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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
66.4760 -77.2567 0.0048 30.9646 178.7838 1.8648005 40.229 TRIG_00437016
Foreground time interval of the image:
-0.252 10.373 (delta_t = 10.625 [sec])
Background time interval of the image:
-239.128 -0.252 (delta_t = 238.876 [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 0.256000
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 0.256000
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 0.256000
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 -0.252 sec. to 20.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83484 ( -0.071146 0.0719284 )
Norm@50keV : 8.17967E-03 ( -0.000338913 0.000337552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.86 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.971461e-01
Photon flux (15-150 keV) in 20.38 sec: 1.14273 ( -0.0469137 0.0470262 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53318e-06 ( -6.40906e-08 6.43142e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.252 sec. to 20.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15210 ( -0.320906 0.299258 )
Epeak [keV] : 60.3440 ( -6.94553 12.1691 )
Norm@50keV : 1.82095E-02 ( -0.00527913 0.00814343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.30 using 59 PHA bins.
# Reduced chi-squared = 0.8803 for 56 degrees of freedom
# Null hypothesis probability = 7.247078e-01
Photon flux (15-150 keV) in 20.38 sec: 1.09429 ( -0.05072 0.05088 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45408e-06 ( -7.19618e-08 7.22838e-08 ) ergs/cm2
Band function
Time interval is from -0.252 sec. to 20.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15202 ( -0.318231 0.340546 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 60.3312 ( -6.74443 12.1557 )
Norm@50keV : 1.82095E-02 ( -0.00528393 0.00814259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.30 using 59 PHA bins.
# Reduced chi-squared = 0.8963 for 55 degrees of freedom
# Null hypothesis probability = 6.913140e-01
Photon flux (15-150 keV) in 20.38 sec: 1.10843 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45413e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8067 ( )
R^2/D10^2 : 0.208257 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 163.40 using 59 PHA bins.
# Reduced chi-squared = 2.8666 for 57 degrees of freedom
# Null hypothesis probability = 3.313193e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.476e-07 1.093e-08
25- 50 5.003e-07 2.283e-08
50-150 5.142e-07 4.280e-08
15-150 1.162e-06 5.187e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.1180 (-13.1221 16.6074)
Norm : 5.00426 (-0.289297 0.312698)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.99 using 59 PHA bins.
# Reduced chi-squared = 0.8770 for 57 degrees of freedom
# Null hypothesis probability = 7.331728e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.666e-07 2.170e-08
25- 50 4.601e-07 2.405e-08
50-150 7.419e-07 1.900e-07
15-150 1.469e-06 1.991e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.16458 (-0.868814 0.945042)
R1^2/D10^2 : 1.92470 (-0.754836 1.47583)
kT2 [keV] : 19.8835 (-2.08363 2.76011)
R2^2/D10^2 : 3.10480E-02 (-0.0129759 0.0183866)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8740 for 55 degrees of freedom
# Null hypothesis probability = 7.345139e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.540e-07 4.300e-08
25- 50 4.573e-07 4.504e-08
50-150 7.246e-07 1.051e-07
15-150 1.436e-06 1.886e-07
Peak spectrum fit
Power-law model
Time interval is from 9.392 sec. to 10.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52880 ( -0.072084 0.0725307 )
Norm@50keV : 4.50417E-02 ( -0.00206016 0.00205716 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.53 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 57 degrees of freedom
# Null hypothesis probability = 3.658779e-02
Photon flux (15-150 keV) in 1 sec: 5.66765 ( -0.261104 0.261336 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.25354e-07 ( -2.08546e-08 2.09167e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.392 sec. to 10.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.422248 ( -0.366725 0.338401 )
Epeak [keV] : 72.1259 ( -7.29079 11.2516 )
Norm@50keV : 0.161036 ( -0.0509014 0.0822928 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.74 using 59 PHA bins.
# Reduced chi-squared = 0.7275 for 56 degrees of freedom
# Null hypothesis probability = 9.375225e-01
Photon flux (15-150 keV) in 1 sec: 5.44164 ( -0.26915 0.26933 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00476e-07 ( -2.2354e-08 2.2435e-08 ) ergs/cm2
Band function
Time interval is from 9.392 sec. to 10.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.422136 ( -0.224827 0.5305 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 72.1116 ( -7.21833 11.2663 )
Norm@50keV : 0.161062 ( -0.0509808 0.0823889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.74 using 59 PHA bins.
# Reduced chi-squared = 0.7407 for 55 degrees of freedom
# Null hypothesis probability = 9.242147e-01
Photon flux (15-150 keV) in 1 sec: 5.47107 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01313e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.9546 (-0.74932 0.790918)
R^2/D10^2 : 0.674652 (-0.113439 0.135357)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.38 using 59 PHA bins.
