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
293.5860 9.1392 0.0173 8.2108 31.9231 0.1986825 11.113 TRIG_00150532
Foreground time interval of the image:
-0.728 2.724 (delta_t = 3.452 [sec])
Background time interval of the image:
-299.400 -0.728 (delta_t = 298.672 [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 2.048000
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 2.048000
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 2.048000
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 -0.728 sec. to 2.724 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81522 ( -0.236289 0.248688 )
Norm@50keV : 3.09043E-03 ( -0.000533724 0.00052449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.54 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.861251e-01
Photon flux (15-150 keV) in 3.452 sec: 0.428394 ( -0.0622871 0.0622912 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.81587e-08 ( -1.68821e-08 1.73889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.728 sec. to 2.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.404751 ( -1.71604 1.33673 )
Epeak [keV] : 43.6273 ( -6.98248 11.6466 )
Norm@50keV : 6.21138E-02 ( -0.0625673 0.573702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.33 using 59 PHA bins.
# Reduced chi-squared = 0.9523 for 56 degrees of freedom
# Null hypothesis probability = 5.765858e-01
Photon flux (15-150 keV) in 3.452 sec: 0.405033 ( -0.031398 0.062378 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1858e-08 ( -1.47777e-08 1.71996e-08 ) ergs/cm2
Band function
Time interval is from -0.728 sec. to 2.724 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.220379 ( -1.16149 -0.259243 )
beta : -4.03606 ( 4.07677 12.2764 )
Epeak [keV] : 44.1761 ( -15.7166 9.62245 )
Norm@50keV : 4.82285E-02 ( -0.0234942 64.5648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.32 using 59 PHA bins.
# Reduced chi-squared = 0.9694 for 55 degrees of freedom
# Null hypothesis probability = 5.391949e-01
Photon flux (15-150 keV) in 3.452 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] : 10.8651 (-1.4738 1.70217)
R^2/D10^2 : 0.159776 (-0.0676557 0.115591)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9595 for 57 degrees of freedom
# Null hypothesis probability = 5.622582e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.357e-08 3.191e-09
25- 50 3.776e-08 7.334e-09
50-150 2.494e-08 8.616e-09
15-150 7.627e-08 1.571e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 80.2527 (-28.3578 60.8952)
Norm : 2.05308 (-0.386949 0.484723)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.01 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.377288e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.839e-08 3.466e-09
25- 50 3.030e-08 5.768e-09
50-150 4.287e-08 2.523e-08
15-150 9.156e-08 2.762e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.62964 (-5.62502 -5.62502)
R1^2/D10^2 : 0.595505 (-0.596367 -0.596367)
kT2 [keV] : 13.0534 (-13.0399 -13.0399)
R2^2/D10^2 : 6.52820E-02 (-0.0656343 0.154348)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.92 using 59 PHA bins.
# Reduced chi-squared = 0.9622 for 55 degrees of freedom
# Null hypothesis probability = 5.545092e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.600e-08 8.428e-09
25- 50 3.497e-08 1.849e-08
50-150 3.090e-08 1.862e-08
15-150 8.186e-08 4.249e-08
Peak spectrum fit
Power-law model
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63671 ( -0.343479 0.36093 )
Norm@50keV : 4.15299E-03 ( -0.00097286 0.000951044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.74 using 59 PHA bins.
# Reduced chi-squared = 0.6270 for 57 degrees of freedom
# Null hypothesis probability = 9.877017e-01
Photon flux (15-150 keV) in 1 sec: 0.539925 ( -0.113811 0.113863 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.86783e-08 ( -9.42104e-09 9.74974e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.317945 ( -2.21169 1.36572 )
Epeak [keV] : 55.6924 ( -12.6005 -55.6923 )
Norm@50keV : 2.27505E-02 ( -0.0227506 0.38406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.59 using 59 PHA bins.
# Reduced chi-squared = 0.5998 for 56 degrees of freedom
# Null hypothesis probability = 9.923956e-01
Photon flux (15-150 keV) in 1 sec: 0.518289 ( -0.115457 0.116325 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42633e-08 ( -9.5197e-09 1.08888e-08 ) ergs/cm2
Band function
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.333178 ( -7.19573 1.48482 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 55.8221 ( -16.7596 330.09 )
Norm@50keV : 2.23237E-02 ( -0.0046128 0.383953 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.59 using 59 PHA bins.
# Reduced chi-squared = 0.6107 for 55 degrees of freedom
# Null hypothesis probability = 9.899368e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4653e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3221 (-2.67421 3.44369)
R^2/D10^2 : 0.125891 (-0.0745983 0.178502)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.67 using 59 PHA bins.
