Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
253.4476 34.1631 0.0147 38.7182 119.5005 3.7300498 13.042 TRIG_00631051
Foreground time interval of the image:
4.000 72.901 (delta_t = 68.901 [sec])
Background time interval of the image:
-463.499 -447.733 (delta_t = 15.766 [sec])
-239.000 4.000 (delta_t = 243.000 [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 64.000000
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 64.000000
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 64.000000
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 4.000 sec. to 291.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74370 ( -0.147091 0.149564 )
Norm@50keV : 1.21036E-03 ( -0.000115319 0.000114355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.93 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.954873e-01
Photon flux (15-150 keV) in 287 sec: 0.163283 ( -0.0146667 0.0146852 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20656e-06 ( -3.14239e-07 3.17212e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.000 sec. to 291.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.642495 ( -0.944664 0.734674 )
Epeak [keV] : 53.5753 ( -9.16207 25.106 )
Norm@50keV : 5.01459E-03 ( -0.0030534 0.0123877 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.70 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.766434e-01
Photon flux (15-150 keV) in 287 sec: 0.156917 ( -0.015306 0.015279 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89095e-06 ( -3.67983e-07 3.77835e-07 ) ergs/cm2
Band function
Time interval is from 4.000 sec. to 291.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.45417 ( -4.54949 -4.45417 )
beta : -2.22802 ( -0.298677 0.253806 )
Epeak [keV] : 32.0475 ( -3.23027 3.24272 )
Norm@50keV : 16.1408 ( -1.39066 77.823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.30 using 59 PHA bins.
# Reduced chi-squared = 0.9328 for 55 degrees of freedom
# Null hypothesis probability = 6.166646e-01
Photon flux (15-150 keV) in 287 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98842e-06 ( -2.98641e-06 -3.2689e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2763 (-1.03553 1.17564)
R^2/D10^2 : 5.11506E-02 (-0.0161309 0.022639)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.06 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.147005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.918e-07 6.257e-08
25- 50 1.143e-06 1.279e-07
50-150 8.367e-07 1.739e-07
15-150 2.372e-06 2.483e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9206 (-23.8452 55.3762)
Norm : 0.731458 (-0.0939969 0.0906947)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.461153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.487e-07 7.677e-08
25- 50 9.486e-07 1.017e-07
50-150 1.537e-06 5.779e-07
15-150 3.034e-06 5.815e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.73514 (-1.53554 1.50367)
R1^2/D10^2 : 0.108126 (-0.0383119 0.102542)
kT2 [keV] : 34.1643 (-18.2471 -40.9684)
R2^2/D10^2 : 4.66123E-04 (-0.000250289 0.00146552)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.9201 for 55 degrees of freedom
# Null hypothesis probability = 6.431243e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.760e-07 1.456e-07
25- 50 1.065e-06 3.044e-07
50-150 1.449e-06 7.545e-07
15-150 2.990e-06 9.594e-07
Peak spectrum fit
Power-law model
Time interval is from 18.000 sec. to 19.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.03850 ( -0.941901 1.3188 )
Norm@50keV : 3.63091E-03 ( -0.00269752 0.00357028 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.99 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.727227e-01
Photon flux (15-150 keV) in 1 sec: 1.02699 ( -0.413108 0.415303 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44143e-08 ( -2.09505e-08 2.54287e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.000 sec. to 19.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.77842E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.79 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 56 degrees of freedom
# Null hypothesis probability = 1.171336e-01
Photon flux (15-150 keV) in 1 sec: 0.946047 ( -0.366121 0.422623 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21549e-08 ( -1.26798e-08 2.95824e-08 ) ergs/cm2
Band function
Time interval is from 18.000 sec. to 19.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93857 ( -4.93857 -4.93857 )
beta : -4.86781 ( 4.86781 2.44285 )
Epeak [keV] : 19.8205 ( -19.8205 6.19999 )
Norm@50keV : 7613.41 ( -2897.09 5.45116e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.39 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.578139e-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] : 4.79696 (-1.52181 2.39385)
R^2/D10^2 : 10.7929 (-10.7929 63.8485)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.080241e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.217e-08 1.374e-08
25- 50 1.305e-08 9.965e-09
50-150 4.325e-10 4.676e-10
15-150 3.566e-08 2.227e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.7593 (-7.63055 22.2277)
Norm : 18.7513 (-18.7515 49.7012)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.35 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.918940e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.137e-08 1.365e-08
25- 50 1.434e-08 9.585e-09
50-150 2.445e-09 2.579e-09
15-150 3.816e-08 2.419e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 197.839 ( )
R1^2/D10^2 : 1.04777E-04 (-9.80572e-05 0.00343254)
kT2 [keV] : 4.65523 (-1.45987 1.5267)
R2^2/D10^2 : 12.1451 (-10.154 55.9558)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.81 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.73 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 55 degrees of freedom
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Null hypothesis probability = 2.459907e-01
# Null hypothesis probability = 3.403439e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.214e-08 1.021e-07
25- 50 1.335e-08 2.284e-07
50-150 8.577e-10 7.050e-08
15-150 3.634e-08 2.921e-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: 1.58325 ( -0.193247 0.193898 )
Norm@50keV : 3.26697E-03 ( -0.000385694 0.000384196 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.32 using 59 PHA bins.
