Click here for the BAT GCN circular template
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
325.1268 58.7486 0.0037 25.2363 147.7404 5.0542843 52.064 TRIG_00583338
Foreground time interval of the image:
-24.908 11.485 (delta_t = 36.393 [sec])
Background time interval of the image:
-239.016 -24.908 (delta_t = 214.108 [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 0.512000
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 0.512000
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 0.512000
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 -24.908 sec. to 103.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53369 ( -0.0467481 0.0467632 )
Norm@50keV : 5.90363E-03 ( -0.00013878 0.000138778 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.70 using 59 PHA bins.
# Reduced chi-squared = 0.7842 for 57 degrees of freedom
# Null hypothesis probability = 8.816537e-01
Photon flux (15-150 keV) in 128.2 sec: 0.743885 ( -0.0198577 0.0199706 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.14203e-06 ( -1.75944e-07 1.76284e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.908 sec. to 103.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53163 ( -0.112772 0.0467445 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.91954E-03 ( -0.000138937 0.00116036 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.70 using 59 PHA bins.
# Reduced chi-squared = 0.7983 for 56 degrees of freedom
# Null hypothesis probability = 8.609846e-01
Photon flux (15-150 keV) in 128.2 sec: 0.743772 ( -0.021749 0.019423 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.14256e-06 ( -1.67737e-07 1.74839e-07 ) ergs/cm2
Band function
Time interval is from -24.908 sec. to 103.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28020 ( 1.23007 1.23007 )
beta : -1.55675 ( 1.55606 0.0649008 )
Epeak [keV] : 106.316 ( -99.7531 -99.7531 )
Norm@50keV : 8.28910E-03 ( -0.00241702 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.21 using 59 PHA bins.
# Reduced chi-squared = 0.8037 for 55 degrees of freedom
# Null hypothesis probability = 8.510208e-01
Photon flux (15-150 keV) in 128.2 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] : 16.4986 ( )
R^2/D10^2 : 5.66580E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 451.73 using 59 PHA bins.
# Reduced chi-squared = 7.9252 for 57 degrees of freedom
# Null hypothesis probability = 8.622864e-63
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.059e-07 2.026e-08
25- 50 1.752e-06 5.897e-08
50-150 3.372e-06 1.577e-07
15-150 5.530e-06 1.532e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.02015 (-0.0710736 0.0710722)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.02 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.744753e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.644e-07 2.654e-08
25- 50 1.855e-06 5.000e-08
50-150 4.069e-06 1.045e-07
15-150 6.888e-06 1.929e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.83797 (-0.670125 0.705557)
R1^2/D10^2 : 0.530529 (-0.1327 0.193164)
kT2 [keV] : 30.9554 (-3.03226 4.02135)
R2^2/D10^2 : 5.15227E-03 (-0.0017299 0.00223372)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.70 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.113139e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.410e-07 6.634e-08
25- 50 1.863e-06 8.269e-08
50-150 4.362e-06 3.590e-07
15-150 7.066e-06 4.000e-07
Peak spectrum fit
Power-law model
Time interval is from 6.488 sec. to 7.488 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42447 ( -0.0844175 0.0848293 )
Norm@50keV : 4.95578E-02 ( -0.00242502 0.00242142 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.19 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.954461e-01
Photon flux (15-150 keV) in 1 sec: 6.06958 ( -0.300102 0.300401 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7653e-07 ( -2.57998e-08 2.59065e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.488 sec. to 7.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09255 ( -0.338587 0.314424 )
Epeak [keV] : 143.011 ( -47.5717 943.54 )
Norm@50keV : 7.19274E-02 ( -0.0208709 0.0320526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 0.9983 for 56 degrees of freedom
# Null hypothesis probability = 4.783473e-01
Photon flux (15-150 keV) in 1 sec: 5.97669 ( -0.31219 0.31218 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.66754e-07 ( -2.78e-08 2.7708e-08 ) ergs/cm2
Band function
Time interval is from 6.488 sec. to 7.488 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09259 ( -0.304868 0.351516 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 143.002 ( -39.9743 929.476 )
Norm@50keV : 7.19165E-02 ( -0.0208504 0.0320634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Null hypothesis probability = 4.405519e-01
Photon flux (15-150 keV) in 1 sec: 5.98653 ( ) 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] : 16.4325 ( )
R^2/D10^2 : 0.508741 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 147.91 using 59 PHA bins.
# Reduced chi-squared = 2.5949 for 57 degrees of freedom
# Null hypothesis probability = 5.208886e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.823e-08 2.670e-09
25- 50 1.215e-07 8.750e-09
50-150 2.316e-07 2.030e-08
15-150 3.813e-07 2.200e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 24.8861 (-1.21384 1.21388)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.24 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.656365e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.231e-08 3.415e-09
25- 50 1.199e-07 6.400e-09
50-150 2.629e-07 1.605e-08
15-150 4.451e-07 4.860e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.61073 (-1.00902 1.18351)
R1^2/D10^2 : 6.96879 (-2.98189 5.70005)
kT2 [keV] : 25.8160 (-3.11577 4.39487)
R2^2/D10^2 : 8.95140E-02 (-0.0384037 0.0534395)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9539 for 55 degrees of freedom
# Null hypothesis probability = 5.720537e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.611e-08 9.965e-09
25- 50 1.149e-07 1.533e-08
50-150 2.962e-07 4.555e-08
15-150 4.672e-07 7.240e-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: 1.71161 ( -0.0650569 0.0654396 )
Norm@50keV : 8.34967E-03 ( -0.000286824 0.000285861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.49 using 59 PHA bins.
