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
5.7840 -5.6210 0.0240 37.5967 98.3201 3.4534263 8.008 TRIG_00156434
Foreground time interval of the image:
24.424 177.701 (delta_t = 153.277 [sec])
Background time interval of the image:
-299.000 24.424 (delta_t = 323.424 [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 168.000000
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 168.000000
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 168.000000
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 24.424 sec. to 273.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11410 ( -0.241773 0.262904 )
Norm@50keV : 1.02293E-03 ( -0.000178983 0.000173412 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.46 using 59 PHA bins.
# Reduced chi-squared = 0.9028 for 57 degrees of freedom
# Null hypothesis probability = 6.821570e-01
Photon flux (15-150 keV) in 249.2 sec: 0.162062 ( -0.0200982 0.0200997 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37177e-06 ( -3.62539e-07 3.73556e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.424 sec. to 273.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81639 ( -1.12351 0.278479 )
Epeak [keV] : 25.0496 ( -23.9617 -25.0489 )
Norm@50keV : 1.53249E-03 ( -0.000709 0.00556913 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.17 using 59 PHA bins.
# Reduced chi-squared = 0.9138 for 56 degrees of freedom
# Null hypothesis probability = 6.578694e-01
Photon flux (15-150 keV) in 249.2 sec: 0.160240 ( -0.020837 0.020655 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29776e-06 ( -4.1362e-07 4.26947e-07 ) ergs/cm2
Band function
Time interval is from 24.424 sec. to 273.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.80128 ( 1.76412 1.76412 )
beta : -2.52659 ( 2.51128 0.625508 )
Epeak [keV] : 25.5155 ( -25.5113 -25.5113 )
Norm@50keV : 1.56710E-03 ( -0.00058991 0.102194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.15 using 59 PHA bins.
# Reduced chi-squared = 0.9301 for 55 degrees of freedom
# Null hypothesis probability = 6.223382e-01
Photon flux (15-150 keV) in 249.2 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] : 9.14535 (-1.42102 1.66156)
R^2/D10^2 : 0.103316 (-0.0490915 0.0966809)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.59 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 57 degrees of freedom
# Null hypothesis probability = 1.803283e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.226e-07 8.722e-08
25- 50 9.209e-07 1.566e-07
50-150 3.689e-07 1.388e-07
15-150 1.712e-06 3.189e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.4166 (-17.3423 30.2492)
Norm : 0.876513 (-0.178493 0.229171)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.79 using 59 PHA bins.
# Reduced chi-squared = 0.9086 for 57 degrees of freedom
# Null hypothesis probability = 6.702085e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.413e-07 8.971e-08
25- 50 8.033e-07 1.220e-07
50-150 8.540e-07 2.994e-07
15-150 2.199e-06 3.905e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.52892 (-1.60322 1.98981)
R1^2/D10^2 : 1.14371 (-0.829164 7.38503)
kT2 [keV] : 15.6977 (-4.22036 9.49183)
R2^2/D10^2 : 9.53329E-03 (-0.00805051 0.0258457)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.17 using 59 PHA bins.
# Reduced chi-squared = 0.9304 for 55 degrees of freedom
# Null hypothesis probability = 6.217501e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.801e-07 3.096e-07
25- 50 7.358e-07 3.863e-07
50-150 8.657e-07 5.043e-07
15-150 2.182e-06 1.120e-06
Peak spectrum fit
Power-law model
Time interval is from 98.636 sec. to 99.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30268 ( -0.527472 0.512311 )
Norm@50keV : 9.14166E-03 ( -0.00276712 0.00276312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.04 using 59 PHA bins.
# Reduced chi-squared = 0.9481 for 57 degrees of freedom
# Null hypothesis probability = 5.867747e-01
Photon flux (15-150 keV) in 1 sec: 1.09118 ( -0.349132 0.354924 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.02772e-08 ( -2.84148e-08 2.86873e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 98.636 sec. to 99.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.457668 ( -3.34663 1.91574 )
Epeak [keV] : 108.361 ( -108.451 -108.451 )
Norm@50keV : 2.11034E-02 ( -0.0210779 0.293702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.48 using 59 PHA bins.
# Reduced chi-squared = 0.9550 for 56 degrees of freedom
# Null hypothesis probability = 5.707949e-01
Photon flux (15-150 keV) in 1 sec: 1.04582 ( -0.367557 0.36938 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.83496e-08 ( -2.91376e-08 2.92894e-08 ) ergs/cm2
Band function
Time interval is from 98.636 sec. to 99.636 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.563361 ( -2.78072 4.57482 )
beta : -9.37167 ( 9.37131 19.3713 )
Epeak [keV] : 117.728 ( -59.7249 354.993 )
Norm@50keV : 1.87788E-02 ( -0.0187775 206.835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.49 using 59 PHA bins.
# Reduced chi-squared = 0.9726 for 55 degrees of freedom
# Null hypothesis probability = 5.324228e-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] : 20.9114 (-6.32655 9.48292)
R^2/D10^2 : 4.34101E-02 (-0.0434101 0.10055)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.63 using 59 PHA bins.
