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').
10635 results found.
- GRB 040511: Second Epoch Optical Observations
- GRB 040511: Optical Observations
- GRB040511: Optical Observations
- GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
- IPN triangulation of GRB040425 (=H3183)
- GRB 040422: ROTSE-IIIb Prompt Optical Limits
- GRB 040422: a long GRB detected with INTEGRAL
- GRB 040403, deep optical observations
- HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
- GRB 040403: Optical observations
- GRB 040403: a long GRB detected with INTEGRAL
- Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
- GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
- IBAS GRB Alert 1694
- GRB040323: NIR Observations and Variable Object
- GRB 040323: a long GRB detected with INTEGRAL
- IBAS GRB alerts 1679, 1680, 1681
- GRB040223: Deep NIR NTT data re-analysis
- GRB 031203: spectoscopic evidence for a 1998bw-like SN
- MASTER: RXTE GRB040308 optical observation
- IBAS results on a burst from SGR1806-20
- INTEGRAL detection of activity from SGR1806-20
- IPN triangulation of GRB040228 (H3066, H3067)
- GRB 040223: further offline analysis
- GRB031220: 2nd Chandra observation and X-ray afterglow candidate
- GRB040106, likely optical afterglow
- GRB031220: observation at Univercity of Miyazaki
- GRB 040106 : peak flux
- IPN triangulation of an intermediate burst from SGR1806-20
- GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
- GRB031220(=H2976): Observation with the Chandra X-ray Observatory
- GRB031220: Palomar Observations
- GRB 031220: Subaru observation
- GRB 031220: Optical observation at Tokyo Tech
- GRB031220: ROTSE-IIIb Optical Limits
- GRB031220 : Optical Observation of Lulin Observatory
- GRB 2974 follow-up observations
- GRB 021203: A Normal GRB viewed far off axis?
- GRB 031203: Variable Radio Source
- GRB 031203: Optical/IR Astrometry
- GRB 031203: Deep NIR NTT & VLT observations
- GRB 031203: Radio detection
- IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
- GRB 031203: further analysis of INTEGRAL data
- GRB 031203: A long GRB detected with INTEGRAL
- IPN/HETE localization of GRB031109 (=H2917; large error box)
- IPN detection of activity from SGR1806-20
- IPN triangulation of GRB031107 (two large error boxes)
- HETE Prompt GRB Spectral Analyses
- XRF031109 (=H2919): A very long XRF localized by HETE
- Lulin optical follow-up observations of GRB031026
- GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
- 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
- IPN detection of continued activity from SGR1806-20
- A burst from SGR 1806-20 detected with IBAS
- IPN triangulation of GRB030926 (short/hard; large error box)
- IPN triangulation of GRB030922B (large error box)
- XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
- IPN triangulation of GRB030921 (large error box)
- IPN triangulation of GRB030919 (large error box)
- GRB 030913, optical candidate
- GRB030913: AAVSO optical observations
- GRB030913 (=H2849): TAROT Observations
- XRF030824: Optical observations
- IPN triangulation of GRB030903 (large error box)
- IBAS detection of bursts from SGR 1806-20
- Radio Observations of SGR1806-20
- IPN triangulation of GRB030831 (annulus)
- IPN triangulation of GRB030830 (large error box)
- 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
- IPN triangulation of GRB030806 (large burst; large error box)
- IPN/HETE summary of recent bursts from SGR1806-20
- GRB030725, optical transient observations
- GRB030723: Upper limits from historical observations
- GRB030725, possible optical transient
- XRF030723, BVRcIc field photometry correction
- XRF030723, ROTSE-III Early Observations
- Konus-Wind detection of the bursts from SGR1806-20 region
- SGR 1806-20, submm observations
- H2768, H2770, and H2771: Three Bursts from SGR1806-20
- IPN triangulation of GRB030717 (annulus)
- RXTE PCA Observations of SGR1806-20 Region
- Triangulation of GRB030715 (single large error box)
- IPN triangulation of GRB030714 (two large error boxes)
- IPN triangulation of GRB030715 (two large error boxes)
- IPN detection of renewed activity from SGR1806-20
- IPN triangulation of GRB030629 (annulus)
- GRB030329: second XMM-Newton observation
- GRB030418: R optical observations
- HETE detection of burst from SGR1806-20
- GRB030329 -- RATAN-600 data in April-May
- GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch