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
271.1751 -1.3560 0.0236 38.2076 23.3026 0.9660601 8.140 TRIG_00609885
Foreground time interval of the image:
-3.320 31.773 (delta_t = 35.093 [sec])
Background time interval of the image:
-239.928 -3.320 (delta_t = 236.608 [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 2.048000
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 2.048000
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 2.048000
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 -3.320 sec. to 31.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82580 ( -0.270711 0.281262 )
Norm@50keV : 2.00366E-03 ( -0.000330858 0.000323488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.80 using 59 PHA bins.
# Reduced chi-squared = 0.7684 for 57 degrees of freedom
# Null hypothesis probability = 9.003222e-01
Photon flux (15-150 keV) in 35.26 sec: 0.278910 ( -0.0429793 0.0431929 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49898e-07 ( -1.06867e-07 1.08373e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.320 sec. to 31.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75503 ( -1.18472 0.858636 )
Epeak [keV] : 159.416 ( -158.502 -165.668 )
Norm@50keV : 2.18719E-03 ( -0.00136811 0.00717959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7819 for 56 degrees of freedom
# Null hypothesis probability = 8.822512e-01
Photon flux (15-150 keV) in 35.26 sec: 0.278007 ( -0.044005 0.043814 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.46404e-07 ( -1.21576e-07 1.1115e-07 ) ergs/cm2
Band function
Time interval is from -3.320 sec. to 31.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.170842 ( 1.10406 6.05013 )
beta : -1.90049 ( 1.93073 0.361898 )
Epeak [keV] : 28.4428 ( -40.7817 -40.7817 )
Norm@50keV : 5.68770E-02 ( -0.0584982 232.825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.7903 for 55 degrees of freedom
# Null hypothesis probability = 8.691728e-01
Photon flux (15-150 keV) in 35.26 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] : 11.5715 (-2.11472 2.68944)
R^2/D10^2 : 7.40690E-02 (-0.0403016 0.0854692)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.36 using 59 PHA bins.
# Reduced chi-squared = 0.9888 for 57 degrees of freedom
# Null hypothesis probability = 4.989084e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.368e-08 2.200e-08
25- 50 2.220e-07 5.522e-08
50-150 1.743e-07 6.262e-08
15-150 4.700e-07 1.106e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9810 (-40.6409 -99.9847)
Norm : 1.22146 (-0.223679 0.331111)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.27 using 59 PHA bins.
# Reduced chi-squared = 0.7766 for 57 degrees of freedom
# Null hypothesis probability = 8.908970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.126e-07 2.350e-08
25- 50 1.946e-07 4.094e-08
50-150 3.154e-07 1.712e-07
15-150 6.226e-07 2.103e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.08568 (-2.57301 2.8844)
R1^2/D10^2 : 0.361479 (-0.247085 1.50409)
kT2 [keV] : 29.2124 (-12.8389 -29.3191)
R2^2/D10^2 : 1.76866E-03 (-0.00166393 0.0140203)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.69 using 59 PHA bins.
# Reduced chi-squared = 0.7944 for 55 degrees of freedom
# Null hypothesis probability = 8.638195e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.126e-07 6.153e-08
25- 50 1.976e-07 1.029e-07
50-150 3.395e-07 1.867e-07
15-150 6.497e-07 3.303e-07
Peak spectrum fit
Power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62162 ( -0.366727 0.377977 )
Norm@50keV : 8.24701E-03 ( -0.00195057 0.00193854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.38 using 59 PHA bins.
# Reduced chi-squared = 0.7083 for 57 degrees of freedom
# Null hypothesis probability = 9.532043e-01
Photon flux (15-150 keV) in 1 sec: 1.06699 ( -0.257713 0.259885 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.69337e-08 ( -1.88287e-08 1.9039e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.134568 ( -2.21459 1.52898 )
Epeak [keV] : 66.5960 ( -18.8572 2982.65 )
Norm@50keV : 4.24380E-02 ( -0.042428 0.369405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.64 using 59 PHA bins.
# Reduced chi-squared = 0.6721 for 56 degrees of freedom
# Null hypothesis probability = 9.717642e-01
Photon flux (15-150 keV) in 1 sec: 1.00456 ( -0.263942 0.26785 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31775e-08 ( -1.87422e-08 1.93651e-08 ) ergs/cm2
Band function
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.129291 ( -0.786743 3.28065 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 66.4907 ( -18.7714 245.66 )
Norm@50keV : 4.27222E-02 ( -0.04272 0.372942 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.64 using 59 PHA bins.
