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GRB 120624B: Swift-XRT observations
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SOURCE: GCN
TITLE: GCN CIRCULAR
NUMBER: 13394
SUBJECT: GRB 120624B: Swift-XRT observations
DATE: 12/06/28 10:24:28 GMT
FROM: Owen Littlejohns at U of Leicester <oml2@le.ac.uk>

O.M. Littlejohns, P.A. Evans, K.L. Page (U. Leicester), A. Melandri, P. D'Avanzo (INAF-OAB) and J.Racusin (GSFC) reports on behalf of the Swift-XRT team:

We have analysed 10 ks of XRT data for GRB 120624B (Barthelmy et al. GCN 13381), from 218.7 ks to 260.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. Inside the BAT refined error circle (Sakamoto et al. GCN 13384) we find an uncatalogued X-ray source (S1) at RA, Dec = 170.8845, +8.9283 which is equivalent to: RA (J2000): 11 23 32.28 Dec(J2000): +08 55 42.0 with an uncertainty of 4.3 arcsec (radius, 90% confidence). This source lies 40 arcsec from the NIR object reported by D'Avanzo et al. (GCN 13391). We cannot determine at the present time whether the source is fading, the count-rate is approximately 2e-3 ct/sec in XRT. There is a second source (S2) at RA, Dec = 170.8670, +8.9319 which is equivalent to: RA (J2000): 11 23 28.07 Dec(J2000): +08 55 54.8 with an uncertainty of 4.2 arcsec (radius, 90% confidence). This source is 70 arcsec away from the BAT refined position, just outside the error circle. This source is 35 arcsec from the NIR counterpart. This source has a count-rate of approximately 1e-3 ct/sec, and again we cannot measure variability at this time. An image of the XRT field, with the two XRT sources, BAT error circle and NIR source marked, is available at http://www.swift.ac.uk/products/GRB120624B.png Further observations are planned. This circular is an official product of the Swift-XRT team.

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