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
297.6873 -32.4181 0.0230 28.2113 -134.7361 1.6206704 8.355 TRIG_00277571
Foreground time interval of the image:
-14.000 88.501 (delta_t = 102.501 [sec])
Background time interval of the image:
-68.899 -14.000 (delta_t = 54.899 [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 80.000000
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 80.000000
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 80.000000
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 -14.000 sec. to 180.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09708 ( -0.252268 0.269745 )
Norm@50keV : 5.19398E-04 ( -8.99912e-05 8.67977e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.96 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.722031e-01
Photon flux (15-150 keV) in 194 sec: 8.15968E-02 ( -0.0101321 0.0101369 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.35934e-07 ( -1.42055e-07 1.46253e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.000 sec. to 180.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19135 ( )
Epeak [keV] : 83.8099 ( )
Norm@50keV : 4.40861E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.42 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 56 degrees of freedom
# Null hypothesis probability = 1.606631e-01
Photon flux (15-150 keV) in 194 sec: 8.16555E-02 ( -0.0102354 0.0101002 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.37916e-07 ( -1.44243e-07 1.40035e-07 ) ergs/cm2
Band function
Time interval is from -14.000 sec. to 180.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.83499 ( -4.83499 -4.83499 )
beta : -2.17842 ( -0.331915 0.286311 )
Epeak [keV] : 19.9891 ( -19.9891 4.63505 )
Norm@50keV : 296.450 ( -36.6536 949173 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.68 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 55 degrees of freedom
# Null hypothesis probability = 1.344333e-01
Photon flux (15-150 keV) in 194 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] : 7.89982 (-1.15116 1.39961)
R^2/D10^2 : 9.06065E-02 (-0.0436649 0.0816814)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.77 using 59 PHA bins.
# Reduced chi-squared = 1.522 for 57 degrees of freedom
# Null hypothesis probability = 6.719189e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.965e-07 4.133e-08
25- 50 3.364e-07 6.373e-08
50-150 8.473e-08 3.466e-08
15-150 6.176e-07 1.154e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.6970 (-19.2388 37.6241)
Norm : 0.434969 (-0.0971977 0.13241)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.15 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.845162e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.093e-07 3.885e-08
25- 50 3.112e-07 5.044e-08
50-150 3.323e-07 1.182e-07
15-150 8.527e-07 1.586e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.18101 (-1.18034 0.653166)
R1^2/D10^2 : 0.216821 (-0.114462 0.291332)
kT2 [keV] : 43.1750 (-20.4759 -43.295)
R2^2/D10^2 : 1.56915E-04 (-0.000145804 0.000930492)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.17 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Null hypothesis probability = 2.101206e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.295e-07 8.118e-08
25- 50 2.849e-07 8.965e-08
50-150 5.295e-07 2.939e-07
15-150 1.044e-06 3.708e-07
Peak spectrum fit
Power-law model
Time interval is from 4.000 sec. to 5.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52024 ( -0.620341 0.603928 )
Norm@50keV : 3.26306E-03 ( -0.00118235 0.00117072 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.04 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.929375e-01
