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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.5166 8.6815 0.0125 23.7030 117.8942 1.1165221 15.412 TRIG_00518200
Foreground time interval of the image:
-0.016 29.856 (delta_t = 29.872 [sec])
Background time interval of the image:
-239.616 -0.016 (delta_t = 239.600 [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 26.880000
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 26.880000
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 26.880000
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 -0.016 sec. to 29.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57166 ( -0.182645 0.184875 )
Norm@50keV : 2.19649E-03 ( -0.000246774 0.00024529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.13 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.408850e-01
Photon flux (15-150 keV) in 29.87 sec: 0.279837 ( -0.0307238 0.0307924 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15833e-07 ( -7.40471e-08 7.50194e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 29.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.313765 ( -1.05251 0.841526 )
Epeak [keV] : 63.2855 ( -11.9922 35.8908 )
Norm@50keV : 9.96298E-03 ( -0.00626168 0.0248162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.379510e-01
Photon flux (15-150 keV) in 29.87 sec: 0.263654 ( -0.032336 0.032451 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52831e-07 ( -8.05086e-08 8.43559e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 29.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.313642 ( -0.661396 1.14057 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 63.2727 ( -11.0067 35.8849 )
Norm@50keV : 9.96515E-03 ( -0.00626419 0.0248946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.008561e-01
Photon flux (15-150 keV) in 29.87 sec: 0.266353 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.53443e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7346 (-1.60299 1.8561)
R^2/D10^2 : 4.35044E-02 (-0.0159825 0.0246372)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.04 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.431191e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.186e-08 1.141e-08
25- 50 1.892e-07 2.646e-08
50-150 2.327e-07 5.073e-08
15-150 4.738e-07 7.049e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.938 (-62.7132 -162.677)
Norm : 1.16241 (-0.134983 0.15765)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.53 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.496688e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.845e-08 4.938e-08
25- 50 1.660e-07 8.852e-08
50-150 3.395e-07 1.925e-07
15-150 5.939e-07 3.230e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.47994 (-3.29541 42.7455)
R1^2/D10^2 : 0.193159 (-0.131885 1.03765)
kT2 [keV] : 20.2756 (-5.45242 29.9442)
R2^2/D10^2 : 7.88115E-03 (-0.00762453 0.0137839)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.44 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.208066e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.382e-08 4.143e-08
25- 50 1.790e-07 9.095e-08
50-150 3.027e-07 1.701e-07
15-150 5.556e-07 2.839e-07
Peak spectrum fit
Power-law model
Time interval is from 24.096 sec. to 25.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16338 ( -0.577085 0.528555 )
Norm@50keV : 4.41818E-03 ( -0.00132342 0.00131253 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.16 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.900653e-01
Photon flux (15-150 keV) in 1 sec: 0.516098 ( -0.160381 0.162797 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53002e-08 ( -1.41784e-08 1.44294e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.096 sec. to 25.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.530083 ( -8.64316 7.37686 )
Epeak [keV] : 122.852 ( -122.768 -122.768 )
Norm@50keV : 8.86316E-03 ( -0.00887209 38.6465 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.05 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 56 degrees of freedom
# Null hypothesis probability = 1.685527e-01
Photon flux (15-150 keV) in 1 sec: 0.500255 ( -0.207998 0.17449 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31361e-08 ( -1.89485e-08 1.62391e-08 ) ergs/cm2
Band function
Time interval is from 24.096 sec. to 25.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.505867 ( 0.0910513 0.0910513 )
beta : -1.86986 ( 1.62965 0.972762 )
Epeak [keV] : 76.5099 ( -76.3016 240.122 )
Norm@50keV : 2.77164E-02 ( -0.0278759 16.0961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.53 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 55 degrees of freedom
# Null hypothesis probability = 1.564958e-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] : 17.6493 (-4.82662 8.78835)
R^2/D10^2 : 3.64944E-02 (-0.0364937 0.0726985)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.53 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.816584e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.290e-09 1.454e-09
25- 50 1.044e-08 6.201e-09
50-150 2.347e-08 1.598e-08
15-150 3.619e-08 2.214e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-106.734 -199.363)
Norm : 2.18385 (-0.65887 0.65887)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.58 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.593932e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.438e-09 3.369e-09
25- 50 1.046e-08 6.420e-09
50-150 2.294e-08 1.414e-08
15-150 3.884e-08 2.344e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.26 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.82 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.64 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.53 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 55 degrees of freedom
# Reduced chi-squared = 1.179 for 55 degrees of freedom
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Null hypothesis probability = 1.421082e-01
# Null hypothesis probability = 1.713575e-01
# Null hypothesis probability = 1.753614e-01
# Null hypothesis probability = 1.777370e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.346e-09 1.825e-09
25- 50 9.952e-09 5.995e-09
50-150 2.439e-08 1.576e-08
15-150 3.769e-08 2.223e-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: 1.57166 ( -0.182645 0.184875 )
Norm@50keV : 2.19649E-03 ( -0.000246774 0.00024529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.13 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.408850e-01
Photon flux (15-150 keV) in 29.87 sec: 0.279837 ( -0.0307238 0.0307924 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15833e-07 ( -7.40471e-08 7.50194e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.313765 ( -1.05251 0.841526 )
Epeak [keV] : 63.2855 ( -11.9922 35.8908 )
Norm@50keV : 9.96298E-03 ( -0.00626168 0.0248162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.379510e-01
Photon flux (15-150 keV) in 29.87 sec: 0.263654 ( -0.032336 0.032451 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52831e-07 ( -8.05086e-08 8.43559e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.313642 ( -0.661396 1.14057 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 63.2727 ( -11.0067 35.8849 )
Norm@50keV : 9.96515E-03 ( -0.00626419 0.0248946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.008561e-01
Photon flux (15-150 keV) in 29.87 sec: 0.266353 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.53443e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.58e-07
S(50-100 keV) = 2.12e-07
T90 vs. Hardness ratio plot
T90 = 24.9759999513626 sec.
