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
198.7837 -12.1492 0.0044 32.5868 35.3390 2.9112320 44.323 TRIG_00632180
Foreground time interval of the image:
0.064 10.821 (delta_t = 10.757 [sec])
Background time interval of the image:
-239.080 0.064 (delta_t = 239.144 [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 0.064 sec. to 28.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61101 ( -0.075347 0.0757363 )
Norm@50keV : 8.29543E-03 ( -0.000350947 0.000350263 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.79 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.747330e-01
Photon flux (15-150 keV) in 28.05 sec: 1.06967 ( -0.046572 0.04667 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17327e-06 ( -9.77635e-08 9.81026e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 28.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27787 ( -0.30866 0.287996 )
Epeak [keV] : 110.361 ( -30.6882 300.871 )
Norm@50keV : 1.21142E-02 ( -0.00330188 0.00494191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 0.9970 for 56 degrees of freedom
# Null hypothesis probability = 4.811548e-01
Photon flux (15-150 keV) in 28.05 sec: 1.04839 ( -0.049798 0.04986 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12019e-06 ( -1.08865e-07 1.08565e-07 ) ergs/cm2
Band function
Time interval is from 0.064 sec. to 28.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27785 ( -0.28698 0.273784 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 110.341 ( -26.5864 299.569 )
Norm@50keV : 1.21129E-02 ( -0.00330196 0.00494232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.433278e-01
Photon flux (15-150 keV) in 28.05 sec: 1.04450 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12765e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6317 ( )
R^2/D10^2 : 0.126035 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 180.92 using 59 PHA bins.
# Reduced chi-squared = 3.1740 for 57 degrees of freedom
# Null hypothesis probability = 8.173994e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.591e-07 1.244e-08
25- 50 6.175e-07 3.632e-08
50-150 8.895e-07 7.139e-08
15-150 1.666e-06 8.233e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 176.130 (-34.7268 -175.914)
Norm : 4.34391 (-0.202336 0.218915)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.81 using 59 PHA bins.
# Reduced chi-squared = 0.9792 for 57 degrees of freedom
# Null hypothesis probability = 5.196298e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.080e-07 1.978e-08
25- 50 5.836e-07 5.750e-08
50-150 1.226e-06 3.813e-07
15-150 2.118e-06 4.135e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.85418 (-0.957918 1.05229)
R1^2/D10^2 : 1.21616 (-0.464846 0.868353)
kT2 [keV] : 24.9326 (-3.11484 4.40231)
R2^2/D10^2 : 1.48493E-02 (-0.00670066 0.00985758)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Null hypothesis probability = 4.501519e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.968e-07 4.948e-08
25- 50 5.861e-07 6.255e-08
50-150 1.228e-06 1.750e-07
15-150 2.110e-06 2.562e-07
Peak spectrum fit
Power-law model
Time interval is from 5.368 sec. to 6.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40531 ( -0.105813 0.106148 )
Norm@50keV : 3.85027E-02 ( -0.00243488 0.00243197 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.85 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.467431e-02
Photon flux (15-150 keV) in 1 sec: 4.69460 ( -0.302006 0.302348 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71637e-07 ( -2.57857e-08 2.59044e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.368 sec. to 6.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.816476 ( -0.475044 0.429654 )
Epeak [keV] : 104.317 ( -25.9489 130.276 )
Norm@50keV : 7.49228E-02 ( -0.0282564 0.0514565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.19 using 59 PHA bins.
# Reduced chi-squared = 1.289 for 56 degrees of freedom
# Null hypothesis probability = 7.149436e-02
Photon flux (15-150 keV) in 1 sec: 4.58376 ( -0.31235 0.31245 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58687e-07 ( -2.7887e-08 2.7836e-08 ) ergs/cm2
Band function
Time interval is from 5.368 sec. to 6.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.816357 ( -0.373405 0.471861 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 104.292 ( -18.3353 130.183 )
Norm@50keV : 7.49282E-02 ( -0.0282586 0.0514985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.19 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 55 degrees of freedom
# Null hypothesis probability = 5.985835e-02
Photon flux (15-150 keV) in 1 sec: 4.60754 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61116e-07 ( -3.61109e-07 -2.6934e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.1423 ( )
R^2/D10^2 : 0.427879 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 114.87 using 59 PHA bins.
