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
249.0110 41.8965 0.0129 44.0498 1.3103 1.3477601 14.891 TRIG_00602884
Foreground time interval of the image:
-6.184 11.573 (delta_t = 17.757 [sec])
Background time interval of the image:
-239.528 -6.184 (delta_t = 233.344 [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 1.024000
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 1.024000
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 1.024000
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 -6.184 sec. to 48.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85109 ( -0.106442 0.108493 )
Norm@50keV : 4.54100E-03 ( -0.00029294 0.000290561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.64 using 59 PHA bins.
# Reduced chi-squared = 0.7482 for 57 degrees of freedom
# Null hypothesis probability = 9.212672e-01
Photon flux (15-150 keV) in 54.85 sec: 0.638570 ( -0.0389649 0.0390461 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29015e-06 ( -1.47974e-07 1.48843e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.184 sec. to 48.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33408 ( -0.463377 0.418865 )
Epeak [keV] : 60.9244 ( -11.9961 55.6022 )
Norm@50keV : 8.47879E-03 ( -0.00329615 0.00620593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.09 using 59 PHA bins.
# Reduced chi-squared = 0.6801 for 56 degrees of freedom
# Null hypothesis probability = 9.679865e-01
Photon flux (15-150 keV) in 54.85 sec: 0.621133 ( -0.041259 0.041315 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1991e-06 ( -1.64901e-07 1.65735e-07 ) ergs/cm2
Band function
Time interval is from -6.184 sec. to 48.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33407 ( -0.3132 0.518763 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 60.9128 ( -11.9986 55.5591 )
Norm@50keV : 8.47776E-03 ( -0.00329452 0.0062134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.09 using 59 PHA bins.
# Reduced chi-squared = 0.6925 for 55 degrees of freedom
# Null hypothesis probability = 9.599952e-01
Photon flux (15-150 keV) in 54.85 sec: 0.624076 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19777e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2450 (-0.90743 0.978483)
R^2/D10^2 : 0.137495 (-0.0344398 0.046178)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.01 using 59 PHA bins.
# Reduced chi-squared = 1.7545 for 57 degrees of freedom
# Null hypothesis probability = 3.754401e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.395e-07 2.679e-08
25- 50 7.717e-07 5.622e-08
50-150 7.050e-07 9.873e-08
15-150 1.716e-06 1.188e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 94.9140 (-17.9168 25.4094)
Norm : 2.83400 (-0.244633 0.275002)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.10 using 59 PHA bins.
# Reduced chi-squared = 0.6684 for 57 degrees of freedom
# Null hypothesis probability = 9.744934e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.061e-07 4.435e-08
25- 50 6.947e-07 4.991e-08
50-150 1.092e-06 3.387e-07
15-150 2.193e-06 3.494e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.15487 (-1.02989 1.14152)
R1^2/D10^2 : 1.19054 (-0.538884 1.1807)
kT2 [keV] : 20.8301 (-3.1163 4.61829)
R2^2/D10^2 : 1.41677E-02 (-0.00780487 0.0133653)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.80 using 59 PHA bins.
# Reduced chi-squared = 0.6509 for 55 degrees of freedom
# Null hypothesis probability = 9.791143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.046e-07 1.007e-07
25- 50 6.858e-07 1.305e-07
50-150 1.093e-06 3.315e-07
15-150 2.183e-06 5.096e-07
Peak spectrum fit
Power-law model
Time interval is from 12.100 sec. to 13.100 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35453 ( -0.136939 0.136876 )
Norm@50keV : 3.58574E-02 ( -0.00294819 0.00294802 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.02 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.720353e-01
Photon flux (15-150 keV) in 1 sec: 4.32383 ( -0.373237 0.374134 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49856e-07 ( -3.08075e-08 3.08973e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.100 sec. to 13.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.800751 ( -0.627024 0.545398 )
Epeak [keV] : 120.901 ( -37.6113 1298.14 )
Norm@50keV : 6.46244E-02 ( -0.0278903 0.0582434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.01 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 56 degrees of freedom
# Null hypothesis probability = 3.326860e-01
Photon flux (15-150 keV) in 1 sec: 4.23072 ( -0.38455 0.38527 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43411e-07 ( -3.217e-08 3.1996e-08 ) ergs/cm2
Band function
Time interval is from 12.100 sec. to 13.100 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.801023 ( -0.415644 0.617623 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 120.917 ( -27.3269 368.873 )
Norm@50keV : 6.46022E-02 ( -0.0278958 0.0582373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.01 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 2.992096e-01
Photon flux (15-150 keV) in 1 sec: 4.25669 ( ) 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] : 18.0475 (-1.74562 1.97875)
R^2/D10^2 : 0.275701 (-0.0832056 0.115679)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.78 using 59 PHA bins.
