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
211.9146 1.3321 0.0018 15.4023 -4.5242 11.1562718 105.463 TRIG_00582760
Foreground time interval of the image:
-0.148 9.189 (delta_t = 9.337 [sec])
Background time interval of the image:
-50.011 -0.148 (delta_t = 49.863 [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 0.064000
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 0.064000
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 0.064000
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 -0.148 sec. to 131.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37422 ( -0.0416163 0.0415434 )
Norm@50keV : 5.96584E-03 ( -0.000128529 0.000128483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.66 using 59 PHA bins.
# Reduced chi-squared = 0.6431 for 57 degrees of freedom
# Null hypothesis probability = 9.834503e-01
Photon flux (15-150 keV) in 131.4 sec: 0.722391 ( -0.0174096 0.0174626 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61568e-06 ( -1.71179e-07 1.71348e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 131.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22974 ( -0.170123 0.131195 )
Epeak [keV] : 304.134 ( -132.839 -304.156 )
Norm@50keV : 6.90640E-03 ( -0.000976658 0.00126157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.41 using 59 PHA bins.
# Reduced chi-squared = 0.6145 for 56 degrees of freedom
# Null hypothesis probability = 9.897802e-01
Photon flux (15-150 keV) in 131.4 sec: 0.714182 ( -0.019505 0.019592 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.54917e-06 ( -1.894e-07 1.88572e-07 ) ergs/cm2
Band function
Time interval is from -0.148 sec. to 131.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.997407 ( -0.291118 5.72476 )
beta : -1.44155 ( 1.4422 0.0822003 )
Epeak [keV] : 118.216 ( -82.6792 1333.86 )
Norm@50keV : 9.37334E-03 ( -0.0029552 0.0085772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.22 using 59 PHA bins.
# Reduced chi-squared = 0.6039 for 55 degrees of freedom
# Null hypothesis probability = 9.911963e-01
Photon flux (15-150 keV) in 131.4 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] : 18.4256 ( )
R^2/D10^2 : 4.01214E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 429.10 using 59 PHA bins.
# Reduced chi-squared = 7.5280 for 57 degrees of freedom
# Null hypothesis probability = 1.740257e-58
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.556e-07 1.597e-08
25- 50 1.673e-06 5.453e-08
50-150 4.147e-06 1.524e-07
15-150 6.176e-06 1.629e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.04009 (-0.0656122 0.065568)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.88 using 59 PHA bins.
# Reduced chi-squared = 1.8927 for 57 degrees of freedom
# Null hypothesis probability = 5.463042e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.950e-07 2.595e-08
25- 50 1.914e-06 4.993e-08
50-150 4.198e-06 1.031e-07
15-150 7.107e-06 1.748e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.33253 (-0.789972 0.841348)
R1^2/D10^2 : 0.371362 (-0.0964824 0.143455)
kT2 [keV] : 31.8642 (-2.9974 4.05568)
R2^2/D10^2 : 5.15248E-03 (-0.00171079 0.00212691)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.41 using 59 PHA bins.
# Reduced chi-squared = 0.8619 for 55 degrees of freedom
# Null hypothesis probability = 7.567705e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.340e-07 5.637e-08
25- 50 1.837e-06 8.804e-08
50-150 4.926e-06 2.891e-07
15-150 7.497e-06 3.732e-07
Peak spectrum fit
Power-law model
Time interval is from 1.968 sec. to 2.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03566 ( -0.0342582 0.034139 )
Norm@50keV : 0.257855 ( -0.00495106 0.00494506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.31 using 59 PHA bins.
# Reduced chi-squared = 0.8827 for 57 degrees of freedom
# Null hypothesis probability = 7.222342e-01
Photon flux (15-150 keV) in 1 sec: 29.7510 ( -0.592244 0.592174 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7539e-06 ( -5.44951e-08 5.45206e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.968 sec. to 2.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.792531 ( -0.142498 0.138167 )
Epeak [keV] : 303.282 ( -88.4962 297.505 )
Norm@50keV : 0.325426 ( -0.0394226 0.046131 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.13 using 59 PHA bins.
# Reduced chi-squared = 0.7344 for 56 degrees of freedom
# Null hypothesis probability = 9.317289e-01
Photon flux (15-150 keV) in 1 sec: 29.3669 ( -0.625 0.6262 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73194e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.968 sec. to 2.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99993 ( -7.29958e-07 -4.99993 )
beta : -1.06559 ( -0.0364954 0.0364277 )
Epeak [keV] : 28.2306 ( -4.01501 2.62672 )
Norm@50keV : 8592.69 ( -159.484 12720.9 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.37 using 59 PHA bins.
# Reduced chi-squared = 0.7521 for 55 degrees of freedom
# Null hypothesis probability = 9.132389e-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] : 22.9353 ( )
R^2/D10^2 : 0.925573 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 451.76 using 59 PHA bins.
# Reduced chi-squared = 7.9256 for 57 degrees of freedom
# Null hypothesis probability = 8.527830e-63
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.836e-08 3.425e-09
25- 50 4.786e-07 1.340e-08
50-150 1.881e-06 5.450e-08
15-150 2.448e-06 5.500e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 125.622 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 705.57 using 59 PHA bins.
