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
282.1306 -6.9790 0.0193 46.6552 141.6466 0.8337475 10.035 TRIG_00531223
Foreground time interval of the image:
0.280 5.064 (delta_t = 4.784 [sec])
Background time interval of the image:
-239.288 0.280 (delta_t = 239.568 [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 4.096000
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 4.096000
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 4.096000
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 0.280 sec. to 5.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50906 ( -0.33506 0.394653 )
Norm@50keV : 7.76598E-03 ( -0.00216841 0.00210312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.34 using 59 PHA bins.
# Reduced chi-squared = 0.9533 for 57 degrees of freedom
# Null hypothesis probability = 5.755166e-01
Photon flux (15-150 keV) in 4.784 sec: 1.53409 ( -0.263887 0.263898 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72421e-07 ( -7.61876e-08 7.88513e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.280 sec. to 5.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49451 ( -1.93986 0.501725 )
Epeak [keV] : 18.9666 ( )
Norm@50keV : 3.25489E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.03 using 59 PHA bins.
# Reduced chi-squared = 0.9470 for 56 degrees of freedom
# Null hypothesis probability = 5.879339e-01
Photon flux (15-150 keV) in 4.784 sec: 1.50315 ( -0.26631 0.26701 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50369e-07 ( -7.42352e-08 8.3277e-08 ) ergs/cm2
Band function
Time interval is from 0.280 sec. to 5.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.78898 ( 2.78898 2.78898 )
beta : -2.50907 ( -0.394532 0.334913 )
Epeak [keV] : 50.1265 ( -50.1265 -50.1265 )
Norm@50keV : 1.05550 ( -0.294712 0.285851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.34 using 59 PHA bins.
# Reduced chi-squared = 0.9880 for 55 degrees of freedom
# Null hypothesis probability = 4.998230e-01
Photon flux (15-150 keV) in 4.784 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] : 7.85879 (-1.55289 1.8303)
R^2/D10^2 : 1.80062 (-1.03052 2.65147)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.79 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.095618e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.491e-08 2.698e-08
25- 50 1.610e-07 5.100e-08
50-150 3.986e-08 2.064e-08
15-150 2.958e-07 8.896e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.0679 (-11.2186 18.0706)
Norm : 11.1967 (-3.30468 5.16871)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.07 using 59 PHA bins.
# Reduced chi-squared = 0.9311 for 57 degrees of freedom
# Null hypothesis probability = 6.230854e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.157e-07 2.748e-08
25- 50 1.413e-07 3.566e-08
50-150 9.086e-08 4.796e-08
15-150 3.479e-07 8.652e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.29084 (-2.28873 3.12441)
R1^2/D10^2 : 47.2278 (-44.5677 207182)
kT2 [keV] : 10.9905 (-3.20095 7.7928)
R2^2/D10^2 : 0.364878 (-0.342792 1.37762)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9559 for 55 degrees of freedom
# Null hypothesis probability = 5.678376e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.174e-07 6.643e-08
25- 50 1.390e-07 7.894e-08
50-150 8.488e-08 5.492e-08
15-150 3.413e-07 1.769e-07
Peak spectrum fit
Power-law model
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98879 ( -0.401971 0.444753 )
Norm@50keV : 1.36839E-02 ( -0.00393964 0.0038217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.02 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.373036e-01
Photon flux (15-150 keV) in 1 sec: 2.04204 ( -0.53996 0.54281 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26124e-07 ( -3.4397e-08 3.48195e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.183200 ( -4.79561 2.35036 )
Epeak [keV] : 45.0640 ( -34.6672 -45.0117 )
Norm@50keV : 0.208266 ( -0.218519 116.525 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 0.9938 for 56 degrees of freedom
# Null hypothesis probability = 4.879178e-01
Photon flux (15-150 keV) in 1 sec: 1.91047 ( -0.56909 0.56999 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13879e-07 ( -3.50928e-08 3.7833e-08 ) ergs/cm2
Band function
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.83511 ( -5.15365 -3.10276 )
beta : -2.87642 ( 2.86944 0.960191 )
Epeak [keV] : 37.8671 ( -8.42923 16.0898 )
Norm@50keV : 9.75592 ( -9.7278 116.69 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.610395e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17108e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2484 (-2.48319 3.19973)
R^2/D10^2 : 0.656612 (-0.412797 1.05659)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.07 using 59 PHA bins.