# Reduced chi-squared = 0.6843 for 55 degrees of freedom
# Null hypothesis probability = 9.645244e-01
Photon flux (15-150 keV) in 1 sec: 1.05048 ( 5.94952 -0.329329 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31831e-08 ( -7.31761e-08 -1.8684e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.8551 (-3.51931 4.39613)
R^2/D10^2 : 0.102997 (-0.0612305 0.150599)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.24 using 59 PHA bins.
# Reduced chi-squared = 0.6884 for 57 degrees of freedom
# Null hypothesis probability = 9.650504e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.364e-09 2.424e-09
25- 50 2.240e-08 1.060e-08
50-150 3.921e-08 1.887e-08
15-150 6.698e-08 2.753e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 173.240 (-101.171 -170.809)
Norm : 4.40772 (-1.04631 1.56131)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.11 using 59 PHA bins.
# Reduced chi-squared = 0.6861 for 57 degrees of freedom
# Null hypothesis probability = 9.662585e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.116e-08 6.375e-09
25- 50 2.111e-08 1.192e-08
50-150 4.407e-08 2.615e-08
15-150 7.634e-08 4.384e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.94292 (-5.98772 68.4756)
R1^2/D10^2 : 1.39159 (-1.38542 -1.38542)
kT2 [keV] : 19.2504 (-5.5001 159.307)
R2^2/D10^2 : 4.38820E-02 (-0.0437025 0.120308)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.00 using 59 PHA bins.
# Reduced chi-squared = 0.6726 for 55 degrees of freedom
# Null hypothesis probability = 9.702925e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.622e-09 5.760e-09
25- 50 2.173e-08 1.158e-08
50-150 4.271e-08 2.515e-08
15-150 7.406e-08 4.018e-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: 1.84341 ( -0.273854 0.285267 )
Norm@50keV : 1.97734E-03 ( -0.000333122 0.00032522 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.46 using 59 PHA bins.
# Reduced chi-squared = 0.7800 for 57 degrees of freedom
# Null hypothesis probability = 8.868575e-01
Photon flux (15-150 keV) in 35.09 sec: 0.277195 ( -0.0431133 0.0433172 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.38045e-07 ( -1.06356e-07 1.07927e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76102 ( -1.20153 0.721819 )
Epeak [keV] : 129.740 ( -140.627 -140.639 )
Norm@50keV : 2.19109E-03 ( -0.00217391 0.00745606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.44 using 59 PHA bins.
# Reduced chi-squared = 0.7937 for 56 degrees of freedom
# Null hypothesis probability = 8.672172e-01
Photon flux (15-150 keV) in 35.09 sec: 0.276214 ( -0.044691 0.043951 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.34087e-07 ( -1.21306e-07 1.11102e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.261927 ( 1.01203 1.01203 )
beta : -1.92747 ( 1.9542 0.368241 )
Epeak [keV] : 28.2277 ( -38.608 -38.608 )
Norm@50keV : 6.68411E-02 ( -0.0675893 3.20011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.05 using 59 PHA bins.
# Reduced chi-squared = 0.8009 for 55 degrees of freedom
# Null hypothesis probability = 8.550422e-01
Photon flux (15-150 keV) in 35.09 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) = 1.85e-07
S(50-100 keV) = 2.08e-07
T90 vs. Hardness ratio plot
T90 = 31.5520000457764 sec.
Hardness ratio (energy fluence ratio) = 1.12432
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.08582
Count Ratio (50-100 keV) / (15-25 keV) = 0.716165
Mask shadow pattern
