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
309.2525 -44.1774 0.0182 47.4042 162.8163 2.3124980 10.590 TRIG_00375246
Foreground time interval of the image:
-0.840 51.752 (delta_t = 52.592 [sec])
Background time interval of the image:
-239.608 -0.840 (delta_t = 238.768 [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 16.384000
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 16.384000
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 16.384000
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 -0.840 sec. to 51.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30624 ( -0.254288 0.245172 )
Norm@50keV : 3.16003E-03 ( -0.000415803 0.000413227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.489874e-01
Photon flux (15-150 keV) in 52.59 sec: 0.377434 ( -0.0550933 0.0555345 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63972e-06 ( -2.19003e-07 2.19798e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.840 sec. to 51.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17212 ( )
Epeak [keV] : 63.7133 ( )
Norm@50keV : 9.18811E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.87 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 56 degrees of freedom
# Null hypothesis probability = 3.370438e-01
Photon flux (15-150 keV) in 52.59 sec: 0.381405 ( -0.059527 0.052057 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63917e-06 ( -2.18433e-07 2.12416e-07 ) ergs/cm2
Band function
Time interval is from -0.840 sec. to 51.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03587 ( 1.03588 1.03588 )
beta : -1.30620 ( 1.30622 0.255018 )
Epeak [keV] : 42.5635 ( -42.5544 -42.5544 )
Norm@50keV : 6.09942E-03 ( -0.00334845 0.479556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.824734e-01
Photon flux (15-150 keV) in 52.59 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] : 22.4180 (-4.43355 6.00928)
R^2/D10^2 : 1.08889E-02 (-0.0108392 0.0119929)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.30 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 57 degrees of freedom
# Null hypothesis probability = 8.960713e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.280e-08 1.595e-08
25- 50 2.823e-07 7.620e-08
50-150 1.060e-06 2.409e-07
15-150 1.395e-06 3.087e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.60894 (-0.211293 0.211209)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.20 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 57 degrees of freedom
# Null hypothesis probability = 1.892730e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.107e-07 1.194e-07
25- 50 4.054e-07 2.245e-07
50-150 8.890e-07 4.899e-07
15-150 1.505e-06 8.183e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.06964 (-2.10593 2.72506)
R1^2/D10^2 : 0.428331 (-0.298161 1.31377)
kT2 [keV] : 42.5836 (-13.6225 53.1157)
R2^2/D10^2 : 1.32424E-03 (-0.00111652 0.00187838)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.97 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.662814e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.983e-07 1.113e-07
25- 50 3.632e-07 1.739e-07
50-150 1.157e-06 6.123e-07
15-150 1.719e-06 8.082e-07
Peak spectrum fit
Power-law model
Time interval is from 8.204 sec. to 9.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35843 ( -0.558068 0.524517 )
Norm@50keV : 1.01567E-02 ( -0.00298279 0.00296745 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.494930e-01
Photon flux (15-150 keV) in 1 sec: 1.22572 ( -0.390403 0.397278 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90125e-08 ( -2.98731e-08 3.00976e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.204 sec. to 9.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.18313 ( )
