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Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
307.4205 -52.7192 0.0184 33.8014 -40.0427 0.4249547 10.417 TRIG_00508712
Foreground time interval of the image:
-6.292 2.692 (delta_t = 8.984 [sec])
Background time interval of the image:
-400.551 -382.303 (delta_t = 18.248 [sec])
-239.952 -6.292 (delta_t = 233.660 [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 2.048000
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 2.048000
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 2.048000
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 -6.292 sec. to 2.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52721 ( -0.346219 0.399758 )
Norm@50keV : 2.01380E-03 ( -0.000579231 0.000577113 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.71 using 59 PHA bins.
# Reduced chi-squared = 0.6616 for 57 degrees of freedom
# Null hypothesis probability = 9.771899e-01
Photon flux (15-150 keV) in 8.984 sec: 0.402287 ( -0.0644778 0.0644975 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82268e-07 ( -3.72444e-08 3.94931e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.292 sec. to 2.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98046 ( -2.07696 0.016119 )
Epeak [keV] : 1.22064 ( -0.578687 26.1798 )
Norm@50keV : 4.56870E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.79 using 59 PHA bins.
# Reduced chi-squared = 0.6749 for 56 degrees of freedom
# Null hypothesis probability = 9.704716e-01
Photon flux (15-150 keV) in 8.984 sec: 0.399900 ( -0.065884 0.065965 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77667e-07 ( -4.59586e-08 4.3311e-08 ) ergs/cm2
Band function
Time interval is from -6.292 sec. to 2.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.53593 ( 4.53593 4.53593 )
beta : -2.52722 ( -0.399692 0.346138 )
Epeak [keV] : 4.81946 ( -4.81946 -4.81946 )
Norm@50keV : 0.273702 ( -0.0787239 0.0784395 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.71 using 59 PHA bins.
# Reduced chi-squared = 0.6857 for 55 degrees of freedom
# Null hypothesis probability = 9.637892e-01
Photon flux (15-150 keV) in 8.984 sec: 0.398760 ( 6.60124 -0.063611 ) 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] : 6.30831 (-1.04244 1.24972)
R^2/D10^2 : 1.16219 (-0.625169 1.38765)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.53 using 59 PHA bins.
# Reduced chi-squared = 0.7462 for 57 degrees of freedom
# Null hypothesis probability = 9.231004e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.912e-08 1.607e-08
25- 50 6.563e-08 2.126e-08
50-150 7.349e-09 4.691e-09
15-150 1.321e-07 3.846e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.3357 (-9.71008 17.1303)
Norm : 3.37397 (-1.09599 1.8561)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.47 using 59 PHA bins.
# Reduced chi-squared = 0.6749 for 57 degrees of freedom
# Null hypothesis probability = 9.716430e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.985e-08 1.498e-08
25- 50 6.621e-08 1.786e-08
50-150 3.360e-08 1.853e-08
15-150 1.597e-07 4.115e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.32291 (-1.33818 1.31579)
R1^2/D10^2 : 2.14420 (-1.28612 1.54061)
kT2 [keV] : 24.0893 (-10.5141 90.6041)
R2^2/D10^2 : 2.82358E-03 (-0.00280557 0.0558649)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.13 using 59 PHA bins.
# Reduced chi-squared = 0.6570 for 55 degrees of freedom
# Null hypothesis probability = 9.768864e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.240e-08 3.463e-08
25- 50 5.993e-08 2.869e-08
50-150 6.518e-08 4.459e-08
15-150 1.875e-07 9.588e-08
Peak spectrum fit
Power-law model
Time interval is from 0.412 sec. to 1.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32264 ( -0.432614 0.523375 )
Norm@50keV : 5.21793E-03 ( -0.00180037 0.00171411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.36 using 59 PHA bins.
# Reduced chi-squared = 0.9888 for 57 degrees of freedom
# Null hypothesis probability = 4.990420e-01
Photon flux (15-150 keV) in 1 sec: 0.923502 ( -0.20087 0.200871 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.00773e-08 ( -1.33379e-08 1.40913e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.412 sec. to 1.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87227 ( )
Epeak [keV] : 11.5886 ( )
Norm@50keV : 9.60368E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.24 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 56 degrees of freedom
# Null hypothesis probability = 4.656946e-01
Photon flux (15-150 keV) in 1 sec: 0.914443 ( -0.103257 0.204627 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87281e-08 ( -1.39603e-08 1.50527e-08 ) ergs/cm2
Band function
Time interval is from 0.412 sec. to 1.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.98441 ( -0.0791934 1.98442 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 1.86670 ( -1.22127 -1.8667 )
Norm@50keV : 8.27284E-03 ( -0.00179722 0.0756998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.23 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.286782e-01
Photon flux (15-150 keV) in 1 sec: 0.918064 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91783e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.86489 (-1.88344 2.63965)
R^2/D10^2 : 1.05730 (-0.723894 2.18332)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.44 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.199443e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.167e-08 5.441e-09
25- 50 1.983e-08 8.190e-09
50-150 4.922e-09 3.238e-09
15-150 3.643e-08 1.623e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.7524 (-19.0909 44.3679)
Norm : 5.69434 (-1.97725 3.60773)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.64 using 59 PHA bins.
