{
  "bibcode": "2009GCN..9137....1B",
  "body": "J. S. Bloom (UC Berkeley), D. Fox (PSU), N. R. Tanvir, P. T. O'Brien  \n(U. Leicester), William Lee (UNAM), J. X. Prochaska (UCO/Lick) report:\n\nWe further note that the galaxy possibly associated (Fox GCN 9134)  \nwith GRB 090417A (Mangano et al., GCN 9133) appears both visually and  \nspectrally to be of an early-type (smooth morphology, prominent Ca  \nH&K). In the 6df spectrum (O'Brien & Tanvir, GCN 9136), there is some  \nlow-level H�� emission apparent suggesting some low-level star- \nformation. However no other Balmer lines appear prominently detected  \nand there is no apparent [OIII] or [OII] as seen in the host galaxies  \nof essentially all long-soft GRB (LSB) hosts. Without a detailed  \nanalysis, we classify this galaxy as a S0/lenticular or (more likely)  \nan elliptical. Given the connection of several other SHBs to  \nellipticals at moderate redshift, we feel this identification can be  \ntaken as weak observational support for a connection between this  \ngalaxy and 090417A and further suggests that the burst was unlikely to  \nbe due to an SGR flare-type event (O'Brien & Tanvir, GCN 9136). The  \nfact that the galaxy is at the edge of the BAT error circle does not  \nnecessarily argue against it being the host: the offset from the  \ncenter of the circle, which amounts  to ~320 kpc at this redshift, is  \ncertainly within the range of plausible natal kicks of a compact  \nbinary progenitor (~1 Gyr merger time for a 500 km/s kick).",
  "circularId": 9137,
  "createdOn": 1239989729000,
  "email": "jbloom@astron.berkeley.edu",
  "subject": "GRB 090417A: Early-type nature of the putative host",
  "submitter": "Josh Bloom at UC Berkeley  <jbloom@astron.berkeley.edu>",
  "eventId": "GRB 090417A"
}