Gamma-ray Burst 200608A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Mon 08 Jun 20 17:29:53 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     976692,   Seg_Num: 0
  GRB_RA:          309.629d {+20h 38m 31s} (J2000),
                   309.943d {+20h 39m 46s} (current),
                   308.857d {+20h 35m 26s} (1950)
  GRB_DEC:         -31.168d {-31d 10' 05"} (J2000),
                   -31.095d {-31d 05' 42"} (current),
                   -31.344d {-31d 20' 39"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       0 [cnts]    Image_Peak=1639 [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:        19008 TJD;   160 DOY;   20/06/08
  GRB_TIME:        62918.91 SOD {17:28:38.91} UT
  GRB_PHI:         -145.38 [deg]
  GRB_THETA:        35.72 [deg]
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    8.43 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  -5  +0 +68  +0 
  SUN_POSTN:        77.36d {+05h 09m 27s}  +22.93d {+22d 55' 39"}
  SUN_DIST:        132.88 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
  MOON_POSTN:      298.48d {+19h 53m 55s}  -23.32d {-23d 19' 17"}
  MOON_DIST:        12.81 [deg]
  MOON_ILLUM:      90 [%]
  GAL_COORDS:       12.48,-35.38 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      303.95,-12.28 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT GRB Coordinates.  
  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 = 137.31,-11.16 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Mon 08 Jun 20 17:33:18 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     976692,   Seg_Num: 0
  GRB_RA:          309.629d {+20h 38m 31s} (J2000),
                   309.943d {+20h 39m 46s} (current),
                   308.857d {+20h 35m 26s} (1950)
  GRB_DEC:         -31.168d {-31d 10' 05"} (J2000),
                   -31.095d {-31d 05' 42"} (current),
                   -31.344d {-31d 20' 39"} (1950)
  GRB_DATE:        19008 TJD;   160 DOY;   20/06/08
  GRB_TIME:        62918.91 SOD {17:28:38.91} UT
  TRIGGER_INDEX:   20000
  GRB_PHI:         -145.38 [deg]
  GRB_THETA:        35.72 [deg]
  DELTA_TIME:      0.00 [sec]
  TRIGGER_DUR:     64.000 [sec] 
  SOLN_STATUS:     0x13
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    8.43 [sigma]
  LC_URL:          sw00976692000msb.lc
  SUN_POSTN:        77.36d {+05h 09m 27s}  +22.93d {+22d 55' 39"}
  SUN_DIST:        132.88 [deg]   Sun_angle= 8.5 [hr] (West of Sun)
  MOON_POSTN:      298.52d {+19h 54m 04s}  -23.32d {-23d 19' 04"}
  MOON_DIST:        12.78 [deg]
  MOON_ILLUM:      90 [%]
  GAL_COORDS:       12.48,-35.38 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      303.95,-12.28 [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 = 137.31,-11.16 [deg].  
  

  
• GCN Circular #27906
  M. J. Moss (GWU), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), J. A. Kennea (PSU), N. J. Klingler (PSU), S. Laha (GSFC/UMBC/CRESST), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and T. Sbarrato (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 17:28:38 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200608A (trigger=976692). Swift did not slew due to an observing constraint. The BAT on-board calculated location is RA, Dec 309.629, -31.168 which is

     RA(J2000) = 20h 38m 31s
     Dec(J2000) = -31d 10' 05"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 90 sec. However, we can not rule out the possibility that some of these variations are from other sources in the field of view until further ground analysis. The peak count rate was ~400 counts/sec (15-350 keV), at ~20 sec after the trigger.
  Due to a Moon observing constraint, Swift cannot slew to the BAT position until 01:24 UT on 2020 June 11. There will thus be no XRT or UVOT data for this trigger before this time.
  Burst Advocate for this burst is M. J. Moss (mikejmoss3 AT gmail.com). 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/)
• GCN Circular #27907
  Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado (IAA-CSIC), I. Carrasco and C. Perez del Pulgar (Univ. de Malaga), M. D. Caballero-Garcia (ASU-CAS, CZ), R. Querel (NIWA), D. Xiong, Y. Fan, X. Zhao, J. Bai, C. Wang, Y. Xin (Yunnan Observatories of CAS), on behalf of a larger collaboration, report:
  The 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New Zealand) responded to the Swift trigger of GRB 200608A (Moss et al. GCNC 27906). The first image (clear filter) was obtained at 19:18:40 UT (~ 1.83 hr after trigger). In the co-added image (5 exposures 30s each), no source is found at the region reported by Swift/BAT (Moss et al. GCNC 27906) down to 17.4 mag.
  The 60cm BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) also gathered images starting at 19:32:24 UT (~ 2.06 hr after trigger). No optical afterglow is found down to 18.1 mag (unfiltered images) within the Swift/BAT error box.
  Both observations were severely affected by the presence of the moon about 13 degrees away. We thank the staff at NIWA and YNO for their excellent support.
• GCN Circular #27908
  V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
  R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
  H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
  R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
  D. Buckley (South African Astronomical Observatory),
  O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
  A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
  V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
  MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 200608A ( M. J. Moss et al., GCN 27906) errorbox 7027 sec after notice time and 7103 sec after trigger time at 2020-06-08 19:27:01 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 82 deg. The sun altitude is -47.0 deg.
  The galactic latitude b = -36 deg., longitude l = 13 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1376906
  We obtain a following upper limits.

  Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____|_______|______|________
  
  
      7193 |         MASTER-SAAO |   C |   180 | 14.9 |        
     17386 |         MASTER-SAAO |   C |   180 | 18.0 |        
  

  Filter C is a clear (unfiltred) band.
  The observation and reduction will continue. The message may be cited.
• GCN Circular #27913
  A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC), M. J. Moss (GWU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200608A (trigger #976692) (Moss et al., GCN Circ. 27906). The BAT ground-calculated position is RA, Dec = 309.628, -31.194 deg which is

     RA(J2000)  =  20h 38m 30.7s
     Dec(J2000) = -31d 11' 39.4"
  

  with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 53%.
  The mask-weighted light curve shows several overlapping pulses that start at ~T+20 s and ends at ~T+150 s. The two main peaks occur at ~T+18 s and ~T+70 s, respectively. There may be an additional weak pulse at ~T-100 s. T90 (15-350 keV) is 119.2 +- 34.7 sec (estimated error including systematics).
  The time-averaged spectrum from T+18.09 to T+147.94 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.05 +- 0.22. The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+70.29 sec in the 15-150 keV band is 0.7 +- 0.3 ph/cm2/sec. 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/976692/BA/