Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
224.4774 -11.7086 0.0068 56.5228 3.2412 16.9051805 28.470 TRIG_00317508
Foreground time interval of the image:
-9.516 14.965 (delta_t = 24.481 [sec])
Background time interval of the image:
-677.935 -668.876 (delta_t = 9.059 [sec])
-239.936 -9.516 (delta_t = 230.420 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -10.248 sec. to 360.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12523 ( -0.0783322 0.0774632 )
Norm@50keV : 4.02609E-03 ( -0.000177428 0.000176555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.08 using 59 PHA bins.
# Reduced chi-squared = 0.8434 for 57 degrees of freedom
# Null hypothesis probability = 7.940528e-01
Photon flux (15-150 keV) in 370.4 sec: 0.468206 ( -0.0221411 0.0222436 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54683e-05 ( -6.58075e-07 6.58649e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.248 sec. to 360.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12364 ( -0.0818311 0.0754409 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.04746E-03 ( -0.000177263 0.000942331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.11 using 59 PHA bins.
# Reduced chi-squared = 0.8591 for 56 degrees of freedom
# Null hypothesis probability = 7.641879e-01
Photon flux (15-150 keV) in 370.4 sec: 0.467993 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54725e-05 ( -6.55904e-07 6.56164e-07 ) ergs/cm2
Band function
Time interval is from -10.248 sec. to 360.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.869003 ( 0.869158 0.869158 )
beta : -1.12523 ( -0.0776175 0.0783427 )
Epeak [keV] : 58.6853 ( -58.5536 -58.5536 )
Norm@50keV : 7.30406E-03 ( -0.00277619 226703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.08 using 59 PHA bins.
# Reduced chi-squared = 0.8741 for 55 degrees of freedom
# Null hypothesis probability = 7.342789e-01
Photon flux (15-150 keV) in 370.4 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] : 23.9246 ( )
R^2/D10^2 : 1.22115E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 167.35 using 59 PHA bins.
# Reduced chi-squared = 2.9359 for 57 degrees of freedom
# Null hypothesis probability = 8.774811e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.601e-07 4.260e-08
25- 50 2.551e-06 1.746e-07
50-150 1.088e-05 6.612e-07
15-150 1.389e-05 6.797e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.04990 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 152.46 using 59 PHA bins.
# Reduced chi-squared = 2.6747 for 57 degrees of freedom
# Null hypothesis probability = 1.212165e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.891e-06 9.630e-08
25- 50 3.637e-06 1.698e-07
50-150 7.977e-06 4.056e-07
15-150 1.350e-05 6.778e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.81607 (-1.25301 1.461)
R1^2/D10^2 : 0.272938 (-0.119836 0.240061)
kT2 [keV] : 36.1717 (-4.35781 6.50125)
R2^2/D10^2 : 2.91369E-03 (-0.0011623 0.00149428)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.80 using 59 PHA bins.
# Reduced chi-squared = 0.8691 for 55 degrees of freedom
# Null hypothesis probability = 7.436874e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.293e-06 2.598e-07
25- 50 3.136e-06 3.930e-07
50-150 1.129e-05 1.443e-06
15-150 1.572e-05 1.678e-06
Peak spectrum fit
Power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.994738 ( -0.147903 0.145464 )
Norm@50keV : 0.177852 ( -0.0152289 0.0151367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.79 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.785973e-01
Photon flux (15-150 keV) in 1 sec: 20.4728 ( -1.789 1.78817 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92687e-06 ( -1.69206e-07 1.69271e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.995333 ( -0.153632 0.142391 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 0.179014 ( -0.0150801 0.0980223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.478684e-01
Photon flux (15-150 keV) in 1 sec: 20.4791 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92759e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.843622 ( 0.843624 0.843624 )
beta : -0.994738 ( -0.145428 0.147965 )
Epeak [keV] : 43.4361 ( -43.4329 -43.4329 )
Norm@50keV : 0.287395 ( -0.124371 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.79 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 55 degrees of freedom
# Null hypothesis probability = 2.196674e-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] : 23.4531 (-2.50268 2.97324)
R^2/D10^2 : 0.610138 (-0.190698 0.26108)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.99 using 59 PHA bins.