Epeak [keV] : 326.852 ( )
Norm@50keV : 9.14874E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.12 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.288485e-01
Photon flux (15-150 keV) in 1 sec: 1.22678 ( -0.394555 0.3955 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.89389e-08 ( -3.05463e-08 3.00911e-08 ) ergs/cm2
Band function
Time interval is from 8.204 sec. to 9.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.637794 ( 0.842581 0.842581 )
beta : -1.43113 ( 1.4218 0.614979 )
Epeak [keV] : 69.7126 ( -68.1926 648.186 )
Norm@50keV : 2.73091E-02 ( -0.0290725 1.02532e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.47 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.849220e-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] : 18.6410 (-7.20373 13.4696)
R^2/D10^2 : 6.59330E-02 (-0.0651311 0.298939)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.43 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.328795e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.534e-09 2.975e-09
25- 50 2.151e-08 1.304e-08
50-150 5.472e-08 3.556e-08
15-150 8.077e-08 5.180e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-115.113 -199.363)
Norm : 5.19227 (-1.52606 1.52614)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.15 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 57 degrees of freedom
# Null hypothesis probability = 3.293512e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.293e-08 7.880e-09
25- 50 2.487e-08 1.496e-08
50-150 5.455e-08 3.267e-08
15-150 9.235e-08 5.470e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.75289 (-5.55049 7.8717)
R1^2/D10^2 : 0.639922 (-0.540608 17.1571)
kT2 [keV] : 40.7048 (-40.7874 -44.366)
R2^2/D10^2 : 3.90266E-03 (-0.00319438 0.0507667)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.02 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 2.988491e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.023e-08 7.070e-09
25- 50 2.477e-08 1.489e-08
50-150 6.185e-08 3.762e-08
15-150 9.685e-08 5.195e-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: 1.30624 ( -0.254288 0.245172 )
Norm@50keV : 3.16003E-03 ( -0.000415803 0.000413227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.489874e-01
Photon flux (15-150 keV) in 52.59 sec: 0.377434 ( -0.0550933 0.0555345 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63972e-06 ( -2.19003e-07 2.19798e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17212 ( )
Epeak [keV] : 63.7133 ( )
Norm@50keV : 9.18811E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.87 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 56 degrees of freedom
# Null hypothesis probability = 3.370438e-01
Photon flux (15-150 keV) in 52.59 sec: 0.381405 ( -0.059527 0.052057 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63917e-06 ( -2.18433e-07 2.12416e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03587 ( 1.03588 1.03588 )
beta : -1.30620 ( 1.30622 0.255018 )
Epeak [keV] : 42.5635 ( -42.5544 -42.5544 )
Norm@50keV : 6.09942E-03 ( -0.00334845 0.479556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.824734e-01
Photon flux (15-150 keV) in 52.59 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) = 3.66e-07
S(50-100 keV) = 5.92e-07
T90 vs. Hardness ratio plot
T90 = 48.0320000648499 sec.
Hardness ratio (energy fluence ratio) = 1.61749
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.39932
Count Ratio (50-100 keV) / (15-25 keV) = 1.24246
Mask shadow pattern
IMX = -1.039103341736319E+00, IMY = -3.213317189307310E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 16.384000
