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
265.2273 -42.3700 0.0159 16.2770 -177.4286 0.1061385 12.041 TRIG_00325268
Foreground time interval of the image:
0.092 0.760 (delta_t = 0.668 [sec])
Background time interval of the image:
-179.459 0.092 (delta_t = 179.551 [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 0.512000
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 0.512000
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 0.512000
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 0.092 sec. to 0.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.949078 ( -0.276205 0.258528 )
Norm@50keV : 9.85758E-03 ( -0.00142475 0.00140456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9092 for 57 degrees of freedom
# Null hypothesis probability = 6.690865e-01
Photon flux (15-150 keV) in 0.668 sec: 1.13251 ( -0.164525 0.165412 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.25341e-08 ( -1.07547e-08 1.08385e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.092 sec. to 0.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.943279 ( -0.681213 0.3215 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 9.91883E-03 ( -0.00142942 0.00136223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9257 for 56 degrees of freedom
# Null hypothesis probability = 6.330940e-01
Photon flux (15-150 keV) in 0.668 sec: 1.13482 ( -0.167111 0.16299 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.23925e-08 ( -1.06114e-08 1.09038e-08 ) ergs/cm2
Band function
Time interval is from 0.092 sec. to 0.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.96295 -4.96295 )
beta : -1.02958 ( -0.309928 0.304153 )
Epeak [keV] : 28.2902 ( -28.2902 10.7729 )
Norm@50keV : 321.264 ( -43.9231 1.8174e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.51 using 59 PHA bins.
# Reduced chi-squared = 0.9185 for 55 degrees of freedom
# Null hypothesis probability = 6.464627e-01
Photon flux (15-150 keV) in 0.668 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] : 23.7084 (-4.85786 7.07235)
R^2/D10^2 : 3.12741E-02 (-0.0168666 0.0329147)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.00 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.181874e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.097e-09 6.379e-10
25- 50 1.157e-08 3.306e-09
50-150 4.849e-08 1.247e-08
15-150 6.215e-08 1.495e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.69688 (-0.682468 0.682409)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.706396e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.815e-09 4.486e-09
25- 50 1.503e-08 8.313e-09
50-150 3.297e-08 1.842e-08
15-150 5.582e-08 3.113e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.84179 (-3.98746 6.22689)
R1^2/D10^2 : 0.347467 ( )
kT2 [keV] : 69.1869 (-39.4969 -70.6871)
R2^2/D10^2 : 1.52736E-03 (-0.00106758 0.0107162)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.13 using 59 PHA bins.
#Fit statistic : Chi-Squared = 50.22 using 59 PHA bins.
# Reduced chi-squared = 0.9296 for 55 degrees of freedom
# Reduced chi-squared = 0.9130 for 55 degrees of freedom
# Null hypothesis probability = 6.233303e-01
# Null hypothesis probability = 6.576507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.211e-09 3.236e-09
25- 50 1.313e-08 7.351e-09
50-150 5.200e-08 2.996e-08
15-150 7.034e-08 3.781e-08
Peak spectrum fit
Power-law model
Time interval is from -0.074 sec. to 0.926 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.976523 ( -0.285715 0.267605 )
Norm@50keV : 7.32970E-03 ( -0.00111484 0.0011018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.993229e-01
