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
198.4005 8.0868 0.0189 36.0053 97.4801 2.5604129 10.214 TRIG_00346386
Foreground time interval of the image:
-9.699 74.808 (delta_t = 84.507 [sec])
Background time interval of the image:
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 64.000000
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 64.000000
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 64.000000
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 -21.256 sec. to 74.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89870 ( -0.268844 0.288473 )
Norm@50keV : 1.70815E-03 ( -0.000300979 0.000289378 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.09 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.717076e-01
Photon flux (15-150 keV) in 96.06 sec: 0.245002 ( -0.0349457 0.034975 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5085e-06 ( -2.54835e-07 2.60731e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.256 sec. to 74.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89239 ( -0.917036 1.29712 )
Epeak [keV] : 491.269 ( -9999.29 -9999.3 )
Norm@50keV : 1.71998E-03 ( -0.00170856 0.00361152 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.338923e-01
Photon flux (15-150 keV) in 96.06 sec: 0.244991 ( -0.017767 0.034902 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50593e-06 ( -2.65692e-07 2.60025e-07 ) ergs/cm2
Band function
Time interval is from -21.256 sec. to 74.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97993 ( -4.97993 -4.97993 )
beta : -1.91713 ( -0.316136 0.277698 )
Epeak [keV] : 17.8442 ( -17.8442 6.35827 )
Norm@50keV : 2237.22 ( -316.484 2.27473e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.04 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.990936e-01
Photon flux (15-150 keV) in 96.06 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] : 10.9583 (-2.06244 2.60768)
R^2/D10^2 : 7.83577E-02 (-0.0423162 0.0928816)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.62 using 59 PHA bins.
# Reduced chi-squared = 1.309 for 57 degrees of freedom
# Null hypothesis probability = 5.862210e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.887e-07 5.379e-08
25- 50 5.310e-07 1.308e-07
50-150 3.591e-07 1.232e-07
15-150 1.079e-06 2.234e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 88.2003 (-35.3915 87.8848)
Norm : 1.10564 (-0.217156 0.299108)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.51 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.197034e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.769e-07 6.018e-08
25- 50 4.663e-07 8.986e-08
50-150 7.012e-07 3.968e-07
15-150 1.444e-06 4.381e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.48947 (-1.6319 2.69149)
R1^2/D10^2 : 1.80059 (-1.48291 14.3401)
kT2 [keV] : 19.4197 (-5.54834 14.6352)
R2^2/D10^2 : 7.65698E-03 (-0.00662118 0.0212208)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.70 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 55 degrees of freedom
# Null hypothesis probability = 3.755702e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.220e-07 1.807e-07
25- 50 3.969e-07 1.743e-07
50-150 7.381e-07 4.442e-07
15-150 1.457e-06 7.621e-07
Peak spectrum fit
Power-law model
Time interval is from 4.860 sec. to 5.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45560 ( -1.05044 0.944236 )
Norm@50keV : 6.05799E-03 ( -0.00261396 0.00250643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.11 using 59 PHA bins.
# Reduced chi-squared = 0.9318 for 57 degrees of freedom
# Null hypothesis probability = 6.217629e-01
Photon flux (15-150 keV) in 1 sec: 0.747482 ( -0.747482 0.337508 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.79217e-08 ( -2.60459e-08 2.62397e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.860 sec. to 5.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46152 ( -2.23871 -2.46279 )
Epeak [keV] : 157.020 ( )
Norm@50keV : 1.84890E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.16 using 59 PHA bins.
# Reduced chi-squared = 0.9314 for 56 degrees of freedom
# Null hypothesis probability = 6.210559e-01
Photon flux (15-150 keV) in 1 sec: 0.760847 ( -0.760847 0.326283 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72092e-08 ( -2.53333e-08 2.02976e-08 ) ergs/cm2
Band function
Time interval is from 4.860 sec. to 5.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17177 ( 1.17209 1.17209 )
beta : -1.45335 ( 1.4543 1.04986 )
Epeak [keV] : 31.8148 ( -31.863 -31.863 )
Norm@50keV : 1.23559E-02 ( -0.0123612 7004.57 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.11 using 59 PHA bins.
# Reduced chi-squared = 0.9656 for 55 degrees of freedom
# Null hypothesis probability = 5.471678e-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] : 25.1699 (-25.4812 -25.4812)
R^2/D10^2 : 1.35123E-02 (-0.0126987 1.75247)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.715194e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.482e-09 1.059e-09
25- 50 8.435e-09 5.575e-09
50-150 3.959e-08 2.787e-08
15-150 4.950e-08 3.296e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 3.05945 (-1.28602 1.86348)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.65 using 59 PHA bins.
# Reduced chi-squared = 0.9412 for 57 degrees of freedom
# Null hypothesis probability = 6.015266e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.618e-09 5.175e-09
25- 50 1.465e-08 9.370e-09
50-150 3.214e-08 2.206e-08
15-150 5.441e-08 3.364e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.33524 (-5.12803 4.18785)
R1^2/D10^2 : 1.49401 (-1.16369 153.781)
kT2 [keV] : 61.6483 (-82.5212 -84.5585)
R2^2/D10^2 : 9.92118E-04 (-0.000488989 0.0298567)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9443 for 55 degrees of freedom
# Null hypothesis probability = 5.924385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.928e-09 6.560e-09
25- 50 1.223e-08 7.660e-09
50-150 3.961e-08 2.409e-08
15-150 6.077e-08 2.932e-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: 1.89727 ( -0.296418 0.320071 )
Norm@50keV : 1.71254E-03 ( -0.000329161 0.000313886 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.29 using 59 PHA bins.
