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
276.8710 1.1715 0.0028 27.2378 28.7244 4.2499306 69.350 TRIG_00318101
Foreground time interval of the image:
-0.236 8.969 (delta_t = 9.205 [sec])
Background time interval of the image:
-375.831 -272.868 (delta_t = 102.963 [sec])
-239.932 -0.236 (delta_t = 239.696 [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 0.064000
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 0.064000
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 0.064000
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 -0.236 sec. to 9.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04542 ( -0.0419122 0.0416801 )
Norm@50keV : 3.08787E-02 ( -0.000717056 0.000715643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.49 using 59 PHA bins.
# Reduced chi-squared = 0.7805 for 57 degrees of freedom
# Null hypothesis probability = 8.862805e-01
Photon flux (15-150 keV) in 9.74 sec: 3.56516 ( -0.0863814 0.0865932 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20145e-06 ( -7.47085e-08 7.47965e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.236 sec. to 9.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.864159 ( -0.169948 0.163215 )
Epeak [keV] : 385.724 ( -155.063 2218.46 )
Norm@50keV : 3.66510E-02 ( -0.00284783 0.00618693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.91 using 59 PHA bins.
# Reduced chi-squared = 0.7305 for 56 degrees of freedom
# Null hypothesis probability = 9.350410e-01
Photon flux (15-150 keV) in 9.74 sec: 3.52695 ( -0.09227 0.09254 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18163e-06 ( -7.79005e-08 7.75986e-08 ) ergs/cm2
Band function
Time interval is from -0.236 sec. to 9.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99994 ( -4.99994 -4.99994 )
beta : -1.06877 ( -0.0441953 0.0441636 )
Epeak [keV] : 27.3803 ( -27.3803 3.34596 )
Norm@50keV : 1238.72 ( -27.4627 4.57181e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.89 using 59 PHA bins.
# Reduced chi-squared = 0.7797 for 55 degrees of freedom
# Null hypothesis probability = 8.825533e-01
Photon flux (15-150 keV) in 9.74 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] : 23.2961 ( )
R^2/D10^2 : 0.104122 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 340.52 using 59 PHA bins.
# Reduced chi-squared = 5.9739 for 57 degrees of freedom
# Null hypothesis probability = 5.380619e-42
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.912e-08 4.792e-09
25- 50 5.416e-07 2.036e-08
50-150 2.195e-06 6.964e-08
15-150 2.835e-06 7.938e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 15.2923 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 485.23 using 59 PHA bins.
# Reduced chi-squared = 8.5129 for 57 degrees of freedom
# Null hypothesis probability = 3.247804e-69
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.709e-07 9.350e-09
25- 50 7.135e-07 1.778e-08
50-150 1.565e-06 3.750e-08
15-150 2.649e-06 6.185e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.85776 (-0.917549 1.01225)
R1^2/D10^2 : 1.20120 (-0.331789 0.494577)
kT2 [keV] : 36.3909 (-3.0883 4.14289)
R2^2/D10^2 : 2.22890E-02 (-0.00639008 0.0073869)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7378 for 55 degrees of freedom
# Null hypothesis probability = 9.268299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.169e-07 2.265e-08
25- 50 6.299e-07 3.234e-08
50-150 2.355e-06 1.427e-07
15-150 3.202e-06 1.544e-07
Peak spectrum fit
Power-law model
Time interval is from -0.040 sec. to 0.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.897788 ( -0.0683234 0.0675828 )
Norm@50keV : 6.62900E-02 ( -0.0025527 0.00254154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.78 using 59 PHA bins.
# Reduced chi-squared = 0.8382 for 57 degrees of freedom
# Null hypothesis probability = 8.028314e-01
Photon flux (15-150 keV) in 1 sec: 7.60849 ( -0.292978 0.293223 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.44594e-07 ( -3.01466e-08 3.02027e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.040 sec. to 0.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.731229 ( -0.270918 0.192993 )
Epeak [keV] : 459.657 ( -459.657 -459.657 )
Norm@50keV : 7.79789E-02 ( -0.00994731 0.0226561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.55 using 59 PHA bins.
# Reduced chi-squared = 0.8313 for 56 degrees of freedom
# Null hypothesis probability = 8.118458e-01
Photon flux (15-150 keV) in 1 sec: 7.55476 ( -0.30365 0.30382 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.40367e-07 ( -3.13e-08 3.1168e-08 ) ergs/cm2
Band function
Time interval is from -0.040 sec. to 0.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.924842 ( -0.0719845 0.0721119 )
Epeak [keV] : 26.2172 ( -26.2173 4.27423 )
Norm@50keV : 3087.94 ( -114.369 7.28347e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.37 using 59 PHA bins.
