TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5142 SUBJECT: GRB 060505 BAT refined analysis DATE: 06/05/15 19:54:31 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift D. Hullinger (BYU-Idaho), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-2 to T+8 sec, we report further analysis of GRB 060505 (Palmer et al. GCN 5076). The refined ground-analysis position is RA, Dec 331.776d, -27.825d (22h 07m 06.3s, -27d 49' 31") +- 2.1 arcmin (J2000, estimated uncertainty, 90% containment). This position is 0.6 arcmin from the XRT refined position reported by Conciatore et al. in GCN 5081. The partial coding was 11%. As noted earlier, this was a ground-discovered burst that did not trigger the BAT instrument. Thus we have only a limited set of full-resolution data. The mask-weighted light curve shows a single rounded peak. T90 is 4 +- 1 sec (15-350 keV, estimated error including systematics). The BAT counting rates give no indication of extended emission. However, Swift was approaching the SAA and BAT entered SAA mode with even more limited data collection at T+60, so constraints on emission are poor. The time-averaged spectrum is well fit by a simple powerlaw with index 1.3 +- 0.3. The energy fluence in the 15-150 keV band is 6.2 +- 1.1 x 10^-7 ergs/cm2. The 1-second peak flux, also in the 15-150 keV band, from T+2 sec is 1.9 +- 0.3 ph/cm2/s. All the quoted errors are at the 90% confidence level.