Photon flux (15-150 keV) in 1 sec: 0.409600 ( -0.149054 0.15044 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08561e-08 ( -1.16875e-08 1.20582e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.000 sec. to 5.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.46810 ( 1.52598 3.85487 )
Epeak [keV] : 49.2162 ( -13.67 -48.8969 )
Norm@50keV : 0.152569 ( -0.18686 32205.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.69 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 56 degrees of freedom
# Null hypothesis probability = 1.991855e-01
Photon flux (15-150 keV) in 1 sec: 0.358384 ( -0.149717 0.167475 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27852e-08 ( -9.6281e-09 1.64539e-08 ) ergs/cm2
Band function
Time interval is from 4.000 sec. to 5.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.88366 ( -4.88366 -4.88366 )
beta : -2.43859 ( 2.43859 1.12587 )
Epeak [keV] : 39.1391 ( -39.1391 14.725 )
Norm@50keV : 23.2823 ( -7.85374 2.1169e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.88 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 55 degrees of freedom
# Null hypothesis probability = 1.927626e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72219e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.5138 (-3.47319 5.72808)
R^2/D10^2 : 9.38214E-02 (-0.0938221 0.217969)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.72 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.253477e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.115e-09 1.988e-09
25- 50 1.029e-08 6.265e-09
50-150 9.952e-09 7.080e-09
15-150 2.335e-08 1.513e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 187.272 (-137.613 -185.963)
Norm : 1.69217 (-0.60096 0.977582)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.76 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.995173e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.247e-09 2.657e-09
25- 50 8.109e-09 4.897e-09
50-150 1.741e-08 1.081e-08
15-150 2.977e-08 1.775e-08
Double BB
R1^2/D10^2 : 3.74411E-05 ( )
kT2 [keV] : 10.8719 (-8.61833 5.15281)
R2^2/D10^2 : 0.140801 (-0.107946 0.205719)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.72 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.37 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.12 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Reduced chi-squared = 1.152 for 55 degrees of freedom
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Null hypothesis probability = 1.737105e-01
# Null hypothesis probability = 2.051214e-01
# Null hypothesis probability = 2.112943e-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: 2.15544 ( -0.237204 0.253763 )
Norm@50keV : 7.95459E-04 ( -0.000133483 0.000129685 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.72 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.774132e-01
Photon flux (15-150 keV) in 102.5 sec: 0.128682 ( -0.0154143 0.0154197 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62137e-07 ( -1.10016e-07 1.13088e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22405 ( -1.99203 -1.99203 )
Epeak [keV] : 127.490 ( )
Norm@50keV : 7.23378E-04 ( -0.000183268 0.00191793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.70 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 56 degrees of freedom
# Null hypothesis probability = 1.551006e-01
Photon flux (15-150 keV) in 102.5 sec: 0.128672 ( -0.015409 0.015364 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6107e-07 ( -1.2691e-07 1.13093e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.61688 ( -4.61688 -4.61688 )
beta : -2.30804 ( -0.350659 0.290918 )
Epeak [keV] : 21.3376 ( -21.3376 3.94731 )
Norm@50keV : 211.368 ( -25.1226 1.41553e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.08 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 55 degrees of freedom
