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
328.8412 -1.8361 0.0256 18.7200 -131.2042 0.3377734 7.475 TRIG_00175603
Foreground time interval of the image:
-0.896 22.104 (delta_t = 23.000 [sec])
Background time interval of the image:
-299.896 -0.896 (delta_t = 299.000 [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)
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 -0.896 sec. to 22.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24394 ( -0.387174 0.376932 )
Norm@50keV : 1.01434E-03 ( -0.000194738 0.000194725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 0.9739 for 57 degrees of freedom
# Null hypothesis probability = 5.311241e-01
Photon flux (15-150 keV) in 23 sec: 0.119852 ( -0.023963 0.0240364 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33853e-07 ( -5.04268e-08 5.10405e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.896 sec. to 22.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50245 ( )
Epeak [keV] : 163.606 ( )
Norm@50keV : 2.34284E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.65 using 59 PHA bins.
# Reduced chi-squared = 0.9759 for 56 degrees of freedom
# Null hypothesis probability = 5.261341e-01
Photon flux (15-150 keV) in 23 sec: 0.120391 ( -0.0245978 0.023565 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33827e-07 ( -5.01057e-08 4.96455e-08 ) ergs/cm2
Band function
Time interval is from -0.896 sec. to 22.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00576 ( 1.00636 1.00636 )
beta : -1.24388 ( 1.2439 0.387132 )
Epeak [keV] : 47.2691 ( -46.6192 -46.6192 )
Norm@50keV : 1.83318E-03 ( -0.00101507 0.16252 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 4.553682e-01
Photon flux (15-150 keV) in 23 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] : 20.5385 (-5.13854 7.98003)
R^2/D10^2 : 4.82474E-03 (-0.00311108 0.00764317)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.90 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.206478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.927e-09 4.347e-09
25- 50 4.525e-08 1.814e-08
50-150 1.420e-07 5.981e-08
15-150 1.961e-07 7.399e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.495461 (-0.0971084 0.0970998)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.43 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.224488e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.838e-08 1.667e-08
25- 50 5.459e-08 3.198e-08
50-150 1.197e-07 6.815e-08
15-150 2.027e-07 1.179e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.65388 (-2.97269 2.35148)
R1^2/D10^2 : 1.82332 (-1.70079 -1.7751)
kT2 [keV] : 26.9377 (-8.19164 17.9262)
R2^2/D10^2 : 1.89542E-03 (-0.00163 0.0061627)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.74 using 59 PHA bins.
# Reduced chi-squared = 0.9952 for 55 degrees of freedom
# Null hypothesis probability = 4.846996e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.945e-08 1.651e-08
25- 50 3.772e-08 1.900e-08
50-150 1.647e-07 9.580e-08
15-150 2.318e-07 1.127e-07
Peak spectrum fit
Power-law model
Time interval is from 0.104 sec. to 1.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.627030 ( -0.695139 0.554258 )
Norm@50keV : 3.32321E-03 ( -0.00121276 0.00106957 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7826 for 57 degrees of freedom
# Null hypothesis probability = 8.836512e-01
Photon flux (15-150 keV) in 1 sec: 0.386783 ( -0.115038 0.117417 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19543e-08 ( -1.16528e-08 1.16932e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.104 sec. to 1.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.629739 ( -1.02071 0.547826 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.36265E-03 ( -0.00122178 0.010633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.62 using 59 PHA bins.
# Reduced chi-squared = 0.7968 for 56 degrees of freedom
# Null hypothesis probability = 8.630146e-01
Photon flux (15-150 keV) in 1 sec: 0.389399 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19346e-08 ( -1.16261e-08 1.15516e-08 ) ergs/cm2
Band function
Time interval is from 0.104 sec. to 1.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.789169 ( 0.788984 0.788984 )
beta : -0.626965 ( -0.553384 0.695229 )
Epeak [keV] : 15.0897 ( -15.0904 -15.0904 )
Norm@50keV : 4.92863E-03 ( -0.00269451 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.8111 for 55 degrees of freedom
# Null hypothesis probability = 8.404512e-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] : 35.9122 (-13.646 46.9137)
R^2/D10^2 : 3.58046E-03 (-0.00357715 0.0104226)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.04 using 59 PHA bins.
# Reduced chi-squared = 0.8253 for 57 degrees of freedom
# Null hypothesis probability = 8.237104e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.426e-10 4.091e-10
25- 50 4.238e-09 2.516e-09
50-150 3.521e-08 2.032e-08
15-150 4.009e-08 2.324e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.60958 (-0.486659 0.486607)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.73 using 59 PHA bins.
