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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.2088 -28.0905 0.0340 20.7 19.9 0.7676 5.7 TRIG_00505516
------------------------------------------
Foreground time interval of the image:
-29.784 72.901 (delta_t = 102.685 [sec])
Background time interval of the image:
-239.000 -29.784 (delta_t = 209.216 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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)
The mask-weighted light curves based on cleaned DPHs
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Multiple GTIs in the spectrum
tstart tstop
-29.784000 501.980000
503.000000 933.480000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39841 ( -0.359493 0.35678 )
Norm@50keV : 1.42163E-04 ( -3.42493e-05 3.42411e-05 )
------------------------------------------------------------
# Chi-Squared = 95.81 using 59 PHA bins.
# Reduced chi-squared = 1.681 for 57 degrees of freedom
# Null hypothesis probability = 9.865871e-04
Photon flux (15-150 keV) in 962.2 sec: 1.72911E-02 ( -0.00422141 0.00426556 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32405e-06 ( -3.36946e-07 3.45799e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-29.784000 501.980000
503.000000 933.480000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.84498 ( -3.03688 2.5617 )
Epeak [keV] : 47.6627 ( -9.47324 15.9221 )
Norm@50keV : 3.54867E-02 ( -0.0418639 118.419 )
------------------------------------------------------------
# Chi-Squared = 84.61 using 59 PHA bins.
# Reduced chi-squared = 1.511 for 56 degrees of freedom
# Null hypothesis probability = 8.068343e-03
Photon flux (15-150 keV) in 962.2 sec: 1.53483E-02 ( -0.003886 0.0041563 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.37354e-07 ( -2.61538e-07 3.50454e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-29.784000 501.980000
503.000000 933.480000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99975 ( -7714.38 -7699.39 )
beta : -2.72612 ( 2.72562 0.970395 )
Epeak [keV] : 40.1589 ( -8.58969 8.93898 )
Norm@50keV : 1.07994 ( -1.08045 3.55156 )
------------------------------------------------------------
# Chi-Squared = 82.32 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 55 degrees of freedom
# Null hypothesis probability = 9.941048e-03
Photon flux (15-150 keV) in 962.2 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] : 13.2036 (-2.50758 3.44358)
R^2/D10^2 : 3.49277E-03 (-0.0020076 0.0040648)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 85.65 using 59 PHA bins.
# Reduced chi-squared = 1.503 for 57 degrees of freedom
# Null hypothesis probability = 8.379581e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.242e-07 6.021e-08
25- 50 4.350e-07 1.734e-07
50-150 4.838e-07 2.501e-07
15-150 1.043e-06 4.088e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-117.845 -199.993)
Norm : 7.29851E-02 (-0.0172061 0.019516)
------------------------------------------------------------
# Chi-Squared = 94.20 using 59 PHA bins.
# Reduced chi-squared = 1.653 for 57 degrees of freedom
# Null hypothesis probability = 1.412322e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.749e-07 1.005e-07
25- 50 3.364e-07 1.891e-07
50-150 7.378e-07 4.282e-07
15-150 1.249e-06 7.231e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.00000E-04 ( )
R1^2/D10^2 : 3.47526E-07 (-3.47526e-07 -3.47526e-07)
kT2 [keV] : 13.2033 (-2.50729 3.44387)
R2^2/D10^2 : 3.49304E-03 (-0.00200787 0.00406453)
------------------------------------------------------------
# Chi-Squared = 85.77 using 59 PHA bins.
# Chi-Squared = 85.65 using 59 PHA bins.
# Reduced chi-squared = 1.559 for 55 degrees of freedom
# Reduced chi-squared = 1.557 for 55 degrees of freedom
# Null hypothesis probability = 4.980631e-03
# Null hypothesis probability = 5.107929e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.339e-07 8.453e-08
25- 50 4.459e-07 2.611e-07
50-150 4.403e-07 3.051e-07
15-150 1.020e-06 5.999e-07
Peak spectrum fit
Power-law model
Time interval is from -29.804 sec. to -28.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.54326 ( -0.795053 1.20223 )
Norm@50keV : 1.80712E-03 ( -0.00121713 0.00121593 )
