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
299.3068 -53.1500 0.0080 48.7835 -134.6594 19.4482090 24.159 TRIG_00383063
Foreground time interval of the image:
-15.760 15.452 (delta_t = 31.212 [sec])
Background time interval of the image:
-179.200 -15.760 (delta_t = 163.440 [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 2.048000
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 2.048000
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 2.048000
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 -15.760 sec. to 15.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01102 ( -0.0629294 0.0622624 )
Norm@50keV : 4.11139E-02 ( -0.00148044 0.00147483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.54 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.600924e-01
Photon flux (15-150 keV) in 31.21 sec: 4.73715 ( -0.177061 0.17577 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38227e-05 ( -4.90056e-07 4.89941e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.760 sec. to 15.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.935530 ( -0.249411 0.100726 )
Epeak [keV] : 877.049 ( -877.05 -877.05 )
Norm@50keV : 4.41586E-02 ( -0.0016783 0.011376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.26 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 56 degrees of freedom
# Null hypothesis probability = 1.441371e-01
Photon flux (15-150 keV) in 31.21 sec: 4.71866 ( -0.18397 0.18452 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38035e-05 ( -4.9936e-07 4.93898e-07 ) ergs/cm2
Band function
Time interval is from -15.760 sec. to 15.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.476153 ( 0.7966 0.7966 )
beta : -1.05659 ( -0.0622535 0.0629395 )
Epeak [keV] : 113.399 ( -112.768 240.154 )
Norm@50keV : 8.18665E-02 ( -0.0414355 907555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.39 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.397977e-01
Photon flux (15-150 keV) in 31.21 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] : 24.0982 ( )
R^2/D10^2 : 0.126385 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 214.87 using 59 PHA bins.
# Reduced chi-squared = 3.7697 for 57 degrees of freedom
# Null hypothesis probability = 3.679505e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.056e-07 2.934e-08
25- 50 2.257e-06 1.308e-07
50-150 9.763e-06 4.775e-07
15-150 1.243e-05 4.682e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 20.2819 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 293.88 using 59 PHA bins.
# Reduced chi-squared = 5.1558 for 57 degrees of freedom
# Null hypothesis probability = 1.294070e-33
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.576e-06 6.336e-08
25- 50 3.032e-06 1.195e-07
50-150 6.650e-06 2.434e-07
15-150 1.126e-05 4.120e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.56232 (-1.29054 1.46169)
R1^2/D10^2 : 1.31583 (-0.441491 0.729668)
kT2 [keV] : 41.1758 (-5.58208 9.05519)
R2^2/D10^2 : 2.09037E-02 (-0.00912081 0.0118808)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 55 degrees of freedom
# Null hypothesis probability = 1.423945e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.917e-07 1.328e-07
25- 50 2.714e-06 2.854e-07
50-150 1.032e-05 1.451e-06
15-150 1.393e-05 1.688e-06
Peak spectrum fit
Power-law model
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.652143 ( -0.246187 0.229083 )
Norm@50keV : 6.50581E-02 ( -0.00949041 0.00914798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.12 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.707830e-01
Photon flux (15-150 keV) in 1 sec: 7.55227 ( -0.992308 0.997326 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1172e-07 ( -1.01312e-07 1.01414e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.643273 ( -0.601754 0.320302 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 6.55738E-02 ( -0.00877185 0.0445064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.14 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.323939e-01
Photon flux (15-150 keV) in 1 sec: 7.57268 ( -1.01543 0.97601 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.09901e-07 ( -9.9522e-08 1.04044e-07 ) ergs/cm2
Band function
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01458 ( 1.01458 1.01458 )
beta : -0.652144 ( -0.229082 0.246151 )
Epeak [keV] : 16.6500 ( -16.65 -16.65 )
Norm@50keV : 8.70077E-02 ( -0.0300766 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.12 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.964275e-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] : 31.7228 (-5.6879 8.37506)
R^2/D10^2 : 0.100015 (-0.0473504 0.0767582)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.03 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.318401e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.520e-08 4.546e-09
25- 50 9.590e-08 2.327e-08
50-150 6.656e-07 1.421e-07
15-150 7.767e-07 1.789e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 30.2950 (-4.16046 4.16018)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.79 using 59 PHA bins.