# Reduced chi-squared = 0.9837 for 57 degrees of freedom
# Null hypothesis probability = 5.098697e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.743e-08 9.805e-09
25- 50 5.071e-08 2.285e-08
50-150 3.686e-08 2.199e-08
15-150 1.050e-07 4.800e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.5239 (-32.3719 96.8277)
Norm : 10.2578 (-3.4792 4.9277)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 0.9930 for 57 degrees of freedom
# Null hypothesis probability = 4.900974e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.634e-08 9.285e-09
25- 50 4.199e-08 1.669e-08
50-150 5.423e-08 3.804e-08
15-150 1.226e-07 6.162e-08
Double BB
R1^2/D10^2 : 9.77561E+07 ( )
kT2 [keV] : 11.8563 (-2.67285 3.46658)
R2^2/D10^2 : 0.518494 (-0.33265 0.349447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.38 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.13 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
# Reduced chi-squared = 0.9524 for 55 degrees of freedom
# Reduced chi-squared = 0.9478 for 55 degrees of freedom
# Reduced chi-squared = 0.9475 for 55 degrees of freedom
# Null hypothesis probability = 5.753317e-01
# Null hypothesis probability = 5.850042e-01
# Null hypothesis probability = 5.856470e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.966e-08 9.820e-09
25- 50 4.751e-08 2.867e-08
50-150 4.020e-08 2.602e-08
15-150 1.074e-07 5.954e-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: 2.50906 ( -0.33506 0.394653 )
Norm@50keV : 7.76598E-03 ( -0.00216841 0.00210312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.34 using 59 PHA bins.
# Reduced chi-squared = 0.9533 for 57 degrees of freedom
# Null hypothesis probability = 5.755166e-01
Photon flux (15-150 keV) in 4.784 sec: 1.53409 ( -0.263887 0.263898 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72421e-07 ( -7.61876e-08 7.88513e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49451 ( -1.93986 0.501725 )
Epeak [keV] : 18.9666 ( )
Norm@50keV : 3.25489E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.03 using 59 PHA bins.
# Reduced chi-squared = 0.9470 for 56 degrees of freedom
# Null hypothesis probability = 5.879339e-01
Photon flux (15-150 keV) in 4.784 sec: 1.50315 ( -0.26631 0.26701 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50369e-07 ( -7.42352e-08 8.3277e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.78898 ( 2.78898 2.78898 )
beta : -2.50907 ( -0.394532 0.334913 )
Epeak [keV] : 50.1265 ( -50.1265 -50.1265 )
Norm@50keV : 1.05550 ( -0.294712 0.285851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.34 using 59 PHA bins.
# Reduced chi-squared = 0.9880 for 55 degrees of freedom
# Null hypothesis probability = 4.998230e-01
Photon flux (15-150 keV) in 4.784 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) = 1.24e-07
S(50-100 keV) = 8.69e-08
T90 vs. Hardness ratio plot
T90 = 4.432000041008 sec.