------------------------------------------------------------
# Chi-Squared = 46.74 using 59 PHA bins.
# Reduced chi-squared = 0.8200 for 57 degrees of freedom
# Null hypothesis probability = 8.320626e-01
Photon flux (15-150 keV) in 1 sec: 0.364621 ( -0.141277 0.141366 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82892e-08 ( -8.54216e-09 9.69947e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -29.804 sec. to -28.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.672377 ( )
Epeak [keV] : 24.0934 ( )
Norm@50keV : 2.90785E-02 ( )
------------------------------------------------------------
# Chi-Squared = 46.45 using 59 PHA bins.
# Reduced chi-squared = 0.8294 for 56 degrees of freedom
# Null hypothesis probability = 8.148124e-01
Photon flux (15-150 keV) in 1 sec: 0.342957 ( -0.162926 0.151117 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54333e-08 ( -7.44944e-09 1.1866e-08 ) ergs/cm2
Band function
Time interval is from -29.804 sec. to -28.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.59949 ( -1.59171 -1.59171 )
beta : -3.73962 ( 3.73899 1.94015 )
Epeak [keV] : 27.6119 ( -27.6009 16.3254 )
Norm@50keV : 1.01493 ( -0.968807 120.948 )
------------------------------------------------------------
# Chi-Squared = 46.39 using 59 PHA bins.
# Reduced chi-squared = 0.8435 for 55 degrees of freedom
# Null hypothesis probability = 7.890599e-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] : 7.31317 (-2.26147 3.32483)
R^2/D10^2 : 0.589484 (-0.589484 2.19966)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.42 using 59 PHA bins.
# Reduced chi-squared = 0.8144 for 57 degrees of freedom
# Null hypothesis probability = 8.405071e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.288e-09 3.430e-09
25- 50 7.872e-09 4.937e-09
50-150 1.524e-09 1.299e-09
15-150 1.468e-08 9.390e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.9389 (-17.4461 71.2729)
Norm : 2.94325 (-1.68377 4.83119)
------------------------------------------------------------
# Chi-Squared = 46.50 using 59 PHA bins.
# Reduced chi-squared = 0.8157 for 57 degrees of freedom
# Null hypothesis probability = 8.384543e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.984e-09 3.807e-09
25- 50 6.830e-09 4.476e-09
50-150 3.730e-09 3.362e-09
15-150 1.654e-08 1.100e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.884511 (-1.09282 1.2796)
R1^2/D10^2 : 3.11315E+06 ( )
kT2 [keV] : 8.22715 (-2.56845 4.47881)
R2^2/D10^2 : 0.327804 (-0.274347 0.473235)
------------------------------------------------------------
# Chi-Squared = 42.97 using 59 PHA bins.
# Chi-Squared = 42.79 using 59 PHA bins.
# Reduced chi-squared = 0.7813 for 55 degrees of freedom
# Reduced chi-squared = 0.7780 for 55 degrees of freedom
# Null hypothesis probability = 8.806146e-01
# Null hypothesis probability = 8.846277e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.297e-09 2.661e-09
25- 50 7.438e-09 4.749e-09
50-150 2.239e-09 1.695e-09
15-150 1.498e-08 9.025e-09
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: 1.88314 ( -0.396205 0.420202 )
Norm@50keV : 4.02337E-04 ( -0.000113983 0.000111659 )
------------------------------------------------------------
# Chi-Squared = 61.98 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.031741e-01
Photon flux (15-150 keV) in 102.7 sec: 5.73316E-02 ( -0.0136864 0.0136981 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79802e-07 ( -1.03523e-07 1.08745e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.65234 ( -3.57189 2.79669 )
Epeak [keV] : 35.9487 ( -6.88309 14.3718 )
Norm@50keV : 7.24601E-02 ( -0.0858656 1562.05 )
------------------------------------------------------------
# Chi-Squared = 56.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.398984e-01
Photon flux (15-150 keV) in 102.7 sec: 5.22667E-02 ( -0.0129549 0.0134114 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72763e-07 ( -7.50326e-08 1.05634e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99993 ( -25631.3 -25616.3 )
beta : -2.81808 ( -2.30101 0.809961 )
Epeak [keV] : 29.7187 ( -5.5717 6.13207 )
Norm@50keV : 24.1857 ( -24.8398 68.0024 )
