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
269.5229 -6.7270 0.0202 33.8515 21.5907 0.4031493 9.565 TRIG_00529582
Foreground time interval of the image:
1.096 11.088 (delta_t = 9.992 [sec])
Background time interval of the image:
-239.600 1.096 (delta_t = 240.696 [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 1.096 sec. to 11.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.949486 ( -0.36167 0.32801 )
Norm@50keV : 2.55071E-03 ( -0.000495062 0.000475854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.712797e-01
Photon flux (15-150 keV) in 9.992 sec: 0.293042 ( -0.0563332 0.0572812 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80704e-07 ( -4.91611e-08 4.93391e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.096 sec. to 11.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.955526 ( -0.375075 0.321208 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.57020E-03 ( -0.000457156 0.00379055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.11 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.334737e-01
Photon flux (15-150 keV) in 9.992 sec: 0.293439 ( -0.056915 0.055874 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80529e-07 ( -4.89378e-08 4.90667e-08 ) ergs/cm2
Band function
Time interval is from 1.096 sec. to 11.088 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.773772 ( 0.773856 0.773856 )
beta : -0.949482 ( 0.949479 0.361646 )
Epeak [keV] : 51.2652 ( -51.1578 -51.1578 )
Norm@50keV : 4.25914E-03 ( -0.00215265 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.969059e-01
Photon flux (15-150 keV) in 9.992 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] : 27.5086 (-6.46042 10.3946)
R^2/D10^2 : 5.16818E-03 (-0.00312603 0.00675788)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.44 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.324975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.438e-09 2.932e-09
25- 50 3.825e-08 1.453e-08
50-150 2.104e-07 7.691e-08
15-150 2.551e-07 9.348e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.28322 (-0.231891 0.231792)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.53 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.603705e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.196e-08 1.873e-08
25- 50 6.148e-08 3.498e-08
50-150 1.348e-07 7.789e-08
15-150 2.283e-07 1.299e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.70055 (-3.28629 5.85423)
R1^2/D10^2 : 0.182403 (-0.154176 1.31083)
kT2 [keV] : 42.9925 (-15.3734 -42.9748)
R2^2/D10^2 : 1.28285E-03 (-0.00108349 0.00346235)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.00 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.372219e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.187e-08 1.349e-08
25- 50 5.123e-08 2.716e-08
50-150 2.175e-07 1.190e-07
15-150 2.906e-07 1.457e-07
Peak spectrum fit
Power-law model
Time interval is from 2.936 sec. to 3.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43041 ( -0.642156 0.643275 )
Norm@50keV : 4.66928E-03 ( -0.00147952 0.0014686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.22 using 59 PHA bins.
# Reduced chi-squared = 1.8986 for 57 degrees of freedom
# Null hypothesis probability = 5.020632e-05
Photon flux (15-150 keV) in 1 sec: 0.572677 ( -0.190859 0.192236 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48474e-08 ( -1.5356e-08 1.55178e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.936 sec. to 3.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44662 ( -1.28999 0.6297 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.65152E-03 ( -0.00148071 0.0166117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.22 using 59 PHA bins.
# Reduced chi-squared = 1.9326 for 56 degrees of freedom
# Null hypothesis probability = 3.528604e-05
Photon flux (15-150 keV) in 1 sec: 0.577929 ( -0.197029 0.187286 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4852e-08 ( -1.53271e-08 1.52883e-08 ) ergs/cm2
Band function
Time interval is from 2.936 sec. to 3.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17352 ( 1.17358 1.17358 )
beta : -1.43007 ( 1.43032 0.641941 )
Epeak [keV] : 28.5812 ( -28.6037 -28.6037 )
Norm@50keV : 9.40443E-03 ( -0.00940471 452.119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.22 using 59 PHA bins.
# Reduced chi-squared = 1.9676 for 55 degrees of freedom
# Null hypothesis probability = 2.467247e-05
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] : 23.4507 (-8.65736 15.9016)
R^2/D10^2 : 1.41101E-02 (-0.0140894 0.0500539)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.56 using 59 PHA bins.
