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
274.9660 -68.1617 0.0294 39.4425 -12.8425 1.1509258 6.534 TRIG_00558271
Foreground time interval of the image:
25.572 73.301 (delta_t = 47.729 [sec])
Background time interval of the image:
-13.299 25.572 (delta_t = 38.871 [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)
The mask-weighted light curves based on cleaned DPHs
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 25.572 sec. to 386.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09102 ( -0.153755 0.160297 )
Norm@50keV : 6.83922E-04 ( -7.53294e-05 7.43192e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.31 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.108433e-01
Photon flux (15-150 keV) in 361.3 sec: 0.107124 ( -0.00917545 0.00917858 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29386e-06 ( -2.29431e-07 2.3341e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.572 sec. to 386.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.717651 ( -1.03428 0.823106 )
Epeak [keV] : 35.4842 ( -7.27756 6.60606 )
Norm@50keV : 4.69544E-03 ( -0.00469716 0.0161482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.985053e-01
Photon flux (15-150 keV) in 361.3 sec: 0.102422 ( -0.0094437 0.009485 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99753e-06 ( -2.42783e-07 2.68789e-07 ) ergs/cm2
Band function
Time interval is from 25.572 sec. to 386.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.15254 ( -4.74275 -4.15254 )
beta : -2.49898 ( -0.40906 0.281256 )
Epeak [keV] : 26.2822 ( -3.21114 1.83899 )
Norm@50keV : 22.4702 ( -22.4702 15.1903 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.85 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 4.061066e-01
Photon flux (15-150 keV) in 361.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12066e-06 ( -2.11814e-06 -2.45467e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.91179 (-0.789889 0.879495)
R^2/D10^2 : 7.86158E-02 (-0.0246014 0.0352897)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.08 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.605787e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.369e-07 5.891e-08
25- 50 9.145e-07 8.364e-08
50-150 3.385e-07 8.174e-08
15-150 1.690e-06 1.765e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.5394 (-10.8345 15.7283)
Norm : 0.596840 (-0.0815227 0.100994)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.34 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.919489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.330e-07 6.178e-08
25- 50 7.789e-07 7.931e-08
50-150 7.918e-07 1.835e-07
15-150 2.104e-06 2.316e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.80082 (-1.48003 1.39918)
R1^2/D10^2 : 0.178343 (-0.0814363 0.198469)
kT2 [keV] : 20.4086 (-7.09489 31.4901)
R2^2/D10^2 : 1.50425E-03 (-0.00152069 0.00957056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.53 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.34 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Reduced chi-squared = 1.042 for 55 degrees of freedom
# Null hypothesis probability = 3.470530e-01
# Null hypothesis probability = 3.885751e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.067e-07 2.690e-07
25- 50 7.885e-07 4.229e-07
50-150 6.399e-07 3.736e-07
15-150 1.935e-06 1.025e-06
Peak spectrum fit
Power-law model
Time interval is from 31.844 sec. to 32.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04449 ( -0.540216 0.621952 )
Norm@50keV : 4.80881E-03 ( -0.00194347 0.00186214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9226 for 57 degrees of freedom
# Null hypothesis probability = 6.411046e-01
Photon flux (15-150 keV) in 1 sec: 0.736466 ( -0.241858 0.242309 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44726e-08 ( -1.61772e-08 1.69159e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.844 sec. to 32.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.99546 ( )
Epeak [keV] : 32.3832 ( -5.12517 223.483 )
Norm@50keV : 3589.84 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.21 using 59 PHA bins.
# Reduced chi-squared = 0.8966 for 56 degrees of freedom
# Null hypothesis probability = 6.927197e-01
Photon flux (15-150 keV) in 1 sec: 0.642917 ( -0.233876 0.262307 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11098e-08 ( -1.14262e-08 2.0695e-08 ) ergs/cm2
Band function
Time interval is from 31.844 sec. to 32.844 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -3.28673 ( 3.28673 1.26778 )
Epeak [keV] : 31.5638 ( -9.27212 7.85413 )
Norm@50keV : 216.868 ( -66.3424 1635.89 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.08 using 59 PHA bins.
