GCN Circular 16091

Owen Littlejohns (ASU), Nat Butler (ASU), Alan M. Watson (UNAM),
Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer
(UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska
(UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora
Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos� A. de Diego (UNAM),
Leonid Georgiev (UNAM), Jes�s Gonz�lez (UNAM), Carlos Rom�n-Z��iga
(UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:

We observed the field of GRB 140408A (D'Elia, et al., GCN 16082
Not found
 
 
) with
the Reionization and Transients Infrared Camera (RATIR; www.ratir.org)
on the 1.5m Harold Johnson Telescope at the Observatorio Astron�mico
Nacional on Sierra San Pedro M�rtir from 2014/04 9.41 to 2014/04 9.48
UTC (20.52 to 22.37 hours after the BAT trigger), obtaining a total of
1.42 hours exposure in the r and i bands.

For a source within the Swift-XRT error circle we obtain the following
upper limits (3-sigma):

  r     > 22.84
  i     > 22.53

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB. These upper limits are consistent
with the previously reported GROND afterglow candidate (Varela, et al.,
GCN 16089
Not found
 
 
).

We thank the staff of the Observatorio Astron�mico Nacional in San Pedro
M�rtir.