# Reduced chi-squared = 2.0153 for 57 degrees of freedom
# Null hypothesis probability = 8.836589e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.301e-08 2.895e-09
25- 50 9.755e-08 8.735e-09
50-150 1.783e-07 2.140e-08
15-150 2.988e-07 2.280e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 19.3410 (-1.2239 1.22393)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.40 using 59 PHA bins.
# Reduced chi-squared = 1.393 for 57 degrees of freedom
# Null hypothesis probability = 2.659570e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.845e-08 3.235e-09
25- 50 9.319e-08 8.920e-09
50-150 2.044e-07 5.055e-08
15-150 3.460e-07 5.625e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.03103 (-1.58131 1.77747)
R1^2/D10^2 : 2.72429 (-1.20978 2.6801)
kT2 [keV] : 27.2100 (-4.80964 8.58295)
R2^2/D10^2 : 5.41511E-02 (-0.033762 0.0586404)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.15 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 55 degrees of freedom
# Null hypothesis probability = 8.193215e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.851e-08 8.815e-09
25- 50 9.544e-08 2.635e-08
50-150 2.270e-07 9.357e-08
15-150 3.610e-07 1.287e-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: 1.55839 ( -0.0667929 0.0670194 )
Norm@50keV : 1.81444E-02 ( -0.000659262 0.000658288 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.13 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.148935e-01
Photon flux (15-150 keV) in 10.76 sec: 2.30259 ( -0.0884547 0.0886651 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83579e-06 ( -7.12198e-08 7.14083e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39879 ( -0.259393 0.19107 )
Epeak [keV] : 198.338 ( -91.3205 -198.338 )
Norm@50keV : 2.16418E-02 ( -0.00393242 0.00694634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.91 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 56 degrees of freedom
# Null hypothesis probability = 2.186143e-01
Photon flux (15-150 keV) in 10.76 sec: 2.27873 ( -0.09515 0.09534 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.816e-06 ( -7.83651e-08 7.79885e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.71162 ( -4.71162 -4.71162 )
beta : -1.58588 ( -0.0716681 0.0705533 )
Epeak [keV] : 22.5183 ( -6.48974 3.29421 )
Norm@50keV : 2249.52 ( -80.6044 8.90401e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.68 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 55 degrees of freedom
# Null hypothesis probability = 2.224954e-01
Photon flux (15-150 keV) in 10.76 sec: 2.26673 ( ) 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) = 5.66e-07
S(50-100 keV) = 7.41e-07
T90 vs. Hardness ratio plot
T90 = 15.8359999656677 sec.
Hardness ratio (energy fluence ratio) = 1.30919
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.34356
Count Ratio (50-100 keV) / (15-25 keV) = 0.950539
Mask shadow pattern
IMX = 5.214252454502871E-01, IMY = -3.697232123462328E-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:
-239.080000 0.064000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9686 -15.6429 0.8 46.1 -36.0 6.4460 15.3 0.6 Sco X-1
254.4702 35.3175 6.6 41.2 -114.2 1.0932 1.7 1.6 Her X-1
200.0387 -3.7017 2.4 24.5 41.1 1.0370 4.9 ------ UNKNOWN
201.6901 34.0670 3.5 19.2 161.7 0.5943 3.3 ------ UNKNOWN
257.4479 41.7565 3.1 45.3 -122.2 3.2173 3.7 ------ UNKNOWN
254.1122 1.9143 3.7 43.7 -63.9 3.0290 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.064000 10.820600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8547 -15.5372 0.0 45.9 -36.0 0.0860 0.9 9.5 Sco X-1
254.3469 35.4536 6.3 41.2 -114.4 0.2328 1.8 8.6 Her X-1
198.7837 -12.1492 0.3 32.6 35.3 2.9111 44.3 ------ UNKNOWN
183.1238 51.8618 2.3 41.4 162.7 0.3578 5.0 ------ UNKNOWN
207.9237 -22.5778 2.1 40.3 16.4 0.3928 5.5 ------ UNKNOWN
244.7526 24.8400 2.6 30.9 -99.4 0.2748 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
76.020600 963.010000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
169.9543 -60.6527 8.9 52.9 -8.2 1.7450 1.3 10.8 Cen X-3
186.7045 -62.7668 2.4 51.4 -18.4 5.0174 4.7 1.3 GX 301-2
206.9332 3.4066 3.0 17.5 -177.4 1.6794 3.9 ------ UNKNOWN
246.0216 13.0399 2.9 53.2 -142.1 12.6198 4.0 ------ UNKNOWN
Plot creation:
Thu May 28 13:25:14 EDT 2015