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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
330.9949 -17.9366 0.0111 36.2914 -127.0703 4.4604631 17.294 TRIG_00584136
Foreground time interval of the image:
-73.608 29.368 (delta_t = 102.976 [sec])
Background time interval of the image:
-239.272 -73.608 (delta_t = 165.664 [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 4.096000
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 4.096000
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 4.096000
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 -73.608 sec. to 29.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87224 ( -0.130094 0.13364 )
Norm@50keV : 2.70762E-03 ( -0.000221524 0.000218658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 0.9999 for 57 degrees of freedom
# Null hypothesis probability = 4.752809e-01
Photon flux (15-150 keV) in 103 sec: 0.384073 ( -0.0276303 0.0276623 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5638e-06 ( -2.07764e-07 2.09964e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -73.608 sec. to 29.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35692 ( -0.634233 0.545553 )
Epeak [keV] : 55.5954 ( -13.0827 -55.5964 )
Norm@50keV : 5.19562E-03 ( -0.00253821 0.0063275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.44 using 59 PHA bins.
# Reduced chi-squared = 0.9721 for 56 degrees of freedom
# Null hypothesis probability = 5.342788e-01
Photon flux (15-150 keV) in 103 sec: 0.374561 ( -0.029447 0.029366 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43974e-06 ( -2.43131e-07 2.47025e-07 ) ergs/cm2
Band function
Time interval is from -73.608 sec. to 29.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13877 ( -0.680379 5.20481 )
beta : -2.26717 ( 2.25544 0.406421 )
Epeak [keV] : 48.8956 ( -22.8016 93.025 )
Norm@50keV : 7.07363E-03 ( -0.00233735 2.92065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.75 using 59 PHA bins.
# Reduced chi-squared = 0.9772 for 55 degrees of freedom
# Null hypothesis probability = 5.226203e-01
Photon flux (15-150 keV) in 103 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44867e-06 ( -2.44795e-06 -2.33388e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2598 (-0.918922 1.00748)
R^2/D10^2 : 0.114062 (-0.0316364 0.0434231)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.73 using 59 PHA bins.
# Reduced chi-squared = 1.557 for 57 degrees of freedom
# Null hypothesis probability = 4.520814e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.126e-07 4.182e-08
25- 50 9.104e-07 8.111e-08
50-150 6.636e-07 1.197e-07
15-150 1.887e-06 1.643e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 86.1936 (-18.9275 28.67)
Norm : 1.75475 (-0.185042 0.213692)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.42 using 59 PHA bins.
# Reduced chi-squared = 0.9548 for 57 degrees of freedom
# Null hypothesis probability = 5.723434e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.709e-07 5.371e-08
25- 50 7.887e-07 6.633e-08
50-150 1.169e-06 4.104e-07
15-150 2.429e-06 4.233e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.13565 (-1.93027 2.41781)
R1^2/D10^2 : 0.708224 (-0.437693 2.04596)
kT2 [keV] : 19.2452 (-4.8708 16.8392)
R2^2/D10^2 : 1.08854E-02 (-0.00930927 0.0255335)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.809910e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.578e-07 1.959e-07
25- 50 7.884e-07 2.669e-07
50-150 1.115e-06 5.748e-07
15-150 2.361e-06 8.110e-07
Peak spectrum fit
Power-law model
Time interval is from 2.984 sec. to 3.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71658 ( -0.255243 0.267213 )
Norm@50keV : 1.44921E-02 ( -0.00236442 0.00230367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.14 using 59 PHA bins.
# Reduced chi-squared = 0.9498 for 57 degrees of freedom
# Null hypothesis probability = 5.831314e-01
Photon flux (15-150 keV) in 1 sec: 1.93599 ( -0.284335 0.284551 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34012e-07 ( -2.25287e-08 2.28345e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.984 sec. to 3.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72154 ( -0.404692 0.26467 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 1.44726E-02 ( -0.00236492 0.0279414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.14 using 59 PHA bins.
# Reduced chi-squared = 0.9668 for 56 degrees of freedom
# Null hypothesis probability = 5.455747e-01
Photon flux (15-150 keV) in 1 sec: 1.93629 ( -0.28453 0.28359 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33544e-07 ( -2.3466e-08 2.32e-08 ) ergs/cm2
Band function
Time interval is from 2.984 sec. to 3.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.29617 ( -0.912606 -0.912606 )
beta : -1.73312 ( 1.73054 0.265895 )
Epeak [keV] : 19.1117 ( -20.9792 348.293 )
Norm@50keV : 362.742 ( -362.917 2.78096e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9831 for 55 degrees of freedom
# Null hypothesis probability = 5.101050e-01
Photon flux (15-150 keV) in 1 sec: 1.93213 ( ) 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] : 13.3853 (-2.87245 3.40686)
R^2/D10^2 : 0.309960 (-0.308089 0.427672)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.15 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 57 degrees of freedom
# Null hypothesis probability = 7.340693e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.177e-08 3.820e-09
25- 50 4.181e-08 9.370e-09
50-150 4.815e-08 1.646e-08
15-150 1.017e-07 2.298e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 142.906 (-66.3117 -140.986)
Norm : 7.97253 (-1.29423 1.80825)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.93 using 59 PHA bins.
