TO:  All GCN Notice recipients
RE:  Fermi-LAT_Ground Notice type is available
DT:  02 Aug 11


INTRODUCTION:

The GCN system has been modified to incorporate the distribution
of the Fermi-LAT "ground-processed" position notices.
Unlike the real-time Fermi-LAT notices (Update) that are generated on-board,
this notice type is the result of automated ground processing.
This automated processing (a) refines the position for on-board triggered events,
and (b) scans the total stream of LAT events applying trigger criteria
looking for bursts that did not trigger on-board.
All the processing to derive the position is automated;
there is no human involvement at this stage.

These will occur about less than 5 times per year.
The time delays for the LAT_GND are in the 6-24 hours range
(due to full data-set telemetry downlink delays).
The location uncertainties are in the 10-60 arcmin range.

This new notice type is available in all the formats and
distribution methods: socket-based (binary & XML VOEvent)
and email-based (full-format, the 4 shorter formats for cellphones
and pagers, and the XML VOEvent format).  All the filtering methods
are applicable to this notice type.


ACTION ITEM:
If, after reviewing the information below, you want to receive
these Fermi-LAT_GND Position notices, please send me a request
to have them enabled.  You can do this by forwarding this email to
scott@milkyway.gsfc.nasa.gov .
Or you can go to  http://gcn.gsfc.nasa.gov/gcn/config_builder.html
and select "#2 Modify an existing config".
You can also take this opportunity to make other changes to your config.


ARCHIVE STORAGE:
The GCN/FERMI Notices are archived within the GCN website
in the Table of FERMI GRBs:  http://gcn.gsfc.nasa.gov/gcn/fermi_grbs.html
This archives both the GBM Notice types and the LAT notice types.


MORE INFORMATION:
Can be found at: http://gcn.gsfc.nasa.gov/gcn/fermi.html


NOTICE EXAMPLE:
Here is an example of a full-format email LAT_GND Position Notice:

      TITLE:           GCN/FERMI NOTICE
      NOTICE_DATE:     Mon 19 Oct 09 14:16:48 UT
      NOTICE_TYPE:     Fermi-LAT Ground Position
      TRIGGER_NUM:     276237346
      GRB_RA:          250.760d {+16h 43m 02s} (J2000),
                       250.844d {+16h 43m 23s} (current),
                       250.327d {+16h 41m 18s} (1950)
      GRB_DEC:         +38.230d {+38d 13' 48"} (J2000),
                       +38.212d {+38d 12' 43"} (current),
                       +38.323d {+38d 19' 21"} (1950)
      GRB_ERROR:       40.00 [arcmin radius, statistical only]
      GRB_INTEN2:      10.3 [cnts] (0.1-1 GeV)
      GRB_INTEN3:      0.2 [cnts] ( 1-10 GeV)
      GRB_INTEN4:      0.0 [cnts] (10-up GeV)
      GRB_DATE:        15107 TJD;   276 DOY;   09/10/03
      GRB_TIME:        16543.00 SOD {04:35:43.00} UT
      GRB_PHI:         -95.16 [deg]
      GRB_THETA:        13.86 [deg]
      SIGNIFICANCE:    5.90 [sqrt(TS) 2 dof]
      SUN_POSTN:       204.42d {+13h 37m 40s}  -10.16d {-10d 09' 35"}
      SUN_DIST:         64.91 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
      MOON_POSTN:      219.36d {+14h 37m 26s}  -20.34d {-20d 20' 16"}
      MOON_DIST:        65.59 [deg]
      MOON_ILLUM:      2 [%]
      GAL_COORDS:      61.37, 40.82 [deg] galactic lon,lat of the burst (or transient)
      ECL_COORDS:      239.20, 59.63 [deg] ecliptic lon,lat of the burst (or transient)
      COMMENTS:        Fermi LAT Ground-Analysis position.
      COMMENTS:        This Notice was ground-generated -- not flight-generated.



The socket packets contents can be found at:
http://gcn.gsfc.nasa.gov/gcn/sock_pkt_def_doc.html




REMINDER OF RECENT ADDITIONS TO GCN:
In case you have missed them, here is a brief list of the most recent
additions to the GCN system.  You might consider signing up
for these Notice types as well.  The full anouncements/dscriptions
for each of these can be found at:  http://gcn.gsfc.nasa.gov/gcn/whats_new.html
MOA (01 Aug 2011)                 // Micro-lensing events from the MOA project
DOW_TOD  (13 Jun 2011)            // Preprogrammed notices at specific days-of-week & time-of-day
FERMI_GBM FIN_POS  (07 Jun 2011)  // Human-in-the-loop ground-based analysis
MAXI_UNKNOWN/_KNOWN (Apr 2011)    // Unknown transients & Flares-ups from Known sources
INTEGRAL_WEAK  (Feb 2011)         // Subthreshold detections by INTEGRAL
SWIFT_BAT_MONITOR (Feb 2010)      // Flare-ups from known sources monitored by Swift-BAT



Sincerely,
Scott

Scott Barthelmy                      NASA-GSFC, Code 661, Greenbelt, MD   20771
PHONE:  301-286-3106                 (office)       CELL:   301-346-3733
EMAIL:  scott@lheamail.gsfc.nasa.gov
PAGER:  3013463733@cingularme.com
WEB:    http://gcn.gsfc.nasa.gov/gcn