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
231.2026 -79.1158 0.0216 11.2532 49.0415 1.0457368 8.891 TRIG_00601646
Foreground time interval of the image:
-4.464 74.301 (delta_t = 78.765 [sec])
Background time interval of the image:
-141.699 -4.464 (delta_t = 137.235 [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 64.000000
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 64.000000
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 64.000000
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 -4.464 sec. to 92.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49674 ( -0.177741 0.18038 )
Norm@50keV : 1.12576E-03 ( -0.000114167 0.000112954 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9712 for 57 degrees of freedom
# Null hypothesis probability = 5.367886e-01
Photon flux (15-150 keV) in 96.82 sec: 0.140417 ( -0.0135216 0.013536 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03454e-06 ( -1.16849e-07 1.18623e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.464 sec. to 92.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49427 ( -0.62348 0.929679 )
Epeak [keV] : 9997.18 ( )
Norm@50keV : 1.12914E-03 ( -0.000644093 0.00134725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9886 for 56 degrees of freedom
# Null hypothesis probability = 4.989724e-01
Photon flux (15-150 keV) in 96.82 sec: 0.140380 ( -0.01366 0.01338 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03274e-06 ( -1.29376e-07 1.19505e-07 ) ergs/cm2
Band function
Time interval is from -4.464 sec. to 92.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22852 ( 1.22859 1.22859 )
beta : -1.49673 ( 1.49673 0.177824 )
Epeak [keV] : 34.4093 ( -34.3478 -34.3478 )
Norm@50keV : 2.16035E-03 ( -0.00114294 0.166199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.609879e-01
Photon flux (15-150 keV) in 96.82 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] : 14.6421 (-1.87957 2.21591)
R^2/D10^2 : 1.68860E-02 (-0.00650389 0.0104021)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.12 using 59 PHA bins.
# Reduced chi-squared = 1.476 for 57 degrees of freedom
# Null hypothesis probability = 1.124347e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.365e-08 1.415e-08
25- 50 2.861e-07 3.970e-08
50-150 4.129e-07 8.268e-08
15-150 7.727e-07 1.071e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 0.571617 (-0.0545127 0.0545111)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.23 using 59 PHA bins.
# Reduced chi-squared = 0.9865 for 57 degrees of freedom
# Null hypothesis probability = 5.039206e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.378e-07 1.844e-08
25- 50 2.651e-07 8.927e-08
50-150 5.815e-07 3.066e-07
15-150 9.845e-07 5.378e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.72597 (-1.95878 2.63459)
R1^2/D10^2 : 0.290755 (-0.208925 1.34193)
kT2 [keV] : 24.0008 (-5.62896 13.7215)
R2^2/D10^2 : 2.59047E-03 (-0.00202421 0.0023969)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.008226e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.400e-07 6.545e-08
25- 50 2.452e-07 8.242e-08
50-150 6.187e-07 3.154e-07
15-150 1.004e-06 3.752e-07
Peak spectrum fit
Power-law model
Time interval is from 53.120 sec. to 54.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.775289 ( -1.35635 0.947265 )
Norm@50keV : 2.82082E-03 ( -0.00161925 0.00112687 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.50 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.873511e-01
Photon flux (15-150 keV) in 1 sec: 0.324208 ( -0.324173 0.13134 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33449e-08 ( -1.36365e-08 1.33954e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 53.120 sec. to 54.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.85147 ( )
Epeak [keV] : 433.228 ( )
Norm@50keV : 1.58931E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.99 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.013635e-01
Photon flux (15-150 keV) in 1 sec: 0.330662 ( -0.330662 0.125631 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21165e-08 ( -1.26156e-08 1.48315e-08 ) ergs/cm2
Band function
Time interval is from 53.120 sec. to 54.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.874701 ( 0.875373 0.875373 )
beta : -0.774013 ( 0.770415 1.3542 )
Epeak [keV] : 14.0579 ( -14.0263 -14.0263 )
Norm@50keV : 4.17834E-03 ( -0.0024619 82353.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.50 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.273541e-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] : 52.6178 ( )
