TITLE:   GCN CIRCULAR
NUMBER:  36140
SUBJECT: GRB 240414A: Swift-BAT refined analysis
DATE:    24/04/16 19:56:23 GMT
FROM:    Mike Moss at NASA GSFC <mikejmoss3@gmail.com>

C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),
R. Caputo (GSFC), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
M. J. Moss (GSFC), D. M. Palmer (LANL),
T. Parsotan (GSFC), T. Sakamoto (AGU)
(i.e. the Swift-BAT team):
 
Using the data set from T-61 to T+199 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 240414A (trigger #1221714)
(Caputo, et al., GCN Circ. 36083).  The BAT ground-calculated position is
RA, Dec = 184.781, 56.734 deg which is
   RA(J2000)  =  12h 19m 07.5s
   Dec(J2000) = +56d 44' 03.0"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 91%.
 
The mask-weighted light curve shows multiple pulses starting at T0-35 s through
T0+40 s, with another pulse at T0+110 s. There may be additional emission prior 
to the currently available data starting from ~T0-61 s.
T90 (15-350 keV) is 88.28 +- 50.41 sec (estimated error including systematics).
 
The time-averaged spectrum from TTBD to TTBD sec is best fit by a power law
with an exponential cutoff.  This fit gives a photon index 0.99 +- 0.36,
and Epeak of 97.0 +- 62.5 keV (chi squared 46.83 for 56 d.o.f.).  For this
model the total fluence in the 15-150 keV band is 3.5 +- 0.2 x 10^-06 erg/cm2
and the 1-sec peak flux measured from T+2.04 sec in the 15-150 keV band is
1.5 +- 0.2 ph/cm2/sec.  A fit to a simple power law gives a photon index
of 1.49 +- 0.08 (chi squared 53.19 for 57 d.o.f.).  All the quoted errors
are at the 90% confidence level.
 
The results of the batgrbproduct analysis are available at
https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1221714