# Reduced chi-squared = 0.9178 for 57 degrees of freedom
# Null hypothesis probability = 6.511678e-01
Photon flux (15-150 keV) in 68.9 sec: 0.417674 ( -0.0502589 0.0504287 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10952e-06 ( -2.62789e-07 2.64779e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.794562 ( -1.05795 0.827371 )
Epeak [keV] : 73.0216 ( -20.0469 -73.0266 )
Norm@50keV : 8.47034E-03 ( -0.00527759 0.0219218 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.72 using 59 PHA bins.
# Reduced chi-squared = 0.8879 for 56 degrees of freedom
# Null hypothesis probability = 7.099725e-01
Photon flux (15-150 keV) in 68.9 sec: 0.405225 ( -0.052122 0.052168 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98545e-06 ( -3.00259e-07 2.9893e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.12486 ( -4.81004 -4.12485 )
beta : -1.95891 ( -0.417676 0.320911 )
Epeak [keV] : 33.7623 ( -6.09536 18.7308 )
Norm@50keV : 17.8945 ( -17.8827 12.994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.50 using 59 PHA bins.
# Reduced chi-squared = 0.8273 for 55 degrees of freedom
# Null hypothesis probability = 8.156433e-01
Photon flux (15-150 keV) in 68.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00261e-06 ( -2.00213e-06 -2.71149e-07 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 8.84e-07
S(50-100 keV) = 1.06e-06
T90 vs. Hardness ratio plot
T90 = 209 sec.
Hardness ratio (energy fluence ratio) = 1.1991
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.63949
Count Ratio (50-100 keV) / (15-25 keV) = 0.804529
Mask shadow pattern
IMX = -3.947685319726116E-01, IMY = -6.977378766001685E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-463.499400 -447.732900
-239.000000 4.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9985 -15.6596 1.2 46.1 41.7 6.6532 9.3 1.6 Sco X-1
254.5092 35.3948 4.2 38.7 121.9 1.6944 2.8 4.0 Her X-1
256.0040 -37.8568 1.6 53.4 11.2 5.7547 7.0 1.1 4U 1700-377
256.3895 -36.4260 4.2 52.0 11.9 2.0749 2.8 2.2 GX 349+2
262.9827 -24.7640 63.9 39.3 15.1 0.0575 0.2 1.8 GX 1+4
264.7163 -44.3314 6.8 55.6 0.2 1.4953 1.7 7.2 4U 1735-44
268.3891 -1.4371 3.6 19.0 43.0 0.6562 3.1 1.6 SW J1753.5-0127
270.3359 -25.0757 6.2 36.2 5.4 0.5417 1.8 2.8 GX 5-1
270.4063 -25.7213 3.7 36.7 4.9 0.9046 3.1 5.8 GRS 1758-258
274.0254 -14.1147 2.7 24.8 8.5 0.8568 4.2 4.8 GX 17+2
275.9629 -30.3661 3.6 39.5 -5.1 0.9138 3.2 2.0 H1820-303
284.9334 -24.8027 5.5 33.1 -17.4 0.5100 2.1 9.0 HT1900.1-2455