R^2/D10^2 : 1.13506E-03 (-0.00110889 0.00929806)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.02 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 57 degrees of freedom
# Null hypothesis probability = 2.175083e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.825e-09 2.615e-09
25- 50 4.684e-09 3.291e-09
50-150 6.299e-10 6.320e-10
15-150 9.139e-09 6.290e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-199.363 -199.363)
Norm : 1.34989 (-0.521947 0.521946)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.23 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.124189e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.361e-09 2.234e-09
25- 50 6.466e-09 4.082e-09
50-150 1.418e-08 9.040e-09
15-150 2.401e-08 1.560e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.53787 (-2.44126 2.98152)
R1^2/D10^2 : 2.45691 (-2.32181 173.234)
kT2 [keV] : 99.9735 (-68.8258 -100.212)
R2^2/D10^2 : 3.12347E-04 (-0.000245538 0.00344508)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.09 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.622459e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.177e-09 2.530e-09
25- 50 3.568e-09 2.136e-09
50-150 3.012e-08 3.184e-08
15-150 3.786e-08 2.752e-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: 1.40889 ( -0.205361 0.206908 )
Norm@50keV : 1.06582E-03 ( -0.000124099 0.000123133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.780107e-01
Photon flux (15-150 keV) in 78.76 sec: 0.130061 ( -0.0147431 0.0147617 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.09661e-07 ( -1.06384e-07 1.08081e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34089 ( )
Epeak [keV] : 482.105 ( )
Norm@50keV : 1.15438E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.79 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 56 degrees of freedom
# Null hypothesis probability = 2.483723e-01
Photon flux (15-150 keV) in 78.76 sec: 0.129621 ( -0.01541 0.015084 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.04998e-07 ( -1.1967e-07 1.118e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.78778 ( 8.78778 8.78778 )
beta : -1.40889 ( -0.206908 0.205357 )
Epeak [keV] : 85.3851 ( -85.3851 -85.3851 )
Norm@50keV : 0.144859 ( -0.0168668 0.0167355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 55 degrees of freedom
# Null hypothesis probability = 2.191536e-01
Photon flux (15-150 keV) in 78.76 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) = 2.55e-07
S(50-100 keV) = 3.62e-07
T90 vs. Hardness ratio plot
T90 = 77.3919999599457 sec.
Hardness ratio (energy fluence ratio) = 1.41961
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.31256
Count Ratio (50-100 keV) / (15-25 keV) = 0.989542
Mask shadow pattern
IMX = 1.304282376318495E-01, IMY = -1.502599801490593E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
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:
-141.699420 -4.464000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.4939 -40.4719 2.9 53.2 -27.7 1.7935 3.9 5.2 Vela X-1
170.4295 -60.7672 128.7 32.4 3.9 -0.0162 -0.1 9.3 Cen X-3
186.7396 -62.8021 2.0 29.7 18.5 0.9902 5.7 3.0 GX 301-2
234.8103 -56.2682 2.6 33.4 66.0 1.2397 4.5 ------ UNKNOWN
342.9842 -30.3354 2.2 56.3 -179.3 4.0328 5.2 ------ UNKNOWN
159.8901 -54.3858 2.5 39.0 -5.2 0.9497 4.6 ------ UNKNOWN
96.1326 -69.7157 2.4 23.2 -61.4 0.8116 4.8 ------ UNKNOWN
20.4764 -36.4363 2.4 52.0 -140.3 3.8059 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-4.464000 74.300590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5615 -40.5749 5.9 53.1 -27.6 0.7916 2.0 1.9 Vela X-1
170.5804 -60.6357 14.2 32.5 4.1 0.1160 0.8 7.8 Cen X-3
186.8592 -62.7846 7.7 29.7 18.6 -0.2244 -1.5 5.6 GX 301-2
256.1229 -51.8064 2.4 36.5 88.5 1.7021 4.8 ------ UNKNOWN
231.2026 -79.1158 1.3 11.3 49.0 1.0456 8.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
111.300600 963.008400
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0605 -60.4748 0.0 25.9 -24.9 -0.5511 -1.6 11.7 Cen X-3
186.6071 -62.7757 3.1 20.8 -8.7 1.3691 3.7 1.4 GX 301-2
264.6794 -44.5769 4.0 36.7 97.1 2.9993 2.9 8.1 4U 1735-44
252.3901 -40.4841 2.5 39.5 81.6 6.9616 4.6 ------ UNKNOWN
210.4336 -42.8751 3.0 37.1 30.5 2.0621 3.8 ------ UNKNOWN
220.9276 -65.6962 2.9 13.7 37.9 1.3052 4.0 ------ UNKNOWN
245.9761 -75.7859 3.4 4.6 107.6 1.1159 3.4 ------ UNKNOWN
132.2683 -84.2832 2.5 13.1 -98.2 1.5422 4.6 ------ UNKNOWN
11.2361 -39.9181 7.2 58.7 -159.2 5.7149 1.6 ------ UNKNOWN
55.9311 -64.6578 3.4 36.2 -120.6 2.1145 3.4 ------ UNKNOWN
142.6672 -39.3606 2.5 51.2 -41.4 9.4273 4.5 ------ UNKNOWN
43.5522 -52.3509 2.7 48.5 -130.2 8.3757 4.3 ------ UNKNOWN
Plot creation:
Mon Jun 8 19:25:14 EDT 2015