GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
579 results found.
- IBAS GRB Alert 1694
- IBAS GRB alerts 1679, 1680, 1681
- IBAS results on a burst from SGR1806-20
- IBAS alert 1180 refers to a burst from SGR 1806-20
- Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
- SGR1806-20 bursts on 031008. Helicon detection and small error box.
- SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
- A burst from SGR 1806-20 detected with IBAS
- IPN triangulation of GRB030926 (short/hard; large error box)
- IBAS detection of bursts from SGR 1806-20
- Radio Observations of SGR1806-20
- INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
- Summary of recent IPN and HETE detections of SGR bursts
- Clarification of GCN 2354 on SGR1806-20
- IPN detection of continued activity from SGR1806-20
- 030813 SGR event (Konus-Wind observation)
- SGR 1808-20 (=H2802): A Possible new SGR
- SGR 1806-20, submm observations
- RXTE PCA Observations of SGR1806-20 Region
- HETE detection of burst from SGR1806-20
- GRB030329 observed as a sudden ionospheric disturbance (SID)
- IPN triangulation of GRB021219
- IPN detection of continued activity from SGR1806-20
- IPN detection of renewed activity from SGR1806-20
- IPN detection of continued SGR1900+14 activity
- IPN confirmation of the reactivation of SGR1900+14
- IPN detection of possible reactivation of SGR1900+14
- IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
- SGR1900+14 activity, November 2-4, 2002
- Detection of activity from SGR 1900+14 with the RXTE/PCA
- IPN detection of a burst from SGR1900+14
- Gemini IR Detection of AXP 1E 2259+586 Post-Burst
- SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
- AXP 1E2259+586: quasi-simultaneous optical observation
- AXP 1E2259+586 optical observations
- SGR-like Bursts from the AXP 1E 2259+586
- IPN detection of possible bursts from SGR1806-20
- XRF 020427: Sudden Ionospheric Disturbance (SID)
- Mars Odyssey joins the IPN
- IPN detection and localization of Cygnus X-1 flares
- RXTE Observations of SGR 1900+14
- SGR1900+14 activity
- IPN/HETE Detection of Bursts from SGR1900+14
- IPN detection of further activity from SGR1806-20
- Optical observation of SGR 1806-20 at the 6-m SAO telescope
- Probable SGR or Short Duration GRB Detected by HETE
- Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
- Possible burst from SGR1806-20
- IPN detection of SGR1900+14
- X-ray precursors to the large flare from SGR 1900+14
- SGR 1900+14: No evidence of extended X-ray emission
- SGR 1900+14 : RXTE observations
- BeppoSAX/NFI Follow-up Observation of SGR 1900+14
- SGR1900+14
- SGR 1900+14: Correction to GCN 1049
- Millimeter observation of SGR 1900+14
- SGR 1900+14: Detection of extended X-ray emission
- Chandra Observations of SGR 1900+14
- SGR 1900+14, Chandra observations
- Chandra Observations of SGR 1900+14
- SGR1900+14, I-band observations
- SGR 1806-20 burst activity
- BATSE GRB trigger criteria
- X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
- GRB990308 not a new SGR
- GRB990308, Possible new SGR~0209+70
- SGR1900+14, BeppoSAX-GRBM observations
- SGR1627-41
- SGR1627-41, RXTE/ASM observations
- Reduced error box of SGR 1627-41
- SGR 1627-41
- Discovery of a new SGR source, SGR1627-41
- SGR 1900+14
- SGR1900+14
- SGR1900+14
- BATSE on-board GRB trigger change
- Untitled
- Possible new SGR from US Naval Observatory
- RXTE Observations of SGR 1814-13