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
211.6926 -51.5670 0.0127 17.7826 -61.1547 0.4218264 15.067 TRIG_00449549
Foreground time interval of the image:
-1.692 3.688 (delta_t = 5.380 [sec])
Background time interval of the image:
-239.480 -1.692 (delta_t = 237.788 [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)
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 -1.692 sec. to 3.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09207 ( -0.173881 0.168714 )
Norm@50keV : 5.09002E-03 ( -0.000506376 0.000505784 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.13 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.975736e-01
Photon flux (15-150 keV) in 5.38 sec: 0.589970 ( -0.0603451 0.0605417 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.87038e-07 ( -3.08396e-08 3.10911e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.692 sec. to 3.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.169232 ( -0.937812 0.750812 )
Epeak [keV] : 103.234 ( -29.5273 202.016 )
Norm@50keV : 1.42319E-02 ( -0.00795332 0.025701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9743 for 56 degrees of freedom
# Null hypothesis probability = 5.294489e-01
Photon flux (15-150 keV) in 5.38 sec: 0.565112 ( -0.063815 0.063801 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65543e-07 ( -3.69724e-08 3.63403e-08 ) ergs/cm2
Band function
Time interval is from -1.692 sec. to 3.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.32493 -5 )
beta : -1.47962 ( -0.379557 0.259027 )
Epeak [keV] : 38.8427 ( -6.90376 6.2537 )
Norm@50keV : 32.0979 ( -3.10402 66.6356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.24 using 59 PHA bins.
# Reduced chi-squared = 0.8589 for 55 degrees of freedom
# Null hypothesis probability = 7.622612e-01
Photon flux (15-150 keV) in 5.38 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] : 18.0337 (-2.19696 2.67572)
R^2/D10^2 : 3.90613E-02 (-0.0143722 0.0213639)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.15 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.977636e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.368e-08 2.916e-09
25- 50 6.333e-08 8.826e-09
50-150 1.496e-07 2.771e-08
15-150 2.266e-07 2.843e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.45042 (-0.249678 0.249652)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.72 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 57 degrees of freedom
# Null hypothesis probability = 4.920380e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.284e-08 1.814e-08
25- 50 6.317e-08 3.419e-08
50-150 1.385e-07 7.551e-08
15-150 2.345e-07 1.275e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.1665 (-2.91213 3.04799)
R1^2/D10^2 : 0.105394 (-0.0452261 0.0859465)
kT2 [keV] : 56.9981 (-49.9019 -81.5226)
R2^2/D10^2 : 7.52331E-04 (-0.000274989 0.00407668)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.24 using 59 PHA bins.
# Reduced chi-squared = 0.8772 for 55 degrees of freedom
# Null hypothesis probability = 7.284865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.906e-08 9.282e-09
25- 50 6.645e-08 3.376e-08
50-150 1.834e-07 9.753e-08
15-150 2.689e-07 1.321e-07
Peak spectrum fit
Power-law model
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32248 ( -0.369411 0.358539 )
Norm@50keV : 5.98371E-03 ( -0.00119287 0.00118809 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.36 using 59 PHA bins.
# Reduced chi-squared = 0.6554 for 57 degrees of freedom
# Null hypothesis probability = 9.794809e-01
Photon flux (15-150 keV) in 1 sec: 0.716911 ( -0.144283 0.144892 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88123e-08 ( -1.30923e-08 1.34341e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32050 ( -1.20068 0.359667 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 6.00549E-03 ( -0.00119841 0.0334375 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.36 using 59 PHA bins.
# Reduced chi-squared = 0.6671 for 56 degrees of freedom
# Null hypothesis probability = 9.739346e-01
Photon flux (15-150 keV) in 1 sec: 0.716797 ( -0.14424 0.144583 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8787e-08 ( -1.56752e-08 1.33281e-08 ) ergs/cm2
Band function
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98883 ( -4.98883 -4.98883 )
beta : -1.51699 ( -0.527305 0.441689 )
Epeak [keV] : 28.2367 ( -28.2367 8.4852 )
Norm@50keV : 273.040 ( -53.141 2.40735e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.61 using 59 PHA bins.
# Reduced chi-squared = 0.6475 for 55 degrees of freedom
# Null hypothesis probability = 9.802763e-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] : 14.5969 (-3.51186 5.6636)
R^2/D10^2 : 8.91333E-02 (-0.0598037 0.145705)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.48 using 59 PHA bins.
# Reduced chi-squared = 0.7629 for 57 degrees of freedom
# Null hypothesis probability = 9.063785e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.992e-09 1.738e-09
25- 50 1.546e-08 5.495e-09
50-150 2.215e-08 9.683e-09
15-150 4.160e-08 1.698e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-92.0074 -199.363)
Norm : 2.95425 (-0.586723 0.586741)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.41 using 59 PHA bins.
# Reduced chi-squared = 0.6739 for 57 degrees of freedom
# Null hypothesis probability = 9.721074e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.356e-09 4.252e-09
25- 50 1.415e-08 8.100e-09
50-150 3.104e-08 1.783e-08
15-150 5.254e-08 2.995e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.16464 (-3.77489 4.14098)
R1^2/D10^2 : 0.346835 (-0.189558 1.18945)
kT2 [keV] : 57.3189 (-53.0744 -75.7732)
R2^2/D10^2 : 9.90753E-04 (-0.000458239 0.0153415)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.65 using 59 PHA bins.
