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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.6525 0.0626 0.0105 25.1077 -139.9929 1.0743764 18.288 TRIG_00339696
Foreground time interval of the image:
-2.880 19.789 (delta_t = 22.669 [sec])
Background time interval of the image:
-239.112 -2.880 (delta_t = 236.232 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -2.880 sec. to 26.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28406 ( -0.158001 0.165797 )
Norm@50keV : 2.41804E-03 ( -0.000264247 0.000260292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.43 using 59 PHA bins.
# Reduced chi-squared = 0.8322 for 57 degrees of freedom
# Null hypothesis probability = 8.128211e-01
Photon flux (15-150 keV) in 28.92 sec: 0.418857 ( -0.031869 0.0318956 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.66334e-07 ( -5.94268e-08 6.06111e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.880 sec. to 26.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79312 ( -0.760212 0.415767 )
Epeak [keV] : 16.3566 ( -15.1433 16.2496 )
Norm@50keV : 4.75747E-03 ( -0.00165146 0.00888659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.74 using 59 PHA bins.
# Reduced chi-squared = 0.8168 for 56 degrees of freedom
# Null hypothesis probability = 8.343861e-01
Photon flux (15-150 keV) in 28.92 sec: 0.408904 ( -0.034191 0.034239 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2993e-07 ( -7.09639e-08 7.58369e-08 ) ergs/cm2
Band function
Time interval is from -2.880 sec. to 26.036 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78420 ( 1.78288 1.78288 )
beta : -2.96588 ( 3.04625 0.861346 )
Epeak [keV] : 16.7901 ( -16.7952 15.7843 )
Norm@50keV : 4.80655E-03 ( -0.00164997 0.129868 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.73 using 59 PHA bins.
# Reduced chi-squared = 0.8315 for 55 degrees of freedom
# Null hypothesis probability = 8.089717e-01
Photon flux (15-150 keV) in 28.92 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.29687e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.37745 (-0.745609 0.824253)
R^2/D10^2 : 0.364568 (-0.115461 0.169773)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.52 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.325281e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.382e-07 1.802e-08
25- 50 2.616e-07 2.423e-08
50-150 7.975e-08 2.007e-08
15-150 4.795e-07 4.396e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.0449 (-8.14703 11.0175)
Norm : 2.54065 (-0.37461 0.456357)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.82 using 59 PHA bins.
# Reduced chi-squared = 0.8215 for 57 degrees of freedom
# Null hypothesis probability = 8.297346e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.727e-07 1.774e-08
25- 50 2.343e-07 1.993e-08
50-150 1.960e-07 4.642e-08
15-150 6.030e-07 5.466e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.95206 (-1.18157 1.24728)
R1^2/D10^2 : 2.21196 (-1.25422 4.58063)
kT2 [keV] : 15.4772 (-3.55585 6.4625)
R2^2/D10^2 : 2.12300E-02 (-0.0163961 0.0471458)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8399 for 55 degrees of freedom
# Null hypothesis probability = 7.951902e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.803e-07 6.623e-08
25- 50 2.206e-07 7.084e-08
50-150 2.105e-07 1.183e-07
15-150 6.114e-07 2.319e-07
Peak spectrum fit
Power-law model
Time interval is from 10.708 sec. to 11.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77403 ( -0.316713 0.333234 )
Norm@50keV : 6.52003E-03 ( -0.00131613 0.00127437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.61 using 59 PHA bins.
# Reduced chi-squared = 0.8528 for 57 degrees of freedom
# Null hypothesis probability = 7.778578e-01
Photon flux (15-150 keV) in 1 sec: 0.889562 ( -0.155791 0.156022 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0088e-08 ( -1.21662e-08 1.25133e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.708 sec. to 11.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60850 ( -1.36542 0.781827 )
Epeak [keV] : 105.912 ( -106.406 -106.422 )
Norm@50keV : 8.04626E-03 ( -0.00804135 0.0381407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.54 using 59 PHA bins.