# Reduced chi-squared = 1.751 for 57 degrees of freedom
# Null hypothesis probability = 3.955075e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.546e-08 4.199e-08
25- 50 1.451e-07 8.240e-08
50-150 3.183e-07 1.788e-07
15-150 5.390e-07 2.964e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.3004 (-6.87965 8.96744)
R1^2/D10^2 : 0.661922 (-0.543818 2.98644)
kT2 [keV] : 197.917 ( )
R2^2/D10^2 : 1.84029E-03 (-0.000593401 0.0032285)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.08 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Reduced chi-squared = 1.020 for 55 degrees of freedom
# Null hypothesis probability = 3.693032e-01
# Null hypothesis probability = 4.340995e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.484e-08 2.241e-08
25- 50 1.197e-07 6.660e-08
50-150 6.254e-07 3.546e-07
15-150 7.800e-07 4.243e-07
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: 1.01102 ( -0.0629294 0.0622624 )
Norm@50keV : 4.11139E-02 ( -0.00148044 0.00147483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.54 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.600924e-01
Photon flux (15-150 keV) in 31.21 sec: 4.73715 ( -0.177061 0.17577 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38227e-05 ( -4.90056e-07 4.89941e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.935530 ( -0.249411 0.100726 )
Epeak [keV] : 877.049 ( -877.05 -877.05 )
Norm@50keV : 4.41586E-02 ( -0.0016783 0.011376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.26 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 56 degrees of freedom
# Null hypothesis probability = 1.441371e-01
Photon flux (15-150 keV) in 31.21 sec: 4.71866 ( -0.18397 0.18452 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38035e-05 ( -4.9936e-07 4.93898e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.476153 ( 0.7966 0.7966 )
beta : -1.05659 ( -0.0622535 0.0629395 )
Epeak [keV] : 113.399 ( -112.768 244.17 )
Norm@50keV : 8.18665E-02 ( -0.0418463 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.39 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.397977e-01
Photon flux (15-150 keV) in 31.21 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) = 2.58e-06
S(50-100 keV) = 5.12e-06
T90 vs. Hardness ratio plot
T90 = 23.0679998993874 sec.
Hardness ratio (energy fluence ratio) = 1.9845
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.10409
Count Ratio (50-100 keV) / (15-25 keV) = 2.4101
Mask shadow pattern
IMX = -8.024386640723181E-01, IMY = 8.120364178031654E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-179.200000 -15.760000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
10.5218 -5.0012 2.4 26.0 48.1 2.6267 4.9 ------ UNKNOWN
346.9851 9.3895 2.5 34.9 -5.3 2.3590 4.5 ------ UNKNOWN
338.6932 30.7232 3.2 57.4 -9.4 8.2809 3.7 ------ UNKNOWN
326.8030 -81.4081 3.1 57.4 -170.2 8.3334 3.7 ------ UNKNOWN
322.0800 -76.6061 2.2 53.8 -166.2 7.1839 5.2 ------ UNKNOWN
314.7630 5.5362 2.4 48.2 -50.7 10.2779 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-15.760000 15.452000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
347.9754 12.4502 2.9 37.8 -2.9 0.5041 3.9 ------ UNKNOWN
330.7157 -5.7354 2.8 28.8 -46.5 0.5983 4.2 ------ UNKNOWN
318.3168 -44.9780 3.2 34.4 -129.1 0.6477 3.6 ------ UNKNOWN
316.0584 0.3517 3.1 43.9 -55.1 2.1904 3.8 ------ UNKNOWN
299.3068 -53.1499 0.5 48.8 -134.7 19.4487 22.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
528.100630 962.893400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4534 -40.7431 15.9 14.7 103.6 -0.2154 -0.7 11.8 Vela X-1
170.3208 -60.5973 0.9 16.8 -121.3 4.0744 13.2 1.5 Cen X-3
186.6731 -62.7812 2.3 24.6 -115.5 2.1395 5.0 0.8 GX 301-2
159.2259 -14.9716 3.5 42.8 145.3 2.7014 3.3 ------ UNKNOWN
113.1221 -35.3810 2.7 27.1 63.2 1.8559 4.2 ------ UNKNOWN
160.3388 -21.9199 3.0 36.5 150.2 2.1243 3.8 ------ UNKNOWN
201.1806 -17.8182 3.5 59.1 -166.2 6.6626 3.3 ------ UNKNOWN
29.8424 -52.0440 3.0 58.3 -19.7 6.8161 3.9 ------ UNKNOWN
235.2930 -70.2081 2.8 41.0 -93.4 7.0642 4.1 ------ UNKNOWN
Plot creation:
Sun May 31 02:20:12 EDT 2015