# Reduced chi-squared = 1.579 for 57 degrees of freedom
# Null hypothesis probability = 3.481499e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.024e-08 1.059e-08
25- 50 3.304e-07 4.865e-08
50-150 1.356e-06 1.790e-07
15-150 1.747e-06 1.835e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.7467 -200)
Norm : 84.6442 (-7.38658 7.38658)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.65 using 59 PHA bins.
# Reduced chi-squared = 1.8360 for 57 degrees of freedom
# Null hypothesis probability = 1.226217e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.107e-07 2.425e-08
25- 50 4.053e-07 5.135e-08
50-150 8.889e-07 3.835e-07
15-150 1.505e-06 4.796e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.5903 (-6.68793 3.05918)
R1^2/D10^2 : 2.03037 (-1.00099 11.2999)
kT2 [keV] : 199.623 (-192.345 -199.623)
R2^2/D10^2 : 3.22399E-03 (-0.000878677 0.179582)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.79 using 59 PHA bins.
#Fit statistic : Chi-Squared = 65.70 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 55 degrees of freedom
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.512960e-01
# Null hypothesis probability = 1.530257e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.877e-08 3.055e-08
25- 50 3.867e-07 1.328e-07
50-150 1.386e-06 8.804e-07
15-150 1.872e-06 1.103e-06
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: 1.07080 ( -0.0726611 0.0717787 )
Norm@50keV : 5.15453E-02 ( -0.00219377 0.00218313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.81 using 59 PHA bins.
# Reduced chi-squared = 0.6984 for 57 degrees of freedom
# Null hypothesis probability = 9.594127e-01
Photon flux (15-150 keV) in 25.21 sec: 5.96317 ( -0.267326 0.268438 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37154e-05 ( -5.58762e-07 5.59077e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.897397 ( -0.295697 0.145874 )
Epeak [keV] : 403.006 ( -403.006 -403.006 )
Norm@50keV : 6.05409E-02 ( -0.0073958 0.0183996 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.70 using 59 PHA bins.
# Reduced chi-squared = 0.6911 for 56 degrees of freedom
# Null hypothesis probability = 9.622290e-01
Photon flux (15-150 keV) in 25.21 sec: 5.90946 ( -0.27904 0.28063 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36818e-05 ( -5.66897e-07 5.65233e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.546691 ( -2.50841 -2.50841 )
beta : -1.12343 ( -0.0944713 0.0806845 )
Epeak [keV] : 51.5836 ( -51.4715 83.2191 )
Norm@50keV : 0.539935 ( -0.55165 623.091 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.27 using 59 PHA bins.
# Reduced chi-squared = 0.6776 for 55 degrees of freedom
# Null hypothesis probability = 9.679491e-01
Photon flux (15-150 keV) in 25.21 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) = 3.10e-06
S(50-100 keV) = 5.69e-06
T90 vs. Hardness ratio plot
T90 = 129.695999979973 sec.
