GRB 190512A

The Fermi GBM team reports the detection of a likely LONG GRB

At 14:39:59 UT on 12 May 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190512A (trigger 579364804.721872 / 190512611).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 80.3, Dec = -10.7 (J2000 degrees, equivalent to J2000 05h 21m, -10d 41'), with a statistical uncertainty of 3.0 degrees.

The angle from the Fermi LAT boresight is 25.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190512611/quicklook/glg_skymap_all_bn190512611.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190512611/quicklook/glg_healpix_all_bn190512611.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190512611/quicklook/glg_lc_medres34_bn190512611.gif

M. G. Bernardini (INAF-OAB), J. A. Kennea (PSU),
H. A. Krimm (NSF/USRA), A. Melandri (INAF-OAB),
K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (PSU) and
A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift
Observatory Team:

At 14:40:09 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 190512A (trigger=903357).  The BAT on-board calculated location is 
RA, Dec 82.440, -7.574 which is 
   RA(J2000) = 05h 29m 46s
   Dec(J2000) = -07d 34' 25"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a FRED-profile
structure with a duration of about 30 sec.  The peak count rate
was ~1000 counts/sec (15-350 keV), at ~6 sec after the trigger. 

Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 18:41 UT on 2019 July 21. There will thus be no XRT or
UVOT data for this trigger before this time. 

Burst Advocate for this burst is M. G. Bernardini (grazia.bernardini AT brera.inaf.it). 
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/)

C. Fletcher (USRA) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:

"At 14:39:59.72 UT on 12 May 2019, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 190512A (trigger 579364804 / 190512611)
which was also detected by the Swift/BAT
(Bernardini et al. 2019, GCN 24501
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 )
The GBM on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger time is 24 degrees.

The GBM light curve consists of a single peak
with a duration (T90) of about 28 s (50-300 keV).
The time-averaged spectrum from T0-4.1 s to T0+27.7 s is
best fit by a power law function with an exponential
high-energy cutoff.  The power law index is -1.4 +/- 0.2 and
the cutoff energy, parameterized as Epeak, is 110 +/- 25 keV

The event fluence (10-1000 keV) in this time interval is
(2.4 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+3.13 s in the 10-1000 keV band
is 2.0 +/- 0.3 ph/s/cm^2."

The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html

For Fermi GBM data and info,
please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/

J. R. Cummings (CPI), S. D. Barthelmy (GSFC),  M. G. Bernardini (INAF-OAB),
H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), 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 190512A (trigger #903357)
(Bernardini, et al., GCN Circ. 24501
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 ).  The BAT ground-calculated position is
RA, Dec = 82.402, -7.582 deg which is 
  RA(J2000)  =  05h 29m 36.5s 
  Dec(J2000) = -07d 34' 56.1" 
with an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 83%.

The mask-weighted light curve shows a single FRED-shaped profile, starting at
T-12 sec, peaking close to T+0 sec, and slowly decaying to background by 
T+50 sec.  T90 (15-350 keV) is 40.1 +- 11.3 sec (estimated error including systematics).

The time-averaged spectrum from T-9.70 to T+43.31 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.07 +- 0.14.  The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-2.78 sec in the 15-150 keV band
is 1.0 +- 0.2 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/903357/BA/