# Reduced chi-squared = 0.9701 for 57 degrees of freedom
# Null hypothesis probability = 5.393251e-01
Photon flux (15-150 keV) in 84.51 sec: 0.245483 ( -0.0377224 0.0377686 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33054e-06 ( -2.43875e-07 2.49806e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21890 ( )
Epeak [keV] : 87.5636 ( )
Norm@50keV : 1.15515E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.78 using 59 PHA bins.
# Reduced chi-squared = 0.9782 for 56 degrees of freedom
# Null hypothesis probability = 5.210599e-01
Photon flux (15-150 keV) in 84.51 sec: 0.245793 ( -0.038137 0.037487 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33275e-06 ( -2.45747e-07 2.42366e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47108 ( 1.46412 1.46412 )
beta : -1.88762 ( 1.89761 0.296374 )
Epeak [keV] : 18.3737 ( -20.1285 -20.1285 )
Norm@50keV : 4.33855E-03 ( -0.00432582 483398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.30 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 55 degrees of freedom
# Null hypothesis probability = 4.632062e-01
Photon flux (15-150 keV) in 84.51 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) = 4.40e-07
S(50-100 keV) = 4.72e-07
T90 vs. Hardness ratio plot
T90 = 83.039999961853 sec.
Hardness ratio (energy fluence ratio) = 1.07273
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.904201
Count Ratio (50-100 keV) / (15-25 keV) = 0.698758
Mask shadow pattern
IMX = -9.460073011165211E-02, IMY = -7.205011896212690E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-9.699400 74.808000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9848 -15.6623 0.5 16.1 -72.7 2.4355 25.5 1.4 Sco X-1
254.5196 35.3298 3.8 47.7 -170.8 0.5450 3.0 3.1 Her X-1
255.9784 -37.8462 1.9 38.2 -49.0 1.0140 6.1 0.4 4U 1700-377
256.3917 -36.4851 3.6 37.4 -51.0 0.4987 3.2 4.3 GX 349+2
262.8197 -24.8588 0.0 35.1 -72.5 -0.1570 -0.9 12.3 GX 1+4
264.5482 -44.4742 4.8 47.4 -48.9 0.9393 2.4 8.5 4U 1735-44
268.4271 -1.4664 4.8 37.5 -113.4 0.4974 2.4 3.6 SW J1753.5-0127
270.0996 -25.1912 0.0 41.3 -76.0 0.3636 0.9 12.1 GX 5-1
270.2513 -25.7777 10.8 41.7 -75.2 0.4343 1.1 3.5 GRS 1758-258
262.9125 -33.7351 3.1 39.7 -59.9 0.8030 3.8 7.1 GX 354-0
198.4005 8.0868 1.1 36.0 97.5 2.5608 10.2 ------ UNKNOWN
272.1389 -14.6201 2.6 40.9 -92.4 1.7715 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
819.400600 963.050000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9620 -15.6517 0.5 25.7 99.1 4.9699 23.6 1.2 Sco X-1
255.9832 -37.8865 1.8 17.2 32.4 0.8917 6.3 2.5 4U 1700-377
256.3573 -36.4621 6.2 16.0 35.6 0.2647 1.8 4.4 GX 349+2
262.9785 -24.8853 4.8 6.7 86.8 0.3318 2.4 8.5 GX 1+4
264.6621 -44.5579 11.3 19.4 3.2 0.1391 1.0 7.3 4U 1735-44
268.3531 -1.4571 2.4 24.4 166.2 0.7189 4.8 0.9 SW J1753.5-0127
270.1179 -25.0711 9.9 0.7 156.1 0.1534 1.2 9.1 GX 5-1
270.2153 -25.7215 3.5 0.1 98.9 0.4526 3.4 4.9 GRS 1758-258
273.9176 -14.0570 1.9 12.2 -172.3 0.8601 6.2 5.3 GX 17+2
275.9910 -30.3609 3.9 6.8 -55.1 0.3992 3.0 3.4 H1820-303
285.0368 -25.0246 5.7 13.3 -99.0 0.2894 2.0 6.2 HT1900.1-2455
288.8199 10.9611 1.6 40.9 -160.7 1.6478 7.1 1.6 GRS 1915+105
262.9960 -33.8360 3.7 10.3 27.3 0.4230 3.1 0.4 GX 354-0
251.1284 8.8568 2.5 39.3 140.1 1.4142 4.6 ------ UNKNOWN
255.6770 -48.7717 1.9 25.7 13.5 0.8635 5.9 ------ UNKNOWN
278.1312 29.3673 2.5 55.6 179.2 2.8180 4.6 ------ UNKNOWN
290.1810 -16.0831 3.2 20.9 -122.7 0.5387 3.7 ------ UNKNOWN
297.1774 25.4053 3.4 57.4 -160.1 2.6366 3.4 ------ UNKNOWN
313.9427 -16.5419 3.0 41.5 -103.0 2.6895 3.8 ------ UNKNOWN
Plot creation:
Sun May 31 04:40:14 EDT 2015