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
311.5048 -62.7061 0.0039 33.0113 -65.3898 17.6987770 49.919 TRIG_00637044
Foreground time interval of the image:
-83.148 11.093 (delta_t = 94.241 [sec])
Background time interval of the image:
-239.208 -83.148 (delta_t = 156.060 [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 -83.148 sec. to 145.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22092 ( -0.0380099 0.0378419 )
Norm@50keV : 7.39697E-03 ( -0.000151855 0.000151481 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.87 using 59 PHA bins.
# Reduced chi-squared = 0.6994 for 57 degrees of freedom
# Null hypothesis probability = 9.588245e-01
Photon flux (15-150 keV) in 228.5 sec: 0.870895 ( -0.0197727 0.0198338 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70483e-05 ( -3.45024e-07 3.45177e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -83.148 sec. to 145.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09707 ( -0.154277 0.136481 )
Epeak [keV] : 444.787 ( -210.667 -444.866 )
Norm@50keV : 8.31966E-03 ( -0.00067897 0.00127368 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.88 using 59 PHA bins.
# Reduced chi-squared = 0.6764 for 56 degrees of freedom
# Null hypothesis probability = 9.697680e-01
Photon flux (15-150 keV) in 228.5 sec: 0.862760 ( -0.021818 0.021953 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69633e-05 ( -3.64777e-07 3.63338e-07 ) ergs/cm2
Band function
Time interval is from -83.148 sec. to 145.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.770644 ( 0.771729 5.50909 )
beta : -1.25255 ( 1.25264 0.0551666 )
Epeak [keV] : 105.313 ( -106.072 -106.072 )
Norm@50keV : 1.33267E-02 ( -0.00557671 353.237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.86 using 59 PHA bins.
# Reduced chi-squared = 0.6883 for 55 degrees of freedom
# Null hypothesis probability = 9.623625e-01
Photon flux (15-150 keV) in 228.5 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] : 21.4596 ( )
R^2/D10^2 : 3.08228E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 472.87 using 59 PHA bins.
# Reduced chi-squared = 8.2960 for 57 degrees of freedom
# Null hypothesis probability = 7.749006e-67
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.070e-07 2.731e-08
25- 50 3.162e-06 9.369e-08
50-150 1.087e-05 3.302e-07
15-150 1.464e-05 3.485e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.79493 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 309.08 using 59 PHA bins.
# Reduced chi-squared = 5.4224 for 57 degrees of freedom
# Null hypothesis probability = 2.566269e-36
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.159e-06 4.936e-08
25- 50 4.154e-06 9.940e-08
50-150 9.110e-06 2.136e-07
15-150 1.542e-05 3.679e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.40972 (-0.730907 0.790961)
R1^2/D10^2 : 0.393713 (-0.0983173 0.139911)
kT2 [keV] : 33.7586 (-2.48124 3.16804)
R2^2/D10^2 : 5.98789E-03 (-0.00152963 0.00175882)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.61 using 59 PHA bins.
# Reduced chi-squared = 0.7929 for 55 degrees of freedom
# Null hypothesis probability = 8.657994e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.417e-06 1.170e-07
25- 50 3.729e-06 1.759e-07
50-150 1.182e-05 5.381e-07
15-150 1.697e-05 6.649e-07
Peak spectrum fit
Power-law model
Time interval is from 5.804 sec. to 6.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.917571 ( -0.0600957 0.0596312 )
Norm@50keV : 0.153214 ( -0.00521846 0.0052054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.96 using 59 PHA bins.
# Reduced chi-squared = 0.8940 for 57 degrees of freedom
# Null hypothesis probability = 6.999014e-01
Photon flux (15-150 keV) in 1 sec: 17.5893 ( -0.601601 0.602011 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70788e-06 ( -6.27989e-08 6.29084e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.804 sec. to 6.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.745714 ( -0.237456 0.196105 )
Epeak [keV] : 432.987 ( -432.987 -432.987 )
Norm@50keV : 0.181846 ( -0.0305712 0.0468526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.28 using 59 PHA bins.
# Reduced chi-squared = 0.8799 for 56 degrees of freedom
# Null hypothesis probability = 7.254437e-01
Photon flux (15-150 keV) in 1 sec: 17.4732 ( -0.6193 0.6196 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69746e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 5.804 sec. to 6.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99997 ( -14.9997 -4.99997 )
beta : -0.962352 ( -0.065745 0.0654905 )
Epeak [keV] : 28.5911 ( -10.6387 3.66007 )
Norm@50keV : 4419.35 ( -146.822 13611.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.02 using 59 PHA bins.