# Reduced chi-squared = 0.6577 for 57 degrees of freedom
# Null hypothesis probability = 9.786576e-01
Photon flux (15-150 keV) in 36.39 sec: 1.11346 ( -0.0403387 0.0405399 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81075e-06 ( -1.00372e-07 1.00795e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60689 ( -0.258051 0.144712 )
Epeak [keV] : 191.519 ( )
Norm@50keV : 9.39429E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.97 using 59 PHA bins.
# Reduced chi-squared = 0.6601 for 56 degrees of freedom
# Null hypothesis probability = 9.767422e-01
Photon flux (15-150 keV) in 36.39 sec: 1.10451 ( -0.04502 0.04503 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78714e-06 ( -1.16179e-07 1.14891e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06142 ( 1.17392 1.17392 )
beta : -1.73859 ( 1.73919 0.0827438 )
Epeak [keV] : 43.0028 ( -42.857 179.34 )
Norm@50keV : 2.28310E-02 ( -0.0231652 1.48159e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.71 using 59 PHA bins.
# Reduced chi-squared = 0.6675 for 55 degrees of freedom
# Null hypothesis probability = 9.725804e-01
Photon flux (15-150 keV) in 36.39 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) = 1.80e-06
S(50-100 keV) = 2.48e-06
T90 vs. Hardness ratio plot
T90 = 95.2319999337196 sec.
Hardness ratio (energy fluence ratio) = 1.37778
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.29794
Count Ratio (50-100 keV) / (15-25 keV) = 0.946918
Mask shadow pattern
IMX = -3.985814177049650E-01, IMY = -2.515799622929416E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-239.016000 -24.908000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.2142 35.4018 4.8 26.0 -15.6 -0.4875 -2.4 12.4 Her X-1
288.8078 10.9377 3.0 38.5 -91.7 2.6302 3.8 0.7 GRS 1915+105
299.5913 35.1964 0.7 18.0 -128.7 3.1827 16.1 0.3 Cyg X-1
308.0871 40.9398 4.7 18.6 -157.0 0.4748 2.5 1.3 Cyg X-3
326.0465 38.2240 4.5 31.6 -170.2 0.5725 2.6 8.3 Cyg X-2
220.8443 56.5081 2.7 37.6 41.1 1.5394 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-24.908000 11.484610
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5480 35.5246 0.0 25.7 -15.8 -0.1134 -1.2 11.8 Her X-1
288.7110 11.0357 6.5 38.4 -91.6 0.5136 1.8 7.5 GRS 1915+105
299.7138 35.1949 5.2 18.0 -129.0 -0.2066 -2.2 6.1 Cyg X-1
308.2616 40.7852 0.0 18.8 -156.9 0.0778 0.9 12.2 Cyg X-3
326.2613 38.1970 5.7 31.7 -170.4 -0.2006 -2.0 8.6 Cyg X-2
258.3709 79.6485 2.7 31.7 86.6 0.7505 4.2 ------ UNKNOWN
339.9524 73.3200 2.1 33.7 120.5 0.9984 5.6 ------ UNKNOWN
329.4897 61.5703 2.2 27.6 141.8 0.5645 5.2 ------ UNKNOWN
325.1267 58.7486 0.2 25.2 147.7 5.0543 52.1 ------ UNKNOWN
294.7614 23.6089 2.6 26.9 -106.1 0.5201 4.4 ------ UNKNOWN
345.3646 15.8777 2.2 59.2 -163.0 2.8389 5.2 ------ UNKNOWN
295.5401 19.1554 2.3 31.4 -105.2 0.6776 5.0 ------ UNKNOWN
235.8431 6.6854 2.6 58.9 -24.3 2.5055 4.5 ------ UNKNOWN
270.8260 7.3526 3.1 43.5 -65.0 1.4038 3.7 ------ UNKNOWN
282.8623 8.1908 2.3 41.1 -82.4 1.8224 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
57.684600 963.074000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.6449 35.3596 5.3 50.5 -27.2 -2.7598 -2.2 9.2 Her X-1
299.5711 35.2087 0.6 28.9 -75.4 14.2155 18.8 1.0 Cyg X-1
308.1232 40.9418 1.5 20.8 -83.7 5.1667 8.0 0.9 Cyg X-3
326.1208 38.4087 3.4 20.4 -124.4 2.0054 3.4 5.7 Cyg X-2
20.2762 62.0705 2.7 26.6 117.0 2.9145 4.2 ------ UNKNOWN
325.1374 58.7317 0.7 0.0 -117.7 7.9286 16.2 ------ UNKNOWN
256.4141 56.9106 2.4 35.0 -4.7 3.4044 4.7 ------ UNKNOWN
306.8691 59.1682 2.5 9.4 -21.9 2.3956 4.6 ------ UNKNOWN
318.6966 15.7663 3.0 43.3 -113.1 9.6392 3.9 ------ UNKNOWN
Plot creation:
Sat May 30 14:42:51 EDT 2015