# Reduced chi-squared = 0.8668 for 56 degrees of freedom
# Null hypothesis probability = 7.501359e-01
Photon flux (15-150 keV) in 1 sec: 0.883149 ( -0.159669 0.160191 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.90984e-08 ( -1.38608e-08 1.32535e-08 ) ergs/cm2
Band function
Time interval is from 10.708 sec. to 11.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60905 ( 1.65819 1.27959 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 106.405 ( -74.1099 -106.405 )
Norm@50keV : 8.03942E-03 ( -0.00281781 0.0113627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.54 using 59 PHA bins.
# Reduced chi-squared = 0.8826 for 55 degrees of freedom
# Null hypothesis probability = 7.181643e-01
Photon flux (15-150 keV) in 1 sec: 0.877518 ( ) 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] : 11.0163 (-2.26076 3.2452)
R^2/D10^2 : 0.286043 (-0.17628 0.395686)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.42 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.595999e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.255e-09 2.665e-09
25- 50 2.055e-08 5.770e-09
50-150 1.411e-08 6.470e-09
15-150 4.192e-08 1.274e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9932 (-45.5737 -101.455)
Norm : 3.92417 (-0.876773 1.14818)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.76 using 59 PHA bins.
# Reduced chi-squared = 0.8554 for 57 degrees of freedom
# Null hypothesis probability = 7.731462e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.026e-08 2.753e-09
25- 50 1.773e-08 4.910e-09
50-150 2.874e-08 1.717e-08
15-150 5.673e-08 2.854e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.62956 (-3.41667 3.34423)
R1^2/D10^2 : 2.22284 (-0.999143 12.5603)
kT2 [keV] : 20.8953 (-11.8772 94.1822)
R2^2/D10^2 : 1.98208E-02 (-0.0084612 0.0762624)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.16 using 59 PHA bins.
# Reduced chi-squared = 0.8939 for 55 degrees of freedom
# Null hypothesis probability = 6.960832e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.013e-08 6.005e-09
25- 50 1.574e-08 8.675e-09
50-150 2.782e-08 1.793e-08
15-150 5.370e-08 2.957e-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: 2.30269 ( -0.160917 0.169224 )
Norm@50keV : 2.68036E-03 ( -0.000300776 0.000296315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.97 using 59 PHA bins.
# Reduced chi-squared = 0.9644 for 57 degrees of freedom
# Null hypothesis probability = 5.516496e-01
Photon flux (15-150 keV) in 22.67 sec: 0.469119 ( -0.0362744 0.0363014 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.80955e-07 ( -5.27105e-08 5.37846e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78998 ( -0.735253 0.427769 )
Epeak [keV] : 15.9742 ( )
Norm@50keV : 5.42347E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.05 using 59 PHA bins.
# Reduced chi-squared = 0.9472 for 56 degrees of freedom
# Null hypothesis probability = 5.874075e-01
Photon flux (15-150 keV) in 22.67 sec: 0.457713 ( -0.038593 0.038678 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.49303e-07 ( -6.10412e-08 6.52261e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78903 ( 1.90785 1.90785 )
beta : -10.0000 ( 10 2.66454e-14 )
Epeak [keV] : 16.0102 ( -7.84267 9.68294 )
Norm@50keV : 5.42960E-03 ( -0.00187309 0.00948772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.05 using 59 PHA bins.
# Reduced chi-squared = 0.9645 for 55 degrees of freedom
# Null hypothesis probability = 5.496441e-01
Photon flux (15-150 keV) in 22.67 sec: 0.460508 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65929e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 2.15e-07
S(50-100 keV) = 1.76e-07
T90 vs. Hardness ratio plot
T90 = 25.2600000202656 sec.