# Reduced chi-squared = 0.8923 for 55 degrees of freedom
# Null hypothesis probability = 6.992436e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.86077e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.83005 (-2.21387 3.21236)
R^2/D10^2 : 0.598669 (-0.598669 1.28006)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.43 using 59 PHA bins.
# Reduced chi-squared = 0.8847 for 57 degrees of freedom
# Null hypothesis probability = 7.182331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.996e-09 5.570e-09
25- 50 1.855e-08 1.174e-08
50-150 6.675e-09 5.125e-09
15-150 3.422e-08 2.122e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 54.0739 (-29.0529 134.117)
Norm : 4.11325 (-1.79177 3.23596)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.70 using 59 PHA bins.
# Reduced chi-squared = 0.9071 for 57 degrees of freedom
# Null hypothesis probability = 6.734060e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.023e-08 6.515e-09
25- 50 1.509e-08 1.077e-08
50-150 1.574e-08 2.085e-08
15-150 4.106e-08 3.708e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 4.09228E-05 (-4.09239e-05 -4.09239e-05)
kT2 [keV] : 8.31578 (-1.65794 2.99612)
R2^2/D10^2 : 0.726646 (-0.485255 0.666725)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.43 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.21 using 59 PHA bins.
# Reduced chi-squared = 0.9169 for 55 degrees of freedom
# Reduced chi-squared = 0.8946 for 55 degrees of freedom
# Null hypothesis probability = 6.496540e-01
# Null hypothesis probability = 6.946089e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.999e-09 5.480e-04
25- 50 1.855e-08 4.823e-03
50-150 6.715e-09 1.177e-01
15-150 3.426e-08 1.270e-01
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: 2.04480 ( -0.256572 0.271845 )
Norm@50keV : 1.42457E-03 ( -0.000269115 0.000264837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.09 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.141500e-01
Photon flux (15-150 keV) in 47.73 sec: 0.218220 ( -0.0348427 0.0349054 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.28661e-07 ( -1.1046e-07 1.1295e-07 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.387002 ( -2.10518 1.44987 )
Epeak [keV] : 38.8442 ( -6.828 8.76193 )
Norm@50keV : 3.90705E-02 ( -0.0395996 0.773392 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 56 degrees of freedom
# Null hypothesis probability = 3.261202e-01
Photon flux (15-150 keV) in 47.73 sec: 0.205529 ( -0.034482 0.034939 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35717e-07 ( -1.00597e-07 1.11507e-07 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97318 ( -1.79743 -4.97318 )
beta : -2.75491 ( -0.885526 0.486302 )
Epeak [keV] : 29.4278 ( -4.35039 4.25305 )
Norm@50keV : 90.7652 ( -13.5996 177.582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.699675e-01
Photon flux (15-150 keV) in 47.73 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) = 7.08e-07
S(50-100 keV) = 6.65e-07
T90 vs. Hardness ratio plot
T90 = 332.555999934673 sec.