# Reduced chi-squared = 12.378 for 57 degrees of freedom
# Null hypothesis probability = 1.319270e-112
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.128e-07 6.350e-09
25- 50 6.017e-07 1.275e-08
50-150 1.320e-06 2.850e-08
15-150 2.234e-06 4.550e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.12613 (-0.85675 0.938044)
R1^2/D10^2 : 8.91828 (-2.17486 3.0958)
kT2 [keV] : 36.3603 (-2.83359 3.76278)
R2^2/D10^2 : 0.185841 (-0.0500145 0.0564947)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.04 using 59 PHA bins.
# Reduced chi-squared = 0.7826 for 55 degrees of freedom
# Null hypothesis probability = 8.790581e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.795e-07 1.305e-08
25- 50 5.408e-07 2.220e-08
50-150 2.023e-06 9.200e-08
15-150 2.743e-06 1.065e-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: 1.33186 ( -0.0278653 0.0277956 )
Norm@50keV : 7.61529E-02 ( -0.0011705 0.0011692 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.07 using 59 PHA bins.
# Reduced chi-squared = 0.8785 for 57 degrees of freedom
# Null hypothesis probability = 7.303239e-01
Photon flux (15-150 keV) in 9.337 sec: 9.14072 ( -0.161423 0.161906 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.97333e-06 ( -1.04129e-07 1.04139e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11008 ( -0.117184 0.114404 )
Epeak [keV] : 247.605 ( -63.6741 186.813 )
Norm@50keV : 9.37817E-02 ( -0.00934594 0.0106075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.97 using 59 PHA bins.
# Reduced chi-squared = 0.6959 for 56 degrees of freedom
# Null hypothesis probability = 9.594623e-01
Photon flux (15-150 keV) in 9.337 sec: 8.97629 ( -0.17885 0.17983 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91581e-06 ( -1.09094e-07 1.08944e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.808840 ( -0.433647 2.13294 )
beta : -1.40764 ( 1.40848 0.0608549 )
Epeak [keV] : 104.809 ( -72.2867 275.324 )
Norm@50keV : 0.139597 ( -0.051084 0.375508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.68 using 59 PHA bins.
# Reduced chi-squared = 0.7033 for 55 degrees of freedom
# Null hypothesis probability = 9.533567e-01
Photon flux (15-150 keV) in 9.337 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) = 1.77e-06
S(50-100 keV) = 2.72e-06
T90 vs. Hardness ratio plot
T90 = 55.0799999237061 sec.
Hardness ratio (energy fluence ratio) = 1.53672
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.45937
Count Ratio (50-100 keV) / (15-25 keV) = 1.18417
Mask shadow pattern
IMX = 2.746303727687254E-01, IMY = 2.173074247403469E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-50.011400 -0.148000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9872 -15.5755 2.6 41.6 -67.6 1.2870 4.5 3.9 Sco X-1
254.4576 35.3437 19.0 38.5 -152.9 0.0646 0.6 0.1 Her X-1
208.0954 60.4102 2.5 45.1 148.3 0.9547 4.6 ------ UNKNOWN
224.5782 67.8308 3.0 52.3 158.2 1.5421 3.9 ------ UNKNOWN
237.0530 53.4750 2.4 40.7 172.7 0.5723 4.8 ------ UNKNOWN
256.2271 1.3584 2.9 41.0 -98.5 1.3440 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.148000 9.188600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8841 -15.5391 5.0 41.5 -67.6 0.9791 2.3 8.2 Sco X-1
254.2463 35.3167 13.5 38.3 -152.9 0.1414 0.9 10.5 Her X-1
211.9146 1.3321 0.1 15.4 -4.5 11.1564 105.5 ------ UNKNOWN
249.7351 34.9077 2.4 34.7 -154.7 0.6704 4.9 ------ UNKNOWN
265.3639 46.1887 1.9 50.1 -163.1 1.5508 6.2 ------ UNKNOWN
265.6843 28.5107 2.4 46.2 -139.8 1.2238 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
45.788590 962.828000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9648 -15.6585 0.8 36.8 -85.4 25.8801 13.6 1.4 Sco X-1
254.5369 35.3626 6.9 52.2 -159.8 -2.7229 -1.7 4.1 Her X-1
170.6806 -16.0753 4.1 44.3 41.0 5.3926 2.8 ------ UNKNOWN
177.3928 -2.8125 2.7 34.7 59.0 5.0010 4.4 ------ UNKNOWN
214.9370 24.0713 3.0 22.9 163.0 2.1248 3.8 ------ UNKNOWN
234.0476 17.3489 2.2 27.0 -151.8 3.2529 5.2 ------ UNKNOWN
236.3371 8.2757 2.7 25.3 -130.9 2.6990 4.3 ------ UNKNOWN
251.0218 3.6946 3.3 39.2 -118.4 4.4133 3.5 ------ UNKNOWN
Plot creation:
Sat May 30 14:46:24 EDT 2015