# Reduced chi-squared = 0.9637 for 57 degrees of freedom
# Null hypothesis probability = 5.530936e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.056e-08 1.139e-08
25- 50 3.783e-08 2.056e-08
50-150 7.316e-08 4.458e-08
15-150 1.316e-07 7.620e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29686 (-1.67828 2.21227)
R1^2/D10^2 : 6.83213 (-5.01719 27.7861)
kT2 [keV] : 23.6722 (-6.46656 13.9352)
R2^2/D10^2 : 3.27874E-02 (-0.0260035 0.0431254)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9668 for 55 degrees of freedom
# Null hypothesis probability = 5.446520e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.410e-08 1.337e-08
25- 50 3.373e-08 1.516e-08
50-150 7.647e-08 4.423e-08
15-150 1.343e-07 6.493e-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: 1.87224 ( -0.130094 0.13364 )
Norm@50keV : 2.70762E-03 ( -0.000221524 0.000218658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 0.9999 for 57 degrees of freedom
# Null hypothesis probability = 4.752809e-01
Photon flux (15-150 keV) in 103 sec: 0.384073 ( -0.0276303 0.0276623 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5638e-06 ( -2.07764e-07 2.09964e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35692 ( -0.634233 0.545553 )
Epeak [keV] : 55.5954 ( -13.0827 -55.5964 )
Norm@50keV : 5.19562E-03 ( -0.00253821 0.0063275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.44 using 59 PHA bins.
# Reduced chi-squared = 0.9721 for 56 degrees of freedom
# Null hypothesis probability = 5.342788e-01
Photon flux (15-150 keV) in 103 sec: 0.374561 ( -0.029447 0.029366 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43974e-06 ( -2.43131e-07 2.47025e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13877 ( -0.9122 5.20714 )
beta : -2.26717 ( 2.25544 0.406421 )
Epeak [keV] : 48.8956 ( -22.8016 91.8751 )
Norm@50keV : 7.07363E-03 ( -0.00233735 2.90197 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.75 using 59 PHA bins.
# Reduced chi-squared = 0.9772 for 55 degrees of freedom
# Null hypothesis probability = 5.226203e-01
Photon flux (15-150 keV) in 103 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44867e-06 ( -2.44795e-06 -2.33388e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.41e-07
S(50-100 keV) = 8.10e-07
T90 vs. Hardness ratio plot
T90 = 84.0919999480247 sec.
Hardness ratio (energy fluence ratio) = 1.09312
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.24477
Count Ratio (50-100 keV) / (15-25 keV) = 0.68935
Mask shadow pattern
IMX = -4.426582386676653E-01, IMY = 5.859297902425955E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.272000 -73.608000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.4921 35.2083 2.9 43.5 -22.9 1.1002 4.0 4.8 Cyg X-1
308.0820 41.0314 2.8 39.3 -11.0 0.9659 4.2 4.9 Cyg X-3
326.1054 38.3295 2.4 26.9 1.4 0.8773 4.8 3.2 Cyg X-2
308.0604 37.6114 2.2 37.8 -15.9 1.0908 5.2 ------ UNKNOWN
355.3846 -23.6250 3.1 41.5 -164.0 1.0163 3.7 ------ UNKNOWN
293.6315 15.4907 4.3 47.8 -51.0 2.2469 2.7 ------ UNKNOWN
328.9294 -30.1498 2.4 48.4 -130.5 3.9122 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-73.608000 29.368000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5367 35.4073 0.0 43.5 -22.6 -0.4750 -1.9 12.6 Cyg X-1
307.9522 41.0306 6.0 39.4 -11.1 -0.4070 -1.9 8.5 Cyg X-3
326.4265 38.2952 0.0 26.7 1.8 0.3140 1.9 12.1 Cyg X-2
7.4811 28.3132 2.4 25.2 89.8 0.9675 4.8 ------ UNKNOWN
330.9961 -17.9381 0.7 36.3 -127.1 4.4522 17.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
909.228590 962.769600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5010 -40.4862 2.5 47.8 149.7 1.4678 4.5 4.3 Vela X-1
170.5079 -60.6493 6.1 48.8 -170.6 -0.3746 -1.9 5.9 Cen X-3
186.4770 -62.8121 15.4 51.9 -161.2 -0.1683 -0.8 5.5 GX 301-2
Plot creation:
Sat May 30 14:38:46 EDT 2015