# Reduced chi-squared = 1.470 for 57 degrees of freedom
# Null hypothesis probability = 1.200236e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.796e-08 2.960e-09
25- 50 8.324e-08 9.845e-09
50-150 1.969e-07 2.725e-08
15-150 2.982e-07 3.195e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 18.1376 (-1.5002 1.50003)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.75 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.560292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.516e-08 5.080e-09
25- 50 8.687e-08 9.645e-09
50-150 1.905e-07 8.829e-08
15-150 3.226e-07 1.039e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12960 (-3.45595 4.11773)
R1^2/D10^2 : 3.18902 (-2.21723 39.0304)
kT2 [keV] : 25.5524 (-5.66999 14.3828)
R2^2/D10^2 : 7.03319E-02 (-0.0553741 0.111054)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.67 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.498700e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.442e-08 1.644e-08
25- 50 8.287e-08 3.100e-08
50-150 2.249e-07 7.791e-08
15-150 3.422e-07 1.116e-07
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: 1.97765 ( -0.192178 0.201545 )
Norm@50keV : 4.63627E-03 ( -0.000585579 0.000572454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.39 using 59 PHA bins.
# Reduced chi-squared = 0.7262 for 57 degrees of freedom
# Null hypothesis probability = 9.403619e-01
Photon flux (15-150 keV) in 17.76 sec: 0.688392 ( -0.0731269 0.0732261 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58521e-07 ( -9.05962e-08 9.18952e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60949 ( -0.836465 0.555854 )
Epeak [keV] : 47.3321 ( )
Norm@50keV : 7.40137E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.63 using 59 PHA bins.
# Reduced chi-squared = 0.7255 for 56 degrees of freedom
# Null hypothesis probability = 9.391128e-01
Photon flux (15-150 keV) in 17.76 sec: 0.677397 ( -0.076158 0.076091 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.35443e-07 ( -1.00582e-07 1.02013e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60949 ( -3.43765 0.9042 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 47.3230 ( -19.5466 -47.323 )
Norm@50keV : 7.39992E-03 ( -0.00280911 0.00937581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.63 using 59 PHA bins.
# Reduced chi-squared = 0.7387 for 55 degrees of freedom
# Null hypothesis probability = 9.260535e-01
Photon flux (15-150 keV) in 17.76 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.39384e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.57e-07
S(50-100 keV) = 7.28e-07
T90 vs. Hardness ratio plot
T90 = 38.272000014782 sec.
Hardness ratio (energy fluence ratio) = 1.10807
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.34108
Count Ratio (50-100 keV) / (15-25 keV) = 0.858086
Mask shadow pattern
IMX = 9.671182509658034E-01, IMY = -2.212094006979784E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-239.528000 -6.184000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9809 -15.6501 0.4 24.4 115.9 7.5321 26.5 0.6 Sco X-1
254.4494 35.3378 7.6 41.3 12.1 0.5618 1.5 0.5 Her X-1
268.4761 -1.5624 6.4 40.6 73.6 1.7230 1.8 9.2 SW J1753.5-0127
218.9160 -4.9594 2.3 11.5 -149.0 1.0739 5.1 ------ UNKNOWN
236.7681 56.1730 2.6 54.6 -15.3 2.6694 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-6.184000 11.572600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0615 -15.5188 9.9 24.4 115.6 0.0853 1.2 8.7 Sco X-1
254.5387 35.2180 15.8 41.3 12.3 -0.0658 -0.7 8.5 Her X-1
268.3561 -1.3372 401.5 40.5 73.3 -0.0067 -0.0 7.0 SW J1753.5-0127
249.0111 41.8965 0.8 44.0 1.3 1.3472 14.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
80.172600 962.479200
1036.472000 1036.572590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3749 35.3939 2.9 7.7 84.2 2.0815 4.0 5.1 Her X-1
299.5822 35.2012 0.6 39.5 21.4 16.8646 19.5 0.4 Cyg X-1
308.0791 40.9311 1.9 43.4 9.4 5.3730 6.1 1.9 Cyg X-3
224.7334 -1.6809 3.0 48.8 151.9 8.3006 3.9 ------ UNKNOWN
215.8410 7.2097 3.2 45.4 168.5 4.2882 3.6 ------ UNKNOWN
266.2665 38.3511 3.4 13.6 38.1 1.6636 3.4 ------ UNKNOWN
233.4060 27.7129 2.9 19.0 165.7 2.2238 4.1 ------ UNKNOWN
324.2932 42.5265 2.6 53.8 0.9 7.3251 4.4 ------ UNKNOWN
236.5050 56.1888 2.6 16.4 -86.4 2.4717 4.4 ------ UNKNOWN
331.0364 63.8267 2.6 49.9 -26.3 5.3121 4.5 ------ UNKNOWN
263.7157 86.6125 2.5 44.9 -60.0 13.2985 4.7 ------ UNKNOWN
Plot creation:
Sat May 30 13:06:59 EDT 2015