# Reduced chi-squared = 0.9584 for 57 degrees of freedom
# Null hypothesis probability = 5.645213e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.593e-09 2.275e-09
25- 50 1.842e-08 1.123e-08
50-150 6.001e-08 4.081e-08
15-150 8.202e-08 5.315e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-111.611 -199.363)
Norm : 4.63655 (-1.4108 1.41084)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9572 for 57 degrees of freedom
# Null hypothesis probability = 5.670404e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.155e-08 7.060e-09
25- 50 2.221e-08 1.342e-08
50-150 4.871e-08 2.915e-08
15-150 8.246e-08 5.085e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.53375 (-5.50876 194.415)
R1^2/D10^2 : 2.04774 (-2.07135 -2.07135)
kT2 [keV] : 24.9646 (-8.37299 -24.9539)
R2^2/D10^2 : 2.16981E-02 (-0.0217315 0.0680892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.54 using 59 PHA bins.
# Reduced chi-squared = 0.9553 for 55 degrees of freedom
# Null hypothesis probability = 5.690469e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.699e-09 6.165e-09
25- 50 1.944e-08 1.061e-08
50-150 6.200e-08 3.955e-08
15-150 9.114e-08 5.190e-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: 2.02150 ( -0.245563 0.265558 )
Norm@50keV : 1.52781E-03 ( -0.000262237 0.000253207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.46 using 59 PHA bins.
# Reduced chi-squared = 0.8677 for 57 degrees of freedom
# Null hypothesis probability = 7.507459e-01
Photon flux (15-150 keV) in 153.3 sec: 0.231468 ( -0.0299095 0.0299185 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16256e-06 ( -3.38506e-07 3.4737e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79905 ( -1.06624 0.337302 )
Epeak [keV] : 38.7492 ( )
Norm@50keV : 2.04578E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.29 using 59 PHA bins.
# Reduced chi-squared = 0.8802 for 56 degrees of freedom
# Null hypothesis probability = 7.249897e-01
Photon flux (15-150 keV) in 153.3 sec: 0.229481 ( -0.030959 0.015469 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11795e-06 ( -3.76413e-07 3.80935e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.79896 ( -2.33819 1.00752 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 38.7194 ( -22.1122 -38.7196 )
Norm@50keV : 2.04584E-03 ( -0.000553656 0.00612734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.29 using 59 PHA bins.
# Reduced chi-squared = 0.8962 for 55 degrees of freedom
# Null hypothesis probability = 6.916161e-01
Photon flux (15-150 keV) in 153.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11697e-06 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.36e-07
S(50-100 keV) = 6.80e-07
T90 vs. Hardness ratio plot
T90 = 157.02399995923 sec.
Hardness ratio (energy fluence ratio) = 0.923913
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.0165
Count Ratio (50-100 keV) / (15-25 keV) = 0.528641
Mask shadow pattern
IMX = -1.114227923780043E-01, IMY = -7.619069414942475E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 168.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 168.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 168.000000
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:
-299.000000 24.424000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5862 35.2026 0.5 36.8 -87.8 11.4816 21.8 0.2 Cyg X-1
308.1217 40.9378 1.0 32.8 -73.9 3.7257 11.0 1.0 Cyg X-3
326.1069 38.2233 3.6 21.1 -56.3 0.6629 3.2 6.6 Cyg X-2
14.7746 14.2269 3.1 36.1 61.7 1.6430 3.7 ------ UNKNOWN
338.3435 -29.7706 3.5 49.4 148.0 2.9460 3.3 ------ UNKNOWN
32.0772 42.9002 2.7 51.1 19.2 3.0963 4.3 ------ UNKNOWN
347.5982 26.4752 2.4 11.6 20.8 0.8205 4.7 ------ UNKNOWN
358.4001 54.2854 3.5 38.2 -11.2 0.8016 3.3 ------ UNKNOWN
311.9930 58.5244 2.9 43.1 -50.1 2.0279 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
24.424000 177.700610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.7762 35.1921 6.6 36.6 -87.8 -0.5776 -1.7 9.1 Cyg X-1
308.1897 40.8372 4.8 32.7 -74.0 -0.5376 -2.4 7.8 Cyg X-3
326.3730 38.3074 8.7 21.0 -55.7 0.1924 1.3 9.5 Cyg X-2
5.7840 -5.6211 1.4 37.6 98.3 3.4531 8.0 483.5 UNKNOWN
318.5965 -15.9858 1.8 40.1 177.9 1.2657 6.3 ------ UNKNOWN
312.6483 17.7768 2.4 23.5 -121.2 0.6627 4.9 ------ UNKNOWN
304.4057 6.3190 2.5 34.7 -138.9 0.8697 4.7 ------ UNKNOWN
289.8006 2.2547 2.1 49.6 -135.2 3.3861 5.4 ------ UNKNOWN
289.1587 3.3656 2.2 49.8 -133.6 3.3744 5.3 ------ UNKNOWN
293.0344 28.3709 2.2 41.3 -99.9 2.8967 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Sun May 31 15:34:23 EDT 2015