Hardness ratio (energy fluence ratio) = 1.34177
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.31047
Count Ratio (50-100 keV) / (15-25 keV) = 0.969782
Mask shadow pattern
IMX = -2.053962601929236E-01, IMY = -3.880213364858037E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 26.880000
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:
-239.616000 -0.016000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9728 -15.6387 0.2 17.6 -86.9 17.6455 69.0 0.4 Sco X-1
254.4611 35.3767 4.9 50.9 -172.7 1.4637 2.4 2.1 Her X-1
256.0729 -37.9751 7.4 38.2 -56.9 0.7358 1.6 8.9 4U 1700-377
256.5297 -36.3130 6.8 37.4 -59.3 0.8297 1.7 8.0 GX 349+2
262.8184 -24.8450 0.0 36.5 -80.4 0.8863 1.6 12.0 GX 1+4
268.3585 -1.5706 4.9 40.6 -118.7 1.4202 2.3 7.1 SW J1753.5-0127
262.8927 -33.7747 10.6 40.3 -67.4 -0.7150 -1.1 6.0 GX 354-0
197.0102 18.2257 4.2 41.2 111.3 2.5349 2.7 ------ UNKNOWN
217.0223 -47.6052 2.5 39.6 -8.5 1.4571 4.6 ------ UNKNOWN
266.3770 31.8104 2.7 54.8 -160.4 3.0835 4.2 ------ UNKNOWN
269.8885 30.8267 3.0 56.5 -157.1 3.8119 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.016000 29.856000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1360 -15.5360 4.3 17.7 -87.4 0.1747 2.7 11.0 Sco X-1
254.4214 35.4891 8.3 51.0 -172.8 0.2042 1.4 9.0 Her X-1
255.9988 -37.7160 8.2 38.0 -57.1 -0.1615 -1.4 7.7 4U 1700-377
256.5541 -36.2997 112.9 37.4 -59.3 0.0116 0.1 9.4 GX 349+2
263.1903 -24.6862 6.1 36.7 -80.9 -0.2492 -1.9 10.5 GX 1+4
268.3156 -1.4148 56.6 40.6 -118.9 0.0317 0.2 3.9 SW J1753.5-0127
263.1368 -33.9566 0.0 40.5 -67.3 -0.5541 -3.2 10.4 GX 354-0
212.5166 8.6816 0.7 23.7 117.9 1.1165 15.4 ------ UNKNOWN
201.0140 -54.3044 2.3 50.1 0.0 0.6867 5.1 ------ UNKNOWN
210.0382 -54.8055 2.6 47.9 -6.3 0.4909 4.4 ------ UNKNOWN
222.0925 -56.4712 2.3 47.6 -15.8 0.5673 5.0 ------ UNKNOWN
254.4001 -54.3792 2.4 49.8 -40.0 0.9586 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
154.684590 962.510000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9754 -15.6332 0.3 40.3 -39.2 37.1548 42.1 0.5 Sco X-1
207.6997 13.1204 3.1 6.5 147.2 1.6755 3.8 ------ UNKNOWN
224.5604 -41.5813 2.4 51.5 2.4 5.9154 4.9 ------ UNKNOWN
211.1101 59.3227 3.5 50.7 -167.1 4.2325 3.3 ------ UNKNOWN
Plot creation:
Sat May 30 20:00:09 EDT 2015