Photon flux (15-150 keV) in 1 sec: 0.842909 ( -0.129673 0.130533 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.99291e-08 ( -1.25181e-08 1.26295e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.074 sec. to 0.926 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.974145 ( -0.389283 0.267182 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 7.37487E-03 ( -0.00109989 0.013145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.11 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 56 degrees of freedom
# Null hypothesis probability = 2.677402e-01
Photon flux (15-150 keV) in 1 sec: 0.843246 ( -0.132612 0.129089 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.98882e-08 ( -1.32459e-08 1.26018e-08 ) ergs/cm2
Band function
Time interval is from -0.074 sec. to 0.926 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95780 ( -4.9578 -4.9578 )
beta : -1.11224 ( -0.337571 0.32541 )
Epeak [keV] : 30.9479 ( -30.9479 9.39246 )
Norm@50keV : 140.175 ( -20.2411 1.19944e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.053850e-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] : 22.4534 (-4.57562 6.56392)
R^2/D10^2 : 2.75162E-02 (-0.0149142 0.0293752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.77 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 57 degrees of freedom
# Null hypothesis probability = 9.009757e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.543e-09 8.050e-10
25- 50 1.361e-08 3.514e-09
50-150 5.127e-08 1.560e-08
15-150 6.743e-08 1.766e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.51042 (-0.538888 0.538783)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.55 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 57 degrees of freedom
# Null hypothesis probability = 5.927016e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.747e-09 4.980e-09
25- 50 1.683e-08 9.505e-09
50-150 3.690e-08 2.054e-08
15-150 6.248e-08 3.489e-08
Double BB
R1^2/D10^2 : 0.249565 ( )
kT2 [keV] : 57.7183 (-16.4411 -58.9117)
R2^2/D10^2 : 1.59789E-03 (-0.00122763 0.00892316)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.77 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.78 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.76 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 55 degrees of freedom
# Reduced chi-squared = 1.105 for 55 degrees of freedom
# Reduced chi-squared = 1.105 for 55 degrees of freedom
# Null hypothesis probability = 6.397613e-02
# Null hypothesis probability = 2.754532e-01
# Null hypothesis probability = 2.762227e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
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: 0.949078 ( -0.276205 0.258528 )
Norm@50keV : 9.85758E-03 ( -0.00142475 0.00140456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9092 for 57 degrees of freedom
# Null hypothesis probability = 6.690865e-01
Photon flux (15-150 keV) in 0.668 sec: 1.13251 ( -0.164525 0.165412 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.25341e-08 ( -1.07547e-08 1.08385e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.943279 ( -0.681213 0.3215 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 9.91883E-03 ( -0.00142942 0.00136223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9257 for 56 degrees of freedom
# Null hypothesis probability = 6.330940e-01
Photon flux (15-150 keV) in 0.668 sec: 1.13482 ( -0.167111 0.16299 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.23925e-08 ( -1.06114e-08 1.08396e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.96295 -4.96295 )
beta : -1.02958 ( -0.309928 0.304153 )
Epeak [keV] : 28.2902 ( -28.2902 10.7729 )
Norm@50keV : 321.264 ( -43.9231 1.8174e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.51 using 59 PHA bins.
# Reduced chi-squared = 0.9185 for 55 degrees of freedom
# Null hypothesis probability = 6.464627e-01
Photon flux (15-150 keV) in 0.668 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) = 1.30e-08
S(50-100 keV) = 2.69e-08
T90 vs. Hardness ratio plot
T90 = 0.599999994039536 sec.
