{
  "bibcode": "2011GCN.11853....1L",
  "body": "A.J. Levan (U. Warwick), D. Perley (U.C. Berkeley), N.R. Tanvir (U.\nLeicester), J. Bloom, S.B. Cenko (U.C. Berkeley) report for a larger\ncollaboration:\n\n\"We re-observed the localization of GRB 110328A with Gemini-N/NIRI\non 31 March 2011. Observations were taken in the K-band, and began\nat 13:15UT, roughly 24 hours after our previous observation (Levan\net al. GCN 11846). We find that the IR source, coincident\nwith the X-ray (Osborne et al. GCN 11826) and radio (Zauderer et\nal. GCN 11848) localisations has faded by 0.25 +/- 0.03 magnitudes\nover this time frame. Hence we conclude that the IR light does\ncontain a substantial contribution from transient emission. We note\nthat the apparent brightening of the source in a few hours between the\nobservations of Morgan et al. (GCN 11845) and Gemini (GCN 11846),\ncoupled with the fading over the subsequent 24 hours, suggests that\nthe behaviour of the system is complex, and as in the X-ray, is not\nsimply modelled by either a rising, or decaying lightcurve.\n\nThe location of the source is consistent with the galaxy\nobserved in the optical with a measured redshift z=0.351,\n(Levan et al. GCN 11833, Thoene et al. GCN 11834) hence\nincreasing the confidence in a true association.\n\nFurther observations are planned.\"",
  "circularId": 11853,
  "createdOn": 1301595579000,
  "email": "A.J.Levan@warwick.ac.uk",
  "subject": "GRB 110328A / Swift J164449.3+573451: Infrared transient",
  "submitter": "Andrew Levan at U.of Leicester  <A.J.Levan@warwick.ac.uk>",
  "eventId": "GRB 110328A"
}