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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
257.7580 36.5550 0.0195 45.3239 -21.5819 1.0100310 9.904 TRIG_00504215
Foreground time interval of the image:
-1.088 27.876 (delta_t = 28.964 [sec])
Background time interval of the image:
-239.200 -1.088 (delta_t = 238.112 [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 8.192000
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 8.192000
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 8.192000
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 -1.088 sec. to 27.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03884 ( -0.313208 0.289158 )
Norm@50keV : 2.27228E-03 ( -0.000400974 0.000388798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.7891 for 57 degrees of freedom
# Null hypothesis probability = 8.754801e-01
Photon flux (15-150 keV) in 28.96 sec: 0.262198 ( -0.0474578 0.0484652 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02037e-07 ( -1.11026e-07 1.11195e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.088 sec. to 27.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12650 ( )
Epeak [keV] : 43.6180 ( )
Norm@50keV : 2.03014E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.57 using 59 PHA bins.
# Reduced chi-squared = 0.7960 for 56 degrees of freedom
# Null hypothesis probability = 8.641337e-01
Photon flux (15-150 keV) in 28.96 sec: 0.262117 ( -0.051197 0.048421 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01287e-07 ( -1.13257e-07 1.12072e-07 ) ergs/cm2
Band function
Time interval is from -1.088 sec. to 27.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834374 ( 0.834374 0.834374 )
beta : -1.03884 ( 1.03884 0.313588 )
Epeak [keV] : 50.0868 ( -50.0868 -50.0868 )
Norm@50keV : 3.97807E-03 ( -0.00206793 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8178 for 55 degrees of freedom
# Null hypothesis probability = 8.304188e-01
Photon flux (15-150 keV) in 28.96 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] : 25.2189 (-4.9955 7.26489)
R^2/D10^2 : 5.92243E-03 (-0.00323846 0.00625397)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.61 using 59 PHA bins.
# Reduced chi-squared = 0.9055 for 57 degrees of freedom
# Null hypothesis probability = 6.766615e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.886e-08 7.131e-09
25- 50 1.075e-07 3.197e-08
50-150 5.062e-07 1.497e-07
15-150 6.326e-07 1.629e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.17188 (-0.192023 0.191902)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.97 using 59 PHA bins.
# Reduced chi-squared = 0.9643 for 57 degrees of freedom
# Null hypothesis probability = 5.517471e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.451e-08 4.904e-08
25- 50 1.626e-07 9.228e-08
50-150 3.566e-07 1.992e-07
15-150 6.036e-07 3.401e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.57290 (-4.69967 8.61588)
R1^2/D10^2 : 0.103447 (-0.0652771 1.98266)
kT2 [keV] : 37.7198 (-12.689 -37.72)
R2^2/D10^2 : 1.50220E-03 (-0.00144722 0.0042123)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.82 using 59 PHA bins.
