sec. to 9.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51283 ( 0.966993 0.966993 )
beta : -2.96495 ( 3.01225 0.688339 )
Epeak [keV] : 17.6929 ( -17.8169 10.2323 )
Norm@50keV : 2.01816E-02 ( -0.0110805 2096.13 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 4.000745e-01
Photon flux (15-150 keV) in 9.956 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] : 7.68353 (-0.940209 1.0557)
R^2/D10^2 : 1.18447 (-0.492865 0.873732)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.94 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 57 degrees of freedom
# Null hypothesis probability = 1.165329e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.220e-07 2.564e-08
25- 50 1.988e-07 2.977e-08
50-150 4.562e-08 1.660e-08
15-150 3.664e-07 5.506e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.0932 (-8.06118 11.5697)
Norm : 6.84259 (-1.488 2.02215)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.71 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.489819e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.472e-07 2.210e-08
25- 50 1.798e-07 2.628e-08
50-150 1.157e-07 4.202e-08
15-150 4.428e-07 6.850e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.22043 (-1.72806 2.37997)
R1^2/D10^2 : 9.79693 (-7.75699 117.506)
kT2 [keV] : 12.1014 (-3.31967 15.1449)
R2^2/D10^2 : 0.126649 (-0.122395 0.151605)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.17 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.594970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.534e-07 7.975e-08
25- 50 1.722e-07 8.866e-08
50-150 1.108e-07 6.511e-08
15-150 4.364e-07 2.248e-07
Peak spectrum fit
Power-law model
Time interval is from 4.928 sec. to 5.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43605 ( -0.401835 0.461428 )
Norm@50keV : 7.50593E-03 ( -0.00244453 0.00243357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.26 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.930457e-01
Photon flux (15-150 keV) in 1 sec: 1.41866 ( -0.317943 0.318133 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.38295e-08 ( -1.88465e-08 1.97613e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.928 sec. to 5.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.26131E-02 ( 0.0676691 2.20124 )
Epeak [keV] : 26.9055 ( )
Norm@50keV : 0.325593 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 56 degrees of freedom
# Null hypothesis probability = 4.804951e-01
Photon flux (15-150 keV) in 1 sec: 1.33149 ( -0.32466 0.33013 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85036e-08 ( -1.6625e-08 2.34362e-08 ) ergs/cm2
Band function
Time interval is from 4.928 sec. to 5.928 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.32671 ( -2.72792 -0.45476 )
beta : -3.38975 ( 9.37167 19.3671 )
Epeak [keV] : 25.6906 ( -10.2329 9.00479 )
Norm@50keV : 534.768 ( -533.853 187.906 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.54 using 59 PHA bins.
# Reduced chi-squared = 0.9734 for 55 degrees of freedom
# Null hypothesis probability = 5.306166e-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] : 7.02558 (-1.33749 1.77664)
R^2/D10^2 : 2.75622 (-1.70321 4.09279)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9798 for 57 degrees of freedom
# Null hypothesis probability = 5.183120e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.194e-08 8.523e-09
25- 50 3.026e-08 1.560e-08
50-150 5.080e-09 3.421e-09
15-150 5.727e-08 2.525e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.5541 (-12.3819 24.4791)
Norm : 10.8733 (-4.00758 6.82044)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.67 using 59 PHA bins.
# Reduced chi-squared = 0.9941 for 57 degrees of freedom
# Null hypothesis probability = 4.875459e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.302e-08 7.570e-09
25- 50 2.748e-08 1.052e-08
50-150 1.671e-08 1.131e-08
15-150 6.720e-08 2.222e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.15516 (-6.15543 2.05674)
R1^2/D10^2 : 4.20048 (-4.1859 -4.1859)
kT2 [keV] : 18.8917 (-18.8297 -18.8297)
R2^2/D10^2 : 1.54973E-02 (-0.0165185 5.13852)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.42 using 59 PHA bins.
# Reduced chi-squared = 0.9895 for 55 degrees of freedom
# Null hypothesis probability = 4.966444e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.300e-08 1.406e-08
25- 50 2.831e-08 1.701e-08
50-150 1.602e-08 9.800e-09
15-150 6.733e-08 3.819e-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: 2.47374 ( -0.227504 0.246634 )
Norm@50keV : 4.95785E-03 ( -0.000836987 0.000822281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.185311e-01
Photon flux (15-150 keV) in 9.956 sec: 0.958497 ( -0.105095 0.105189 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90182e-07 ( -6.17177e-08 6.32222e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81548 ( -1.30296 0.187877 )
Epeak [keV] : 10.4177 ( )
Norm@50keV : 1.26142E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.275778e-01
Photon flux (15-150 keV) in 9.956 sec: 0.934135 ( -0.110792 0.111025 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59642e-07 ( -6.99339e-08 7.6924e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51283 ( 0.966993 0.966993 )
beta : -2.96495 ( 3.01225 0.688339 )
Epeak [keV] : 17.6929 ( -17.8169 10.2339 )
Norm@50keV : 2.01816E-02 ( -0.0110805 2096.13 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 4.000745e-01
Photon flux (15-150 keV) in 9.956 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) = 1.62e-07
S(50-100 keV) = 1.17e-07
T90 vs. Hardness ratio plot
T90 = 8.94800001382828 sec.