Hardness ratio (energy fluence ratio) = 0.939266
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.13343
Count Ratio (50-100 keV) / (15-25 keV) = 0.465238
Mask shadow pattern
IMX = 8.020726844248932E-01, IMY = 1.828526217484349E-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:
-13.299400 25.572000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9607 -15.6249 0.7 23.9 111.6 1.7850 15.8 1.4 Sco X-1
255.9639 -37.7864 12.2 12.4 34.4 0.0787 0.9 3.6 4U 1700-377
256.2729 -36.3297 13.2 11.2 39.1 0.0690 0.9 9.6 GX 349+2
262.8463 -24.7217 4.0 5.4 134.7 0.2171 2.9 9.0 GX 1+4
264.9000 -44.6002 5.9 15.6 -3.8 0.1456 1.9 11.2 4U 1735-44
268.5203 -1.3199 0.0 27.8 176.6 0.1014 1.1 12.1 SW J1753.5-0127
270.4272 -25.1916 3.1 5.2 -144.3 -0.2757 -3.8 10.3 GX 5-1
270.4536 -25.8816 5.6 4.8 -138.5 -0.1545 -2.1 11.6 GRS 1758-258
274.1654 -13.9019 0.0 16.7 -160.9 0.1515 2.0 12.3 GX 17+2
276.0998 -30.3557 4.0 8.5 -86.6 -0.2201 -2.9 9.1 H1820-303
284.8677 -24.7760 0.0 17.0 -108.1 0.3438 4.1 12.6 HT1900.1-2455
288.8439 10.8451 3.8 45.4 -156.1 0.4476 3.1 6.6 GRS 1915+105
262.8401 -33.8574 3.3 5.7 23.8 0.2610 3.5 7.6 GX 354-0
335.5453 -82.5474 2.2 58.5 -16.0 2.2027 5.2 ------ UNKNOWN
294.0474 -18.9155 2.4 27.1 -113.6 0.4693 4.8 ------ UNKNOWN
294.4732 13.5811 2.1 50.5 -151.6 1.0912 5.5 ------ UNKNOWN
317.0212 -44.4732 2.3 42.6 -62.4 1.5108 5.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
25.572000 73.300590
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8508 -15.5413 7.5 24.0 111.7 -0.2792 -1.5 9.5 Sco X-1
256.1501 -37.9411 5.3 12.3 33.4 0.2713 2.2 9.7 4U 1700-377
256.6550 -36.3130 0.0 11.0 38.1 0.2616 2.1 12.5 GX 349+2
262.8979 -24.6534 3.6 5.4 135.6 -0.3759 -3.2 8.2 GX 1+4
264.8690 -44.5599 6.8 15.6 -3.7 -0.1990 -1.7 8.5 4U 1735-44
268.5203 -1.3200 0.0 27.8 176.6 -0.0795 -0.6 12.1 SW J1753.5-0127
270.4447 -25.1273 2.7 5.3 -144.6 0.4959 4.4 9.2 GX 5-1
270.1778 -25.5801 7.5 4.8 -143.2 0.1843 1.6 11.9 GRS 1758-258
273.8459 -14.1708 0.0 16.4 -161.6 0.2978 2.5 12.3 GX 17+2
276.1052 -30.2706 5.1 8.5 -87.2 0.2745 2.3 11.0 H1820-303
284.8677 -24.7760 0.0 17.0 -108.1 -0.2604 -2.0 12.6 HT1900.1-2455
288.9074 11.0378 2.8 45.6 -156.2 0.9524 4.2 8.5 GRS 1915+105
262.7817 -33.9569 0.0 5.8 23.6 -0.0744 -0.6 12.7 GX 354-0
274.9659 -68.1618 1.8 39.4 -12.8 1.1497 6.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
161.700600 963.088100
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
170.4677 -60.5678 241.2 40.3 -28.3 0.0393 0.0 5.6 Cen X-3
186.7825 -62.5815 6.7 33.9 -20.2 -1.0521 -1.7 11.8 GX 301-2
256.0217 -37.8605 2.4 32.0 75.7 4.9317 4.9 1.9 4U 1700-377
256.3112 -36.4471 6.8 33.3 76.6 1.8683 1.7 6.2 GX 349+2
264.5857 -44.4448 12.0 24.3 86.4 0.7833 1.0 6.7 4U 1735-44
275.8097 -30.4099 8.6 37.7 105.7 2.0392 1.4 6.5 H1820-303
263.0239 -33.9826 5.4 34.8 87.1 2.6856 2.1 9.0 GX 354-0
318.2437 -44.4284 3.0 32.6 170.1 2.7680 3.9 ------ UNKNOWN
224.8527 -59.7648 2.8 22.7 11.2 2.2146 4.2 ------ UNKNOWN
286.3016 -64.4996 2.6 5.9 161.5 2.2620 4.5 ------ UNKNOWN
356.0952 -29.5599 4.4 59.6 -161.6 17.1477 2.6 ------ UNKNOWN
141.4576 -56.5278 4.6 50.7 -44.5 9.3697 2.5 ------ UNKNOWN
19.1074 -50.9567 3.0 48.5 -130.3 12.6038 3.8 ------ UNKNOWN
Plot creation:
Thu Nov 12 16:25:48 EST 2015