# Reduced chi-squared = 0.8250 for 55 degrees of freedom
# Null hypothesis probability = 8.193718e-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] : 24.5810 ( )
R^2/D10^2 : 0.197894 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 149.06 using 59 PHA bins.
# Reduced chi-squared = 2.6152 for 57 degrees of freedom
# Null hypothesis probability = 3.603674e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.096e-08 1.655e-09
25- 50 1.179e-07 7.050e-09
50-150 5.293e-07 3.080e-08
15-150 6.681e-07 3.025e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 30.6195 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 298.23 using 59 PHA bins.
# Reduced chi-squared = 5.2321 for 57 degrees of freedom
# Null hypothesis probability = 2.193009e-34
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.625e-08 3.245e-09
25- 50 1.467e-07 5.950e-09
50-150 3.217e-07 1.450e-08
15-150 5.446e-07 2.175e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.05956 (-1.41287 1.77172)
R1^2/D10^2 : 3.01331 (-1.34453 2.65977)
kT2 [keV] : 36.0042 (-4.20789 6.60825)
R2^2/D10^2 : 5.60604E-02 (-0.0223981 0.0264919)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.33 using 59 PHA bins.
# Reduced chi-squared = 0.8424 for 55 degrees of freedom
# Null hypothesis probability = 7.910747e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.568e-08 8.890e-09
25- 50 1.297e-07 1.625e-08
50-150 5.726e-07 6.085e-08
15-150 7.480e-07 6.965e-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: 1.02224 ( -0.0420529 0.0418116 )
Norm@50keV : 3.18347E-02 ( -0.000744115 0.000742543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.56 using 59 PHA bins.
# Reduced chi-squared = 0.7642 for 57 degrees of freedom
# Null hypothesis probability = 9.049805e-01
Photon flux (15-150 keV) in 9.205 sec: 3.66975 ( -0.0889489 0.0891803 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14416e-06 ( -7.36354e-08 7.37276e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.835001 ( -0.17112 0.146971 )
Epeak [keV] : 384.978 ( -152.505 1830.48 )
Norm@50keV : 3.79623E-02 ( -0.00295431 0.00641329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.78 using 59 PHA bins.
# Reduced chi-squared = 0.7104 for 56 degrees of freedom
# Null hypothesis probability = 9.502332e-01
Photon flux (15-150 keV) in 9.205 sec: 3.62984 ( -0.09488 0.09516 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1248e-06 ( -7.66408e-08 7.63371e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99995 ( -4.99995 -4.99995 )
beta : -1.04221 ( -0.0440151 0.044014 )
Epeak [keV] : 26.8782 ( -26.8782 3.54891 )
Norm@50keV : 1398.23 ( -31.0861 4.81834e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.12 using 59 PHA bins.
# Reduced chi-squared = 0.7657 for 55 degrees of freedom
# Null hypothesis probability = 8.988690e-01
Photon flux (15-150 keV) in 9.205 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) = 6.11e-07
S(50-100 keV) = 1.18e-06
T90 vs. Hardness ratio plot
T90 = 8.66400000452995 sec.
Hardness ratio (energy fluence ratio) = 1.93126
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.88518
Count Ratio (50-100 keV) / (15-25 keV) = 2.02665
Mask shadow pattern
IMX = 4.514183272895041E-01, IMY = -2.473942593577021E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000
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:
-375.831400 -272.868400
