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
236.4376 -0.3607 0.0219 20.8065 -50.5674 0.0474488 8.751 TRIG_00550906
Foreground time interval of the image:
0.012 0.216 (delta_t = 0.204 [sec])
Background time interval of the image:
-239.376 0.012 (delta_t = 239.388 [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 0.128000
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 0.128000
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 0.128000
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)
The mask-weighted light curves based on cleaned DPHs
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 0.012 sec. to 0.216 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50836 ( -0.338699 0.350597 )
Norm@50keV : 1.52537E-02 ( -0.0030302 0.00297764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.20 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.470537e-01
Photon flux (15-150 keV) in 0.204 sec: 1.90858 ( -0.363446 0.364374 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94798e-08 ( -6.36517e-09 6.50727e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.216 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35363 ( -1.51762 1.50512 )
Epeak [keV] : 210.124 ( -210.021 -210.021 )
Norm@50keV : 1.82648E-02 ( -0.018267 0.0832145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.16 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 56 degrees of freedom
# Null hypothesis probability = 1.277779e-01
Photon flux (15-150 keV) in 0.204 sec: 1.89505 ( -0.37941 0.37333 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9152e-08 ( -6.94661e-09 6.76505e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.216 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34086 ( -0.475301 0.803797 )
beta : -8.90684 ( 9.33545 19.2673 )
Epeak [keV] : 202.004 ( -142.94 -201.927 )
Norm@50keV : 1.82501E-02 ( -0.0062019 0.0251662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.17 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.093416e-01
Photon flux (15-150 keV) in 0.204 sec: 1.89062 ( ) 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] : 15.3639 (-3.48498 4.55008)
R^2/D10^2 : 0.197595 (-0.117158 0.284568)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.10 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 57 degrees of freedom
# Null hypothesis probability = 5.435722e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.984e-09 7.191e-10
25- 50 8.056e-09 2.647e-09
50-150 1.308e-08 5.434e-09
15-150 2.312e-08 7.926e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-108.785 -199.362)
Norm : 7.79155 (-1.46182 1.46335)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.27 using 59 PHA bins.
# Reduced chi-squared = 1.198 for 57 degrees of freedom
# Null hypothesis probability = 1.458535e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.958e-09 2.326e-09
25- 50 7.614e-09 4.401e-09
50-150 1.670e-08 9.583e-09
15-150 2.827e-08 1.647e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.02776 (-2.46327 5.34726)
R1^2/D10^2 : 6.41094 (-5.84885 154.937)
kT2 [keV] : 22.0426 (-6.69239 31.7975)
R2^2/D10^2 : 4.87038E-02 (-0.0461678 0.0777359)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.92 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 55 degrees of freedom
# Null hypothesis probability = 1.133250e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.144e-09 2.348e-09
25- 50 6.878e-09 3.721e-09
50-150 1.724e-08 1.003e-08
15-150 2.827e-08 1.515e-08
Peak spectrum fit
Power-law model
Time interval is from -0.384 sec. to 0.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28194 ( -0.516997 0.506561 )
Norm@50keV : 3.92435E-03 ( -0.00113948 0.00113917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.15 using 59 PHA bins.
# Reduced chi-squared = 0.8623 for 57 degrees of freedom
# Null hypothesis probability = 7.606453e-01
Photon flux (15-150 keV) in 1 sec: 0.466667 ( -0.139834 0.141327 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8953e-08 ( -1.21902e-08 1.24917e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.384 sec. to 0.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.209759 ( -4.38636 1.87551 )
Epeak [keV] : 81.9378 ( -30.9551 -81.6843 )
Norm@50keV : 1.84846E-02 ( -0.0188137 0.96883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.93 using 59 PHA bins.
# Reduced chi-squared = 0.8559 for 56 degrees of freedom
# Null hypothesis probability = 7.698955e-01
Photon flux (15-150 keV) in 1 sec: 0.429418 ( -0.151368 0.153074 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57965e-08 ( -1.25539e-08 1.34621e-08 ) ergs/cm2
Band function
Time interval is from -0.384 sec. to 0.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.211561 ( -1.40748 4.40653 )
beta : -10.0000 ( 10 1.77636e-14 )
Epeak [keV] : 81.6465 ( -28.4185 155.197 )
Norm@50keV : 1.86138E-02 ( -0.0185951 0.966491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.93 using 59 PHA bins.
# Reduced chi-squared = 0.8715 for 55 degrees of freedom
# Null hypothesis probability = 7.391597e-01
Photon flux (15-150 keV) in 1 sec: 0.432565 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64427e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.4460 (-5.08261 7.77521)
R^2/D10^2 : 2.82860E-02 (-0.028286 0.0559881)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8465 for 57 degrees of freedom
# Null hypothesis probability = 7.887384e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.911e-09 1.221e-09
25- 50 9.001e-09 5.310e-09
50-150 2.237e-08 1.419e-08
15-150 3.328e-08 1.947e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-112.791 -199.363)
Norm : 1.95467 (-0.571218 0.571235)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.59 using 59 PHA bins.
# Reduced chi-squared = 0.8700 for 57 degrees of freedom
# Null hypothesis probability = 7.465110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.867e-09 2.953e-09
25- 50 9.363e-09 5.740e-09
50-150 2.054e-08 1.221e-08
15-150 3.477e-08 2.112e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.71432 (-2.71165 21.8654)
R1^2/D10^2 : 17.1801 (-17.3377 2.77557e+06)
kT2 [keV] : 19.5255 (-5.68842 -19.5235)
R2^2/D10^2 : 2.27374E-02 (-0.0227464 0.04726)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.43 using 59 PHA bins.