# Reduced chi-squared = 0.6257 for 57 degrees of freedom
# Null hypothesis probability = 9.879993e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.050e-09 1.631e-09
25- 50 1.314e-08 5.969e-09
50-150 1.221e-08 5.969e-09
15-150 2.940e-08 9.690e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 135.556 (-73.0574 -132.892)
Norm : 2.27221 (-0.517046 0.73104)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.57 using 59 PHA bins.
# Reduced chi-squared = 0.6065 for 57 degrees of freedom
# Null hypothesis probability = 9.917989e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.880e-09 3.283e-09
25- 50 1.073e-08 6.085e-09
50-150 2.028e-08 1.294e-08
15-150 3.690e-08 2.257e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.36450 (-6.34255 -6.34255)
R1^2/D10^2 : 0.680143 (-0.683873 -0.683873)
kT2 [keV] : 17.8113 (-17.7903 -17.7903)
R2^2/D10^2 : 2.47028E-02 (-0.0248291 0.136706)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.18 using 59 PHA bins.
# Reduced chi-squared = 0.6032 for 55 degrees of freedom
# Null hypothesis probability = 9.913192e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.540e-09 3.495e-09
25- 50 1.171e-08 5.930e-09
50-150 1.711e-08 1.035e-08
15-150 3.435e-08 1.782e-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: 1.81522 ( -0.236289 0.248688 )
Norm@50keV : 3.09043E-03 ( -0.000533724 0.00052449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.54 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 57 degrees of freedom
# Null hypothesis probability = 2.861251e-01
Photon flux (15-150 keV) in 3.452 sec: 0.428394 ( -0.0622871 0.0622912 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.81587e-08 ( -1.68821e-08 1.73889e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.404751 ( -1.71604 1.33673 )
Epeak [keV] : 43.6273 ( -6.98248 11.6466 )
Norm@50keV : 6.21138E-02 ( -0.0625673 0.573702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.33 using 59 PHA bins.
# Reduced chi-squared = 0.9523 for 56 degrees of freedom
# Null hypothesis probability = 5.765858e-01
Photon flux (15-150 keV) in 3.452 sec: 0.405033 ( -0.031398 0.062378 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1858e-08 ( -1.47777e-08 1.71996e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.220379 ( -1.16149 -0.259243 )
beta : -4.03606 ( 4.07677 12.2764 )
Epeak [keV] : 44.1761 ( -15.7166 9.62245 )
Norm@50keV : 4.82285E-02 ( -0.0234942 64.5648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.32 using 59 PHA bins.
# Reduced chi-squared = 0.9694 for 55 degrees of freedom
# Null hypothesis probability = 5.391949e-01
Photon flux (15-150 keV) in 3.452 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) = 2.78e-08
S(50-100 keV) = 3.16e-08
T90 vs. Hardness ratio plot
T90 = 2.99200001358986 sec.
Hardness ratio (energy fluence ratio) = 1.13669
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.3357
Count Ratio (50-100 keV) / (15-25 keV) = 0.630496
Mask shadow pattern
IMX = 1.224717432326633E-01, IMY = -7.630036168813809E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
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:
-299.400000 -0.728000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9848 -15.6504 0.7 45.9 -147.3 7.8651 15.5 0.7 Sco X-1
254.3973 35.4716 9.8 42.1 -69.4 1.2367 1.2 8.3 Her X-1
256.0847 -37.8969 8.6 51.5 -179.0 0.8404 1.3 5.6 4U 1700-377
256.4302 -36.5018 4.7 50.2 -178.1 -1.3542 -2.5 4.7 GX 349+2
