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
200.0247 -32.0650 0.0150 39.9949 -113.2832 2.7383070 12.783 TRIG_00147788
Foreground time interval of the image:
-40.832 15.632 (delta_t = 56.464 [sec])
Background time interval of the image:
-299.472 -40.832 (delta_t = 258.640 [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
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
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 -40.832 sec. to 15.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.883089 ( -0.210093 0.197988 )
Norm@50keV : 3.07608E-03 ( -0.000382823 0.000374532 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.949553e-01
Photon flux (15-150 keV) in 56.46 sec: 0.353030 ( -0.0431119 0.0437129 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9621e-06 ( -2.14047e-07 2.14165e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.832 sec. to 15.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.273832 ( -1.05259 0.61026 )
Epeak [keV] : 184.035 ( )
Norm@50keV : 5.26188E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.47 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 56 degrees of freedom
# Null hypothesis probability = 2.045038e-01
Photon flux (15-150 keV) in 56.46 sec: 0.341371 ( -0.045519 0.046382 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93145e-06 ( -2.23723e-07 2.21114e-07 ) ergs/cm2
Band function
Time interval is from -40.832 sec. to 15.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.858335 ( 0.858337 0.858337 )
beta : -0.883068 ( -0.198221 0.210023 )
Epeak [keV] : 12.8339 ( )
Norm@50keV : 4.76171E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.481204e-01
Photon flux (15-150 keV) in 56.46 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] : 26.1742 (-3.59385 4.65189)
R^2/D10^2 : 7.62916E-03 (-0.0030107 0.00455018)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.29 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.111536e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.000e-08 1.289e-08
25- 50 2.902e-07 5.654e-08
50-150 1.463e-06 2.433e-07
15-150 1.803e-06 2.764e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.56121 (-0.180994 0.180917)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.23 using 59 PHA bins.
# Reduced chi-squared = 1.741 for 57 degrees of freedom
# Null hypothesis probability = 4.510348e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.196e-07 1.215e-07
25- 50 4.225e-07 2.341e-07
50-150 9.266e-07 5.022e-07
15-150 1.569e-06 8.579e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.3384 (-9.21512 6.66136)
R1^2/D10^2 : 3.60977E-02 (-0.0238438 4.47585)
kT2 [keV] : 40.6899 (-32.2382 -42.3748)
R2^2/D10^2 : 1.63063E-03 (-0.00140009 0.00639117)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.48 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Null hypothesis probability = 1.790404e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.517e-08 5.050e-08
25- 50 3.469e-07 1.815e-07
50-150 1.499e-06 7.585e-07
15-150 1.931e-06 9.748e-07
Peak spectrum fit
Power-law model
Time interval is from 1.060 sec. to 2.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06142 ( -0.457469 0.418868 )
Norm@50keV : 1.18286E-02 ( -0.00305293 0.00297168 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.78 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.503136e-01
Photon flux (15-150 keV) in 1 sec: 1.36731 ( -0.3598 0.364499 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25238e-07 ( -3.13365e-08 3.14628e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.060 sec. to 2.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05523 ( -0.550312 0.422837 )
Epeak [keV] : 9998.91 ( -9999.03 -9999.03 )
Norm@50keV : 1.18948E-02 ( -0.00299627 0.0434098 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.78 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 56 degrees of freedom
# Null hypothesis probability = 2.217737e-01
Photon flux (15-150 keV) in 1 sec: 1.36852 ( -0.36101 0.36133 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25235e-07 ( -1.5737e-08 3.1421e-08 ) ergs/cm2
Band function
Time interval is from 1.060 sec. to 2.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.25557 ( -0.593087 0.530773 )
Epeak [keV] : 32.8704 ( -32.8632 53.8883 )
Norm@50keV : 185.579 ( -44.3792 3.38605e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.31 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.323360e-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] : 23.9152 (-8.19464 13.2475)
R^2/D10^2 : 3.64666E-02 (-0.026825 0.10281)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.78 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.364118e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.707e-09 2.086e-09
25- 50 2.055e-08 1.067e-08
50-150 8.759e-08 4.600e-08
15-150 1.118e-07 5.956e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.85707 (-1.48281 1.48255)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.76 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.557306e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.458e-08 8.925e-09
25- 50 2.806e-08 1.700e-08
50-150 6.153e-08 3.604e-08
15-150 1.042e-07 6.375e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.37483 (-4.03732 7.78692)
R1^2/D10^2 : 0.543037 (-0.464453 3.0664)
kT2 [keV] : 55.5850 (-50.5898 -55.8763)
R2^2/D10^2 : 2.54598E-03 (-0.00244439 0.0239129)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.36 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.308544e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.027e-08 6.195e-09
25- 50 2.728e-08 1.644e-08
50-150 8.794e-08 4.870e-08
15-150 1.255e-07 6.350e-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: 0.883089 ( -0.210093 0.197988 )
Norm@50keV : 3.07608E-03 ( -0.000382823 0.000374532 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.949553e-01
Photon flux (15-150 keV) in 56.46 sec: 0.353030 ( -0.0431119 0.0437129 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9621e-06 ( -2.14047e-07 2.14165e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.273832 ( -1.05259 0.61026 )
Epeak [keV] : 184.035 ( )
Norm@50keV : 5.26188E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.47 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 56 degrees of freedom
# Null hypothesis probability = 2.045038e-01
Photon flux (15-150 keV) in 56.46 sec: 0.341371 ( -0.045519 0.046382 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93145e-06 ( -2.23723e-07 2.21114e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.858335 ( 0.858337 0.858337 )
beta : -0.883068 ( -0.198221 0.210023 )
Epeak [keV] : 12.8339 ( )
Norm@50keV : 4.76171E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.95 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.481204e-01
Photon flux (15-150 keV) in 56.46 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) = 3.36e-07
S(50-100 keV) = 7.28e-07
T90 vs. Hardness ratio plot
T90 = 46.4959999918938 sec.