# Reduced chi-squared = 0.8149 for 55 degrees of freedom
# Null hypothesis probability = 8.347843e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.004e-08 2.928e-08
25- 50 1.378e-07 7.386e-08
50-150 5.219e-07 2.877e-07
15-150 7.098e-07 3.658e-07
Peak spectrum fit
Power-law model
Time interval is from 6.840 sec. to 7.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49836 ( -0.478356 0.468599 )
Norm@50keV : 7.12026E-03 ( -0.00196869 0.00196751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.60 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.814083e-01
Photon flux (15-150 keV) in 1 sec: 0.888486 ( -0.261379 0.265919 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75651e-08 ( -1.94349e-08 1.96598e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.840 sec. to 7.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.252120 ( -3.74543 1.61459 )
Epeak [keV] : 71.6772 ( -46.8861 -71.6767 )
Norm@50keV : 2.90796E-02 ( -0.0290805 1.71167 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.62 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 56 degrees of freedom
# Null hypothesis probability = 3.796965e-01
Photon flux (15-150 keV) in 1 sec: 0.837960 ( -0.274609 0.27959 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25261e-08 ( -2.10297e-08 2.09672e-08 ) ergs/cm2
Band function
Time interval is from 6.840 sec. to 7.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.310206 ( 0.295054 4.95642 )
beta : -2.21616 ( 2.09651 0.963005 )
Epeak [keV] : 59.9942 ( -59.688 162.221 )
Norm@50keV : 6.05755E-02 ( -0.0630937 81.3166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.40 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.514912e-01
Photon flux (15-150 keV) in 1 sec: 0.830561 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31633e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.3225 (-3.94893 5.97386)
R^2/D10^2 : 9.65321E-02 (-0.0675752 0.18824)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.54 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.833072e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.727e-09 2.812e-09
25- 50 1.915e-08 1.069e-08
50-150 3.089e-08 1.867e-08
15-150 5.476e-08 2.485e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 3.68812 (-1.0125 1.35822)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.18 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.957902e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.184e-09 5.570e-09
25- 50 1.767e-08 1.048e-08
50-150 3.875e-08 2.281e-08
15-150 6.559e-08 3.861e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.8133 (-10.9466 8.42226)
R1^2/D10^2 : 0.234924 (-0.224553 -0.224553)
kT2 [keV] : 32.2593 (-35.8641 -35.8641)
R2^2/D10^2 : 3.83524E-03 (-0.00238753 0.218557)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.44 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.502058e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.315e-09 4.281e-09
25- 50 1.960e-08 1.162e-08
50-150 3.727e-08 2.292e-08
15-150 6.318e-08 3.905e-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: 1.03884 ( -0.313208 0.289158 )
Norm@50keV : 2.27228E-03 ( -0.000400974 0.000388798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.7891 for 57 degrees of freedom
# Null hypothesis probability = 8.754801e-01
Photon flux (15-150 keV) in 28.96 sec: 0.262198 ( -0.0474578 0.0484652 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02037e-07 ( -1.11026e-07 1.11195e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12650 ( )
Epeak [keV] : 43.6180 ( )
Norm@50keV : 2.03014E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.57 using 59 PHA bins.
# Reduced chi-squared = 0.7960 for 56 degrees of freedom
# Null hypothesis probability = 8.641337e-01
Photon flux (15-150 keV) in 28.96 sec: 0.262117 ( -0.051197 0.048421 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.01287e-07 ( -1.13257e-07 1.12072e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834374 ( 0.834374 0.834374 )
beta : -1.03884 ( 1.03884 0.313588 )
Epeak [keV] : 50.0868 ( -50.0868 -50.0868 )
Norm@50keV : 3.97807E-03 ( -0.00206793 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8178 for 55 degrees of freedom
# Null hypothesis probability = 8.304188e-01
Photon flux (15-150 keV) in 28.96 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) = 1.33e-07
S(50-100 keV) = 2.60e-07
T90 vs. Hardness ratio plot
T90 = 20.879999935627 sec.
