GRB 220530***A***: Swift-BAT refined analysis
 
<somebody goes first>
<add the BA alphabetically>
S. D. Barthelmy (GSFC), 
H. A. Krimm (NSF),
S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC),
D. M. Palmer (LANL),
T. Parsotan (GSFC/UMBC),
T. Sakamoto (AGU),
M. Stamatikos (OSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 220530***A*** (trigger #1108538)
(NAME, et al., GCN Circ. xxxx).  The BAT ground-calculated position is
RA, Dec = 293.726, 21.892 deg which is 
   RA(J2000)  =  19h 34m 54.3s 
   Dec(J2000) = +21d 53' 30.0" 
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 86%.
 
[Description about the mask-weighted light curve]
T90 (15-350 keV) is 0.11 +- 0.02 sec (estimated error including systematics).
 
The time-averaged spectrum from T-0.17 to T+0.11 sec fit by a simple
power-law model shows the power law index of 3.03 +- 0.00 (chi squared 415.51 for 57 d.o.f.).
The fluence in the 15-150 keV band is 7.9 +- 0.0 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T-0.53 sec in the 15-150 keV band
is 18.1 +- 0.0 ph/cm2/sec.
 
A single blackbody fit to the time-averaged spectrum shows the blackbody
temperature of 8.49 +- 0.00 keV (chi squared 119.79 for 57 d.o.f.).
A thermal bremsstrahlung model fit shows the temperature of 28.20 +- 1.28 keV
(chi squared 99.35 for 57 d.o.f.).  A double blackbody fit shows the lower temperature
of 5.80 +0.74 keV and the higher temperature of 11.69 +1.22 keV
(chi squared 60.85 for 55 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/1108538/BA/