STARITHM
Brightening of HMXB LS V +44 17 detected by Einstein Probe WXT
AI Summary
The Einstein Probe WXT detected a significant brightening of the HMXB LS V +44 17 with a net count rate of 0.14 counts/s in the 0.5-4 keV band, indicating an order of magnitude flux increase. Follow-up observations with FXT confirmed the brightening.
Measurements
| Event | EP-WXT detected a brightening of HMXB LS V +44 17 |
|---|---|
| Event ID | 01709318523 |
| Source | Einstein Probe WXT |
| Alert type | XRAY |
| Significance | high |
| Trigger time (UTC) | Sun, 20 Sep 2026 15:53:04 GMT |
| Right ascension (J2000) | 70.241° |
| Declination (J2000) | 44.538° |
| Position error radius | 0.05° (3.0′) |
| Position from | EP-WXT position, GCN 45661 |
| Net count rate | 0.14 |
| Image SNR | 16.7 |
| GCN notices | 1 |
| GCN circulars | 1 |
Every localisation reported in Circulars (1)
| Instrument | Of | Error | Circular |
|---|---|---|---|
| EP-WXT | burst | 3.0′ (90%) | GCN 45661 |
Observations (2)
Values parsed from the Circular text; each row names its Circular.
| Time since trigger | Band | Value | Telescope | Circular |
|---|---|---|---|---|
| — | 0.5-4 keV | 1.40e-10 erg/cm2/s | Einstein Probe (EP) | GCN 45661 |
| — | 0.5-10 keV | 3.10e-10 erg/cm2/s | Einstein Probe (EP) | GCN 45661 |
Notices (1)
Einstein Probe WXT — XRAY · Sun, 20 Sep 2026 15:53:04 GMT
GCN Circulars (1)
GCN-45661 — EP-WXT detected a brightening of HMXB LS V +44 17
· Sun, 20 Sep 2026 18:02:54 GMT
The Einstein Probe's Wide-field X-ray Telescope (WXT) detected a significant brightening of the High Mass X-ray Binary (HMXB) LS V +44 17, with an estimated flux increase of an order of magnitude. A follow-up observation confirmed the brightening, with the source's position consistent with LS V +44 17.
AI summary generated Sun, 20 Sep 2026 23:26:20 GMT.