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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.9177 +27.2305 0.0665 36.3 173.4 1.5169 2.9 TRIG_00420256
------------------------------------------
Foreground time interval of the image:
-2.984 56.864 (delta_t = 59.848 [sec])
Background time interval of the image:
-5.499 -2.984 (delta_t = 2.515 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 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 64.000000
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 64.000000
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 64.000000
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
Time interval is from -2.984 sec. to 56.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.92078 ( -0.598545 0.769431 )
Norm@50keV : 3.43720E-04 ( -0.00034372 0.000207829 )
------------------------------------------------------------
# Chi-Squared = 53.62 using 59 PHA bins.
# Reduced chi-squared = 0.9406 for 57 degrees of freedom
# Null hypothesis probability = 6.028055e-01
Photon flux (15-150 keV) in 59.85 sec: 8.92879E-02 ( -0.0243142 0.0244077 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38597e-07 ( -7.93713e-08 8.97989e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.984 sec. to 56.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.341675 ( )
Epeak [keV] : 20.5087 ( )
Norm@50keV : 7.27628E-02 ( )
------------------------------------------------------------
# Chi-Squared = 50.98 using 59 PHA bins.
# Reduced chi-squared = 0.9104 for 56 degrees of freedom
# Null hypothesis probability = 6.647898e-01
Photon flux (15-150 keV) in 59.85 sec: 8.75256E-02 ( -0.0231031 0.0232804 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06727e-07 ( -5.8592e-08 6.59517e-08 ) ergs/cm2
Band function
Time interval is from -2.984 sec. to 56.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.671861 ( 1.5368 6.02246 )
beta : -8.42723 ( 5.28665 14.6575 )
Epeak [keV] : 21.4970 ( -9.50882 89.8874 )
Norm@50keV : 0.120148 ( -0.12015 140.682 )
------------------------------------------------------------
# Chi-Squared = 50.93 using 59 PHA bins.
# Reduced chi-squared = 0.9259 for 55 degrees of freedom
# Null hypothesis probability = 6.309986e-01
Photon flux (15-150 keV) in 59.85 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] : 5.85164 (-1.34015 1.57409)
R^2/D10^2 : 0.386436 (-0.252739 0.859187)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 50.88 using 59 PHA bins.
# Reduced chi-squared = 0.8927 for 57 degrees of freedom
# Null hypothesis probability = 7.024899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.014e-07 5.856e-08
25- 50 9.572e-08 6.087e-08
50-150 7.902e-09 6.898e-09
15-150 2.050e-07 1.232e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5009 (-7.38333 14.1393)
Norm : 1.21358 (-0.581863 1.22708)
------------------------------------------------------------
# Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9094 for 57 degrees of freedom
# Null hypothesis probability = 6.685664e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.051e-07 5.704e-08
25- 50 8.652e-08 5.063e-08
50-150 2.266e-08 1.940e-08
15-150 2.143e-07 1.127e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.28188E-04 ( )
R1^2/D10^2 : 0.880772 (-0.880772 -0.880772)
kT2 [keV] : 5.85163 (-1.34015 1.57408)
R2^2/D10^2 : 0.386438 (-0.252737 0.859192)
------------------------------------------------------------
# Chi-Squared = 50.96 using 59 PHA bins.
# Chi-Squared = 50.88 using 59 PHA bins.
# Reduced chi-squared = 0.9265 for 55 degrees of freedom
# Reduced chi-squared = 0.9252 for 55 degrees of freedom
# Null hypothesis probability = 6.297155e-01
# Null hypothesis probability = 6.325501e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.028e-07 4.216e-06
25- 50 9.387e-08 1.385e-05
50-150 1.071e-08 7.661e-05
15-150 2.074e-07 1.389e-04
Peak spectrum fit
Power-law model
Time interval is from 27.344 sec. to 28.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17946 ( -0.691419 0.891751 )
Norm@50keV : 2.63990E-03 ( -0.00263836 0.00149476 )
------------------------------------------------------------
# Chi-Squared = 55.39 using 59 PHA bins.
# Reduced chi-squared = 0.9717 for 57 degrees of freedom
# Null hypothesis probability = 5.358250e-01
Photon flux (15-150 keV) in 1 sec: 0.432164 ( -0.186256 0.186259 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47338e-08 ( -1.19992e-08 1.32779e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.344 sec. to 28.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.52703 ( 1.58498 3.60183 )
Epeak [keV] : 36.8802 ( -36.8967 21.7199 )
Norm@50keV : 0.437360 ( -0.538475 38.6066 )