------------------------------------------------------------
# Chi-Squared = 54.41 using 59 PHA bins.
# Reduced chi-squared = 0.9893 for 55 degrees of freedom
# Null hypothesis probability = 4.970734e-01
Photon flux (15-150 keV) in 102.7 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) = 3.10057e-07
S(50-100 keV) = 4.72272e-07
T90 vs. Hardness ratio plot
T90 = 890.432000041008 sec.
Hardness ratio (energy fluence ratio) = 1.52318
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 6.56363
Count Ratio (50-100 keV) / (15-25 keV) = 3.32928
Mask shadow pattern
IMX = 3.543051582569957E-01, IMY = -1.285547450117715E-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:
-239.000000 -29.784000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4615 -60.7202 12.1 47.4 -154.4 -0.4330 -1.0 7.2 Cen X-3
186.6565 -62.7701 42.4 39.5 -154.7 0.0879 0.3 0.0 GX 301-2
244.9832 -15.6415 0.3 30.7 -28.4 9.1785 42.2 0.2 Sco X-1
256.0889 -37.8251 7.7 8.6 7.7 0.2818 1.5 5.0 4U 1700-377
256.3423 -36.3997 3.8 10.0 6.0 0.5686 3.0 4.7 GX 349+2
263.1789 -24.6410 42.0 23.1 11.7 -0.0552 -0.3 11.2 GX 1+4
264.6535 -44.5919 72.3 9.1 71.4 0.0291 0.2 9.3 4U 1735-44
268.4219 -1.4665 6.8 46.7 7.6 0.7181 1.7 3.3 SW J1753.5-0127
270.3759 -24.9408 6.4 25.7 26.3 0.3837 1.8 9.7 GX 5-1
270.1423 -25.8743 0.0 24.7 27.0 -0.3890 -1.9 11.7 GRS 1758-258
274.1086 -14.0034 5.6 37.0 22.3 0.6399 2.0 6.3 GX 17+2
275.9451 -30.3850 3.3 24.3 43.5 0.8566 3.5 1.5 H1820-303
285.0303 -24.9673 29.0 33.8 47.8 0.1392 0.4 2.8 HT1900.1-2455
263.1404 -33.7035 6.8 14.9 24.0 0.3367 1.7 10.9 GX 354-0
306.9652 -40.3231 3.3 39.9 87.0 3.0349 3.5 ------ UNKNOWN
277.1758 -33.5118 3.0 22.9 51.0 0.9676 3.8 ------ UNKNOWN
272.7057 -28.7706 2.3 23.7 35.7 1.1248 4.9 ------ UNKNOWN
218.8746 -88.3723 2.7 42.8 165.8 1.6744 4.3 ------ UNKNOWN
107.9587 -79.1694 2.7 53.2 172.5 3.3056 4.2 ------ UNKNOWN
165.7779 -70.2648 3.1 46.3 -167.7 1.3502 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-29.784000 72.900590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5455 -60.6889 246.1 47.4 -154.4 -0.0125 -0.0 7.8 Cen X-3
186.6605 -62.9052 5.5 39.5 -155.0 0.3851 2.1 8.1 GX 301-2
244.8085 -15.6849 11.3 30.7 -28.8 0.1481 1.0 10.2 Sco X-1