# Reduced chi-squared = 0.6481 for 55 degrees of freedom
# Null hypothesis probability = 9.800759e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.042e-09 3.621e-09
25- 50 1.488e-08 8.725e-09
50-150 3.786e-08 2.168e-08
15-150 5.878e-08 3.087e-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: 1.09207 ( -0.173881 0.168714 )
Norm@50keV : 5.09002E-03 ( -0.000506376 0.000505784 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.13 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.975736e-01
Photon flux (15-150 keV) in 5.38 sec: 0.589970 ( -0.0603451 0.0605417 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.87038e-07 ( -3.08396e-08 3.10911e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.169232 ( -0.937812 0.750812 )
Epeak [keV] : 103.234 ( -29.5273 202.016 )
Norm@50keV : 1.42319E-02 ( -0.00795332 0.025701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9743 for 56 degrees of freedom
# Null hypothesis probability = 5.294489e-01
Photon flux (15-150 keV) in 5.38 sec: 0.565112 ( -0.063815 0.063801 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65543e-07 ( -3.69724e-08 3.63403e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.32493 -5 )
beta : -1.47962 ( -0.379557 0.259027 )
Epeak [keV] : 38.8427 ( -6.90376 6.2537 )
Norm@50keV : 32.0979 ( -3.10402 66.6356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.24 using 59 PHA bins.
# Reduced chi-squared = 0.8589 for 55 degrees of freedom
# Null hypothesis probability = 7.622612e-01
Photon flux (15-150 keV) in 5.38 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) = 5.64e-08
S(50-100 keV) = 1.06e-07
T90 vs. Hardness ratio plot
T90 = 4.78799992799759 sec.
Hardness ratio (energy fluence ratio) = 1.87943
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 3.11091
Count Ratio (50-100 keV) / (15-25 keV) = 2.19051
Mask shadow pattern
IMX = 1.547348947023835E-01, IMY = 2.809354982755758E-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:
-239.480000 -1.692000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.6460 -60.7103 87.5 36.4 -24.7 0.0383 0.1 11.0 Cen X-3
186.6543 -62.7112 1.9 32.0 -36.4 1.6970 6.1 3.5 GX 301-2
244.9803 -15.6458 0.2 37.2 -165.8 15.4886 52.5 0.3 Sco X-1
256.0500 -37.7215 6.9 38.0 -125.7 -0.7161 -1.7 7.9 4U 1700-377
256.4179 -36.2559 19.9 38.6 -128.0 -0.2555 -0.6 10.1 GX 349+2
263.0271 -24.7796 19.1 47.5 -141.5 0.3702 0.6 2.3 GX 1+4
262.9665 -33.7869 7.8 44.4 -129.7 0.8815 1.5 3.1 GX 354-0
155.3300 -19.5907 2.2 49.4 37.1 5.5787 5.2 ------ UNKNOWN
223.1947 0.5241 2.4 36.9 148.8 1.9643 4.9 ------ UNKNOWN
166.5673 -49.1982 2.9 34.6 -4.7 1.0386 4.0 ------ UNKNOWN
259.3687 -3.7535 2.8 55.7 -166.8 2.9592 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-1.692000 3.688000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.3047 -60.5969 4.1 36.4 -24.4 -0.0967 -2.8 1.6 Cen X-3
186.6118 -62.7618 5.4 32.1 -36.4 0.0679 2.1 1.3 GX 301-2
244.9755 -15.6059 2.6 37.2 -165.9 -0.1477 -4.5 2.1 Sco X-1
256.0357 -37.9884 6.1 38.0 -125.3 -0.0854 -1.9 9.0 4U 1700-377
256.5857 -36.3471 12.4 38.7 -127.8 -0.0414 -0.9 8.6 GX 349+2
262.9003 -24.7903 41.0 47.4 -141.5 0.0184 0.3 6.5 GX 1+4
262.9886 -33.6831 8.1 44.4 -129.9 0.0979 1.4 9.1 GX 354-0
229.8212 -6.5425 2.4 33.5 164.5 0.1655 4.8 ------ UNKNOWN
211.6926 -51.5670 0.8 17.8 -61.2 0.4219 15.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
56.820600 962.580900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5697 -40.5701 4.0 51.5 20.8 8.1917 2.9 2.1 Vela X-1
170.3873 -60.6615 5.7 24.3 2.2 -1.2027 -2.0 3.1 Cen X-3
186.6499 -62.7679 0.8 17.4 -9.4 7.6868 15.4 0.2 GX 301-2
244.9679 -15.6387 0.3 44.6 179.1 40.4429 39.2 0.7 Sco X-1
256.0515 -37.7722 43.9 33.8 -146.1 -0.1857 -0.3 5.3 4U 1700-377
256.3785 -36.4057 2.1 34.9 -147.6 4.1154 5.6 2.9 GX 349+2
263.0080 -24.7463 3.5 47.1 -154.3 4.4283 3.3 0.1 GX 1+4
264.5621 -44.2777 7.5 35.4 -130.2 1.4029 1.5 12.9 4U 1735-44
270.2854 -25.0798 10.9 51.3 -147.5 -1.7400 -1.1 0.1 GX 5-1
270.2970 -25.7430 31.1 50.8 -146.9 0.6045 0.4 0.3 GRS 1758-258
275.7537 -30.2089 24.8 51.0 -138.4 1.5262 0.5 13.0 H1820-303
262.9907 -33.8494 4.6 40.6 -145.0 2.4134 2.5 0.9 GX 354-0
229.0094 -38.1079 2.6 18.1 179.2 2.1713 4.4 ------ UNKNOWN
251.3843 -45.5059 2.5 26.6 -137.0 2.7975 4.5 ------ UNKNOWN
97.8550 -64.5498 3.0 53.2 -20.3 6.1049 3.8 ------ UNKNOWN
83.8053 -62.2678 3.8 59.0 -24.3 14.9796 3.0 ------ UNKNOWN
294.8699 -68.3172 2.6 41.0 -83.7 11.6593 4.4 ------ UNKNOWN
Plot creation:
Sat May 30 22:41:40 EDT 2015