Hardness ratio (energy fluence ratio) = 0.818605
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.954463
Count Ratio (50-100 keV) / (15-25 keV) = 0.379557
Mask shadow pattern
IMX = -3.589301383745268E-01, IMY = 3.012539309384202E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-239.112000 -2.880000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9631 -15.6340 0.3 17.6 -96.5 7.4133 34.5 1.0 Sco X-1
254.5183 35.3052 11.6 50.9 178.0 -0.5469 -1.0 3.7 Her X-1
255.9490 -37.8262 2.0 38.1 -66.5 2.5023 5.7 2.1 4U 1700-377
256.6737 -36.3421 0.0 37.6 -68.9 0.4377 1.0 12.5 GX 349+2
263.2071 -24.6842 37.8 36.8 -90.4 -0.1592 -0.3 11.4 GX 1+4
268.4872 -1.5177 3.1 40.8 -128.2 1.3849 3.7 8.1 SW J1753.5-0127
262.8608 -33.6915 0.0 40.2 -77.0 0.5112 0.8 10.7 GX 354-0
213.9117 -47.2102 2.1 40.0 -14.7 1.4240 5.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.880000 19.788600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0063 -15.6116 10.7 17.7 -96.6 0.0617 1.1 2.3 Sco X-1
254.5327 35.4229 5.0 51.0 177.9 0.3261 2.3 6.1 Her X-1
255.9014 -37.7019 4.5 38.0 -66.6 0.3037 2.6 9.4 4U 1700-377
256.6526 -36.3833 26.5 37.6 -68.9 -0.0485 -0.4 10.8 GX 349+2
262.9140 -24.6943 5.5 36.6 -90.2 0.2600 2.1 6.0 GX 1+4
268.3991 -1.5049 13.8 40.7 -128.2 -0.0851 -0.8 3.6 SW J1753.5-0127
263.2004 -33.7833 8.4 40.5 -77.1 0.2780 1.4 11.0 GX 354-0
251.6525 0.0626 0.6 25.1 -140.0 1.0742 18.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
65.588600 962.963000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9839 -15.6414 0.2 17.0 -8.2 29.0078 54.0 0.3 Sco X-1
254.4851 35.3093 11.5 35.3 153.5 0.9558 1.0 2.4 Her X-1
255.9954 -37.8463 0.8 38.1 -36.2 13.0618 14.0 0.4 4U 1700-377
256.5819 -36.3793 3.9 36.8 -37.2 2.4594 3.0 7.5 GX 349+2
263.0055 -24.7400 1.6 27.2 -53.7 4.7436 7.1 0.4 GX 1+4
264.7511 -44.3829 90.9 46.0 -43.6 0.1883 0.1 4.0 4U 1735-44
268.3463 -1.4647 1.4 16.8 -115.2 4.3931 8.1 1.5 SW J1753.5-0127
270.2412 -25.1340 3.1 31.0 -64.7 3.0264 3.7 4.0 GX 5-1
270.3727 -25.8296 6.0 31.6 -64.1 1.6540 1.9 6.4 GRS 1758-258
273.9968 -14.0010 1.6 26.2 -87.2 5.7080 7.3 2.2 GX 17+2
275.8341 -30.3443 5.1 38.2 -65.5 3.0014 2.3 4.9 H1820-303
285.1095 -25.0184 8.2 41.0 -80.3 3.2809 1.4 7.1 HT1900.1-2455
288.7977 10.9650 1.2 38.5 -138.2 8.5641 9.4 1.2 GRS 1915+105
299.6128 35.1877 1.6 56.8 -164.0 16.5298 7.2 1.4 Cyg X-1
262.8164 -33.8736 4.3 35.5 -46.7 2.0063 2.7 8.9 GX 354-0
214.7964 13.8037 3.0 39.0 81.6 10.5867 3.8 ------ UNKNOWN
241.0534 45.1675 3.7 46.0 139.1 8.6581 3.1 ------ UNKNOWN
235.7804 -8.8932 5.0 18.2 29.4 1.3320 2.3 ------ UNKNOWN
237.0105 -28.3248 3.7 31.7 -5.5 2.0637 3.1 ------ UNKNOWN
258.2240 -16.0223 3.0 17.4 -52.3 1.9827 3.9 ------ UNKNOWN
Plot creation:
Sun May 31 05:03:07 EDT 2015