GRB 200608A

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/)

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.

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
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 ) 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.

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
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 ).  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/