Hardness ratio (energy fluence ratio) = 1.83548
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.65504
Count Ratio (50-100 keV) / (15-25 keV) = 1.97024
Mask shadow pattern (with DETECTION mask)
IMX = 1.509720641894637E+00, IMY = -8.549460310624656E-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:
-677.935400 -668.876000
-239.936000 -10.248000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.8652 -62.7994 7.6 35.0 -76.8 0.8042 1.5 6.0 GX 301-2
244.9629 -15.6402 0.8 46.5 25.9 8.9276 15.1 1.0 Sco X-1
255.9811 -37.8485 0.5 22.8 34.7 5.0467 22.8 0.4 4U 1700-377
256.3410 -36.4517 3.7 24.1 36.1 0.7047 3.1 4.9 GX 349+2
263.0255 -24.9221 0.0 35.1 50.0 0.4888 1.2 10.6 GX 1+4
264.7037 -44.4669 4.2 15.5 53.0 0.5519 2.8 2.0 4U 1735-44
270.3451 -25.0236 4.4 35.2 61.5 1.1598 2.6 4.7 GX 5-1
270.0960 -25.8016 4.5 34.4 61.2 -1.0835 -2.5 11.7 GRS 1758-258
275.8665 -30.3559 4.0 30.6 71.8 1.0912 2.8 3.1 H1820-303
285.1613 -24.9186 6.0 37.9 83.7 1.3780 1.9 6.8 HT1900.1-2455
262.9671 -33.6441 0.0 26.3 49.4 0.5271 1.9 11.5 GX 354-0
305.2154 -47.6172 2.4 26.5 132.8 1.2985 4.9 ------ UNKNOWN
231.2783 -27.0135 2.2 39.9 2.8 1.6837 5.2 ------ UNKNOWN
191.6758 -36.4409 3.5 50.7 -44.6 4.2154 3.3 ------ UNKNOWN
173.0729 -61.2859 2.6 41.1 -80.9 4.7605 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-10.248000 14.964600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.8312 -62.7795 4.5 35.0 -76.7 0.3570 2.6 4.8 GX 301-2
244.8365 -15.6524 6.9 46.5 25.8 -0.4899 -1.7 8.3 Sco X-1
255.8560 -37.9427 38.5 22.7 34.4 -0.0275 -0.3 8.6 4U 1700-377
256.4457 -36.5399 27.0 24.0 36.3 0.0395 0.4 7.0 GX 349+2
263.2446 -24.7191 11.2 35.3 50.3 0.1763 1.0 12.9 GX 1+4
264.6888 -44.4711 13.4 15.5 52.9 -0.0765 -0.9 2.6 4U 1735-44
270.3565 -25.0150 4.2 35.2 61.5 -0.5334 -2.8 5.5 GX 5-1
270.1299 -25.7292 4.6 34.5 61.3 -0.4511 -2.5 9.4 GRS 1758-258
275.9251 -30.3675 584.2 30.6 71.9 0.0029 0.0 0.0 H1820-303
285.1955 -24.8908 6.3 37.9 83.7 -0.6330 -1.8 8.9 HT1900.1-2455
262.7762 -33.8838 22.9 26.1 49.1 -0.0544 -0.5 11.0 GX 354-0
257.7538 -11.9739 2.8 48.2 43.4 2.5605 4.1 ------ UNKNOWN
252.7535 -46.2811 2.3 15.3 20.3 0.3827 5.0 ------ UNKNOWN
224.4813 -11.7100 0.5 56.5 3.2 18.2891 21.7 ------ UNKNOWN
190.7758 -38.1413 2.4 49.8 -46.7 1.4263 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
96.364590 962.172500
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6448 -62.7917 37.9 57.6 -178.5 1.0580 0.3 1.3 GX 301-2
244.9756 -15.6412 0.2 20.3 85.4 40.9608 54.1 0.2 Sco X-1
254.4427 35.5197 6.3 55.1 11.8 -5.1380 -1.8 10.7 Her X-1
256.0207 -37.8131 1.5 38.4 120.3 14.9629 7.8 2.5 4U 1700-377
256.4030 -36.4510 6.0 37.9 118.2 3.6001 1.9 2.3 GX 349+2
263.0096 -24.7459 35.4 38.7 97.2 0.7028 0.3 0.0 GX 1+4
265.3601 -1.4376 2.9 41.8 60.9 9.5776 4.0 ------ UNKNOWN
242.7188 -19.5134 2.9 19.2 98.1 2.7638 4.0 ------ UNKNOWN
248.5583 35.3279 2.2 52.3 7.0 9.2183 5.2 ------ UNKNOWN
234.3733 44.9999 3.8 57.5 -9.6 9.1353 3.0 ------ UNKNOWN
199.9721 33.2718 3.7 50.7 -44.5 13.1489 3.1 ------ UNKNOWN
Plot creation:
Fri Dec 18 20:34:40 EST 2015