# Reduced chi-squared = 0.9937 for 57 degrees of freedom
# Null hypothesis probability = 4.884395e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.336e-08 4.469e-09
25- 50 1.807e-08 6.083e-09
50-150 1.501e-08 8.587e-09
15-150 4.644e-08 1.849e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.10162 (-5.10543 2.77604)
R1^2/D10^2 : 4.66665 (-3.76211 -4.64496)
kT2 [keV] : 17.8200 (-16.9236 30.4624)
R2^2/D10^2 : 2.72560E-02 (-0.0265026 1.23747)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.51 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 55 degrees of freedom
# Null hypothesis probability = 4.183055e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.403e-08 8.260e-09
25- 50 1.641e-08 8.630e-09
50-150 1.872e-08 1.290e-08
15-150 4.916e-08 2.496e-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: 2.52721 ( -0.346219 0.399758 )
Norm@50keV : 2.01380E-03 ( -0.000579231 0.000577113 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.71 using 59 PHA bins.
# Reduced chi-squared = 0.6616 for 57 degrees of freedom
# Null hypothesis probability = 9.771899e-01
Photon flux (15-150 keV) in 8.984 sec: 0.402287 ( -0.0644778 0.0644975 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82268e-07 ( -3.72444e-08 3.94931e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98046 ( -2.07696 0.016119 )
Epeak [keV] : 1.22064 ( -0.578687 26.1798 )
Norm@50keV : 4.56870E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.79 using 59 PHA bins.
# Reduced chi-squared = 0.6749 for 56 degrees of freedom
# Null hypothesis probability = 9.704716e-01
Photon flux (15-150 keV) in 8.984 sec: 0.399900 ( -0.065884 0.065965 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77667e-07 ( -4.59586e-08 4.3311e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.53593 ( 4.53593 4.53593 )
beta : -2.52722 ( -0.399692 0.346138 )
Epeak [keV] : 4.81946 ( -4.81946 -4.81946 )
Norm@50keV : 0.273702 ( -0.0787239 0.0784395 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.71 using 59 PHA bins.
# Reduced chi-squared = 0.6857 for 55 degrees of freedom
# Null hypothesis probability = 9.637892e-01
Photon flux (15-150 keV) in 8.984 sec: 0.398760 ( 6.60124 -0.063611 ) 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) = 6.06e-08
S(50-100 keV) = 4.21e-08
T90 vs. Hardness ratio plot
T90 = 8.47599995136261 sec.
Hardness ratio (energy fluence ratio) = 0.694719
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.825538
Count Ratio (50-100 keV) / (15-25 keV) = 0.293977
Mask shadow pattern
IMX = 5.125278822604804E-01, IMY = 4.307130417598712E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-400.551400 -382.303200
-239.952000 -6.292000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4378 -60.5787 4.8 46.4 -144.0 1.1069 2.4 4.5 Cen X-3
186.5930 -62.8049 1.6 45.1 -133.0 3.7224 7.3 2.7 GX 301-2
350.5340 -43.3839 2.8 30.8 17.2 0.9121 4.0 ------ UNKNOWN
7.6431 -58.7257 2.1 13.5 37.4 1.0183 5.6 ------ UNKNOWN
125.6891 -47.4216 3.0 51.5 178.3 2.1443 3.9 ------ UNKNOWN
325.3922 -29.3352 3.0 49.9 -7.0 1.6412 3.9 ------ UNKNOWN
290.4424 -67.3939 3.0 27.0 -70.9 0.9566 3.8 ------ UNKNOWN
311.2988 -32.2895 2.3 51.1 -23.1 2.4932 4.9 ------ UNKNOWN
239.3947 -63.3524 4.4 41.2 -99.3 2.9056 2.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.292000 2.692000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.1862 -60.7035 24.8 46.3 -144.1 -0.0329 -0.5 6.1 Cen X-3
186.6574 -62.8694 16.8 45.1 -133.0 -0.0556 -0.7 5.9 GX 301-2
103.8518 -76.6608 2.5 22.3 -165.8 0.1403 4.6 ------ UNKNOWN
307.4205 -52.7192 1.1 33.8 -40.0 0.4250 10.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
76.148590 748.848590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6200 -62.7770 1.4 55.6 -159.9 12.7296 8.1 1.1 GX 301-2
256.0527 -37.9995 45.8 38.1 -96.7 0.3390 0.3 9.8 4U 1700-377
256.2363 -36.3717 8.8 39.0 -94.5 2.5608 1.3 10.1 GX 349+2
264.7946 -44.4563 8.3 28.9 -99.1 0.8784 1.4 2.2 4U 1735-44
270.1551 -25.0515 68.6 39.4 -68.4 0.1904 0.2 7.2 GX 5-1
270.4279 -25.8360 93.1 38.6 -68.8 0.1222 0.1 8.8 GRS 1758-258
275.7288 -30.3803 23.1 32.1 -66.9 0.3044 0.5 10.2 H1820-303
284.9094 -24.8379 7.4 32.7 -48.5 -0.8299 -1.6 8.5 HT1900.1-2455
263.1157 -33.7662 7.6 36.7 -85.1 -1.7124 -1.5 7.5 GX 354-0
320.6722 -42.4199 3.4 13.6 37.6 1.3384 3.4 ------ UNKNOWN
263.5616 -76.4721 2.3 28.9 -168.7 1.9750 5.0 ------ UNKNOWN
306.0356 -2.6744 2.6 50.1 -10.2 3.4519 4.4 ------ UNKNOWN
304.1700 -0.6991 3.6 52.1 -12.5 3.1612 3.2 ------ UNKNOWN
172.7708 -62.8326 3.4 59.1 -166.1 9.5990 3.4 ------ UNKNOWN
249.0092 -54.7842 3.0 33.6 -125.8 2.1067 3.9 ------ UNKNOWN
251.6929 -37.3769 5.2 41.1 -99.4 5.5559 2.2 ------ UNKNOWN
Plot creation:
Sat May 30 21:01:08 EDT 2015