------------------------------------------------------------
# Chi-Squared = 52.52 using 59 PHA bins.
# Reduced chi-squared = 0.9379 for 56 degrees of freedom
# Null hypothesis probability = 6.073300e-01
Photon flux (15-150 keV) in 1 sec: 0.408563 ( -0.166821 0.183263 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14179e-08 ( -8.9826e-09 1.12437e-08 ) ergs/cm2
Band function
Time interval is from 27.344 sec. to 28.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.06652 ( -4.11061 -2.09287 )
beta : -9.99971 ( 10823.6 10833.6 )
Epeak [keV] : 36.7237 ( -31.3396 21.6632 )
Norm@50keV : 0.933889 ( -0.933891 29.9121 )
------------------------------------------------------------
# Chi-Squared = 52.50 using 59 PHA bins.
# Reduced chi-squared = 0.9546 for 55 degrees of freedom
# Null hypothesis probability = 5.705644e-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] : 9.49004 (-2.94918 4.0527)
R^2/D10^2 : 0.277561 (-0.277561 0.886788)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.49 using 59 PHA bins.
# Reduced chi-squared = 0.9209 for 57 degrees of freedom
# Null hypothesis probability = 6.446857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.990e-09 3.228e-09
25- 50 1.150e-08 7.345e-09
50-150 5.148e-09 4.190e-09
15-150 2.164e-08 1.386e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.4057 (-25.6892 120.299)
Norm : 2.74047 (-1.42228 2.85222)
------------------------------------------------------------
# Chi-Squared = 54.04 using 59 PHA bins.
# Reduced chi-squared = 0.9481 for 57 degrees of freedom
# Null hypothesis probability = 5.867219e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.500e-09 4.159e-09
25- 50 8.929e-09 6.060e-09
50-150 7.715e-09 6.120e-09
15-150 2.314e-08 1.572e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.168724 (-0.168724 -0.168724)
R1^2/D10^2 : 1.26944 (-1.26944 -1.26944)
kT2 [keV] : 9.48973 (-2.94887 4.05301)
R2^2/D10^2 : 0.277595 (-0.212486 0.886643)
------------------------------------------------------------
# Chi-Squared = 52.49 using 59 PHA bins.
# Reduced chi-squared = 0.9544 for 55 degrees of freedom
# Null hypothesis probability = 5.710454e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 2.92078 ( -0.598545 0.769431 )
Norm@50keV : 3.43720E-04 ( -0.00034372 0.000207829 )
------------------------------------------------------------
# Chi-Squared = 53.62 using 59 PHA bins.
# Reduced chi-squared = 0.9406 for 57 degrees of freedom
# Null hypothesis probability = 6.028055e-01
Photon flux (15-150 keV) in 59.85 sec: 8.92879E-02 ( -0.0243142 0.0244077 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38597e-07 ( -7.93713e-08 8.97989e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.341675 ( )
Epeak [keV] : 20.5087 ( )
Norm@50keV : 7.27628E-02 ( )
------------------------------------------------------------
# Chi-Squared = 50.98 using 59 PHA bins.
# Reduced chi-squared = 0.9104 for 56 degrees of freedom
# Null hypothesis probability = 6.647898e-01
Photon flux (15-150 keV) in 59.85 sec: 8.75256E-02 ( -0.0231031 0.0232804 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06727e-07 ( -5.8592e-08 6.59517e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.671861 ( 1.5368 6.04462 )
beta : -8.42723 ( 5.28665 14.6575 )
Epeak [keV] : 21.4970 ( -9.50882 89.8874 )
Norm@50keV : 0.120148 ( -0.12015 140.682 )
------------------------------------------------------------
# Chi-Squared = 50.93 using 59 PHA bins.
# Reduced chi-squared = 0.9259 for 55 degrees of freedom
# Null hypothesis probability = 6.309986e-01
Photon flux (15-150 keV) in 59.85 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) = 7.99195e-08
S(50-100 keV) = 4.22184e-08
T90 vs. Hardness ratio plot
T90 = 50.2479999065399 sec.