263.1073 -24.8279 6.2 37.6 -173.6 0.4860 1.9 7.3 GX 1+4
264.8693 -44.4896 5.8 53.3 169.5 1.8014 2.0 5.9 4U 1735-44
268.3649 -1.4411 1.2 19.1 -139.5 2.1479 9.5 0.7 SW J1753.5-0127
270.1869 -24.9866 5.1 34.1 177.2 0.6322 2.3 7.7 GX 5-1
270.2614 -25.7250 2.9 34.7 176.5 1.1047 4.0 2.5 GRS 1758-258
274.0070 -14.0910 3.6 22.9 -177.4 0.6868 3.2 3.3 GX 17+2
276.0080 -30.3730 3.6 37.0 165.4 1.0896 3.2 4.3 H1820-303
285.0741 -24.9923 8.4 30.3 152.7 0.4237 1.4 4.8 HT1900.1-2455
288.9193 10.8529 7.3 6.2 -4.7 -0.3119 -1.6 9.0 GRS 1915+105
299.5904 35.2059 0.3 32.4 -8.9 9.6589 37.3 0.3 Cyg X-1
308.1116 40.9741 2.4 40.7 -4.0 1.5935 4.7 1.3 Cyg X-3
326.2560 38.2428 5.8 49.0 12.5 1.1819 2.0 6.2 Cyg X-2
262.9033 -33.8001 4.8 44.9 178.4 0.9770 2.4 4.8 GX 354-0
323.8145 33.7631 3.2 45.0 16.3 1.5899 3.6 ------ UNKNOWN
319.9487 48.0504 3.2 51.5 -1.2 1.8610 3.5 ------ UNKNOWN
243.8081 -31.2348 2.7 54.5 -164.3 2.9460 4.3 ------ UNKNOWN
240.3290 -35.0256 2.7 59.1 -166.1 6.4652 4.2 ------ UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.728000 2.724000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0227 -15.4917 6.8 45.8 -147.1 -0.0684 -1.7 9.3 Sco X-1
254.2228 35.2624 0.0 42.1 -69.7 0.0944 1.3 12.5 Her X-1
255.9931 -37.7242 10.1 51.4 -178.8 0.0544 1.1 7.2 4U 1700-377
256.3949 -36.4605 4.2 50.2 -178.0 0.1080 2.7 3.0 GX 349+2
263.0295 -24.9409 300.4 37.7 -173.6 -0.0009 -0.0 11.8 GX 1+4
264.8471 -44.4870 7.4 53.3 169.5 0.1170 1.6 5.0 4U 1735-44
268.3703 -1.6157 4.2 19.2 -140.0 0.0488 2.7 9.8 SW J1753.5-0127
270.1094 -25.0949 7.7 34.2 177.2 0.0343 1.5 9.5 GX 5-1
270.2110 -25.6435 4.5 34.6 176.6 -0.0595 -2.6 7.8 GRS 1758-258
273.8775 -13.9754 4.8 22.8 -177.0 0.0436 2.4 8.3 GX 17+2
276.1194 -30.3411 6.2 36.9 165.2 -0.0486 -1.9 10.2 H1820-303
284.8138 -24.9834 0.0 30.3 153.2 -0.0208 -0.9 12.7 HT1900.1-2455
288.8541 10.7414 0.0 6.0 -4.8 0.0045 0.3 12.7 GRS 1915+105
299.5386 35.1871 3.2 32.3 -9.0 -0.0732 -3.6 2.7 Cyg X-1
307.8809 40.9228 3.5 40.6 -4.2 0.0869 3.3 10.5 Cyg X-3
326.3452 38.3279 21.7 49.1 12.4 -0.0254 -0.5 8.2 Cyg X-2
262.9227 -33.9353 7.6 45.0 178.3 -0.0520 -1.5 6.9 GX 354-0
304.6244 -30.7136 2.4 40.0 125.7 0.2674 4.8 ------ UNKNOWN
293.5861 9.1391 1.0 8.2 31.9 0.1988 11.1 ------ UNKNOWN
286.7115 2.2640 2.3 3.0 142.5 0.0858 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
53.300600 122.651300
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.0900 -15.6582 23.2 54.1 -152.8 0.1583 0.5 6.5 Sco X-1
256.4255 -36.5424 4.2 57.5 179.4 -1.4773 -2.7 7.2 GX 349+2
262.9210 -24.8486 5.5 45.3 -175.1 0.3060 2.1 7.8 GX 1+4
268.3671 -1.4458 1.7 27.3 -147.4 0.5911 6.6 0.4 SW J1753.5-0127
270.2539 -25.2490 25.4 41.2 177.2 0.0605 0.5 10.3 GX 5-1
270.5014 -25.7061 5.1 41.5 176.5 -0.3073 -2.3 11.0 GRS 1758-258
273.9532 -13.9902 3.5 30.3 -175.4 0.2917 3.3 4.1 GX 17+2
275.9364 -30.3682 9.0 43.0 166.8 0.1961 1.3 0.6 H1820-303
285.1776 -24.9668 6.5 35.1 157.6 0.2316 1.8 8.2 HT1900.1-2455
288.5990 10.9001 7.7 5.2 -106.0 0.1232 1.5 12.1 GRS 1915+105
299.6048 35.2060 0.5 26.6 -24.7 2.1622 25.3 0.8 Cyg X-1
308.1046 40.9424 2.0 34.3 -16.1 0.5788 5.8 0.7 Cyg X-3
326.1611 38.3299 50.5 41.3 4.0 -0.0307 -0.2 0.7 Cyg X-2
263.0932 -33.8145 4.6 51.8 176.7 0.6070 2.5 5.3 GX 354-0
314.4193 -19.7835 2.0 35.5 109.0 1.0878 5.6 ------ UNKNOWN
284.3060 20.6202 2.4 14.5 -72.7 0.3769 4.8 ------ UNKNOWN
274.4097 55.0103 2.5 48.3 -50.4 1.9373 4.6 ------ UNKNOWN
Plot creation:
Sun May 31 16:02:04 EDT 2015