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
17.8853 -76.0444 0.0224 27.3669 -170.2244 0.4767006 8.548 TRIG_00324744
Foreground time interval of the image:
-2.672 26.720 (delta_t = 29.392 [sec])
Background time interval of the image:
-239.056 -2.672 (delta_t = 236.384 [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 -2.672 sec. to 26.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58218 ( -0.306052 0.311857 )
Norm@50keV : 1.05660E-03 ( -0.000202089 0.000198044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.62 using 59 PHA bins.
# Reduced chi-squared = 0.9231 for 57 degrees of freedom
# Null hypothesis probability = 6.400448e-01
Photon flux (15-150 keV) in 29.39 sec: 0.135039 ( -0.0236994 0.0237145 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91072e-07 ( -5.93446e-08 6.10768e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.672 sec. to 26.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26818 ( -2.40219 0.602578 )
Epeak [keV] : 98.5862 ( -103.225 -103.225 )
Norm@50keV : 1.60551E-03 ( -0.00155061 0.0436275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.50 using 59 PHA bins.
# Reduced chi-squared = 0.9376 for 56 degrees of freedom
# Null hypothesis probability = 6.079573e-01
Photon flux (15-150 keV) in 29.39 sec: 0.133512 ( -0.013055 0.024684 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79915e-07 ( -8.72263e-08 7.04755e-08 ) ergs/cm2
Band function
Time interval is from -2.672 sec. to 26.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64979 ( -5.96529 -4.64979 )
beta : -1.92558 ( -0.561322 0.43677 )
Epeak [keV] : 29.1711 ( -7.38847 7.3 )
Norm@50keV : 29.3473 ( -5.03959 1219.43 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.74 using 59 PHA bins.
# Reduced chi-squared = 0.9044 for 55 degrees of freedom
# Null hypothesis probability = 6.751827e-01
Photon flux (15-150 keV) in 29.39 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] : 10.9709 (-1.92473 2.58567)
R^2/D10^2 : 4.65623E-02 (-0.0253977 0.0487601)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.01 using 59 PHA bins.
# Reduced chi-squared = 0.9827 for 57 degrees of freedom
# Null hypothesis probability = 5.121887e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.440e-08 1.340e-08
25- 50 9.693e-08 2.685e-08
50-150 6.577e-08 2.893e-08
15-150 1.971e-07 5.940e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 159.740 (-89.1221 -161.198)
Norm : 0.556295 (-0.102427 0.138996)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9199 for 57 degrees of freedom
# Null hypothesis probability = 6.467737e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.175e-08 2.347e-08
25- 50 7.809e-08 4.295e-08
50-150 1.581e-07 9.449e-08
15-150 2.779e-07 1.546e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.11759 (-1.58656 1.85589)
R1^2/D10^2 : 8.22439E-02 (-0.0426355 0.0882885)
kT2 [keV] : 198.619 (-130.776 -198.744)
R2^2/D10^2 : 1.73220E-05 (-8.53431e-06 0.000628721)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.34 using 59 PHA bins.
# Reduced chi-squared = 0.8426 for 55 degrees of freedom
# Null hypothesis probability = 7.907076e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.003e-08 1.881e-08
25- 50 9.092e-08 4.636e-08
50-150 1.680e-07 3.743e-08
15-150 2.990e-07 1.061e-07
Peak spectrum fit
Power-law model
Time interval is from 3.044 sec. to 4.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48762 ( -0.539899 0.566544 )
Norm@50keV : 3.71588E-03 ( -0.00112055 0.00106972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 0.9766 for 57 degrees of freedom
# Null hypothesis probability = 5.252393e-01
Photon flux (15-150 keV) in 1 sec: 0.462360 ( -0.128798 0.129268 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53232e-08 ( -1.14538e-08 1.18476e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.044 sec. to 4.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05480 ( )
Epeak [keV] : 21.2741 ( )
Norm@50keV : 1.72992E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.10 using 59 PHA bins.
# Reduced chi-squared = 0.9839 for 56 degrees of freedom
# Null hypothesis probability = 5.089090e-01
Photon flux (15-150 keV) in 1 sec: 0.463271 ( -0.130233 0.128239 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5411e-08 ( -1.1642e-08 1.15994e-08 ) ergs/cm2
Band function
Time interval is from 3.044 sec. to 4.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21214 ( 1.21214 1.21214 )
beta : -1.48755 ( 1.48758 0.540262 )
Epeak [keV] : 32.0157 ( -31.9954 -31.9954 )
Norm@50keV : 7.39119E-03 ( -0.00469876 0.188157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.495458e-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] : 16.0294 (-5.53182 9.51608)
R^2/D10^2 : 4.03843E-02 (-0.0401286 0.133891)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.44 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.525448e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.145e-09 1.355e-09
25- 50 9.039e-09 5.440e-09
50-150 1.624e-08 1.075e-08
15-150 2.743e-08 1.753e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-199.363 -199.363)
Norm : 1.88028 (-0.520884 0.521399)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.05 using 59 PHA bins.