Hardness ratio (energy fluence ratio) = 0.722222
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.941306
Count Ratio (50-100 keV) / (15-25 keV) = 0.282691
Mask shadow pattern
IMX = -9.547791601715945E-01, IMY = 4.077347397311630E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.680000 -0.068000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9831 -15.6404 0.2 29.6 -157.5 12.5364 52.8 0.2 Sco X-1
254.4607 35.3451 1.8 23.0 3.1 1.5210 6.5 0.2 Her X-1
256.0200 -37.8621 1.9 50.3 -178.0 3.2547 6.2 1.9 4U 1700-377
256.4340 -36.4427 6.4 48.8 -178.5 0.7840 1.8 1.2 GX 349+2
263.0945 -24.7457 8.3 38.0 170.9 0.4604 1.4 4.7 GX 1+4
268.3932 -1.3044 11.0 19.3 137.5 0.2497 1.0 9.0 SW J1753.5-0127
270.2347 -24.9761 5.3 40.3 161.3 0.9306 2.2 6.7 GX 5-1
270.3100 -25.8908 6.8 41.2 161.8 0.7556 1.7 8.9 GRS 1758-258
274.0133 -14.0253 27.0 32.6 146.8 0.1486 0.4 0.8 GX 17+2
276.0567 -30.2018 24.6 47.3 158.0 0.3302 0.5 12.0 H1820-303
284.9276 -25.0439 59.5 47.7 145.2 0.1719 0.2 9.5 HT1900.1-2455
288.7050 10.9054 3.3 33.4 92.3 1.8166 3.4 6.0 GRS 1915+105
262.9665 -33.8717 3.0 46.9 173.9 1.7874 3.8 2.5 GX 354-0
231.3413 -8.1506 2.8 30.9 -127.0 1.1591 4.1 ------ UNKNOWN
208.0506 32.7121 3.2 47.1 -53.1 3.8613 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.068000 9.888000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0958 -15.6468 4.4 29.6 -157.7 -0.1014 -2.6 6.7 Sco X-1
254.2785 35.4843 6.0 23.1 2.7 0.0735 1.9 12.2 Her X-1
255.8604 -37.8064 6.5 50.2 -177.8 0.1463 1.8 6.4 4U 1700-377
256.4607 -36.4347 30.2 48.8 -178.5 0.0295 0.4 1.4 GX 349+2
262.9227 -24.6741 7.3 37.9 171.1 -0.0818 -1.6 6.4 GX 1+4
268.2215 -1.3156 0.0 19.2 137.9 -0.0460 -1.2 12.0 SW J1753.5-0127
270.2606 -25.0717 5.9 40.4 161.3 -0.1220 -2.0 1.4 GX 5-1
270.3601 -25.7063 12.4 41.0 161.6 0.0598 0.9 3.8 GRS 1758-258
274.1039 -14.0453 17.1 32.7 146.7 0.0342 0.7 5.7 GX 17+2
275.8462 -30.2350 10.4 47.3 158.2 -0.1091 -1.1 8.9 H1820-303
284.9069 -24.8840 3.7 47.5 145.1 -0.4239 -3.1 7.4 HT1900.1-2455
288.9293 11.0634 8.0 33.6 92.0 0.1178 1.5 10.5 GRS 1915+105
262.9827 -33.6846 11.0 46.7 173.9 0.0775 1.1 9.0 GX 354-0
286.9731 56.5503 2.8 50.7 25.8 0.6880 4.1 ------ UNKNOWN
239.3845 61.6710 2.2 50.5 -5.9 0.4358 5.2 ------ UNKNOWN
238.1879 -30.9055 0.8 46.1 -156.9 0.9613 14.6 ------ UNKNOWN
222.6574 49.9861 2.5 45.8 -24.9 0.3000 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
101.220590 388.920600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.2972 -60.6233 78.3 52.7 -162.9 0.1051 0.1 0.5 Cen X-3
187.0181 -62.7662 113.3 45.4 -167.6 0.0485 0.1 9.9 GX 301-2
244.9781 -15.6388 0.2 16.5 6.0 13.2803 55.9 0.1 Sco X-1
255.9948 -37.8419 0.7 16.2 102.5 4.0199 15.9 0.4 4U 1700-377
256.4786 -36.4127 3.0 16.2 97.2 0.9802 3.9 2.2 GX 349+2
263.1171 -24.7487 2.2 22.8 62.9 1.8299 5.3 5.9 GX 1+4
264.6753 -44.3124 6.4 24.7 112.6 -0.6215 -1.8 8.8 4U 1735-44
268.4950 -1.3423 0.0 41.2 32.3 0.5796 1.0 10.1 SW J1753.5-0127
270.2497 -25.1149 5.2 28.8 68.8 0.8618 2.2 2.8 GX 5-1
270.1383 -25.8432 5.1 28.5 70.2 0.9049 2.2 10.7 GRS 1758-258
273.9866 -13.8997 8.8 37.0 53.1 0.7369 1.3 8.3 GX 17+2
276.0304 -30.4718 5.6 32.4 81.5 1.1201 2.1 8.3 H1820-303
262.9567 -33.8641 1.9 21.1 87.0 1.8611 6.1 2.4 GX 354-0
156.8627 -59.1634 4.8 59.5 -161.7 6.2567 2.4 ------ UNKNOWN
195.5740 -16.9828 4.2 41.1 -98.0 5.1088 2.8 ------ UNKNOWN
183.7363 -31.8199 2.8 46.0 -123.8 6.2952 4.1 ------ UNKNOWN
218.1162 17.4035 4.7 52.0 -42.3 4.3281 2.5 ------ UNKNOWN
Plot creation:
Sun May 31 11:59:20 EDT 2015