Hardness ratio (energy fluence ratio) = 0.700806
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.910163
Count Ratio (50-100 keV) / (15-25 keV) = 0.405729
Mask shadow pattern
IMX = -8.308680870820799E-01, IMY = -6.574392750988901E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.288000 0.280000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.4659 35.3615 1.6 42.0 -144.6 2.2500 7.4 1.2 Her X-1
268.3185 -1.3738 12.7 49.9 161.1 0.5396 0.9 5.6 SW J1753.5-0127
288.8074 10.9207 0.8 27.8 146.6 3.5398 15.1 1.6 GRS 1915+105
299.5901 35.2645 2.5 5.5 -144.8 0.7670 4.6 3.8 Cyg X-1
308.0777 40.9382 1.3 7.3 -59.5 1.6548 9.0 1.7 Cyg X-3
326.1782 38.3268 24.2 16.9 -3.2 0.0806 0.5 0.4 Cyg X-2
357.0289 24.8628 2.7 44.9 15.5 1.4292 4.2 ------ UNKNOWN
320.0592 34.6900 2.5 11.6 9.9 0.7552 4.6 ------ UNKNOWN
11.4501 39.5664 2.8 51.6 -8.5 1.6644 4.1 ------ UNKNOWN
268.5747 54.6383 2.5 33.3 -111.7 1.3843 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.280000 5.064000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
254.3376 35.4228 7.9 42.1 -144.5 -0.0537 -1.5 7.6 Her X-1
268.3856 -1.4282 6.6 49.9 161.0 -0.1273 -1.7 1.8 SW J1753.5-0127
288.6092 10.9856 5.8 27.8 147.1 0.0539 2.0 11.4 GRS 1915+105
299.3756 35.2374 9.6 5.6 -145.5 -0.0248 -1.2 10.7 Cyg X-1
308.0362 40.7796 7.5 7.1 -59.5 -0.0305 -1.5 10.9 Cyg X-3
326.3507 38.4177 8.4 17.0 -3.4 -0.0265 -1.4 10.2 Cyg X-2
282.1306 -6.9790 1.2 46.7 141.6 0.8337 10.0 ------ UNKNOWN
266.0249 -0.8453 3.0 51.1 163.8 0.3045 3.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
115.812590 962.779600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9802 -15.6457 0.3 37.4 -118.6 37.8687 38.4 0.3 Sco X-1
254.4939 35.3110 8.4 49.6 -41.7 2.8230 1.4 2.6 Her X-1
256.0985 -37.8408 4.0 38.9 -158.4 2.0263 2.9 5.3 4U 1700-377
256.4499 -36.4328 3.2 37.7 -157.1 2.5687 3.6 0.9 GX 349+2
262.9990 -24.6882 3.7 25.5 -148.1 1.5051 3.1 3.5 GX 1+4
264.8585 -44.5203 2.7 40.5 -172.9 3.0188 4.3 6.5 4U 1735-44
268.3843 -1.3562 2.8 14.8 -80.3 2.1046 4.2 5.9 SW J1753.5-0127
270.1656 -24.9612 4.3 21.3 -160.8 1.4013 2.7 9.6 GX 5-1
270.3262 -25.8038 5.1 22.0 -162.4 1.1723 2.3 3.9 GRS 1758-258
274.0163 -14.0335 0.9 10.7 -144.2 6.2312 12.7 0.6 GX 17+2
275.8995 -30.3668 3.4 24.1 -178.7 1.8076 3.4 1.3 H1820-303
284.9773 -24.8497 5.7 18.1 159.7 1.0464 2.0 5.3 HT1900.1-2455
288.8055 10.9580 0.4 19.1 8.5 13.0866 27.7 0.9 GRS 1915+105
299.5231 35.1537 7.6 45.2 8.3 1.4744 1.5 4.4 Cyg X-1
308.1378 41.0173 3.4 53.6 12.4 7.9357 3.4 4.1 Cyg X-3
262.9754 -33.8437 6.0 32.2 -161.2 1.0761 1.9 0.9 GX 354-0
277.0338 -58.1284 2.8 51.3 171.5 6.1931 4.2 ------ UNKNOWN
287.5919 -5.8076 1.8 5.6 66.5 3.1811 6.5 ------ UNKNOWN
285.8213 24.5501 3.1 31.7 -5.5 2.4092 3.8 ------ UNKNOWN
255.1362 -41.6646 1.9 42.2 -161.6 4.3242 6.1 ------ UNKNOWN
238.9440 -40.7395 2.2 51.1 -150.2 7.7050 5.3 ------ UNKNOWN
UNKNOWN
Plot creation:
Sat May 30 18:41:18 EDT 2015