# Reduced chi-squared = 0.9833 for 57 degrees of freedom
# Null hypothesis probability = 5.108815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.682e-09 2.879e-09
25- 50 9.007e-09 5.525e-09
50-150 1.975e-08 1.201e-08
15-150 3.344e-08 2.030e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.77950 (-1.59156 4.92705)
R1^2/D10^2 : 33.5684 (-33.4239 36003.1)
kT2 [keV] : 21.0712 (-7.69956 54.1119)
R2^2/D10^2 : 1.48760E-02 (-0.0125664 0.0547703)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9965 for 55 degrees of freedom
# Null hypothesis probability = 4.820331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.090e-09 2.843e-09
25- 50 6.844e-09 4.059e-09
50-150 2.125e-08 1.292e-08
15-150 3.318e-08 1.907e-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: 1.58218 ( -0.306052 0.311857 )
Norm@50keV : 1.05660E-03 ( -0.000202089 0.000198044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.62 using 59 PHA bins.
# Reduced chi-squared = 0.9231 for 57 degrees of freedom
# Null hypothesis probability = 6.400448e-01
Photon flux (15-150 keV) in 29.39 sec: 0.135039 ( -0.0236994 0.0237145 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91072e-07 ( -5.93446e-08 6.10768e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26818 ( -2.40219 0.602578 )
Epeak [keV] : 98.5862 ( -103.225 -103.225 )
Norm@50keV : 1.60551E-03 ( -0.00155061 0.0436275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.50 using 59 PHA bins.
# Reduced chi-squared = 0.9376 for 56 degrees of freedom
# Null hypothesis probability = 6.079573e-01
Photon flux (15-150 keV) in 29.39 sec: 0.133512 ( -0.013055 0.024684 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79915e-07 ( -8.72263e-08 7.04755e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64979 ( -13.2207 -4.64979 )
beta : -1.92558 ( -0.561322 0.43677 )
Epeak [keV] : 29.1711 ( -7.38847 7.3 )
Norm@50keV : 29.3473 ( -5.03959 1219.43 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.74 using 59 PHA bins.
# Reduced chi-squared = 0.9044 for 55 degrees of freedom
# Null hypothesis probability = 6.751827e-01
Photon flux (15-150 keV) in 29.39 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) = 7.48e-08
S(50-100 keV) = 1.00e-07
T90 vs. Hardness ratio plot
T90 = 26.2879999577999 sec.
Hardness ratio (energy fluence ratio) = 1.3369
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.36843
Count Ratio (50-100 keV) / (15-25 keV) = 0.663231
Mask shadow pattern
IMX = -5.101016289983309E-01, IMY = 8.788627582560590E-02
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:
-239.056000 -2.672000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0552 -37.8700 5.8 37.0 -29.5 0.5644 2.0 3.6 4U 1700-377
256.4260 -36.4160 26.7 38.0 -27.8 0.1273 0.4 0.6 GX 349+2
263.1257 -24.7301 4.3 45.7 -11.9 0.9522 2.7 6.4 GX 1+4
264.6800 -44.3862 6.0 27.9 -26.4 0.3978 1.9 4.7 4U 1735-44
270.3978 -25.0392 5.2 42.9 -3.3 0.7618 2.2 6.6 GX 5-1
270.2549 -25.6356 3.9 42.4 -3.8 0.9489 2.9 6.9 GRS 1758-258
273.9867 -14.0274 12.5 52.4 5.6 0.5683 0.9 1.2 GX 17+2
275.9099 -30.3855 4.3 36.2 1.0 0.7152 2.7 1.4 H1820-303
284.9284 -24.8028 9.1 39.4 16.0 -0.4066 -1.3 9.2 HT1900.1-2455
262.9855 -33.8376 2.2 37.6 -18.1 1.3515 5.3 0.3 GX 354-0
292.1667 -18.6176 2.7 44.5 27.4 2.0414 4.2 ------ UNKNOWN
281.0967 -12.1761 2.0 52.5 14.7 4.6759 5.9 ------ UNKNOWN
273.2337 -10.0276 2.5 56.4 6.1 5.4369 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.672000 26.720000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.0197 -37.7130 4.7 37.1 -29.3 0.1892 2.5 8.0 4U 1700-377
256.4524 -36.4558 15.0 38.0 -27.8 0.0628 0.8 2.1 GX 349+2
262.9011 -24.8311 7.6 45.7 -12.2 -0.1439 -1.5 7.8 GX 1+4
264.8858 -44.2766 4.1 27.9 -26.0 -0.1717 -2.8 12.1 4U 1735-44
270.1353 -24.9905 6.6 43.1 -3.6 -0.1564 -1.7 9.7 GX 5-1
270.3931 -25.6236 13.2 42.4 -3.6 -0.0755 -0.9 8.7 GRS 1758-258
273.8806 -13.9932 7.7 52.4 5.5 0.2810 1.5 7.7 GX 17+2
276.0659 -30.3460 7.8 36.2 1.2 -0.1066 -1.5 7.4 H1820-303
285.0963 -24.7853 18.3 39.4 16.3 0.0556 0.6 8.8 HT1900.1-2455
262.9986 -33.6872 4.1 37.7 -17.9 -0.2082 -2.8 8.9 GX 354-0
341.0981 -31.8111 2.4 39.6 98.1 1.0078 4.9 ------ UNKNOWN
17.8850 -76.0444 1.3 27.4 -170.2 0.4774 8.6 ------ UNKNOWN
215.8261 -55.8768 1.9 41.1 -81.3 1.2473 6.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Sun May 31 06:26:32 EDT 2015