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
288.8199 -1.5935 0.0126 35.9570 37.1032 1.1937008 15.274 TRIG_00536172
Foreground time interval of the image:
-2.716 2.564 (delta_t = 5.280 [sec])
Background time interval of the image:
-187.755 -2.716 (delta_t = 185.039 [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 0.512000
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 0.512000
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 0.512000
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)
The mask-weighted light curves based on cleaned DPHs
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 -2.716 sec. to 2.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74616 ( -0.169493 0.174387 )
Norm@50keV : 1.34538E-02 ( -0.00144954 0.00142769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.57 using 59 PHA bins.
# Reduced chi-squared = 0.7644 for 57 degrees of freedom
# Null hypothesis probability = 9.047036e-01
Photon flux (15-150 keV) in 5.28 sec: 1.81662 ( -0.174825 0.174946 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.55628e-07 ( -7.27299e-08 7.376e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.716 sec. to 2.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28865 ( -0.814573 0.578178 )
Epeak [keV] : 69.9120 ( -22.1813 -69.9124 )
Norm@50keV : 2.40080E-02 ( -0.0114196 0.0429741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.30 using 59 PHA bins.
# Reduced chi-squared = 0.7553 for 56 degrees of freedom
# Null hypothesis probability = 9.121553e-01
Photon flux (15-150 keV) in 5.28 sec: 1.78232 ( -0.18238 0.17964 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.27158e-07 ( -8.33659e-08 8.50766e-08 ) ergs/cm2
Band function
Time interval is from -2.716 sec. to 2.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.843909 ( 0.835221 0.835221 )
beta : -2.01640 ( 2.01827 0.371284 )
Epeak [keV] : 49.0872 ( -48.0032 573.829 )
Norm@50keV : 4.65499E-02 ( -0.0505452 1303.52 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7586 for 55 degrees of freedom
# Null hypothesis probability = 9.065708e-01
Photon flux (15-150 keV) in 5.28 sec: 1.77954 ( 5.22046 -0.18093 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31372e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7138 (-1.25212 1.43626)
R^2/D10^2 : 0.482442 (-0.16952 0.252696)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.56 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.855644e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.375e-08 1.296e-08
25- 50 2.255e-07 2.835e-08
50-150 1.830e-07 4.240e-08
15-150 4.823e-07 6.125e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 113.447 (-36.2275 66.4122)
Norm : 7.80325 (-0.932662 1.18783)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7417 for 57 degrees of freedom
# Null hypothesis probability = 9.272305e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-07 1.536e-08
25- 50 1.904e-07 2.648e-08
50-150 3.304e-07 1.433e-07
15-150 6.284e-07 1.587e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.36999 (-2.28686 2.06723)
R1^2/D10^2 : 1.86434 (-0.958524 3.98714)
kT2 [keV] : 25.6859 (-9.14656 28.7278)
R2^2/D10^2 : 1.78125E-02 (-0.0149248 0.0352391)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.52 using 59 PHA bins.
# Reduced chi-squared = 0.7730 for 55 degrees of freedom
# Null hypothesis probability = 8.905625e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.010e-07 4.634e-08
25- 50 1.975e-07 8.809e-08
50-150 3.247e-07 1.750e-07
15-150 6.232e-07 2.884e-07
Peak spectrum fit
Power-law model
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65991 ( -0.210452 0.217744 )
Norm@50keV : 2.49970E-02 ( -0.00342977 0.00338243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.92 using 59 PHA bins.
# Reduced chi-squared = 0.8231 for 57 degrees of freedom
# Null hypothesis probability = 8.272306e-01
Photon flux (15-150 keV) in 1 sec: 3.27474 ( -0.417494 0.417878 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32256e-07 ( -3.34187e-08 3.38994e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.687235 ( -1.09718 0.892176 )
Epeak [keV] : 64.5383 ( -15.0997 142.939 )
Norm@50keV : 8.08913E-02 ( -0.0808896 0.214798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.41 using 59 PHA bins.
# Reduced chi-squared = 0.7752 for 56 degrees of freedom
# Null hypothesis probability = 8.902932e-01
Photon flux (15-150 keV) in 1 sec: 3.16449 ( -0.43023 0.43014 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17913e-07 ( -3.4589e-08 3.6023e-08 ) ergs/cm2
Band function
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.686697 ( -0.53346 1.49171 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 64.5083 ( -15.0805 143.985 )
Norm@50keV : 8.09529E-02 ( -0.0513852 0.214853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.41 using 59 PHA bins.
# Reduced chi-squared = 0.7893 for 55 degrees of freedom
# Null hypothesis probability = 8.705038e-01
Photon flux (15-150 keV) in 1 sec: 3.19933 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1887e-07 ( -2.18863e-07 -3.5746e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.6295 (-1.82362 2.13547)
R^2/D10^2 : 0.525787 (-0.217031 0.359494)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.03 using 59 PHA bins.