# Null hypothesis probability = 1.658632e-01
Photon flux (15-150 keV) in 102.5 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) = 2.89e-07
S(50-100 keV) = 2.71e-07
T90 vs. Hardness ratio plot
T90 = 168 sec.
Hardness ratio (energy fluence ratio) = 0.937716
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.938603
Count Ratio (50-100 keV) / (15-25 keV) = 0.353757
Mask shadow pattern
IMX = -3.775748491186838E-01, IMY = 3.810693254627415E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000
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:
-68.899400 -14.000000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.0726 -60.6764 5.2 54.4 6.1 -0.7120 -2.2 7.8 Cen X-3
186.6466 -62.7915 3.4 46.4 7.4 0.4812 3.4 1.3 GX 301-2
244.9865 -15.6498 0.7 33.3 112.8 2.5203 16.9 0.7 Sco X-1
256.0406 -38.0378 6.1 9.2 100.7 0.1366 1.9 11.9 4U 1700-377
256.4687 -36.4640 6.5 10.2 108.2 0.1252 1.8 2.9 GX 349+2
262.9638 -24.8462 2.8 19.7 144.3 0.2961 4.1 6.5 GX 1+4
264.9079 -44.4990 6.5 0.1 -107.8 0.1353 1.8 7.7 4U 1735-44
268.3784 -1.3931 3.9 43.2 154.5 0.5190 3.0 3.6 SW J1753.5-0127
270.2846 -25.0082 3.2 20.0 164.0 0.2570 3.6 4.3 GX 5-1
270.2610 -25.6669 2.1 19.3 164.3 0.3888 5.5 5.1 GRS 1758-258
274.0020 -14.0223 4.2 31.5 166.6 0.2493 2.8 0.9 GX 17+2
275.7825 -30.4037 8.4 16.5 -175.4 0.1047 1.4 7.7 H1820-303
285.1982 -24.9073 3.1 25.6 -163.8 0.2826 3.7 8.9 HT1900.1-2455
262.8254 -33.7720 11.5 10.8 140.6 0.0674 1.0 9.0 GX 354-0
200.6671 -73.8915 2.5 40.6 -8.2 0.4640 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.000000 88.500600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.5226 -60.5721 6.7 54.2 6.3 -1.1810 -1.7 6.8 Cen X-3
186.6077 -62.8732 6.1 46.3 7.3 -0.5741 -1.9 6.3 GX 301-2
244.9457 -15.6584 5.0 33.3 112.8 0.7439 2.3 2.2 Sco X-1
255.9804 -38.0247 7.6 9.2 100.6 -0.2405 -1.5 10.8 4U 1700-377
256.3840 -36.2273 8.8 10.4 108.7 0.2001 1.3 12.0 GX 349+2
262.9382 -24.5816 5.0 20.0 144.3 0.3754 2.3 10.6 GX 1+4
264.8160 -44.6556 0.0 0.2 -42.0 -0.1104 -0.7 12.7 4U 1735-44
268.3270 -1.5038 18.8 43.1 154.4 -0.2216 -0.6 3.9 SW J1753.5-0127
270.1106 -25.0714 12.0 19.9 163.6 0.1541 1.0 9.4 GX 5-1
270.2370 -25.5537 4.8 19.4 164.2 -0.4084 -2.6 11.9 GRS 1758-258
273.8850 -13.9815 5.4 31.5 166.3 -0.4159 -2.1 7.8 GX 17+2
275.9032 -30.1942 14.1 16.8 -175.4 0.1294 0.8 10.4 H1820-303
285.1395 -24.7965 3.6 25.7 -164.0 -0.5186 -3.2 9.3 HT1900.1-2455
262.9510 -33.6408 7.0 10.9 141.2 0.2390 1.6 11.8 GX 354-0
152.7522 -66.2105 2.4 57.8 -4.6 4.6604 4.8 ------ UNKNOWN
297.6872 -32.4180 1.4 28.2 -134.7 1.6197 8.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
141.700600 963.120100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.2049 -37.7716 0.0 34.1 77.0 1.1934 1.3 11.2 4U 1700-377
256.2976 -36.2549 0.0 34.2 79.8 0.6089 0.7 12.1 GX 349+2
262.9912 -24.7783 4.4 31.3 103.0 2.1919 2.6 2.2 GX 1+4
264.8481 -44.5802 4.2 28.2 62.8 1.6981 2.7 9.0 4U 1735-44
268.5241 -1.2971 0.0 41.5 140.6 -3.2367 -2.5 13.2 SW J1753.5-0127
270.3462 -25.0315 2.0 25.0 108.0 3.3683 5.7 4.4 GX 5-1
270.3664 -25.8342 3.9 24.7 106.3 1.6614 3.0 6.5 GRS 1758-258
274.0250 -14.0818 3.8 28.3 132.7 1.7012 3.0 2.9 GX 17+2
275.9228 -30.2834 2.8 18.7 98.6 1.8974 4.1 5.0 H1820-303
284.8696 -24.7797 0.0 13.6 128.8 0.5349 1.4 12.4 HT1900.1-2455
288.8026 10.9449 0.7 44.2 175.4 13.1616 15.7 0.3 GRS 1915+105
262.9692 -33.7689 2.7 29.0 85.6 3.0812 4.3 4.1 GX 354-0
277.3700 -23.7370 1.4 19.9 118.6 3.5027 8.2 ------ UNKNOWN
281.5876 -15.6923 2.7 22.2 142.9 1.8518 4.2 ------ UNKNOWN
294.8318 -27.1098 2.7 5.8 161.9 1.9676 4.3 ------ UNKNOWN
352.2650 -83.0309 2.6 53.8 0.9 6.0454 4.4 ------ UNKNOWN
328.3097 5.7376 2.8 48.0 -129.0 11.2854 4.0 ------ UNKNOWN
343.1421 -22.9957 3.4 41.0 -83.4 9.4834 3.4 ------ UNKNOWN
Plot creation:
Sun May 31 10:25:35 EDT 2015