Hardness ratio (energy fluence ratio) = 2.16667
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.49702
Count Ratio (50-100 keV) / (15-25 keV) = 2.11474
Mask shadow pattern
IMX = -3.316159402810754E-01, IMY = 7.706268201810363E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
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:
-299.472000 -40.832000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.5875 -62.7605 8.3 51.9 -155.1 0.7371 1.4 2.0 GX 301-2
244.9803 -15.6449 0.2 11.9 -10.7 8.9692 47.9 0.3 Sco X-1
256.0002 -37.8312 0.9 13.2 138.6 2.4235 13.0 1.0 4U 1700-377
256.3818 -36.4593 2.5 12.4 133.2 0.8611 4.6 3.4 GX 349+2
263.0204 -24.8838 11.8 15.3 78.7 0.2029 1.0 8.3 GX 1+4
264.6555 -44.5241 2.7 22.5 138.6 0.9915 4.3 5.8 4U 1735-44
268.3878 -1.5044 1.2 33.6 37.8 3.1693 10.0 3.3 SW J1753.5-0127
270.3415 -25.0364 2.0 21.8 83.7 1.2897 5.7 4.0 GX 5-1
270.2053 -25.7436 3.1 21.5 85.5 0.8173 3.8 5.3 GRS 1758-258
273.8598 -14.0798 18.1 29.1 62.9 -0.1874 -0.6 8.9 GX 17+2
275.7775 -30.5275 0.0 26.0 98.5 0.4367 1.7 12.3 H1820-303
284.9280 -24.9264 4.8 34.7 89.5 1.1010 2.4 5.9 HT1900.1-2455
262.8178 -33.9907 0.0 15.7 113.2 -0.3314 -1.5 12.7 GX 354-0
263.9226 -17.3030 3.4 19.3 56.5 0.7158 3.4 ------ UNKNOWN
251.4538 -45.6188 2.4 18.6 163.1 0.8916 4.8 ------ UNKNOWN
250.8211 29.4530 2.1 57.2 -0.4 6.3394 5.5 ------ UNKNOWN
183.7893 -49.7585 3.2 51.8 -138.5 4.4136 3.7 ------ UNKNOWN
206.1042 -10.3397 3.4 41.4 -78.6 3.3516 3.5 ------ UNKNOWN
194.9355 -33.9073 3.3 44.1 -116.7 3.3035 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-40.832000 15.632000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.7086 -62.7682 69.6 51.9 -155.2 0.0340 0.2 1.4 GX 301-2
244.9363 -15.4857 6.4 12.1 -10.9 0.1317 1.8 9.6 Sco X-1
256.1735 -37.8619 5.6 13.3 138.2 0.1546 2.1 8.9 4U 1700-377
256.6197 -36.4401 6.3 12.6 132.6 0.1283 1.8 9.0 GX 349+2
262.9617 -24.7775 4.1 15.3 78.2 -0.2317 -2.8 3.2 GX 1+4
264.8426 -44.5863 46.6 22.7 138.5 -0.0218 -0.2 9.2 4U 1735-44
268.4753 -1.3194 5.4 33.8 37.8 0.2600 2.1 10.3 SW J1753.5-0127
270.4489 -25.0652 9.9 21.9 83.9 -0.1150 -1.2 9.0 GX 5-1
270.3718 -25.6739 41.0 21.7 85.4 -0.0290 -0.3 5.6 GRS 1758-258
273.8554 -14.0485 60.9 29.1 62.8 0.0231 0.2 8.8 GX 17+2
275.9161 -30.3221 49.4 26.1 98.1 -0.0277 -0.2 2.7 H1820-303
284.9455 -24.8124 64.6 34.8 89.3 0.0329 0.2 8.1 HT1900.1-2455
263.0451 -33.6857 7.5 15.8 111.9 -0.1263 -1.5 9.4 GX 354-0
272.0830 -1.8915 2.1 35.7 43.3 0.7461 5.6 ------ UNKNOWN
240.4815 21.3600 2.2 49.2 -12.2 0.8237 5.1 ------ UNKNOWN
214.0982 -11.4012 2.7 34.1 -73.4 0.5623 4.3 ------ UNKNOWN
200.0247 -32.0650 0.9 40.0 -113.3 2.7384 12.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
108.828590 302.577900
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
135.5400 -40.6114 8.2 51.5 -143.5 0.7900 1.4 3.4 Vela X-1
170.6837 -60.6228 4.2 34.4 -179.4 -0.4362 -2.8 10.8 Cen X-3
186.5152 -62.6427 3.4 31.8 167.2 0.5671 3.4 8.6 GX 301-2
244.9690 -15.6360 1.0 43.8 54.3 6.4509 11.7 0.7 Sco X-1
242.3816 -72.8113 2.0 46.2 139.4 2.9147 5.7 ------ UNKNOWN
235.1686 -12.4912 2.9 37.6 42.2 1.0882 4.0 ------ UNKNOWN
231.8839 -40.6145 2.4 26.8 93.0 0.9799 4.8 ------ UNKNOWN
228.3617 2.0218 2.8 43.4 19.0 1.1096 4.1 ------ UNKNOWN
164.4030 -43.1352 2.7 30.1 -146.4 0.6341 4.3 ------ UNKNOWN
132.5305 -39.8684 3.4 53.9 -143.2 3.1122 3.4 ------ UNKNOWN
Plot creation:
Sun May 31 16:25:07 EDT 2015