Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 21204

GRB 170604A: RATIR Optical and NIR Observations
2017-06-05T16:48:58Z (7 years ago)
Nat Butler at Az State U <>
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William
H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier
Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora
Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes��s
Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey Moseley (GSFC), John
Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:

We observed the field of GRB 170604A (Page, et al., GCN 21191) with the
Reionization and Transients Infrared Camera (RATIR; on the
1.5m Harold Johnson Telescope at the Observatorio Astron��mico Nacional on
Sierra San Pedro M��rtir from 2017/06 5.39 to 2017/06 5.45 UTC (14.19 to
15.70 hours after the BAT trigger), obtaining a total of 0.84 hours
exposure in the r and i bands and 0.42 hours exposure in the Z and Y bands.

For a source within the Swift-XRT error circle (Page, et al., GCN 21196),
in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following

  r = 20.42 +/- 0.06
  i = 20.65 +/- 0.07
  Z = 20.45 +/- 0.13
  Y = 20.40 +/- 0.30

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.

We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
Looking for U.S. government information and services? Visit