# Reduced chi-squared = 0.9250 for 57 degrees of freedom
# Null hypothesis probability = 6.360616e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.011e-09 2.503e-09
25- 50 7.716e-09 4.747e-09
50-150 1.692e-08 1.022e-08
15-150 2.865e-08 1.730e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.26544 (-4.06235 27.1316)
R1^2/D10^2 : 0.827525 (-0.823656 2282.59)
kT2 [keV] : 46.9576 (-21.1387 -46.9979)
R2^2/D10^2 : 1.73197E-03 (-0.00170749 0.00317138)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.08 using 59 PHA bins.
# Reduced chi-squared = 0.8014 for 55 degrees of freedom
# Null hypothesis probability = 8.542257e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.902e-09 1.901e-09
25- 50 4.941e-09 2.595e-09
50-150 3.583e-08 2.093e-08
15-150 4.368e-08 2.320e-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: 1.24394 ( -0.387174 0.376932 )
Norm@50keV : 1.01434E-03 ( -0.000194738 0.000194725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 0.9739 for 57 degrees of freedom
# Null hypothesis probability = 5.311241e-01
Photon flux (15-150 keV) in 23 sec: 0.119852 ( -0.023963 0.0240364 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33853e-07 ( -5.04268e-08 5.10405e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50245 ( )
Epeak [keV] : 163.606 ( )
Norm@50keV : 2.34284E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.65 using 59 PHA bins.
# Reduced chi-squared = 0.9759 for 56 degrees of freedom
# Null hypothesis probability = 5.261341e-01
Photon flux (15-150 keV) in 23 sec: 0.120391 ( -0.0245978 0.023565 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33827e-07 ( -5.01057e-08 4.96455e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00576 ( 1.00636 1.00636 )
beta : -1.24388 ( 1.2439 0.387132 )
Epeak [keV] : 47.2691 ( -46.6192 -46.6192 )
Norm@50keV : 1.83318E-03 ( -0.00101507 0.16252 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 4.553682e-01
Photon flux (15-150 keV) in 23 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) = 5.04e-08
S(50-100 keV) = 8.51e-08
T90 vs. Hardness ratio plot
T90 = 19 sec.
Hardness ratio (energy fluence ratio) = 1.68849
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.09461
Count Ratio (50-100 keV) / (15-25 keV) = 1.29868
Mask shadow pattern
IMX = -2.232284873169235E-01, IMY = 2.549541479013678E-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:
-299.896000 -0.896000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.7957 10.9740 1.1 39.1 -44.0 3.7490 10.7 1.7 GRS 1915+105
299.5835 35.2031 0.2 31.7 0.2 13.3176 56.1 0.3 Cyg X-1
308.1185 40.9485 1.4 29.9 17.2 1.8069 8.3 0.4 Cyg X-3
326.1898 38.3277 4.5 21.6 44.0 0.5383 2.5 0.9 Cyg X-2
1.7150 18.5198 2.2 31.5 131.3 1.6682 5.4 ------ UNKNOWN
345.4014 19.3923 2.9 16.1 127.8 0.8153 4.0 ------ UNKNOWN
288.2746 39.9964 2.4 41.8 1.2 1.5316 4.8 ------ UNKNOWN
359.3392 -13.0381 2.7 42.6 -177.9 1.3754 4.2 ------ UNKNOWN
333.7745 -0.9167 2.4 18.5 -147.0 0.9223 4.8 ------ UNKNOWN
344.6352 -18.6544 2.6 38.9 -155.2 1.3991 4.4 ------ UNKNOWN
4.2901 -31.1482 3.0 59.0 -166.2 6.8941 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.896000 22.104000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
288.8473 10.7383 17.1 39.1 -44.4 0.0503 0.7 12.8 GRS 1915+105
299.4214 35.1297 6.0 31.8 0.0 0.0963 1.9 9.3 Cyg X-1
308.2726 40.9512 18.1 29.8 17.3 -0.0336 -0.6 7.4 Cyg X-3
325.9448 38.3394 5.6 21.6 43.5 -0.0979 -2.0 10.7 Cyg X-2
355.3316 -20.9543 2.5 46.0 -166.3 0.3642 4.6 ------ UNKNOWN
328.8412 -1.8360 1.5 18.7 -131.2 0.3379 7.5 ------ UNKNOWN
325.5025 -21.9398 2.3 38.9 -126.0 0.3949 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
Plot creation:
Sun May 31 14:48:56 EDT 2015