288.8097 10.9233 1.0 4.8 -141.1 2.2904 11.8 1.5 GRS 1915+105
299.5700 35.2050 1.2 30.2 -172.5 2.0818 9.6 1.0 Cyg X-1
308.1064 40.9546 3.9 38.7 -168.5 0.8608 3.0 0.2 Cyg X-3
326.2487 38.1812 56.7 47.8 -152.4 -0.0974 -0.2 9.2 Cyg X-2
262.9952 -33.8497 6.4 46.9 7.9 0.7607 1.8 1.0 GX 354-0
249.1237 -14.8876 2.6 42.2 39.8 2.1580 4.5 ------ UNKNOWN
305.5889 63.0902 2.4 56.9 174.0 6.2109 4.9 ------ UNKNOWN
277.3834 -23.7898 2.0 32.8 -4.6 1.3989 5.7 ------ UNKNOWN
283.5763 -49.4661 2.6 57.7 -16.2 3.9122 4.4 ------ UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
4.000000 72.900600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0957 -15.7382 7.7 46.0 41.5 -0.5539 -1.5 8.9 Sco X-1
254.6260 35.4124 5.0 38.7 122.0 -0.6364 -2.3 9.2 Her X-1
255.9823 -37.9220 53.8 53.4 11.2 -0.0909 -0.2 4.7 4U 1700-377
256.5290 -36.5010 7.0 52.0 11.8 0.5969 1.6 6.5 GX 349+2
262.9829 -24.6609 4.4 39.2 15.2 0.4230 2.6 5.3 GX 1+4
264.8555 -44.4772 6.2 55.7 0.0 0.7913 1.8 5.1 4U 1735-44
268.5024 -1.5146 15.7 18.9 42.6 0.0776 0.7 8.9 SW J1753.5-0127
270.4488 -25.0130 5.6 36.1 5.3 -0.2572 -2.0 9.8 GX 5-1
270.3404 -25.7637 9.4 36.8 4.9 0.1614 1.2 2.4 GRS 1758-258
274.0593 -14.0226 45.1 24.7 8.5 0.0253 0.3 3.2 GX 17+2
275.7478 -30.4457 6.4 39.7 -4.9 0.2429 1.8 10.3 H1820-303
284.9018 -25.0421 4.4 33.3 -17.3 0.3024 2.6 10.3 HT1900.1-2455
288.9249 10.8424 6.5 4.9 -139.6 -0.1568 -1.8 9.7 GRS 1915+105
299.7035 35.0819 5.4 30.1 -172.2 -0.2189 -2.1 9.1 Cyg X-1
308.2632 40.9206 11.1 38.8 -168.3 -0.1284 -1.0 7.2 Cyg X-3
326.1567 38.3361 2700.0 47.8 -152.7 0.0002 0.0 1.1 Cyg X-2
263.1532 -33.7332 11.1 46.7 7.8 0.2189 1.0 10.2 GX 354-0
253.4477 34.1630 0.9 38.7 119.5 3.7293 13.0 ------ UNKNOWN
264.0282 -32.5575 2.0 45.3 7.7 1.0528 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
132.500600 533.000590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9777 -15.6358 0.7 50.5 -9.3 8.9817 16.8 0.3 Sco X-1
254.4326 35.3264 1.2 1.4 -164.9 2.2631 9.8 1.6 Her X-1
268.2566 -1.4467 4.7 38.2 -44.3 0.9342 2.5 6.7 SW J1753.5-0127
288.7086 10.8981 3.0 39.7 -82.5 3.4297 3.9 6.0 GRS 1915+105
299.5953 35.2279 1.5 37.6 -125.1 3.3514 8.0 1.6 Cyg X-1
308.1185 40.9590 14.2 43.2 -135.7 0.4182 0.8 0.5 Cyg X-3
224.8332 63.7427 2.5 34.4 138.1 1.7711 4.6 ------ UNKNOWN
262.9803 58.4323 3.3 25.1 171.9 0.9261 3.5 ------ UNKNOWN
255.6443 -13.1452 2.4 47.4 -22.8 2.2420 4.8 ------ UNKNOWN
Plot creation:
Thu May 28 13:26:46 EDT 2015