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GCN Circular 14398

Subject

GRB 130327B: Swift/XRT source is not the afterglow

Date

2013-04-19T20:11:29Z (11 years ago)

From

Hans Krimm at NASA-GSFC <hans.krimm@nasa.gov>

H. A. Krimm (CRESST/GSFC/USRA) and E. Troja (NASA/GSFC/CRESST) for the Swift team:

Swift carried out an additional 4.6 ksec observation of the field containing GRB 
130327B (e.g. Longo et al, GCN 14344Not found
 
 
; Ohno et al, GCN 14347Not found
 
 
), starting at 
2013-04-18 12:43:13 UT, approximately 22 days after the burst.  The source 
reported in Krimm & Mangano (GCN 14353Not found
 
 
) as a possible afterglow to GRB 130327B 
is still detected at a rate of 0.002 � 0.001 cts/s (0.3-10 keV), which is 
statistically consistent with the rate reported in GCN 14353Not found
 
 
.  Since we would 
expect a GRB afterglow to have faded over this time period, we conclude that the 
XRT source is not associated with GRB 130327B, and is instead a background 
source, possibly an AGN.
	No further Swift observations are planned.