Hardness ratio (energy fluence ratio) = 1.95489
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.85652
Count Ratio (50-100 keV) / (15-25 keV) = 2.45206
Mask shadow pattern
IMX = 9.404664190719637E-01, IMY = 3.720125006224086E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 8.192000
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:
-239.200000 -1.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9737 -15.6398 0.7 38.2 -106.2 7.5940 15.5 0.3 Sco X-1
254.3376 35.2743 6.3 46.0 -25.8 0.6915 1.8 7.2 Her X-1
256.0084 -37.8603 2.0 42.0 -143.8 1.9391 5.8 1.4 4U 1700-377
256.4275 -36.4212 11.1 40.7 -142.8 0.3436 1.0 0.4 GX 349+2
263.1000 -24.6516 10.0 28.1 -136.7 0.2605 1.1 7.5 GX 1+4
264.8339 -44.6046 4.6 44.2 -157.3 0.8233 2.5 10.1 4U 1735-44
268.4534 -1.5914 5.2 13.2 -78.7 0.4467 2.2 9.8 SW J1753.5-0127
270.1457 -25.1807 35.7 24.8 -149.1 -0.0615 -0.3 9.7 GX 5-1
270.2788 -25.7149 5.1 25.2 -150.0 0.4712 2.5 2.1 GRS 1758-258
274.0864 -14.0327 2.7 13.3 -141.1 0.8013 4.3 4.7 GX 17+2
275.7523 -30.2267 4.3 27.8 -163.6 0.5252 2.7 12.3 H1820-303
285.1763 -24.9370 5.2 22.2 176.9 0.4264 2.2 7.7 HT1900.1-2455
288.8247 11.0430 2.2 15.8 32.7 0.9931 5.3 6.1 GRS 1915+105
299.6490 35.2070 2.7 41.8 27.9 1.6623 4.3 2.9 Cyg X-1
308.0385 40.9720 10.3 50.1 31.6 1.1954 1.1 3.5 Cyg X-3
262.8656 -33.8040 4.6 35.4 -147.1 0.6221 2.5 6.4 GX 354-0
319.6476 6.5064 2.9 39.2 81.5 2.9757 4.0 ------ UNKNOWN
255.1444 23.3479 2.7 36.8 -37.4 1.2174 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.088000 27.876000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0152 -15.5218 6.7 38.1 -106.0 0.2585 1.7 7.4 Sco X-1
254.5883 35.3853 7.9 45.9 -25.4 -0.1654 -1.5 6.9 Her X-1
256.0210 -37.8038 9.5 42.0 -143.8 0.1232 1.2 2.9 4U 1700-377
256.5989 -36.5064 10.1 40.7 -143.1 0.1115 1.1 9.3 GX 349+2
262.8699 -24.7004 6.0 28.2 -136.4 -0.1285 -1.9 8.0 GX 1+4
264.8418 -44.5156 36.2 44.1 -157.3 -0.0299 -0.3 5.8 4U 1735-44
268.2278 -1.5767 6.0 13.4 -78.8 0.1054 1.9 11.2 SW J1753.5-0127
270.2130 -25.2174 3.5 24.8 -149.3 0.2087 3.3 9.1 GX 5-1
270.2498 -25.8899 24.7 25.4 -150.1 0.0287 0.5 9.3 GRS 1758-258
274.0944 -14.1126 31.7 13.4 -141.4 -0.0197 -0.4 6.9 GX 17+2
275.7547 -30.2471 6.6 27.8 -163.6 -0.1026 -1.7 11.4 H1820-303
285.0615 -25.0626 50.4 22.4 177.2 0.0134 0.2 8.6 HT1900.1-2455
288.7713 10.8509 16.8 15.6 32.9 0.0409 0.7 5.9 GRS 1915+105
299.4391 35.2110 16.9 41.7 27.7 0.0752 0.7 7.4 Cyg X-1
308.1278 40.9424 2.3 50.1 31.7 1.3535 5.0 1.0 Cyg X-3
262.8258 -33.7592 43.3 35.4 -147.0 0.0199 0.3 9.3 GX 354-0
257.7591 36.5542 1.2 45.3 -21.6 1.0245 10.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
359.100600 962.835500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
31.9618 -16.5955 2.3 10.5 122.9 1.4641 5.0 ------ UNKNOWN
45.3241 -13.3780 2.9 18.2 169.3 1.1540 4.0 ------ UNKNOWN
327.8559 -43.5322 2.7 53.8 -0.0 4.2199 4.3 ------ UNKNOWN
85.3579 2.8486 3.2 59.1 -166.1 8.5270 3.6 ------ UNKNOWN
83.1840 -16.3163 4.0 48.0 -146.4 2.5072 2.9 ------ UNKNOWN
1.7016 -75.3596 4.1 50.6 -44.6 4.8919 2.9 ------ UNKNOWN
51.8836 -69.3882 3.7 43.8 -64.0 5.6062 3.2 ------ UNKNOWN
Plot creation:
Sat May 30 21:32:22 EDT 2015