# Reduced chi-squared = 0.9129 for 57 degrees of freedom
# Null hypothesis probability = 6.614260e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.068e-08 4.800e-09
25- 50 7.485e-08 1.268e-08
50-150 9.027e-08 2.318e-08
15-150 1.858e-07 3.285e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 143.489 (-56.6167 -139.566)
Norm : 13.5952 (-1.91505 2.45312)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7827 for 57 degrees of freedom
# Null hypothesis probability = 8.836010e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.504e-08 1.580e-08
25- 50 6.453e-08 2.453e-08
50-150 1.250e-07 7.461e-08
15-150 2.246e-07 1.075e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.19614 (-3.08037 3.54959)
R1^2/D10^2 : 8.18673 (-6.76805 848.496)
kT2 [keV] : 17.9761 (-3.90843 7.5346)
R2^2/D10^2 : 0.162267 (-0.125477 0.278264)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.56 using 59 PHA bins.
# Reduced chi-squared = 0.7738 for 55 degrees of freedom
# Null hypothesis probability = 8.896968e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.367e-08 1.836e-08
25- 50 6.514e-08 3.219e-08
50-150 1.146e-07 6.491e-08
15-150 2.134e-07 1.098e-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: 1.74616 ( -0.169493 0.174387 )
Norm@50keV : 1.34538E-02 ( -0.00144954 0.00142769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.57 using 59 PHA bins.
# Reduced chi-squared = 0.7644 for 57 degrees of freedom
# Null hypothesis probability = 9.047036e-01
Photon flux (15-150 keV) in 5.28 sec: 1.81662 ( -0.174825 0.174946 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.55628e-07 ( -7.27299e-08 7.376e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28865 ( -0.814573 0.578178 )
Epeak [keV] : 69.9120 ( -22.1813 -69.9124 )
Norm@50keV : 2.40080E-02 ( -0.0114196 0.0429741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.30 using 59 PHA bins.
# Reduced chi-squared = 0.7553 for 56 degrees of freedom
# Null hypothesis probability = 9.121553e-01
Photon flux (15-150 keV) in 5.28 sec: 1.78232 ( -0.18238 0.17965 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.27158e-07 ( -8.33659e-08 8.50766e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.843909 ( 0.835221 0.835221 )
beta : -2.01640 ( 2.01827 0.371284 )
Epeak [keV] : 49.0872 ( -48.0032 548.91 )
Norm@50keV : 4.65499E-02 ( -0.0505452 1303.18 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7586 for 55 degrees of freedom
# Null hypothesis probability = 9.065708e-01
Photon flux (15-150 keV) in 5.28 sec: 1.77954 ( 5.22046 -0.18093 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31372e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.81e-07
S(50-100 keV) = 2.16e-07
T90 vs. Hardness ratio plot
T90 = 4.60799998044968 sec.
Hardness ratio (energy fluence ratio) = 1.19337
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.37041
Count Ratio (50-100 keV) / (15-25 keV) = 0.833849
Mask shadow pattern
IMX = 5.785397549756811E-01, IMY = -4.375974786548340E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-187.755400 -2.716000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.5332 -62.6913 4.2 58.7 -153.3 -8.9124 -2.8 5.8 GX 301-2
245.0045 -15.6312 1.2 23.7 -62.4 6.3623 9.8 1.5 Sco X-1
255.8507 -37.6715 7.6 11.1 -141.3 0.7274 1.5 12.2 4U 1700-377
256.2850 -36.2489 0.0 10.0 -136.4 -0.3725 -0.8 12.7 GX 349+2
262.9889 -24.8942 5.7 5.6 -30.0 0.9277 2.0 9.0 GX 1+4
264.6857 -44.5947 6.6 14.6 177.4 0.8385 1.7 9.0 4U 1735-44