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:
-239.608000 -0.840000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9770 -15.6503 0.7 37.4 -100.8 8.3701 15.6 0.6 Sco X-1
254.5019 35.3677 2.2 46.4 -20.1 2.3577 5.3 2.6 Her X-1
256.0620 -37.7879 8.0 41.0 -139.2 0.5264 1.4 4.9 4U 1700-377
256.2874 -36.5046 5.5 39.9 -138.1 -0.7222 -2.1 8.7 GX 349+2
262.9731 -24.7435 1.8 27.3 -131.8 1.6844 6.4 2.0 GX 1+4
264.9519 -44.5922 17.0 43.2 -153.0 -0.2398 -0.7 12.4 4U 1735-44
268.4083 -1.4099 3.0 12.9 -69.5 0.7722 3.9 3.5 SW J1753.5-0127
270.2870 -25.0634 2.7 23.7 -144.8 0.9035 4.3 1.0 GX 5-1
270.3622 -25.7898 3.1 24.3 -145.8 0.7790 3.8 4.3 GRS 1758-258
273.9395 -14.0026 2.9 12.4 -135.7 0.7416 4.0 4.4 GX 17+2
276.0548 -30.2307 4.5 26.9 -160.2 0.5563 2.6 10.6 H1820-303
284.9754 -24.8595 4.3 21.4 -179.5 0.5661 2.7 4.9 HT1900.1-2455
288.7942 10.9415 0.5 16.6 37.6 4.9533 23.1 0.3 GRS 1915+105
299.6065 35.1927 0.8 42.7 32.7 6.6648 15.1 1.0 Cyg X-1
262.8460 -33.8992 13.0 34.6 -142.6 -0.2245 -0.9 8.1 GX 354-0
314.0305 -43.3670 2.4 49.2 158.7 3.2621 4.9 ------ UNKNOWN
277.4410 -54.2648 3.6 50.6 -167.0 1.4865 3.2 ------ UNKNOWN
268.0519 -22.3357 0.5 22.4 -136.7 4.5234 21.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.840000 51.752000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9728 -15.5200 7.8 37.4 -100.6 0.3071 1.5 7.2 Sco X-1
254.3820 35.3024 8.9 46.4 -20.2 0.2273 1.3 4.4 Her X-1
255.9370 -37.9758 21.5 41.2 -139.2 0.0809 0.5 8.2 4U 1700-377
256.3212 -36.5497 3.8 39.9 -138.2 0.4306 3.0 9.4 GX 349+2
262.9257 -24.7539 3.6 27.3 -131.7 -0.3187 -3.2 4.6 GX 1+4
264.7509 -44.4845 370.1 43.2 -152.7 -0.0047 -0.0 2.1 4U 1735-44
268.2174 -1.4579 4.8 13.1 -69.9 0.2019 2.4 9.0 SW J1753.5-0127
270.4428 -25.0781 9.0 23.6 -145.1 0.1159 1.3 8.6 GX 5-1
270.4570 -25.7195 6.1 24.2 -145.9 -0.1709 -1.9 8.5 GRS 1758-258
273.8731 -14.1624 49.4 12.6 -135.8 -0.0186 -0.2 10.8 GX 17+2
276.0913 -30.4996 10.6 27.1 -160.3 0.0975 1.1 11.7 H1820-303
284.8921 -24.9802 11.3 21.5 -179.2 0.0836 1.0 8.6 HT1900.1-2455
288.9140 10.8133 84.2 16.5 38.2 -0.0124 -0.1 10.5 GRS 1915+105
299.5851 35.2816 11.3 42.7 32.6 0.1962 1.0 4.8 Cyg X-1
263.1316 -33.7305 6.5 34.3 -142.7 0.1915 1.8 9.5 GX 354-0
309.2525 -44.1774 1.1 47.4 162.8 2.3119 10.6 ------ UNKNOWN
304.4269 -48.0941 2.0 48.6 169.5 1.2366 5.7 ------ UNKNOWN
281.7239 -32.6978 2.0 28.9 -170.9 0.4902 5.7 ------ UNKNOWN
273.7324 -27.0091 2.3 24.3 -153.7 0.4050 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
134.692600 790.392600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
256.1101 -37.7655 9.1 39.9 -90.8 2.0286 1.3 7.5 4U 1700-377
256.2038 -36.4581 0.0 40.5 -88.9 0.0331 0.0 11.4 GX 349+2
263.0722 -24.6383 5.7 42.1 -69.0 3.4209 2.0 7.3 GX 1+4
264.8221 -44.4876 12.2 31.4 -97.5 0.5495 0.9 4.1 4U 1735-44
270.2760 -25.0966 2.4 36.8 -62.9 3.3948 4.8 1.1 GX 5-1
270.4512 -25.7989 5.8 36.3 -63.6 1.3906 2.0 8.7 GRS 1758-258
274.0915 -14.1676 9.2 42.3 -47.0 0.9979 1.3 9.3 GX 17+2
275.9619 -30.3830 4.0 29.6 -64.6 1.4073 2.9 2.1 H1820-303
285.1955 -24.9111 13.2 27.4 -44.4 0.3351 0.9 8.7 HT1900.1-2455
288.8070 10.9631 2.2 58.2 -14.8 9.7691 5.4 1.2 GRS 1915+105
263.0949 -33.9910 515.1 36.7 -81.1 -0.0198 -0.0 10.8 GX 354-0
336.3924 -4.3431 2.8 46.4 47.9 7.1733 4.1 ------ UNKNOWN
331.3216 -7.0601 3.3 41.8 43.0 3.2766 3.5 ------ UNKNOWN
49.2903 -68.6957 3.6 52.9 162.4 5.7250 3.2 ------ UNKNOWN
123.3098 -77.1804 3.0 58.6 -172.5 10.1577 3.8 ------ UNKNOWN
268.0691 -22.3326 0.9 40.2 -61.8 11.4487 12.5 ------ UNKNOWN
253.8675 -38.8564 2.5 41.0 -93.5 7.2186 4.5 ------ UNKNOWN
Plot creation:
Sun May 31 02:38:20 EDT 2015