# Reduced chi-squared = 1.638 for 57 degrees of freedom
# Null hypothesis probability = 1.689831e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.160e-08 2.695e-09
25- 50 1.252e-07 6.400e-09
50-150 1.903e-07 1.580e-08
15-150 3.472e-07 1.745e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.018 (-39.7115 -199.036)
Norm : 23.3654 (-1.03802 1.10464)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.949751e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.819e-08 3.205e-09
25- 50 1.119e-07 6.700e-09
50-150 2.453e-07 4.265e-08
15-150 4.154e-07 4.470e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.78177 (-1.62675 1.80987)
R1^2/D10^2 : 3.36377 (-1.42975 3.37582)
kT2 [keV] : 22.0144 (-2.98082 5.10317)
R2^2/D10^2 : 0.127044 (-0.0753604 0.110704)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7285 for 55 degrees of freedom
# Null hypothesis probability = 9.347885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.745e-08 9.900e-09
25- 50 1.204e-07 1.771e-08
50-150 2.326e-07 6.100e-08
15-150 4.004e-07 8.670e-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: 1.66483 ( -0.0703158 0.0708362 )
Norm@50keV : 1.14433E-02 ( -0.00047584 0.000474827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.16 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 57 degrees of freedom
# Null hypothesis probability = 1.296020e-01
Photon flux (15-150 keV) in 10.62 sec: 1.50160 ( -0.063538 0.0636542 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12863e-06 ( -4.92041e-08 4.93542e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.852986 ( -0.332983 0.309554 )
Epeak [keV] : 71.0206 ( -8.22344 14.6456 )
Norm@50keV : 2.90118E-02 ( -0.00849146 0.0131635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.76 using 59 PHA bins.
# Reduced chi-squared = 0.8349 for 56 degrees of freedom
# Null hypothesis probability = 8.058879e-01
Photon flux (15-150 keV) in 10.62 sec: 1.43582 ( -0.0675 0.06765 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06831e-06 ( -5.4128e-08 5.42682e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.852915 ( -0.253313 0.356887 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 71.0065 ( -7.61139 14.6362 )
Norm@50keV : 2.90130E-02 ( -0.00849899 0.0131635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.76 using 59 PHA bins.
# Reduced chi-squared = 0.8501 for 55 degrees of freedom
# Null hypothesis probability = 7.777742e-01
Photon flux (15-150 keV) in 10.62 sec: 1.44595 ( 5.55405 -0.06506 ) 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) = 4.37e-07
S(50-100 keV) = 4.90e-07
T90 vs. Hardness ratio plot
T90 = 18.6919999718666 sec.
Hardness ratio (energy fluence ratio) = 1.12128
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.24743
Count Ratio (50-100 keV) / (15-25 keV) = 0.785832
Mask shadow pattern
IMX = -5.998838619391779E-01, IMY = -1.273589604537065E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.256000
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:
-239.128000 -0.252000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6951 -62.6380 32.0 47.1 -129.1 -0.2919 -0.4 8.0 GX 301-2
255.9905 -37.8322 1.5 44.6 -60.5 6.1398 7.9 0.7 4U 1700-377
264.9612 -44.4593 7.4 35.3 -57.4 0.4827 1.6 9.4 4U 1735-44
270.1806 -25.0724 25.3 50.3 -37.9 0.2947 0.5 5.6 GX 5-1
270.4789 -25.6189 7.5 49.7 -37.9 -0.9017 -1.6 12.1 GRS 1758-258
275.7195 -30.4969 312.1 43.4 -34.8 -0.0116 -0.0 13.2 H1820-303
285.1626 -24.7680 22.4 45.7 -20.7 0.1727 0.5 11.5 HT1900.1-2455
263.0286 -33.8398 2.6 45.2 -50.7 2.3943 4.5 2.0 GX 354-0
11.9400 -44.7592 2.9 35.5 104.2 1.6249 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.252000 10.372600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6053 -62.7634 14.3 47.0 -129.2 0.1402 0.8 1.5 GX 301-2
256.0439 -37.7857 6.3 44.6 -60.5 -0.2986 -1.8 4.4 4U 1700-377
264.6898 -44.3055 3.1 35.6 -57.5 0.2286 3.7 9.0 4U 1735-44
270.3539 -25.0951 8.6 50.2 -37.7 -0.1797 -1.3 3.9 GX 5-1
270.4435 -25.7102 8.8 49.6 -38.0 0.1705 1.3 7.9 GRS 1758-258
276.1243 -30.2360 5.1 43.5 -34.2 -0.1629 -2.3 13.0 H1820-303
285.1042 -24.7713 51.9 45.7 -20.8 -0.0155 -0.2 9.7 HT1900.1-2455
262.8462 -33.7719 5.1 45.3 -50.8 -0.2637 -2.3 8.1 GX 354-0
66.4759 -77.2567 0.3 31.0 178.8 1.8647 40.2 ------ UNKNOWN
288.7990 -41.1448 2.2 29.3 -25.8 0.2246 5.3 ------ UNKNOWN
280.0401 -19.8748 2.8 51.8 -24.6 0.4232 4.2 ------ UNKNOWN
189.0198 -61.7762 2.6 47.4 -127.2 0.8161 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
61.372600 713.272600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.6565 -40.5939 10.3 46.0 -152.6 0.9285 1.1 6.3 Vela X-1
170.2791 -60.6285 1.5 34.5 -110.3 5.2411 7.7 1.1 Cen X-3
186.6178 -62.7406 4.2 35.3 -96.4 2.5595 2.8 2.1 GX 301-2
92.0062 -25.4511 3.1 53.2 156.0 7.1981 3.8 ------ UNKNOWN
2.5478 -61.7493 2.5 25.2 38.1 2.0501 4.6 ------ UNKNOWN
150.2312 -51.6255 3.2 38.8 -133.2 2.3847 3.6 ------ UNKNOWN
194.6300 -58.1504 5.1 40.8 -92.5 4.6149 2.3 ------ UNKNOWN
Plot creation:
Sat May 30 23:35:23 EDT 2015