Gamma-ray Burst 080915B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Mon 15 Sep 08 15:53:48 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     324805,   Seg_Num: 0
  GRB_RA:          213.078d {+14h 12m 19s} (J2000),
                   213.195d {+14h 12m 47s} (current),
                   212.408d {+14h 09m 38s} (1950)
  GRB_DEC:         -11.473d {-11d 28' 23"} (J2000),
                   -11.514d {-11d 30' 49"} (current),
                   -11.239d {-11d 14' 20"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       1608 [cnts]    Image_Peak=162 [image_cnts]
  TRIGGER_DUR:     0.128 [sec] 
  TRIGGER_INDEX:   119     E_range: 15-50 keV
  BKG_INTEN:       56219 [cnts]
  BKG_TIME:        57204.90 SOD {15:53:24.90} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        14724 TJD;   259 DOY;   08/09/15
  GRB_TIME:        57215.14 SOD {15:53:35.14} UT
  GRB_PHI:         -26.13 [deg]
  GRB_THETA:        32.33 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     23.47 [sigma]
  IMAGE_SIGNIF:    10.57 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +0  +1 +21 -100  +0 -74  +1 
  SUN_POSTN:       173.73d {+11h 34m 55s}   +2.71d {+02d 42' 40"}
  SUN_DIST:         41.74 [deg]   Sun_angle= -2.6 [hr] (East of Sun)
  MOON_POSTN:      355.71d {+23h 42m 50s}   +1.56d {+01d 33' 32"}
  MOON_DIST:       141.50 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      332.53, 46.70 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      214.76,  1.73 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 1.70,-16.27 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Mon 15 Sep 08 16:00:16 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     324805,   Seg_Num: 0
  GRB_RA:          213.078d {+14h 12m 19s} (J2000),
                   213.195d {+14h 12m 47s} (current),
                   212.408d {+14h 09m 38s} (1950)
  GRB_DEC:         -11.473d {-11d 28' 23"} (J2000),
                   -11.514d {-11d 30' 49"} (current),
                   -11.239d {-11d 14' 20"} (1950)
  GRB_DATE:        14724 TJD;   259 DOY;   08/09/15
  GRB_TIME:        57215.14 SOD {15:53:35.14} UT
  TRIGGER_INDEX:   119
  GRB_PHI:         -26.13 [deg]
  GRB_THETA:        32.33 [deg]
  DELTA_TIME:      320.00 [sec]
  TRIGGER_DUR:     0.128 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     23.47 [sigma]
  IMAGE_SIGNIF:    10.57 [sigma]
  LC_URL:          sw00324805000msb.lc
  SUN_POSTN:       173.73d {+11h 34m 56s}   +2.71d {+02d 42' 34"}
  SUN_DIST:         41.74 [deg]   Sun_angle= -2.6 [hr] (East of Sun)
  MOON_POSTN:      355.76d {+23h 43m 03s}   +1.59d {+01d 35' 14"}
  MOON_DIST:       141.56 [deg]
  MOON_ILLUM:      100 [%]
  GAL_COORDS:      332.53, 46.70 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      214.76,  1.73 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Lightcurve.  
  COMMENTS:           
  COMMENTS:        The next comments were copied from the BAT_POS Notice:  
  COMMENTS:        This is a rate trigger.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the on-board catalog.  
  COMMENTS:        This does not match any source in the ground catalog.  
  COMMENTS:        This is a GRB.  
  COMMENTS:        This trigger occurred at longitude,latitude = 1.70,-16.27 [deg].  
  COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.  
  

  
• GCN Circular #8234
  H. Ziaeepour (UCL-MSSL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), J. Mao (INAF-OAB), P. T. O'Brien (U Leicester), S. R. Oates (UCL-MSSL), J. P. Osborne (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), D. Perez (U Leicester), M. Perri (ASDC), T. Sakamoto (NASA/UMBC), R. L. C. Starling (U Leicester), G. Stratta (ASDC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
  At 15:53:35 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080915B (trigger=324805). The BAT on-board calculated location is RA, Dec 213.078, -11.473 which is

     RA(J2000) = 14h 12m 19s
     Dec(J2000) = -11d 28' 23"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single FRED peak structure with a duration of about 5 sec. The peak count rate was ~13,000 counts/sec (15-350 keV), at ~0 sec after the trigger.
  Due to the Solar observing constraint, Swift cannot slew to the BAT position until mid-December. There will thus be no XRT or UVOT data for this trigger.
  Burst Advocate for this burst is H. Ziaeepour (hz AT mssl.ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
• GCN Circular #8236
  K. McLean (GSFC/UMD), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU), H. Ziaeepour (UCL-MSSL) (i.e. the Swift-BAT team):
  Using the data set from T-28 to T+930 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080915B (trigger #324805) (Ziaeepour, et al., GCN Circ. 8234). The BAT ground-calculated position is RA, Dec = 213.088, -11.491 deg, which is

     RA(J2000)  =  14h 12m 21.2s 
     Dec(J2000) = -11d 29' 26.9" 
  

  with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 74%.
  The mask-weighted light curve shows a roughly symmetric peak starting at ~T-0.5 sec, peaking at ~T+0.6 sec, and ending at ~T+4.5 sec. T90 (15-350 keV) is 3.9 +- 0.7 sec (estimated error including systematics).
  The time-averaged spectrum from T-0.5 to T+6.1 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.48 +- 0.35, and Epeak of 42.3 +- 9.1 keV (chi squared 54.5 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 9.9 +- 0.6 x 10^-7 erg/cm2 and the 1-sec peak flux measured from T+0.18 sec in the 15-150 keV band is 8.5 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.02 +- 0.08 (chi squared 62.6 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
  The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/324805/BA/
• GCN Report 163.1
  GCN_Report 163.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_163_1.pdf by H. Ziaeepour at UCL/MSSL titled: "Final observations of Swift GRB 080915B"