# Reduced chi-squared = 1.9747 for 57 degrees of freedom
# Null hypothesis probability = 1.633200e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.393e-09 9.165e-10
25- 50 7.639e-09 4.708e-09
50-150 3.135e-08 2.008e-08
15-150 4.039e-08 2.482e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-199.363 -199.363)
Norm : 2.35832 (-0.748518 0.748514)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.84 using 59 PHA bins.
# Reduced chi-squared = 1.9095 for 57 degrees of freedom
# Null hypothesis probability = 4.282919e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.872e-09 3.672e-09
25- 50 1.130e-08 6.905e-09
50-150 2.477e-08 1.525e-08
15-150 4.194e-08 2.510e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.96078 (-2.29727 3.24451)
R1^2/D10^2 : 2.85925 (-2.56178 13.3599)
kT2 [keV] : 32.0337 (-12.3568 54.6359)
R2^2/D10^2 : 4.66494E-03 (-0.00414662 0.00955634)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 105.64 using 59 PHA bins.
# Reduced chi-squared = 1.9208 for 55 degrees of freedom
# Null hypothesis probability = 4.820097e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.456e-09 4.811e-09
25- 50 8.865e-09 4.895e-09
50-150 3.222e-08 1.954e-08
15-150 4.854e-08 2.632e-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: 0.949486 ( -0.36167 0.32801 )
Norm@50keV : 2.55071E-03 ( -0.000495062 0.000475854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.712797e-01
Photon flux (15-150 keV) in 9.992 sec: 0.293042 ( -0.0563332 0.0572812 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80704e-07 ( -4.91611e-08 4.93391e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.955526 ( -0.375075 0.321208 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.57020E-03 ( -0.000457156 0.00379055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.11 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.334737e-01
Photon flux (15-150 keV) in 9.992 sec: 0.293439 ( -0.056915 0.055874 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80529e-07 ( -4.89378e-08 4.90667e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.773772 ( 0.773856 0.773856 )
beta : -0.949482 ( 0.949479 0.361646 )
Epeak [keV] : 51.2652 ( -51.1578 -51.1578 )
Norm@50keV : 4.25914E-03 ( -0.00215265 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.969059e-01
Photon flux (15-150 keV) in 9.992 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) = 5.03e-08
S(50-100 keV) = 1.04e-07
T90 vs. Hardness ratio plot
T90 = 8.88799995183945 sec.
Hardness ratio (energy fluence ratio) = 2.06759
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 2.1154
Count Ratio (50-100 keV) / (15-25 keV) = 2.01455
Mask shadow pattern
IMX = 6.236824423584943E-01, IMY = -2.468168698444961E-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:
-239.600000 1.096000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9867 -15.6346 0.3 40.9 -19.7 9.4153 33.6 0.5 Sco X-1
255.9957 -37.8286 1.2 22.1 -50.3 1.9394 10.0 1.0 4U 1700-377
256.5036 -36.3968 3.5 21.9 -46.4 0.6525 3.3 3.7 GX 349+2
263.0233 -24.7715 15.3 22.2 -11.6 0.1405 0.8 1.7 GX 1+4