# Reduced chi-squared = 0.8549 for 55 degrees of freedom
# Null hypothesis probability = 7.693829e-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] : 23.6901 ( )
R^2/D10^2 : 0.511345 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 186.72 using 59 PHA bins.
# Reduced chi-squared = 3.2757 for 57 degrees of freedom
# Null hypothesis probability = 1.057634e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.126e-08 3.625e-09
25- 50 2.827e-07 1.520e-08
50-150 1.183e-06 6.250e-08
15-150 1.517e-06 6.150e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 70.0129 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 346.01 using 59 PHA bins.
# Reduced chi-squared = 6.0703 for 57 degrees of freedom
# Null hypothesis probability = 5.347483e-43
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.743e-07 6.950e-09
25- 50 3.354e-07 1.210e-08
50-150 7.355e-07 2.620e-08
15-150 1.245e-06 4.300e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.81218 (-1.25709 1.48094)
R1^2/D10^2 : 5.59752 (-1.99181 3.3416)
kT2 [keV] : 38.1926 (-4.63868 7.18154)
R2^2/D10^2 : 0.105253 (-0.0419491 0.0516935)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.38 using 59 PHA bins.
# Reduced chi-squared = 0.8432 for 55 degrees of freedom
# Null hypothesis probability = 7.895821e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.042e-07 1.338e-08
25- 50 3.097e-07 2.960e-08
50-150 1.303e-06 1.345e-07
15-150 1.717e-06 1.695e-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: 1.11472 ( -0.0397778 0.0395374 )
Norm@50keV : 1.33187E-02 ( -0.000293119 0.000292462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.95 using 59 PHA bins.
# Reduced chi-squared = 0.7886 for 57 degrees of freedom
# Null hypothesis probability = 8.761922e-01
Photon flux (15-150 keV) in 94.24 sec: 1.54715 ( -0.0365107 0.0366136 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30619e-05 ( -2.80128e-07 2.80187e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.966386 ( -0.162263 0.0801674 )
Epeak [keV] : 430.600 ( -190.598 -430.6 )
Norm@50keV : 1.53097E-02 ( -0.0014761 0.00244493 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.35 using 59 PHA bins.
# Reduced chi-squared = 0.7563 for 56 degrees of freedom
# Null hypothesis probability = 9.111937e-01
Photon flux (15-150 keV) in 94.24 sec: 1.53185 ( -0.03953 0.0397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29947e-05 ( -2.92615e-07 2.91579e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.353101 ( -0.554782 3.53562 )
beta : -1.15654 ( 1.15661 0.0563942 )
Epeak [keV] : 79.6769 ( -41.8962 180.266 )
Norm@50keV : 3.71392E-02 ( -0.0189462 2.00624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.31 using 59 PHA bins.
# Reduced chi-squared = 0.7510 for 55 degrees of freedom
# Null hypothesis probability = 9.143471e-01
Photon flux (15-150 keV) in 94.24 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) = 3.63e-06
S(50-100 keV) = 6.22e-06
T90 vs. Hardness ratio plot
T90 = 37.2959999442101 sec.
Hardness ratio (energy fluence ratio) = 1.7135
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.61816
Count Ratio (50-100 keV) / (15-25 keV) = 1.58023
Mask shadow pattern
IMX = 2.705571048557010E-01, IMY = 5.906714449798098E-01
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:
-239.208000 -83.148000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3996 -60.6554 5.6 47.0 20.6 0.9953 2.1 3.1 Cen X-3
