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Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.7095 -8.7699 0.0313 36.1 -32.2 0.0157 6.2 TRIG_00501752
------------------------------------------
Foreground time interval of the image:
0.000 0.012 (delta_t = 0.012 [sec])
Background time interval of the image:
-239.568 0.000 (delta_t = 239.568 [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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.016000
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 0.016000
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 0.016000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Flight mask-tagged light curves
Caution: Mask-weight map is always using the same on-axis map
Quad-rate summed light curves (from T0-300 to T0+1000)
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 0.000 sec. to 0.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.13963 ( -0.481445 0.764114 )
Norm@50keV : 1.82565E-02 ( -0.0110047 0.0113523 )
------------------------------------------------------------
# Chi-Squared = 58.80 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.094682e-01
Photon flux (15-150 keV) in 0.012 sec: 5.56938 ( -2.39125 2.3872 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82134e-09 ( -1.21277e-09 1.3014e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.96794 ( 4.02666 3.08821 )
Epeak [keV] : 39.7283 ( -7.65284 7.97886 )
Norm@50keV : 184.574 ( -219.921 419638 )
------------------------------------------------------------
# Chi-Squared = 41.67 using 59 PHA bins.
# Reduced chi-squared = 0.7441 for 56 degrees of freedom
# Null hypothesis probability = 9.230640e-01
Photon flux (15-150 keV) in 0.012 sec: 8.53828 ( -2.91363 2.84762 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84126e-09 ( -1.74704e-09 1.77526e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.53704 ( -4.82004 -6.0442 )
beta : -9.98839 ( 279.059 289.058 )
Epeak [keV] : 40.3327 ( -6.50082 5.60352 )
Norm@50keV : 350.574 ( -350.069 143.069 )
------------------------------------------------------------
# Chi-Squared = 41.74 using 59 PHA bins.
# Reduced chi-squared = 0.7590 for 55 degrees of freedom
# Null hypothesis probability = 9.061971e-01
Photon flux (15-150 keV) in 0.012 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] : 9.18729 (-1.68479 1.39554)
R^2/D10^2 : 6.86768 (-3.41282 7.48985)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 42.92 using 59 PHA bins.
# Reduced chi-squared = 0.7531 for 57 degrees of freedom
# Null hypothesis probability = 9.164854e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.368e-09 6.858e-10
25- 50 3.003e-09 1.406e-09
50-150 1.220e-09 8.556e-10
15-150 5.590e-09 2.575e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.0600 (-8.43643 9.57321)
Norm : 74.3275 (-31.0284 44.0671)
------------------------------------------------------------
# Chi-Squared = 51.25 using 59 PHA bins.
# Reduced chi-squared = 0.8990 for 57 degrees of freedom
# Null hypothesis probability = 6.897806e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.636e-09 7.271e-10
25- 50 1.680e-09 9.091e-10
50-150 7.167e-10 5.957e-10
15-150 4.032e-09 2.059e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.226118 (-0.226118 -0.226118)
R1^2/D10^2 : 0.792745 (-0.792745 -0.792745)
kT2 [keV] : 9.22348 (-1.65886 1.42052)
R2^2/D10^2 : 6.77235 (-3.35953 7.54109)
------------------------------------------------------------
# Chi-Squared = 42.92 using 59 PHA bins.
# Reduced chi-squared = 0.7804 for 55 degrees of freedom
# Null hypothesis probability = 8.817246e-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
Peak spectrum fit
Power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87291 ( -0.890065 1.1367 )
Norm@50keV : 2.43842E-03 ( -0.0024387 0.00145235 )
------------------------------------------------------------
# Chi-Squared = 67.75 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.560248e-01
Photon flux (15-150 keV) in 1 sec: 0.345979 ( -0.180872 0.181396 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24189e-08 ( -1.29952e-08 1.41038e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( )
Epeak [keV] : 46.0588 ( -8.7624 10.9695 )
Norm@50keV : 2327.16 ( -2327.17 21956.4 )
------------------------------------------------------------
# Chi-Squared = 66.91 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 56 degrees of freedom
# Null hypothesis probability = 1.509094e-01
Photon flux (15-150 keV) in 1 sec: 0.324071 ( -0.324071 0.188365 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98789e-08 ( -1.22924e-08 1.47437e-08 ) ergs/cm2
Band function
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.318670 ( 0.0750399 0.0750399 )
beta : -10.00000 ( 1.40644e+07 1.40644e+07 )
Epeak [keV] : 46.9602 ( -43.5181 -47.0206 )
Norm@50keV : 3.81777E-02 ( -0.045476 10.4833 )
------------------------------------------------------------
# Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 55 degrees of freedom
# Null hypothesis probability = 1.274481e-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] : 11.8855 (-4.71125 8.14308)
R^2/D10^2 : 9.37807E-02 (-0.0937807 0.487794)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.699788e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.800e-09 1.879e-09
25- 50 8.712e-09 5.880e-09
50-150 7.352e-09 6.395e-09
15-150 1.886e-08 1.246e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.5873 (-79.5791 -79.5791)
Norm : 1.66543 (-0.94986 2.12536)
------------------------------------------------------------
# Chi-Squared = 67.38 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.634029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.320e-09 2.835e-09
25- 50 7.103e-09 4.806e-09
50-150 9.991e-09 9.270e-09
15-150 2.141e-08 1.593e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.04920 (-3.08586 16.6054)
R1^2/D10^2 : 8.93609 (-8.43959 -8.43959)
kT2 [keV] : 13.1705 (-13.1466 -13.1466)
R2^2/D10^2 : 5.82379E-02 (-0.0586789 0.419403)
------------------------------------------------------------
# Chi-Squared = 66.62 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.353924e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.989e-09 1.875e-09
25- 50 7.766e-09 4.961e-09
50-150 8.267e-09 6.550e-09
15-150 2.002e-08 1.397e-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: 3.13963 ( -0.481445 0.764114 )
Norm@50keV : 1.82565E-02 ( -0.0110047 0.0113523 )
------------------------------------------------------------
# Chi-Squared = 58.80 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.094682e-01
Photon flux (15-150 keV) in 0.012 sec: 5.56938 ( -2.39125 2.3872 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82134e-09 ( -1.21277e-09 1.3014e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.96794 ( 4.02666 3.08821 )
Epeak [keV] : 39.7283 ( -7.65284 7.97886 )
Norm@50keV : 184.574 ( -219.921 419638 )
