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
257.1795 -22.7234 0.0100 15.7422 9.0098 1.4662310 19.241 TRIG_00530581
Foreground time interval of the image:
-14.200 22.184 (delta_t = 36.384 [sec])
Background time interval of the image:
-87.347 -14.200 (delta_t = 73.147 [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 1.024000
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 1.024000
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 1.024000
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 -14.200 sec. to 22.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95746 ( -0.133917 0.136902 )
Norm@50keV : 2.24746E-03 ( -0.000183531 0.000180831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9042 for 57 degrees of freedom
# Null hypothesis probability = 6.793818e-01
Photon flux (15-150 keV) in 36.38 sec: 0.330693 ( -0.0232016 0.0232541 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52615e-07 ( -5.88443e-08 5.95184e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.200 sec. to 22.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95350 ( -0.494957 0.382185 )
Epeak [keV] : 502.300 ( )
Norm@50keV : 2.25918E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9203 for 56 degrees of freedom
# Null hypothesis probability = 6.442758e-01
Photon flux (15-150 keV) in 36.38 sec: 0.330593 ( -0.024143 0.023117 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52488e-07 ( -7.03116e-08 5.87901e-08 ) ergs/cm2
Band function
Time interval is from -14.200 sec. to 22.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93878 ( -14.6987 -4.93878 )
beta : -2.03535 ( -0.160275 0.151288 )
Epeak [keV] : 20.9525 ( -7.48448 3.1949 )
Norm@50keV : 997.455 ( -67.898 7024.58 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.35 using 59 PHA bins.
# Reduced chi-squared = 0.8792 for 55 degrees of freedom
# Null hypothesis probability = 7.246865e-01
Photon flux (15-150 keV) in 36.38 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] : 10.2007 ( )
R^2/D10^2 : 0.134973 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 114.11 using 59 PHA bins.
# Reduced chi-squared = 2.0019 for 57 degrees of freedom
# Null hypothesis probability = 1.082845e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.047e-07 1.457e-08
25- 50 2.677e-07 2.161e-08
50-150 1.480e-07 2.756e-08
15-150 5.205e-07 4.638e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.7003 (-16.3954 24.488)
Norm : 1.55240 (-0.177733 0.210119)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.86 using 59 PHA bins.
# Reduced chi-squared = 0.9800 for 57 degrees of freedom
# Null hypothesis probability = 5.179352e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.460e-07 1.475e-08
25- 50 2.370e-07 1.730e-08
50-150 3.221e-07 5.701e-08
15-150 7.051e-07 6.476e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.82019 (-0.88372 0.998092)
R1^2/D10^2 : 0.926544 (-0.418812 0.855054)
kT2 [keV] : 23.4510 (-4.81928 8.23349)
R2^2/D10^2 : 4.39693E-03 (-0.0028545 0.00606716)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.76 using 59 PHA bins.
# Reduced chi-squared = 0.8866 for 55 degrees of freedom
# Null hypothesis probability = 7.104298e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.608e-07 3.327e-08
25- 50 2.219e-07 4.397e-08
50-150 3.664e-07 1.420e-07
15-150 7.491e-07 2.156e-07
Peak spectrum fit
Power-law model
Time interval is from 0.428 sec. to 1.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98293 ( -0.255271 0.272934 )
Norm@50keV : 6.60011E-03 ( -0.00115607 0.00112023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.33 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.631113e-01
Photon flux (15-150 keV) in 1 sec: 0.982326 ( -0.136358 0.136432 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.08145e-08 ( -9.92164e-09 1.01712e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.428 sec. to 1.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57674 ( -1.21621 0.583584 )
Epeak [keV] : 44.6046 ( )
Norm@50keV : 1.12375E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.463216e-01
Photon flux (15-150 keV) in 1 sec: 0.966717 ( -0.141693 0.141503 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84907e-08 ( -1.09559e-08 1.15326e-08 ) ergs/cm2
Band function
Time interval is from 0.428 sec. to 1.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97822 ( -4.97822 -4.97822 )
beta : -2.01246 ( -0.299443 0.268226 )
Epeak [keV] : 18.0988 ( -18.0988 6.77052 )
Norm@50keV : 8603.42 ( -1186.27 9.95854e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.16 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 55 degrees of freedom
# Null hypothesis probability = 2.103270e-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] : 10.6036 (-1.71278 2.02545)
R^2/D10^2 : 0.362041 (-0.175831 0.347247)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.00 using 59 PHA bins.