Hardness ratio (energy fluence ratio) = 0.528262
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.703915
Count Ratio (50-100 keV) / (15-25 keV) = -0.0199516
Mask shadow pattern
IMX = -7.304218281600970E-01, IMY = -8.444689804430922E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-5.499400 -2.984000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0484 -15.6786 5.6 33.3 77.6 0.0760 2.0 4.6 Sco X-1
254.5883 35.2698 6.3 49.1 157.5 -0.0953 -1.8 7.7 Her X-1
256.0072 -37.9351 2.2 35.7 34.2 0.1582 5.2 5.5 4U 1700-377
256.5912 -36.4816 5.2 34.3 35.3 -0.0631 -2.2 8.3 GX 349+2
263.1707 -24.8918 17.2 21.9 42.9 -0.0129 -0.7 12.4 GX 1+4
264.8965 -44.4940 7.1 37.9 19.0 -0.0427 -1.6 7.1 4U 1735-44
268.2147 -1.3128 0.0 12.4 128.1 0.0115 0.7 12.4 SW J1753.5-0127
270.1189 -24.9301 0.0 18.3 27.8 0.0110 0.7 12.7 GX 5-1
270.4562 -25.6116 4.7 18.7 26.0 0.0410 2.4 11.5 GRS 1758-258
274.1024 -14.1823 4.0 7.1 39.0 0.0442 2.9 10.4 GX 17+2
275.7540 -30.2219 0.0 21.9 9.4 0.0171 1.0 12.4 H1820-303
285.1827 -24.7807 5.0 17.6 -17.6 0.0379 2.3 11.6 HT1900.1-2455
288.7011 10.8451 2.5 21.9 -148.4 0.0775 4.6 8.3 GRS 1915+105
299.5726 35.2039 3.9 48.0 -153.2 0.1106 2.9 0.9 Cyg X-1
307.9711 40.9494 176.5 56.4 -150.0 -0.0064 -0.1 6.3 Cyg X-3
319.3591 -30.6121 2.0 44.2 -50.8 0.2490 5.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.984000 56.864000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8423 -15.6726 6.8 33.6 77.7 1.4834 1.7 8.2 Sco X-1
254.3237 35.1732 86.5 49.3 157.1 -0.1706 -0.1 12.1 Her X-1
256.0019 -37.9910 2.9 35.7 34.2 -2.8583 -4.0 8.8 4U 1700-377
256.6006 -36.5087 4.7 34.3 35.3 1.6226 2.4 9.5 GX 349+2
263.1019 -24.7749 11.6 21.9 43.4 0.4512 1.0 5.4 GX 1+4
264.9164 -44.5130 3.6 37.8 19.0 1.9801 3.2 8.3 4U 1735-44
268.4328 -1.3012 6.9 12.3 128.7 -0.6422 -1.7 9.9 SW J1753.5-0127
270.3010 -25.0175 27.2 18.2 27.5 0.1662 0.4 3.8 GX 5-1
270.1428 -25.7382 8.8 18.9 26.9 0.5194 1.3 8.6 GRS 1758-258
273.9960 -14.0248 7.9 7.0 41.3 0.5243 1.5 0.9 GX 17+2
275.8720 -30.5181 180.6 22.1 9.1 0.0264 0.1 9.5 H1820-303
285.1928 -24.8968 11.1 17.6 -17.5 -0.3970 -1.0 8.7 HT1900.1-2455
288.8502 10.7994 2.8 21.9 -148.4 -1.6624 -4.1 9.3 GRS 1915+105
299.4735 35.2099 3.4 48.0 -153.6 2.9915 3.4 5.7 Cyg X-1
307.9886 41.0468 8.7 56.5 -150.3 -3.2534 -1.3 7.9 Cyg X-3
300.4514 -53.4250 2.0 48.3 -14.2 4.5745 5.8 ------ UNKNOWN
290.5683 48.1637 2.2 57.7 -167.2 11.2829 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
133.500600 470.100610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3417 35.4571 8.1 17.1 149.0 -0.7950 -1.4 8.9 Her X-1
268.2543 -1.3437 11.7 28.7 33.2 0.6913 1.0 9.4 SW J1753.5-0127
274.1014 -14.0760 6.9 41.3 22.3 1.7058 1.7 6.0 GX 17+2
285.0133 -24.9479 7.0 53.6 10.8 2.3783 1.6 2.1 HT1900.1-2455
288.7318 10.9363 2.9 22.7 -22.0 2.2434 3.9 4.0 GRS 1915+105
299.6020 35.2003 0.7 25.0 -90.0 12.3885 17.5 0.6 Cyg X-1
308.0970 40.9467 3.8 32.7 -98.7 3.0902 3.1 0.7 Cyg X-3
212.6863 79.0748 2.3 57.7 -165.5 10.4314 5.1 ------ UNKNOWN
Plot creation:
Sat Apr 24 08:16:07 EDT 2010