Hardness ratio (energy fluence ratio) = 2.06923
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.69536
Count Ratio (50-100 keV) / (15-25 keV) = 1.68663
Mask shadow pattern
IMX = -2.916905386315400E-01, IMY = 1.309972520275702E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000
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:
-179.459360 0.092000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9810 -15.6443 0.3 24.4 -75.0 9.4795 43.5 0.3 Sco X-1
255.9589 -37.8532 8.2 15.7 -146.7 0.2137 1.4 1.4 4U 1700-377
256.4227 -36.4014 2.5 14.4 -143.5 0.7202 4.6 1.4 GX 349+2
263.0269 -24.8792 4.8 5.2 -81.3 0.3865 2.4 8.1 GX 1+4
264.8915 -44.3623 202.5 18.3 -177.9 -0.0096 -0.1 8.3 4U 1735-44
268.3386 -1.4492 1.6 24.9 -6.7 1.2274 7.1 1.8 SW J1753.5-0127
270.3634 -24.9501 4.4 2.1 44.0 0.4158 2.6 8.9 GX 5-1
270.2174 -25.7299 3.2 1.6 62.4 0.5813 3.6 4.7 GRS 1758-258
273.9860 -14.0325 1.4 13.3 17.3 1.2730 8.2 1.2 GX 17+2
275.8713 -30.3842 2.0 7.6 117.7 0.9069 5.9 3.0 H1820-303
285.0554 -24.9528 5.6 14.9 82.1 0.3693 2.1 2.2 HT1900.1-2455
288.8198 10.9484 2.2 42.2 24.2 1.6670 5.3 1.3 GRS 1915+105
262.9640 -33.8378 1.8 8.9 -154.8 0.9735 6.3 1.3 GX 354-0
289.4577 19.7286 2.8 50.3 19.6 2.0486 4.1 ------ UNKNOWN
289.7864 12.5629 2.9 44.0 24.3 1.3329 3.9 ------ UNKNOWN
242.2216 -66.0501 2.7 43.0 -170.9 1.0489 4.3 ------ UNKNOWN
261.1584 -2.0146 2.2 25.3 -23.7 0.8334 5.3 ------ UNKNOWN
255.7088 -7.0780 2.5 22.8 -40.9 0.8007 4.7 ------ UNKNOWN
213.5665 -57.0339 2.6 49.3 -150.2 1.9053 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
0.092000 0.760000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0260 -15.5095 5.0 24.4 -74.7 -0.0279 -2.3 8.3 Sco X-1
255.7870 -37.8825 7.3 15.8 -146.4 0.0130 1.6 9.7 4U 1700-377
256.4236 -36.4101 9.3 14.4 -143.5 0.0105 1.2 1.0 GX 349+2
263.1674 -24.7975 14.5 5.1 -80.0 0.0069 0.8 9.2 GX 1+4
264.7710 -44.4580 211.9 18.4 -177.6 -0.0005 -0.1 1.3 4U 1735-44
268.3101 -1.3228 2.6 25.0 -6.8 0.0442 4.5 8.5 SW J1753.5-0127
270.3458 -25.2134 12.3 2.0 49.6 0.0086 1.0 8.7 GX 5-1
270.4211 -25.7700 17.2 1.8 65.9 -0.0070 -0.8 6.6 GRS 1758-258
273.9920 -14.1474 4.7 13.2 17.5 -0.0219 -2.4 6.7 GX 17+2
275.9620 -30.2194 8.2 7.6 116.3 -0.0126 -1.4 9.1 H1820-303
285.2036 -25.0153 6.8 15.1 82.5 0.0165 1.7 10.7 HT1900.1-2455
288.7585 11.0006 36.5 42.2 24.1 -0.0059 -0.3 4.1 GRS 1915+105
263.1824 -33.7674 6.2 8.8 -155.5 -0.0159 -1.9 10.4 GX 354-0
303.8371 6.8229 2.4 47.6 44.7 0.2055 4.8 ------ UNKNOWN
303.4407 7.8431 2.2 48.1 43.3 0.2283 5.2 ------ UNKNOWN
265.2274 -42.3700 1.0 16.3 -177.4 0.1061 11.9 ------ UNKNOWN
259.0569 31.8920 2.8 58.9 -15.6 0.2362 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
54.940590 962.917000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6436 -62.7940 2.5 48.2 -144.9 6.7446 4.6 1.5 GX 301-2
244.9722 -15.6448 0.2 31.9 -41.0 50.0373 68.4 0.5 Sco X-1
255.9857 -37.8097 3.3 8.5 -62.1 2.0162 3.5 2.1 4U 1700-377
256.4183 -36.3978 1.6 9.1 -53.6 4.2751 7.1 1.7 GX 349+2
262.9594 -24.8405 3.7 17.6 -8.8 1.7816 3.1 6.3 GX 1+4
264.6716 -44.4331 7.9 2.1 -169.7 0.9111 1.5 3.2 4U 1735-44
268.3789 -1.4114 2.6 41.1 2.9 3.9357 4.4 2.6 SW J1753.5-0127
270.2887 -25.0821 123.0 17.8 13.2 0.0532 0.1 0.3 GX 5-1
270.3026 -25.7430 4.0 17.1 13.7 1.6767 2.9 0.0 GRS 1758-258
273.9798 -14.0518 1.3 29.3 15.6 5.8316 8.8 1.8 GX 17+2
275.8922 -30.4354 3.5 14.7 37.0 1.9612 3.3 4.4 H1820-303
285.1685 -25.0502 14.8 23.8 47.9 0.5698 0.8 10.6 HT1900.1-2455
262.9698 -33.8383 1.6 8.7 -14.6 4.0819 7.2 1.0 GX 354-0
338.5211 -61.6803 3.3 46.0 139.1 8.4053 3.5 ------ UNKNOWN
283.5952 -16.9947 2.7 29.8 35.4 2.8790 4.3 ------ UNKNOWN
243.6341 -84.1233 3.1 42.2 -178.6 3.4042 3.7 ------ UNKNOWN
255.1519 -41.6742 1.6 7.6 -89.8 3.8511 7.2 ------ UNKNOWN
213.0649 -34.2178 3.2 41.1 -98.2 13.1254 3.6 ------ UNKNOWN
Plot creation:
Sun May 31 06:13:17 EDT 2015