186.5879 -62.8636 4.3 39.1 21.3 0.7570 2.7 5.9 GX 301-2
244.9782 -15.6461 0.8 34.3 140.1 4.9242 15.0 0.4 Sco X-1
255.9541 -37.9895 24.3 10.8 159.6 0.0859 0.5 8.9 4U 1700-377
256.3474 -36.4980 3.3 12.3 161.0 0.6212 3.4 6.2 GX 349+2
263.1836 -24.6406 6.5 24.9 175.0 0.3402 1.8 11.4 GX 1+4
264.9148 -44.5724 4.0 7.6 -141.8 0.4762 2.9 10.4 4U 1735-44
268.3792 -1.3330 4.2 48.7 175.6 -1.2346 -2.8 7.2 SW J1753.5-0127
270.1912 -25.0770 4.0 26.3 -170.6 0.5350 2.9 5.1 GX 5-1
270.2884 -25.7419 3.8 25.7 -169.9 0.5678 3.1 0.8 GRS 1758-258
273.9017 -13.9146 11.5 38.0 -171.8 0.2629 1.0 9.5 GX 17+2
275.7466 -30.4894 0.0 23.8 -154.3 -0.4024 -2.1 11.8 H1820-303
284.9746 -24.9085 5.9 33.0 -147.0 0.4642 1.9 3.4 HT1900.1-2455
262.9313 -33.7763 2.4 15.9 -179.1 0.8254 4.9 4.5 GX 354-0
242.0143 -53.0602 2.4 9.6 37.2 0.8502 4.9 ------ UNKNOWN
261.6004 -30.8841 3.2 18.5 174.8 0.6150 3.7 ------ UNKNOWN
290.7647 0.1900 3.3 57.5 -158.4 3.6044 3.5 ------ UNKNOWN
348.6722 -67.1625 3.0 47.1 -53.2 3.9670 3.8 ------ UNKNOWN
303.1512 -15.8521 2.8 50.6 -134.9 4.1459 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-83.148000 11.092590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0719 -60.6711 6.1 47.1 20.5 -0.8542 -1.9 7.7 Cen X-3
186.3559 -62.8891 4.7 39.2 21.2 -0.7449 -2.4 10.9 GX 301-2
244.9798 -15.6397 32.8 34.3 140.1 0.1055 0.4 0.0 Sco X-1
255.8440 -37.8768 58.1 10.9 159.1 0.0420 0.2 7.0 4U 1700-377
256.6333 -36.4185 14.4 12.4 162.0 0.1665 0.8 9.6 GX 349+2
262.8532 -24.7407 13.2 24.7 174.3 0.1901 0.9 8.5 GX 1+4
264.8289 -44.3117 8.6 7.7 -143.6 0.2501 1.3 9.1 4U 1735-44
268.4045 -1.3837 5.1 48.6 175.7 1.1036 2.3 4.7 SW J1753.5-0127
270.2098 -24.9096 19.2 26.4 -170.7 -0.1305 -0.6 11.0 GX 5-1
270.2630 -25.6504 5.1 25.8 -170.0 -0.4877 -2.2 6.0 GRS 1758-258
274.1499 -13.9153 0.0 38.0 -171.5 -0.3732 -1.3 11.1 GX 17+2
276.0245 -30.5144 8.5 23.9 -153.8 -0.2590 -1.4 10.2 H1820-303
285.1431 -25.0777 4.7 33.0 -146.6 -0.6082 -2.4 11.1 HT1900.1-2455
262.9814 -33.8425 532.2 15.9 -178.8 0.0041 0.0 0.6 GX 354-0
190.5119 -42.7335 3.0 44.5 50.8 3.2617 3.9 ------ UNKNOWN
224.9827 -23.3560 3.6 35.1 104.0 1.3967 3.3 ------ UNKNOWN
142.8708 -69.9080 3.6 51.8 2.5 1.8176 3.2 ------ UNKNOWN
138.1823 -76.8596 2.9 48.4 -5.7 1.4576 4.0 ------ UNKNOWN
311.5048 -62.7061 0.2 33.0 -65.4 17.6984 49.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
64.092590 962.891600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
255.9899 -37.8516 15.0 41.4 128.6 -1.7222 -0.8 0.5 4U 1700-377
256.2194 -36.4801 11.8 42.4 130.0 -2.4056 -1.0 11.0 GX 349+2
262.9920 -24.7409 47.1 49.6 145.2 -0.8920 -0.2 1.0 GX 1+4
264.7440 -44.4151 10.1 32.2 130.8 1.1370 1.1 2.1 4U 1735-44
270.2022 -24.9438 11.8 46.6 153.0 2.4036 1.0 9.3 GX 5-1
270.1770 -25.7186 6.1 45.9 152.6 4.3146 1.9 6.9 GRS 1758-258
275.8331 -30.4468 9.6 39.5 156.3 -1.5558 -1.2 6.8 H1820-303
285.0928 -24.8649 8.4 41.7 171.2 1.4137 1.4 4.5 HT1900.1-2455
262.9054 -33.8460 28.0 41.7 139.0 0.8053 0.4 4.2 GX 354-0
291.0097 -47.4928 3.1 19.0 162.0 2.1507 3.8 ------ UNKNOWN
311.3659 -62.6182 2.2 0.1 -178.0 3.0625 5.4 ------ UNKNOWN
67.3895 -58.0547 2.4 49.6 -10.2 6.0657 4.7 ------ UNKNOWN
317.5293 -8.4681 4.2 54.4 -144.2 13.3173 2.7 ------ UNKNOWN
34.7504 -41.7735 4.2 50.8 -44.5 11.5840 2.8 ------ UNKNOWN
14.1698 -38.9699 3.7 43.7 -63.9 11.7641 3.1 ------ UNKNOWN
324.6175 -12.9651 2.3 50.6 -134.9 20.0308 5.1 ------ UNKNOWN
Plot creation:
Thu May 28 13:02:17 EDT 2015