Gamma-ray Burst 080822B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 22 Aug 08 21:17:46 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     321376,   Seg_Num: 0
  GRB_RA:           63.495d {+04h 13m 59s} (J2000),
                    63.627d {+04h 14m 30s} (current),
                    62.735d {+04h 10m 56s} (1950)
  GRB_DEC:         +25.743d {+25d 44' 34"} (J2000),
                   +25.764d {+25d 45' 51"} (current),
                   +25.617d {+25d 37' 01"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       0 [cnts]    Image_Peak=1609 [image_cnts]
  TRIGGER_DUR:     64.000 [sec] 
  TRIGGER_INDEX:   20000     E_range: 15-50 keV
  BKG_INTEN:       0 [cnts]
  BKG_TIME:        0.00 SOD {00:00:00.00} UT
  BKG_DUR:         0 [sec]
  GRB_DATE:        14700 TJD;   235 DOY;   08/08/22
  GRB_TIME:        75772.96 SOD {21:02:52.96} UT
  GRB_PHI:          28.79 [deg]
  GRB_THETA:        21.69 [deg]
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    7.15 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +6  +1  -3  -5  +0 -10  +1 
  SUN_POSTN:       152.21d {+10h 08m 51s}  +11.43d {+11d 25' 30"}
  SUN_DIST:         83.81 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
  MOON_POSTN:       41.44d {+02h 45m 46s}  +21.55d {+21d 32' 46"}
  MOON_DIST:        20.73 [deg]
  MOON_ILLUM:      63 [%]
  GAL_COORDS:      170.04,-18.08 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       66.22,  4.47 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
  COMMENTS:        probably due to it occurring during a Malindi downlink session.  
  COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
  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 = 181.74,7.09 [deg].  
   
  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 22 Aug 08 21:18:16 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     321376,   Seg_Num: 0
  GRB_RA:           63.495d {+04h 13m 59s} (J2000),
                    63.627d {+04h 14m 30s} (current),
                    62.735d {+04h 10m 56s} (1950)
  GRB_DEC:         +25.743d {+25d 44' 34"} (J2000),
                   +25.764d {+25d 45' 51"} (current),
                   +25.617d {+25d 37' 01"} (1950)
  GRB_DATE:        14700 TJD;   235 DOY;   08/08/22
  GRB_TIME:        75772.96 SOD {21:02:52.96} UT
  TRIGGER_INDEX:   20000
  GRB_PHI:          28.79 [deg]
  GRB_THETA:        21.69 [deg]
  DELTA_TIME:      0.00 [sec]
  TRIGGER_DUR:     64.000 [sec] 
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    7.15 [sigma]
  LC_URL:          sw00321376000msb.lc
  SUN_POSTN:       152.21d {+10h 08m 52s}  +11.43d {+11d 25' 30"}
  SUN_DIST:         83.81 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
  MOON_POSTN:       41.45d {+02h 45m 47s}  +21.55d {+21d 32' 51"}
  MOON_DIST:        20.72 [deg]
  MOON_ILLUM:      63 [%]
  GAL_COORDS:      170.04,-18.08 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       66.22,  4.47 [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 an image 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 = 181.74,7.09 [deg].  
  

  
• GCN Circular #8117
  S. T. Holland (CRESST/USRA/GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), C. Pagani (PSU), D. M. Palmer (LANL), M. Perri (ASDC), B. Preger (ASDC), R. L. C. Starling (U Leicester) and G. Stratta (ASDC) report on behalf of the Swift Team:
  At 21:02:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080822 (trigger=321376). Swift did not slew to this burst because of the Moon observing constraint. It will come out of Moon constraint early 26 Aug 08 UT. The BAT on-board calculated location is RA, Dec 63.495, +25.743, which is

     RA(J2000)  =  04h 13m 59s
     Dec(J2000) = +25d 44' 34"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT TDRSS light curve does not show anything significant which is typical for an image trigger.
  Burst Advocate for this burst is S. T. Holland (sholland AT milkyway.gsfc.nasa.gov). 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 #8123
  MASTER-Net Team:
  D.Kuvshinov, V. Lipunov, V.Kornilov, E.Gorbovskoy, A.Belinski, N.Shatskiy, N.Tyurina, Sternberg Astronomical Institute, Moscow Union 'Optic'
  A. Tlatov, I.Golubov Kislovodsk Solar Station of the Pulkovo observatory
  V.Krushinski, I.Zalognikh Ural State University, Kourovka
  S.Yazev, K.Ivanov Irkutsk State University
  MASTER robotic Net (Moscow region, http://observ.pereplet.ru) responded to GRB080822B (Holland et al., GCN Circ 8117) by hand due to internet problem at the Moscow Region Site. The first image was started at 2008-08-22 21:21:35 UT, 18m 43s after the GRB time. The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B). The robot did not find OT-candidate in error box.
  T-Tgrb Mean Time Exposition Limit Coadd?
  1123 s 1138 s 30 s 17.0 no
  1123s 1692 s 25x30 s 18.8 yes
  The message can be cited.
• GCN Circular #8128
  G. Sato (ISAS), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+903 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080822B (trigger #321376) (Holland, et al., GCN Circ. 8117). The BAT ground-calculated position is RA, Dec = 63.560, 25.760 deg, which is

     RA(J2000)  =  04h 14m 14.5s 
     Dec(J2000) = +25d 45' 35.5" 
  

  with an uncertainty of 3.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%.
  The mask-weighted light curve shows weak emission starting around T-50 sec and ending around T+70 sec. T90 (15-350 keV) is 64 +- 20 sec (estimated error including systematics).
  The time-averaged spectrum from T+0.0 to T+64.0 sec is fit by a power law. This fit gives a photon index 2.54 +- 0.5. (chi squared 76.5 for 59 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.7 +- 0.6 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T+0.00 sec in the 15-150 keV band is 0.06 +- 0.02 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
  We note that this is a weak detection for BAT and that we can not rule out a non-burst explanation for this trigger.
• GCN Report 160.1
  GCN_Report 160.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_160_1.pdf by S.T. Holland at CRESST/USRA/GSFC titled: "Final Observations of Swift GRB 080822B"