# Reduced chi-squared = 1.316 for 57 degrees of freedom
# Null hypothesis probability = 5.517783e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.435e-09 2.301e-09
25- 50 2.273e-08 5.250e-09
50-150 1.402e-08 4.713e-09
15-150 4.519e-08 9.660e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.0291 (-24.4065 49.6122)
Norm : 4.81507 (-0.986253 1.26381)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.04 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.712331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.235e-08 2.329e-09
25- 50 1.966e-08 3.245e-09
50-150 2.526e-08 1.153e-08
15-150 5.727e-08 1.258e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.19766 (-1.68776 2.6006)
R1^2/D10^2 : 8.58257 (-7.22029 108.425)
kT2 [keV] : 15.6097 (-3.80897 8.26714)
R2^2/D10^2 : 6.76550E-02 (-0.0560874 0.147885)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.52 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 55 degrees of freedom
# Null hypothesis probability = 2.267377e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.324e-08 7.430e-09
25- 50 1.817e-08 9.475e-09
50-150 2.387e-08 1.457e-08
15-150 5.528e-08 2.883e-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: 1.95746 ( -0.133917 0.136902 )
Norm@50keV : 2.24746E-03 ( -0.000183531 0.000180831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9042 for 57 degrees of freedom
# Null hypothesis probability = 6.793818e-01
Photon flux (15-150 keV) in 36.38 sec: 0.330693 ( -0.0232016 0.0232541 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52615e-07 ( -5.88443e-08 5.95184e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95350 ( -0.494957 0.382185 )
Epeak [keV] : 502.300 ( )
Norm@50keV : 2.25918E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9203 for 56 degrees of freedom
# Null hypothesis probability = 6.442758e-01
Photon flux (15-150 keV) in 36.38 sec: 0.330593 ( -0.024143 0.023117 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52488e-07 ( -7.03116e-08 5.87901e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93878 ( -14.3913 -4.93878 )
beta : -2.03535 ( -0.160275 0.151288 )
Epeak [keV] : 20.9525 ( -7.48448 3.1949 )
Norm@50keV : 997.455 ( -67.898 7024.58 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.35 using 59 PHA bins.
# Reduced chi-squared = 0.8792 for 55 degrees of freedom
# Null hypothesis probability = 7.246865e-01
Photon flux (15-150 keV) in 36.38 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) = 2.24e-07
S(50-100 keV) = 2.30e-07
T90 vs. Hardness ratio plot
T90 = 29.0080000758171 sec.
Hardness ratio (energy fluence ratio) = 1.02679
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 0.936218
Count Ratio (50-100 keV) / (15-25 keV) = 0.51732
Mask shadow pattern
IMX = 2.784046720988066E-01, IMY = -4.414401037912250E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000
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:
-87.347400 -14.200000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.6602 -62.7702 2700.0 48.1 -132.9 -0.0001 -0.0 0.1 GX 301-2
244.9881 -15.6388 0.4 25.5 -18.5 2.8726 31.6 0.5 Sco X-1
256.1597 -37.7584 4.1 1.5 -52.3 -0.2670 -2.8 9.7 4U 1700-377
256.3816 -36.2786 8.2 2.5 -18.1 0.1279 1.4 9.0 GX 349+2
