Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 1438

Gemini IR Detection of AXP 1E 2259+586 Post-Burst
2002-06-23T00:45:00Z (22 years ago)
Victoria M. Kaspi at McGill U/Physics <>
V. M. Kaspi (McGill University/Massachusetts Institute of
Technology), J. Jensen (Gemini), F. Rigaut (Gemini), A. Hatakeyama
(Gemini), P. M. Woods (USRA/NSSTC) report Gemini North 8-m near-IR
observations of the anomalous X-ray pulsar 1E 2259+586 field.  K_s band
data were obtained on June 21, 2002 at 14:44 UT using the NIRI
instrument and a 30-min exposure with seeing 0.7".  The reported
possible IR counterpart to the pulsar (Hulleman et al. 2000, A&A, 358,
605) was detected with preliminary magnitude 20.36 +/- 0.15, 1.34 mag
brighter than the quiescent value, indicating the source was 3.4 times
brighter (5.4 sigma c.l.) 3 days following the SGR-like X-ray bursts
detected with RXTE/PCA (IAUC 7924).  This confirms the IR
identification.  Further IR/optical monitoring is advised.

A preliminary Gemini/NIRI image can be found at Note that
the relative brightnesses of the pulsar counterpart and star 3 in the
Hulleman et al. K_s Keck image are reversed in the Gemini image,
demonstrating that the pulsar brightened.
Looking for U.S. government information and services? Visit