# Reduced chi-squared = 0.8623 for 55 degrees of freedom
# Null hypothesis probability = 7.561320e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.365e-09 1.469e-09
25- 50 8.438e-09 4.990e-09
50-150 2.328e-08 1.515e-08
15-150 3.508e-08 2.093e-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: 1.50836 ( -0.338699 0.350597 )
Norm@50keV : 1.52537E-02 ( -0.0030302 0.00297764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.20 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.470537e-01
Photon flux (15-150 keV) in 0.204 sec: 1.90858 ( -0.363446 0.364374 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94798e-08 ( -6.36517e-09 6.50727e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35363 ( -1.51762 1.50512 )
Epeak [keV] : 210.124 ( -210.021 -210.021 )
Norm@50keV : 1.82648E-02 ( -0.018267 0.0832145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.16 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 56 degrees of freedom
# Null hypothesis probability = 1.277779e-01
Photon flux (15-150 keV) in 0.204 sec: 1.89505 ( -0.37941 0.37333 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9152e-08 ( -6.9464e-09 6.76525e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34086 ( -0.475301 0.803797 )
beta : -8.90684 ( 9.33545 19.2673 )
Epeak [keV] : 202.004 ( -142.94 -201.927 )
Norm@50keV : 1.82501E-02 ( -0.0062019 0.0251662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.17 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.093416e-01
Photon flux (15-150 keV) in 0.204 sec: 1.89062 ( ) 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) = 7.32e-09
S(50-100 keV) = 1.03e-08
T90 vs. Hardness ratio plot
T90 = 0.171999931335449 sec.
Hardness ratio (energy fluence ratio) = 1.4071
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.03443
Count Ratio (50-100 keV) / (15-25 keV) = 1.04429
Mask shadow pattern
IMX = 2.413613012851211E-01, IMY = 2.934972487999810E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.128000
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:
-239.376000 0.012000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9914 -15.6290 0.3 36.8 -35.4 11.0677 38.5 1.0 Sco X-1
254.4862 35.3010 2.1 41.7 -122.3 3.0056 5.6 2.9 Her X-1
256.4363 -36.4226 28.2 58.6 -24.6 -0.5161 -0.4 0.1 GX 349+2
217.9715 -12.7768 2.3 22.6 11.7 1.0604 5.1 ------ UNKNOWN
194.6483 64.3165 5.0 56.9 179.2 3.0634 2.3 ------ UNKNOWN
235.2787 -31.0277 3.1 44.0 -10.1 1.2410 3.7 ------ UNKNOWN
237.6448 20.0085 2.9 21.3 -109.6 0.8942 3.9 ------ UNKNOWN
249.2227 -23.5676 2.9 45.1 -30.7 1.4218 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.012000 0.216000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1278 -15.7412 0.0 36.9 -35.4 -0.0056 -0.7 10.5 Sco X-1
254.3811 35.3833 3.9 41.6 -122.5 -0.0420 -3.0 4.5 Her X-1
256.3819 -36.4673 4.6 58.6 -24.5 0.0865 2.5 3.7 GX 349+2
177.0559 52.3907 2.8 54.0 161.3 0.1164 4.2 ------ UNKNOWN
226.3771 -46.3851 2.3 56.7 4.4 0.1388 5.0 ------ UNKNOWN
192.8818 63.6299 2.4 56.7 177.9 0.1321 4.8 ------ UNKNOWN
225.9512 2.2044 2.3 10.8 -34.6 0.0249 5.0 ------ UNKNOWN
236.4376 -0.3607 1.3 20.8 -50.6 0.0475 8.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
62.124600 962.701900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9760 -15.6333 0.2 17.5 -31.7 45.2120 77.1 0.5 Sco X-1
254.4550 35.3534 1.6 39.5 -159.6 7.1087 7.4 0.7 Her X-1
255.8338 -37.9453 67.8 41.6 -26.3 0.1745 0.2 9.4 4U 1700-377
256.3859 -36.3945 5.4 40.5 -28.1 2.0797 2.1 2.9 GX 349+2
263.1583 -24.7722 81.9 35.6 -47.7 0.1298 0.1 8.3 GX 1+4
264.6692 -44.4777 4.4 50.7 -28.9 4.0693 2.6 3.6 4U 1735-44
268.2504 -1.4948 3.4 31.9 -90.8 3.5107 3.4 7.5 SW J1753.5-0127
270.4358 -24.9733 7.8 41.1 -53.6 2.2056 1.5 10.4 GX 5-1
270.4246 -25.5863 5.9 41.4 -52.8 3.1063 2.0 11.5 GRS 1758-258
274.0094 -13.9156 4.3 39.6 -71.4 4.7146 2.7 7.3 GX 17+2
275.8374 -30.2636 5.8 47.9 -50.7 5.8541 2.0 7.7 H1820-303
263.0014 -33.8951 2.5 41.8 -36.9 5.1748 4.7 3.7 GX 354-0
269.7316 51.1748 3.8 58.8 -159.3 14.8451 3.1 ------ UNKNOWN
272.5304 -33.9715 2.7 47.7 -44.4 8.6622 4.2 ------ UNKNOWN
275.6183 -37.8963 2.4 52.0 -42.3 15.7233 4.8 ------ UNKNOWN
Plot creation:
Sat May 30 17:15:45 EDT 2015