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').
10043 results found.
- Optical observations of field of GRB040912
- GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
- GRB 040903 - INTEGRAL data analysis
- Very bright burst detected from SGR 1806-20
- Possible GRB 040903 detected with INTEGRAL
- GRB 040827: UKIRT - 2nd epoch K-band imaging
- GRB 040827: K imaging - no evidence of variability
- GRB 040827: RTT150 optical observations
- GRB040825B (=H3510): An XRF Localized in Real Time by HETE
- GRB 040812: Second epoch CXO Observations
- CXO observation of GRB 040812
- Bursting activity from SGR 1806-20 detected with IBAS
- IPN/HETE localizations of GRB040810 (=H3489)
- GRB 040812: a long GRB detected by INTEGRAL
- XRF040701: Optical Observations at ESO
- IPN/HETE triangulation of GRB040802 (=H3485)
- GRB 040730: a long GRB detected with INTEGRAL
- GRB040624: optical monitoring at TNG
- XRF040701: VLA Observations
- XRF040701 (=U11548): a bright XRF detected by HETE
- GRB 040624: optical observations
- GRB 040624: optical observations at TNG and VLT
- IPN Summary of SGR1806-20 Activity in 2004
- SGR 1806-20: no IR variability of the proposed counterparts
- GRB 040511: NIR observations with REM
- IBAS GRB Alerts n.1785 to 1791
- GRB 040511: Second Epoch Optical Observations
- GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
- IPN triangulation of GRB040425 (=H3183)
- On Line Availability of Archival HETE Fregate Data and Lightcurves
- GRB 040423 (=H3175): A Long GRB Localized by HETE
- IBAS GRB alerts 1739, 1740, 1741
- HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
- GRB 040403: Optical Observations
- GRB 040403: optical observations
- Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
- IBAS GRB Alert 1694
- GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
- GRB 040323: a long GRB detected with INTEGRAL
- IBAS GRB alerts 1679, 1680, 1681
- IBAS Alert 1678: not a GRB
- MASTER: RXTE GRB040308 optical observation
- IBAS results on a burst from SGR1806-20
- INTEGRAL detection of activity from SGR1806-20
- RXTE GRB040229 optical observation: no candidate
- IPN triangulation of GRB040228 (H3066, H3067)
- GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
- GRB 040223: Deep NIR NTT observations
- GRB 040223: REM IJK Observations
- GRB 040223: a long GRB detected with INTEGRAL
- Follow-up on IBAS GRB Alert 1379
- GRB040106: optical observations with REM+ROSS
- GRB 040106: Optical observations
- GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
- GRB 031220: Subaru observation
- GRB 031220: Optical observation at Tokyo Tech
- GRB031203, improved XMM position
- GRB 031203: Optical/IR Astrometry
- IPN/HETE localization of GRB031203B (=H2949; large error box)
- XMM-Newton Observation of GRB031203
- GRB031203: K' Photometry of the likely GRB host
- XMM-Newton Observation of GRB031203
- GRB 031203: IR NTTobservations do not confirm REM detection
- GRB 031203: IR REM Observations
- GRB 031203: A long GRB detected with INTEGRAL
- IPN triangulation of GRB031130 (large error box)
- IPN triangulation of GRB031120 (two large error boxes)
- GRB 031111B (= H2925) : Kyoto Optical Observation
- IPN/HETE localization of GRB031109 (=H2917; large error box)
- GRB 031111: Optical observations
- SN 2003jd (SN/GRB?) -- X-ray Observations
- HETE Prompt GRB Spectral Analyses
- IPN triangulation of GRB031111 (=H2924): small error box
- XRF031109 (=H2919): A very long XRF localized by HETE
- GRB030929/SN2003jd association unlikely based on IPN localiztion
- IPN triangulation of GRB031027 (small error box)
- Lulin optical follow-up observations of GRB031026
- GRB 031026 (=H2882): Evidence for High Redshift from Prompt
- GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
- XRF 030723: Subaru Optical Observations
- IPN triangulation of GRB031004A (short/hard; annulus)
- XRF 030824: observations at CFHT
- IPN triangulation of GRB030926 (short/hard; large error box)
- XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
- XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
- GRB030913: Subaru Optical Observations
- GRB030913: OT's limit by MASTER
- GRB030913 (=H2849): Confirmation of the Flight Localization
- Magellan Observations of GRB030725 (=H2779)
- GRB030913 (=H2849): A GRB Possibly Localized by HETE
- IPN triangulation of GRB030822 (annulus)
- GRB030823: optical observation at Tokyo Tech
- IPN triangulation of GRB030821 (=H2814; refined error box)
- GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
- Summary of recent IPN and HETE detections of SGR bursts
- IPN triangulation of GRB030814 (annulus)
- 030813 SGR event (Konus-Wind observation)
- SGR 1808-20 (=H2802): A Possible new SGR
- XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
- IPN/HETE summary of recent bursts from SGR1806-20