------------------------------------------------------------
# Chi-Squared = 41.67 using 59 PHA bins.
# Reduced chi-squared = 0.7441 for 56 degrees of freedom
# Null hypothesis probability = 9.230640e-01
Photon flux (15-150 keV) in 0.012 sec: 8.53828 ( -2.91363 2.84762 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84126e-09 ( -1.74704e-09 1.77526e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.59110 ( -16.4198 -6.59918 )
beta : -9.98817 ( 274.109 284.109 )
Epeak [keV] : 40.3523 ( -6.47125 5.64706 )
Norm@50keV : 374.280 ( -373.704 155.48 )
------------------------------------------------------------
# Chi-Squared = 41.75 using 59 PHA bins.
# Reduced chi-squared = 0.7591 for 55 degrees of freedom
# Null hypothesis probability = 9.060919e-01
Photon flux (15-150 keV) in 0.012 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) = 9.2025e-10
S(50-100 keV) = 4.16042e-10
T90 vs. Hardness ratio plot
T90 = 0.0119999051094055 sec.
Hardness ratio (energy fluence ratio) = 0.452097
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.961262
Count Ratio (50-100 keV) / (15-25 keV) = 0.551267
Mask shadow pattern
IMX = 6.172961633388324E-01, IMY = 3.894394472084158E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.016000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.016000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.016000
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:
-239.568000 0.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
263.1166 -24.8342 5.6 40.3 -67.3 -1.1155 -2.0 7.9 GX 1+4
264.7032 -44.4842 5.6 36.2 -98.7 0.9632 2.1 2.7 4U 1735-44
268.2513 -1.6105 406.8 48.6 -35.2 -0.0139 -0.0 11.8 SW J1753.5-0127
270.1685 -25.1081 3.4 34.3 -64.0 1.0275 3.4 6.5 GX 5-1
270.3281 -25.8704 9.4 33.9 -65.2 0.3650 1.2 7.8 GRS 1758-258
273.9518 -14.0533 7.3 36.3 -44.2 0.4266 1.6 3.3 GX 17+2
276.0628 -30.4837 5.5 27.7 -71.3 0.5015 2.1 10.0 H1820-303
285.2041 -24.9383 11.7 21.7 -52.7 0.1905 1.0 9.2 HT1900.1-2455
288.7730 10.9713 2.0 46.9 -2.7 2.0300 5.7 2.1 GRS 1915+105
316.0191 16.3135 2.9 48.8 33.9 3.4688 4.0 ------ UNKNOWN
19.2310 -58.6090 2.9 53.2 166.5 3.4929 4.0 ------ UNKNOWN
29.7811 -73.0363 2.4 57.0 -175.7 4.6874 4.8 ------ UNKNOWN
258.5202 -38.2148 3.5 40.9 -88.8 2.7764 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.000000 0.012000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
262.8524 -24.6913 3.6 40.6 -67.3 0.0196 3.2 9.1 GX 1+4
264.9459 -44.5856 5.1 36.0 -98.9 -0.0104 -2.3 11.9 4U 1735-44
268.4280 -1.5744 5.4 48.5 -35.0 0.0109 2.1 8.1 SW J1753.5-0127
270.4373 -24.9613 144.4 34.1 -63.6 0.0003 0.1 10.9 GX 5-1
270.2160 -25.8046 5.0 34.0 -65.2 0.0079 2.3 6.0 GRS 1758-258
274.1382 -13.9330 9.9 36.2 -43.8 -0.0036 -1.2 9.9 GX 17+2
275.9947 -30.4787 17.0 27.8 -71.3 0.0018 0.7 7.6 H1820-303
285.2225 -25.0233 0.0 21.6 -52.8 0.0024 1.1 11.9 HT1900.1-2455
288.8941 10.9875 6.1 46.9 -2.6 -0.0063 -1.9 6.2 GRS 1915+105
294.1315 -23.6247 3.7 15.2 -36.1 0.0055 3.2 ------ UNKNOWN
306.5371 -54.9472 2.3 23.0 -152.6 0.0086 4.9 ------ UNKNOWN
278.7083 -8.7741 1.8 36.1 -32.3 0.0162 6.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
304.532600 962.442000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
351.9850 -47.2655 2.3 44.2 41.1 5.0412 4.9 ------ UNKNOWN
336.6340 28.8462 2.4 51.9 155.1 8.1916 4.9 ------ UNKNOWN
5.9995 8.2841 3.2 18.3 169.2 1.1015 3.6 ------ UNKNOWN
45.7262 -54.6397 3.1 53.0 -3.0 3.2541 3.8 ------ UNKNOWN
53.0365 7.6525 3.5 40.9 -92.4 6.3944 3.3 ------ UNKNOWN
Plot creation:
Wed Aug 31 16:20:13 EDT 2011