255.7614 -37.9574 0.0 8.4 6.4 -0.2511 -1.9 12.6 4U 1700-377
256.6077 -36.4809 8.3 10.0 7.3 -0.1815 -1.4 9.0 GX 349+2
263.0672 -24.6809 5.6 23.0 11.5 0.2958 2.1 5.0 GX 1+4
264.9299 -44.6143 0.0 9.3 71.8 -0.2552 -2.0 12.7 4U 1735-44
268.3662 -1.4741 95.7 46.7 7.6 0.0351 0.1 1.3 SW J1753.5-0127
270.2749 -24.9969 9.2 25.6 26.2 -0.1833 -1.3 5.0 GX 5-1
270.4202 -25.6073 15.4 25.1 27.2 -0.1077 -0.7 10.3 GRS 1758-258
274.1349 -14.0654 8.2 36.9 22.4 0.2995 1.4 7.7 GX 17+2
276.0090 -30.4396 7.5 24.3 43.7 -0.2446 -1.5 6.2 H1820-303
285.0143 -24.7835 7.9 33.9 47.6 -0.3383 -1.5 8.3 HT1900.1-2455
262.9893 -33.7470 3.9 14.8 23.7 -0.3913 -3.0 5.3 GX 354-0
5.4816 -76.0416 2.4 51.1 148.0 3.1905 4.8 ------ UNKNOWN
265.2087 -28.0905 2.0 20.7 19.9 0.7677 5.7 ------ UNKNOWN
176.6592 -68.2427 2.4 42.9 -163.8 0.9210 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
114.900640 501.980000
503.000000 912.300600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9774 -15.6434 0.2 22.5 -64.6 37.9353 52.7 0.2 Sco X-1
256.1947 -37.7392 5.1 12.3 -148.3 1.4102 2.2 11.7 4U 1700-377
256.6136 -36.4103 4.9 11.0 -145.1 1.4903 2.3 8.6 GX 349+2
262.8323 -24.8586 3.8 3.9 -37.9 1.8376 3.0 11.8 GX 1+4
264.5489 -44.3753 8.6 16.3 177.7 0.7542 1.3 9.4 4U 1735-44
268.4359 -1.4229 3.5 26.8 3.2 1.8776 3.2 4.4 SW J1753.5-0127
270.4156 -25.2325 5.1 5.5 55.7 1.2870 2.3 11.6 GX 5-1
270.2339 -25.7685 3.4 5.0 59.9 2.1964 3.9 4.0 GRS 1758-258
273.9523 -14.0550 2.0 16.2 27.9 3.0504 5.7 3.3 GX 17+2
275.7487 -30.2456 3.9 9.5 101.8 1.6633 2.9 11.7 H1820-303
285.1292 -24.8080 4.3 18.1 80.2 1.6512 2.7 8.4 HT1900.1-2455
288.8192 11.0845 6.8 45.3 29.6 2.5379 1.7 8.4 GRS 1915+105
262.9866 -33.8012 3.9 6.0 -166.1 1.6628 3.0 2.0 GX 354-0
308.7036 -21.5037 3.4 39.8 86.5 9.4143 3.4 ------ UNKNOWN
281.8495 -9.4053 2.3 24.4 39.2 3.2868 5.0 ------ UNKNOWN
231.4923 -68.0995 2.8 44.7 -166.9 4.2637 4.0 ------ UNKNOWN
253.3652 -1.9256 2.6 28.5 -29.4 2.7289 4.4 ------ UNKNOWN
189.5409 -68.3011 4.2 58.8 -159.2 13.0003 2.8 ------ UNKNOWN
235.1146 7.3449 3.7 45.8 -47.9 6.4491 3.2 ------ UNKNOWN
200.0165 -53.9033 3.4 53.2 -142.1 12.3990 3.4 ------ UNKNOWN
228.2853 -2.0642 4.3 43.8 -64.1 7.7130 2.7 ------ UNKNOWN
Plot creation:
Sat Oct 15 15:08:48 EDT 2011