263.0226 -24.7347 347.4 14.4 30.5 -0.0030 -0.0 1.0 GX 1+4
264.5162 -44.4245 3.1 7.8 154.0 0.3172 3.7 9.8 4U 1735-44
268.3854 -1.3042 3.6 38.4 28.5 0.5190 3.2 9.0 SW J1753.5-0127
270.0956 -24.9783 13.9 17.0 52.5 0.0859 0.8 11.9 GX 5-1
270.3182 -25.8417 3.8 16.4 54.8 0.3106 3.1 6.0 GRS 1758-258
274.0112 -13.9767 4.5 28.3 46.1 0.3074 2.5 3.6 GX 17+2
275.9568 -30.3062 7.7 16.9 78.2 0.1501 1.5 4.0 H1820-303
285.0823 -25.0394 5.3 26.6 79.2 0.2739 2.2 7.6 HT1900.1-2455
262.9151 -33.9671 4.4 6.0 55.0 0.2314 2.6 8.8 GX 354-0
197.4304 -50.6573 2.1 43.5 -115.2 2.2595 5.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-14.200000 22.184000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.7377 -62.9156 5.4 48.0 -133.1 0.6472 2.1 9.0 GX 301-2
244.9268 -15.6843 2.8 25.5 -18.7 0.3214 4.2 4.0 Sco X-1
255.8996 -38.0089 8.5 1.6 -63.4 -0.0948 -1.3 10.7 4U 1700-377
256.6138 -36.3755 4.5 2.3 -15.2 0.1854 2.6 9.1 GX 349+2
263.0720 -24.7444 17.9 14.4 30.7 0.0474 0.6 3.4 GX 1+4
264.7484 -44.4558 819.6 7.9 153.2 0.0010 0.0 0.4 4U 1735-44
268.3366 -1.4595 96.6 38.2 28.5 0.0155 0.1 1.9 SW J1753.5-0127
270.1268 -25.1188 9.7 16.9 52.8 0.1013 1.2 8.9 GX 5-1
270.0920 -25.6482 0.0 16.4 53.8 0.0976 1.2 12.7 GRS 1758-258
274.1167 -13.9259 44.1 28.4 46.2 -0.0274 -0.3 9.3 GX 17+2
275.7003 -30.2879 0.0 16.8 77.7 0.1675 2.0 12.6 H1820-303
285.0859 -25.0480 5.4 26.6 79.2 -0.2221 -2.1 8.1 HT1900.1-2455
263.0389 -33.6700 12.9 6.3 54.0 -0.0656 -0.9 10.2 GX 354-0
257.1794 -22.7233 0.6 15.7 9.0 1.4665 19.2 ------ UNKNOWN
318.6393 -86.0513 2.3 49.7 -173.0 0.8309 4.9 ------ UNKNOWN
232.2167 10.3574 3.3 54.4 -20.2 0.8301 3.5 ------ UNKNOWN
225.4834 -10.2061 3.2 40.5 -42.9 0.4726 3.6 ------ UNKNOWN
157.1237 -76.5354 2.4 55.2 -152.3 1.4787 4.8 ------ UNKNOWN
205.8196 -46.2124 2.1 38.6 -107.4 1.0857 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
250.452610 962.592000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9792 -15.6395 0.2 22.6 -58.2 31.3352 55.5 0.0 Sco X-1
255.9225 -37.9437 58.2 16.2 -135.0 -0.0918 -0.2 6.7 4U 1700-377
256.2874 -36.5004 3.3 14.9 -132.4 1.6138 3.5 8.5 GX 349+2
263.0575 -24.7257 3.4 3.6 -78.0 1.6019 3.4 2.9 GX 1+4
264.7483 -44.2978 16.5 19.6 -163.1 0.3257 0.7 9.1 4U 1735-44
268.2874 -1.4384 3.2 23.4 15.3 1.6982 3.6 4.9 SW J1753.5-0127
270.2428 -25.1245 7.1 3.0 109.5 0.8285 1.6 3.5 GX 5-1
270.2996 -25.8977 4.3 3.2 123.4 1.4034 2.7 9.3 GRS 1758-258
274.0008 -14.0420 1.4 12.6 44.9 3.7994 8.3 0.4 GX 17+2
275.8607 -30.2697 4.0 9.6 139.0 1.3321 2.9 6.7 H1820-303
284.8752 -24.8205 67.4 16.2 106.0 -0.0883 -0.2 10.6 HT1900.1-2455
288.7698 10.9688 2.2 41.6 45.3 7.3470 5.3 2.2 GRS 1915+105
262.9551 -33.7403 4.1 9.6 -147.4 1.3852 2.8 5.9 GX 354-0
278.9068 9.4178 2.5 36.1 32.3 3.3401 4.6 ------ UNKNOWN
317.6969 -75.9491 4.2 56.9 179.1 10.1869 2.8 ------ UNKNOWN
254.8599 31.0255 3.3 57.0 -0.4 8.9417 3.5 ------ UNKNOWN
298.2055 -80.4641 3.5 57.2 -173.8 8.3717 3.3 ------ UNKNOWN
255.2456 -41.6292 2.2 19.5 -140.7 2.4753 5.2 ------ UNKNOWN
264.4983 -75.3105 3.6 50.6 -167.1 4.4438 3.3 ------ UNKNOWN
251.3996 -45.6171 2.1 24.3 -140.8 2.8093 5.4 ------ UNKNOWN
250.2803 -53.7272 1.8 31.5 -148.9 3.6834 6.5 ------ UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
Plot creation:
Sat May 30 18:47:07 EDT 2015