268.3875 -1.3037 5.4 28.8 0.7 -1.1776 -2.2 9.0 SW J1753.5-0127
270.3628 -24.9866 4.7 6.6 36.3 1.0778 2.4 7.0 GX 5-1
270.3583 -25.8716 3.0 5.9 41.7 1.7385 3.9 8.3 GRS 1758-258
273.9649 -13.8853 7.7 17.9 22.4 0.7475 1.5 9.4 GX 17+2
275.9257 -30.3679 377.4 8.9 89.9 0.0156 0.0 0.1 H1820-303
285.1500 -24.9733 10.5 18.0 73.5 0.6376 1.1 7.0 HT1900.1-2455
288.8338 10.9472 15.6 46.7 27.1 1.0027 0.7 2.1 GRS 1915+105
262.9007 -33.9771 7.5 4.6 -156.1 0.7329 1.5 9.6 GX 354-0
306.9751 -14.7399 3.7 40.9 72.4 6.6480 3.1 ------ UNKNOWN
295.8001 3.5394 2.7 44.3 40.9 5.9252 4.3 ------ UNKNOWN
301.3533 -24.8278 2.9 32.0 84.4 3.6803 4.0 ------ UNKNOWN
243.1094 -78.1606 2.9 49.2 -179.1 4.3664 4.0 ------ UNKNOWN
265.8762 5.2902 4.1 35.3 -4.6 1.6704 2.8 ------ UNKNOWN
263.5494 9.8124 3.2 39.8 -8.2 2.5392 3.6 ------ UNKNOWN
251.7937 23.8175 3.2 55.4 -20.4 6.4115 3.6 ------ UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-2.716000 2.564000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6605 -62.7593 40.1 58.6 -153.3 -0.0757 -0.3 0.7 GX 301-2
245.0113 -15.7891 11.2 23.6 -62.7 -0.0519 -1.0 9.1 Sco X-1
256.0040 -37.9986 4.1 11.3 -142.9 -0.1121 -2.8 9.3 4U 1700-377
256.4599 -36.5782 13.5 10.1 -138.3 0.0331 0.9 9.4 GX 349+2
262.9761 -24.7043 42.1 5.8 -29.4 -0.0110 -0.3 3.1 GX 1+4
264.6699 -44.2942 6.5 14.3 177.6 -0.0699 -1.8 9.9 4U 1735-44
268.4033 -1.4545 24.7 28.7 0.8 0.0226 0.5 2.1 SW J1753.5-0127
270.1685 -25.2130 150.6 6.3 36.4 -0.0030 -0.1 10.2 GX 5-1
270.4611 -25.8889 68.1 5.9 42.5 0.0069 0.2 12.2 GRS 1758-258
274.1486 -14.1753 5.1 17.7 23.3 -0.0961 -2.3 11.8 GX 17+2
275.8205 -30.4003 12.0 8.9 90.1 -0.0419 -1.0 5.8 H1820-303
285.1965 -25.0558 4.4 18.1 73.8 -0.1198 -2.6 11.9 HT1900.1-2455
288.7976 10.9219 5.0 46.6 27.1 -0.2739 -2.3 1.4 GRS 1915+105
262.9127 -33.8497 13.6 4.5 -155.4 -0.0346 -0.8 3.9 GX 354-0
288.8199 -1.5935 0.8 36.0 37.1 1.1937 15.3 ------ UNKNOWN
285.0964 3.7999 2.9 38.6 27.2 0.2851 4.0 ------ UNKNOWN
235.4193 -67.5001 2.2 41.6 -168.2 0.3539 5.3 ------ UNKNOWN
228.0810 -71.1827 2.7 46.0 -169.2 0.3318 4.3 ------ UNKNOWN
215.8965 -48.5471 2.6 41.8 -135.8 0.3400 4.3 ------ UNKNOWN
190.0052 -63.5308 3.0 57.1 -154.1 0.7720 3.9 ------ UNKNOWN
193.1989 -57.6535 2.3 55.8 -147.0 1.1760 5.1 ------ UNKNOWN
UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
79.044600 542.187200
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.5015 35.3832 5.7 48.9 -27.8 -5.4559 -2.0 3.3 Her X-1
255.9005 -37.6972 5.9 47.1 -134.4 -7.7048 -1.9 9.7 4U 1700-377
256.2511 -36.3116 81.4 45.9 -133.2 0.5601 0.1 11.1 GX 349+2
263.0976 -24.6140 7.3 33.8 -125.3 3.0115 1.6 9.3 GX 1+4
264.9253 -44.5085 9.4 47.8 -147.4 3.6817 1.2 8.6 4U 1735-44
268.3613 -1.5966 5.8 20.4 -80.6 2.8253 2.0 8.7 SW J1753.5-0127
270.4311 -25.0206 8.9 29.4 -134.7 2.1846 1.3 8.7 GX 5-1
270.4345 -25.7815 11.6 30.0 -135.7 1.6707 1.0 7.5 GRS 1758-258
273.9785 -14.1841 6.8 19.3 -121.8 2.2576 1.7 9.0 GX 17+2
275.9726 -30.3591 6.3 31.2 -148.6 2.9459 1.8 2.5 H1820-303
285.0294 -24.9215 431.1 23.6 -161.8 0.0352 0.0 0.4 HT1900.1-2455
288.9188 10.8848 8.8 12.5 10.3 1.5887 1.3 8.0 GRS 1915+105
299.6413 35.3480 5.1 38.3 24.0 4.6308 2.3 9.1 Cyg X-1
308.1123 40.9523 216.4 46.0 30.0 0.1786 0.1 0.1 Cyg X-3
263.1585 -33.9629 46.6 40.3 -136.6 0.5454 0.2 11.4 GX 354-0
303.5030 -25.4640 2.6 27.8 160.2 6.8004 4.4 ------ UNKNOWN
286.2551 48.1821 2.7 49.8 7.5 12.7779 4.3 ------ UNKNOWN
253.6375 44.1074 3.3 55.4 -20.4 15.2954 3.6 ------ UNKNOWN
Plot creation:
Sat May 30 18:07:32 EDT 2015