IMX = 7.229298581073229E-01, IMY = -3.113819056099733E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-239.928000 -3.320000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.8463 -62.6371 32.9 48.8 -142.7 -0.2274 -0.3 9.5 GX 301-2
244.9829 -15.6356 0.2 24.9 -29.5 10.7180 51.3 0.3 Sco X-1
256.1601 -37.7975 7.8 1.6 -94.4 0.3012 1.5 8.7 4U 1700-377
256.5615 -36.4144 4.4 1.8 -44.7 0.5433 2.6 6.1 GX 349+2
263.1551 -24.5866 0.0 13.7 21.5 0.0791 0.4 12.4 GX 1+4
264.5200 -44.3176 5.2 8.2 148.3 0.4449 2.2 12.4 4U 1735-44
268.2186 -1.3102 0.0 37.5 18.6 0.2256 0.8 12.4 SW J1753.5-0127
270.2054 -25.2156 4.1 16.1 44.9 0.6119 3.0 9.2 GX 5-1
270.2914 -25.7174 2.5 15.7 46.2 1.1888 5.9 1.7 GRS 1758-258
274.0212 -14.0358 1.4 27.5 37.0 2.1352 8.4 0.9 GX 17+2
276.0171 -30.3704 4.5 16.5 71.0 0.6185 2.6 4.8 H1820-303
285.1102 -24.9827 7.5 26.1 70.8 0.4917 1.5 5.5 HT1900.1-2455
263.1421 -33.8343 2.7 5.6 50.2 0.9069 4.3 7.6 GX 354-0
262.8872 -1.2749 2.7 36.6 9.9 1.1731 4.3 ------ UNKNOWN
224.0738 2.2309 3.4 50.8 -44.3 3.7459 3.4 ------ UNKNOWN
212.9280 -23.2788 2.0 41.1 -80.9 5.2480 5.9 ------ UNKNOWN
219.9854 -7.2574 3.1 46.0 -56.5 3.9976 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-3.320000 31.772590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6607 -62.8139 7.3 48.9 -142.9 0.2852 1.6 2.6 GX 301-2
244.9447 -15.6131 6.2 24.9 -29.5 -0.1377 -1.9 2.6 Sco X-1
256.0553 -37.6936 7.6 1.7 -90.6 -0.0918 -1.5 9.6 4U 1700-377
256.2496 -36.4550 17.1 1.9 -50.8 -0.0402 -0.7 9.2 GX 349+2
263.1508 -24.8864 5.5 13.4 21.8 0.1326 2.1 11.4 GX 1+4
264.7319 -44.3004 6.7 8.3 147.4 -0.1088 -1.7 9.0 4U 1735-44
268.2972 -1.4146 8.7 37.4 18.8 0.1437 1.3 4.8 SW J1753.5-0127
270.1236 -25.1008 17.0 16.1 44.4 -0.0487 -0.7 8.8 GX 5-1
270.4719 -25.8421 89.6 15.7 47.0 0.0091 0.1 10.9 GRS 1758-258
273.9328 -14.1884 4.5 27.3 37.0 -0.2058 -2.6 10.1 GX 17+2
276.0999 -30.3571 8.9 16.5 71.1 -0.0924 -1.3 9.1 H1820-303
284.8672 -24.9294 82.3 26.0 70.4 0.0128 0.1 9.2 HT1900.1-2455
263.0599 -33.6799 7.5 5.6 48.6 -0.0951 -1.5 9.9 GX 354-0
271.1752 -1.3560 1.4 38.2 23.3 0.9653 8.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
93.172590 962.171200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9841 -15.6419 0.3 29.5 -134.7 31.7680 39.0 0.3 Sco X-1
254.4437 35.3688 2.9 39.9 -35.8 3.8617 4.0 1.7 Her X-1
256.1003 -37.9443 9.5 39.1 -175.4 1.0429 1.2 8.1 4U 1700-377
256.6319 -36.3219 0.0 37.5 -174.9 0.7656 0.9 11.3 GX 349+2
262.8818 -24.8677 15.8 24.8 -176.2 0.4176 0.7 10.1 GX 1+4
264.6653 -44.3404 4.1 43.4 172.4 -3.0739 -2.8 7.4 4U 1735-44
268.4857 -1.4937 4.4 2.7 -107.3 1.3623 2.6 7.5 SW J1753.5-0127
270.2991 -25.0920 3.4 23.7 167.6 2.1833 3.4 1.1 GX 5-1
270.2713 -25.7528 3.9 24.4 167.6 1.8583 3.0 1.8 GRS 1758-258
274.0056 -14.0202 0.9 13.0 153.2 6.4930 12.5 1.0 GX 17+2
275.9112 -30.3691 7.3 29.4 157.3 1.2048 1.6 0.7 H1820-303
285.0059 -25.0607 6.6 27.2 137.4 1.3491 1.8 8.6 HT1900.1-2455
288.7821 10.9502 0.6 21.4 40.2 11.8410 18.8 1.0 GRS 1915+105
299.6542 35.2001 2.6 45.2 19.0 5.7135 4.5 3.1 Cyg X-1
308.1082 40.9538 40.1 54.0 19.8 1.0799 0.3 0.1 Cyg X-3
262.9507 -33.8935 4.6 33.4 178.1 1.7258 2.5 4.0 GX 354-0
294.3553 -36.0184 2.5 40.8 136.5 6.3414 4.6 ------ UNKNOWN
300.2434 25.1251 3.6 38.7 30.5 3.2446 3.2 ------ UNKNOWN
281.3026 18.9931 2.5 22.7 11.3 2.3832 4.6 ------ UNKNOWN
267.9598 -26.3513 2.5 25.2 172.4 2.8222 4.6 ------ UNKNOWN
290.9669 51.3911 2.4 55.4 0.6 11.0561 4.8 ------ UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Sat May 30 12:47:09 EDT 2015