-239.932000 -0.236000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9817 -15.6326 0.3 29.1 -52.2 12.5978 36.8 0.5 Sco X-1
255.9078 -37.8101 1.8 19.5 -109.1 1.7379 6.2 4.3 4U 1700-377
256.2565 -36.3331 4.1 18.5 -105.6 0.7974 2.8 10.2 GX 349+2
263.2150 -24.8393 0.0 10.0 -63.2 0.4156 1.6 12.6 GX 1+4
264.8726 -44.3492 10.4 19.9 -137.2 0.2734 1.1 8.2 4U 1735-44
268.3485 -1.4151 2.5 25.2 9.0 1.3313 4.7 2.5 SW J1753.5-0127
270.2906 -25.0798 3.0 3.6 -54.2 1.0686 3.9 0.4 GX 5-1
270.2637 -25.7788 3.2 3.5 -65.3 1.0047 3.6 3.0 GRS 1758-258
274.0218 -14.0373 0.8 11.9 22.0 3.2667 13.8 0.9 GX 17+2
275.7437 -30.3544 4.6 4.6 -173.9 0.6874 2.5 9.4 H1820-303
284.9453 -24.7966 7.4 9.8 108.5 0.3811 1.6 8.9 HT1900.1-2455
288.8381 10.9296 1.7 39.5 45.8 4.6010 6.9 2.5 GRS 1915+105
263.2091 -33.9146 3.7 12.4 -109.7 0.8440 3.1 12.0 GX 354-0
287.4268 6.2411 3.3 34.7 46.5 1.5764 3.5 ------ UNKNOWN
339.5633 -68.1915 3.6 56.9 179.1 5.9014 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.236000 8.968600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0970 -15.7518 16.8 29.0 -52.3 -0.0467 -0.7 9.5 Sco X-1
255.7922 -37.8454 3.3 19.6 -109.0 -0.2072 -3.5 9.2 4U 1700-377
256.5877 -36.2998 3.4 18.2 -106.0 0.1999 3.4 10.4 GX 349+2
262.9117 -24.6189 8.2 10.3 -62.2 0.0773 1.4 9.3 GX 1+4
264.7396 -44.4499 15.3 20.0 -137.1 0.0421 0.8 0.1 4U 1735-44
268.3905 -1.6040 5.4 25.0 9.0 0.1249 2.1 9.2 SW J1753.5-0127
270.4289 -25.0026 43.4 3.5 -52.5 0.0130 0.3 9.1 GX 5-1
270.3837 -25.7025 9.0 3.4 -63.9 -0.0658 -1.3 5.0 GRS 1758-258
273.8670 -14.0959 6.0 11.9 21.3 0.0999 1.9 8.8 GX 17+2
275.9494 -30.3773 61.0 4.7 -175.9 -0.0101 -0.2 1.4 H1820-303
285.1855 -24.8568 13.5 10.0 109.0 0.0463 0.9 9.0 HT1900.1-2455
288.8203 11.0116 5.1 39.6 45.8 0.3168 2.3 4.2 GRS 1915+105
263.1108 -33.6967 4.8 12.3 -108.7 0.1276 2.4 10.3 GX 354-0
276.8710 1.1715 0.2 27.2 28.7 4.2498 69.3 ------ UNKNOWN
332.6135 -79.3812 3.1 58.9 -167.7 1.1466 3.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
83.168590 656.268590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0008 -15.6568 0.4 35.7 -155.1 16.1821 27.6 1.6 Sco X-1
254.3037 35.2615 11.7 40.0 -64.9 1.8317 1.0 9.0 Her X-1
256.0232 -37.9153 3.7 43.6 168.4 2.6430 3.1 4.6 4U 1700-377
256.5114 -36.4705 6.3 42.1 169.0 1.5167 1.8 4.6 GX 349+2
262.9108 -24.8657 6.3 29.4 170.9 0.9626 1.8 9.0 GX 1+4
264.7693 -44.4298 4.7 46.9 156.2 3.2977 2.5 1.7 4U 1735-44
268.3778 -1.4619 1.8 8.9 -142.9 2.9484 6.3 0.8 SW J1753.5-0127
270.3036 -25.2715 0.0 27.2 157.4 1.0511 1.8 11.6 GX 5-1
270.3390 -25.7314 7.9 27.6 157.1 0.9218 1.6 2.1 GRS 1758-258
273.9812 -14.0468 1.4 15.5 154.9 3.5482 8.3 1.6 GX 17+2
275.9199 -30.3509 5.3 31.5 145.9 1.5309 2.2 1.0 H1820-303
285.1414 -25.0327 6.6 27.4 127.9 -1.0563 -1.7 8.8 HT1900.1-2455
288.8150 10.9733 0.6 15.4 14.2 8.2066 20.4 1.9 GRS 1915+105
299.5662 35.2178 0.4 40.1 -6.4 18.8654 29.6 1.5 Cyg X-1
308.1956 40.9099 5.8 48.8 -4.2 2.1177 2.0 4.6 Cyg X-3
263.1194 -33.8138 4.8 37.3 163.3 1.7907 2.4 6.6 GX 354-0
313.9614 -12.7530 3.1 39.3 76.2 6.7306 3.7 ------ UNKNOWN
314.1883 -12.3117 3.7 39.4 75.5 5.9947 3.4 ------ UNKNOWN
267.3173 -48.6008 3.4 50.5 152.5 6.6141 3.4 ------ UNKNOWN
302.7436 -7.4416 2.2 27.2 73.2 3.2979 5.2 ------ UNKNOWN
252.2535 -34.2455 2.4 42.3 175.1 3.6357 4.9 ------ UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Sun May 31 06:51:24 EDT 2015