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 16748

GRB 140818B: TLS observations
2014-08-27T09:23:17Z (10 years ago)
Sebastian Schmidl at TLS Tautenburg <>
S. Schmidl, S. Klose, D. A. Kann, U. Laux, L. Pfeifer, C. Pohl, and H.
Meusinger (all TLS Tautenburg) report:

We observed the field of GRB 140818B (Swift trigger 609885, Vargas et al.,
GCN 16709) with the 1.34m Tautenburg Schmidt telescope.

Starting at 20:34 UT (1.83 hr after the trigger), we obtained in total 12
x 120s Rc-band images. Observations were obtained at a mean airmass of 1.75.

In a stack of all available images, we detect the source reported by
Aceituno et al. (GCN 16711). Using USNO-B1 field stars for calibration, we
derive a preliminary magnitude (Vega magnitude system) of

Rc = 20.9 +/- 0.2,

at a midtime of 2.08 hr after the burst.

The given magnitude is not corrected for the large Galactic foreground
extinction corresponding to a reddening of E_(B-V) = 0.73 mag in the
direction of the burst (Schlegel et al. 1998).
Looking for U.S. government information and services? Visit