264.5203 -44.4830 6.2 16.1 -72.2 0.3653 1.9 9.7 4U 1735-44
268.3296 -1.4866 3.3 39.2 22.8 1.1754 3.5 3.1 SW J1753.5-0127
270.2770 -25.0694 1.6 17.4 1.8 1.2987 7.3 0.7 GX 5-1
270.3576 -25.5866 111.3 16.9 0.9 0.0211 0.1 9.8 GRS 1758-258
273.9976 -14.0152 2.2 25.5 25.0 1.0338 5.2 1.4 GX 17+2
275.9317 -30.4229 7.7 10.1 3.8 0.2510 1.5 3.4 H1820-303
285.1048 -25.0719 15.8 12.9 52.4 0.1242 0.7 9.8 HT1900.1-2455
263.0538 -33.8365 4.7 17.5 -34.7 0.4767 2.5 3.2 GX 354-0
0.8867 -49.5266 3.0 54.3 177.1 3.0274 3.8 ------ UNKNOWN
276.3098 -37.2477 3.1 6.2 -38.1 0.6884 3.7 ------ UNKNOWN
9.5251 -55.5648 3.4 57.2 -173.9 3.5763 3.4 ------ UNKNOWN
18.2229 -66.4572 3.9 57.3 -160.1 3.4597 2.9 ------ UNKNOWN
20.1815 -65.3129 3.2 58.5 -161.0 6.0932 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
1.096000 11.088000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9216 -15.5938 12.6 41.0 -19.7 -0.0453 -0.9 4.4 Sco X-1
255.9181 -38.0497 0.0 22.1 -51.0 0.0435 1.4 12.8 4U 1700-377
256.2288 -36.4221 7.7 22.2 -46.6 0.0479 1.5 10.0 GX 349+2
263.1379 -24.6696 6.7 22.2 -11.2 -0.0537 -1.7 8.4 GX 1+4
264.6991 -44.4638 637.3 15.9 -72.2 -0.0006 -0.0 2.1 4U 1735-44
268.4029 -1.5398 4.3 39.1 22.9 0.1424 2.7 5.6 SW J1753.5-0127
270.4228 -25.1689 7.9 17.2 2.0 0.0453 1.4 9.3 GX 5-1
270.3276 -25.8352 9.1 16.8 0.3 0.0390 1.3 5.7 GRS 1758-258
274.0182 -14.1457 3.6 25.4 24.9 -0.1123 -3.2 6.6 GX 17+2
276.0130 -30.3063 142.1 10.1 4.5 0.0024 0.1 5.8 H1820-303
284.9123 -25.0200 6.1 12.9 51.6 0.0588 1.9 9.0 HT1900.1-2455
263.0136 -33.6343 118.9 17.6 -34.1 -0.0030 -0.1 12.1 GX 354-0
269.5229 -6.7270 1.2 33.9 21.6 0.4031 9.6 ------ UNKNOWN
14.0504 -58.7945 1.9 58.3 -169.3 1.0740 6.1 ------ UNKNOWN
326.2179 -87.0510 2.0 49.9 -134.4 0.7944 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
129.300600 962.471600
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9881 -15.6345 0.3 25.7 -130.2 31.4657 43.3 0.6 Sco X-1
254.4427 35.3034 4.3 44.4 -35.6 3.2500 2.7 2.5 Her X-1
255.9378 -37.8652 3.4 33.5 -178.1 2.5053 3.4 2.6 4U 1700-377
256.2798 -36.4729 3.4 32.2 -177.4 2.1913 3.4 8.1 GX 349+2
263.0100 -24.7439 3.0 19.1 -179.2 1.9619 3.8 0.1 GX 1+4
264.5759 -44.4242 4.7 38.0 168.0 2.0755 2.5 7.3 4U 1735-44
268.2935 -1.4332 3.1 5.4 -31.7 2.2287 3.7 4.6 SW J1753.5-0127
270.2568 -25.0834 1.7 18.4 160.3 3.6885 6.8 1.5 GX 5-1
270.1702 -25.6499 10.4 18.9 160.6 0.6270 1.2 9.1 GRS 1758-258
273.9852 -14.1030 1.3 8.6 132.3 4.6312 8.9 4.2 GX 17+2
275.7936 -30.2626 4.1 24.3 149.1 1.8698 2.8 9.3 H1820-303
284.8816 -24.8791 5.8 23.3 125.0 1.2707 2.0 8.8 HT1900.1-2455
288.7922 10.9436 0.5 26.0 29.6 13.5762 24.6 0.4 GRS 1915+105
299.6383 35.1849 2.4 50.6 14.2 8.0214 4.9 2.6 Cyg X-1
263.0029 -33.8203 6.0 27.8 174.0 -1.2513 -1.9 1.1 GX 354-0
287.5567 -5.7224 2.5 17.9 70.0 2.8576 4.6 ------ UNKNOWN
290.8802 24.4625 3.5 37.4 15.1 2.5806 3.3 ------ UNKNOWN
270.6298 30.5585 2.6 37.3 -16.3 3.1529 4.4 ------ UNKNOWN
264.8007 36.5383 2.5 43.5 -23.4 4.5276 4.6 ------ UNKNOWN
239.8959 30.8434 4.5 47.1 -53.3 7.9474 2.6 ------ UNKNOWN
Plot creation:
Sat May 30 18:57:11 EDT 2015