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GCN Circular 24973

Subject

GRB 190701A, Swift-BAT refined analysis

Date

2019-07-03T14:11:50Z (5 years ago)

From

Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>

A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),  J. R. Cummings (CPI),
H. A. Krimm (NSF), C. B. Markwardt (GSFC), 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 190701A (trigger #912310)
(Ukwatta, et al., GCN Circ. 24934Loading...
 
 ).  The BAT ground-calculated position is
RA, Dec = 28.131, 58.899 deg which is 
  RA(J2000)  =  01h 52m 31.5s 
  Dec(J2000) = +58d 53' 56.9" 
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 52%.

The mask-weighted light curve shows a multi-peaked structure.  The main period
of emission includes three broad peaks between roughly T+0 sec and T+100 sec,
peaking about T+38 sec.  T90 (15-350 keV) is 52.4 +- 4.0 sec (estimated error
including systematics).

The time-averaged spectrum from T+35.0 to T+90.0 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.91 +- 0.27.  The fluence in the 15-150 keV band is 8.7 +- 1.5 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+37.92 sec in the 15-150 keV band
is 1.2 +- 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/912310/BA/