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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"4183 results found.
- IPN Triangulation of GRB 130320B (very long/bright)
- Swift XRT observations of GRB 130310A
- GRB 130306A: Swift detection of a burst
- GRB 130305A: Fermi GBM observation
- GRB 121128A: optical observations in Mondy observatory
- SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
- Trigger 549841: Swift detection of SGR1806-20
- IPN Triangulation of GRB 130219A
- GRB 130215A: Additional P200 NIR observations
- GRB 130215A: P60 Observations
- Swift/BAT trigger 547142 is new source Swift J1753.7-2544
- Swift Trigger 547142: a probable Galactic source
- GRB 121229A: VLT/X-shooter redshift
- GRB 121229A: MAXI/GSC detection
- GRB 121229A: GROND detection of the afterglow
- Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
- Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
- GRB 121211A: MITSuME Okayama Optical Observation
- GRB 121127A: Suzaku WAM observation of the prompt emission
- GRB 121128A: optical observation in Mondy observatory
- IPN Triangulation of GRB 121127A (short/hard)
- GRB 121123A: Swift/UVOT Observations
- GRB 121123A: Swift-XRT refined Analysis
- GRB 121123A: NOT optical observations
- GRB 121123A: Swift detection of a burst with optical counterpart
- GRB 121108A: MITSuME Ishigakijima upper limits
- GRB 121108A: Swift detection of a burst
- GRB 121027A - Gemini South spectroscopy
- GRB 121029A: Fermi GBM detection
- Swift Quick-look and HEASARC will be offline for due to hurricane Sandy
- GRB 121027A: Swift detection of a burst
- GRB 121011A: early optical light curve
- GRB 121011A: optical observations
- Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
- Trigger 535747: Swift detection of an outburst from SGR1806-20
- GRB 120923A: Correction to GCN 13823
- GRB 120923A: JHK Observation
- IPN Triangulation of long GRB 120919B
- GRB 120916A: Fermi-LAT detection of a burst
- GRB 120907A: Swift detection of a burst with optical counterpart
- XMM observations of the short GRB120804A
- IPN Triangulation of short GRB 120830A
- GRB 120817B: BAT location in ground analysis and refined analysis
- Improved IPN error box for short hard GRB 120811B
- GRB 120811C: Swift detection of a burst with an optical counterpart
- GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
- GRB 120807A: Swift detection of a burst
- Fermi/GBM detection of an SGR-like burst
- GRB 120729A: Fermi GBM observation
- GRB 120729A: JCMT SCUBA-2 sub-mm observation
- IPN Triangulation of GRB 120728B (long/intense)
- GRB 120729A: UKIRT Observation
- T100 observations of GRB 120729A
- GRB 120729A Gemini-N redshift
- GRB 120724A: Swift detection of a burst
- Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
- GRB 120624B: VLA Observations
- GRB 120711A: Swift-XRT observations
- GRB 120711A: MAXI/GSC detection
- GRB 120703A: Swift/UVOT Detection
- GRB 120703A: NOT optical observation
- GRB 120703A: Swift detection of a bright burst with an optical afterglow
- GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
- IPN Triangulation of GRB 120624A (short/intense)
- GRB 120622A: MAXI/GSC detection
- Swift triggers (#524542) on a Galactic source
- GRB 120521B: Fermi GBM observation
- Swift starts a new program to find fainter transients
- GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
- Fermi/GBM detection of a burst from the magnetar 1E 2259+5
- GRB 120422A: CARMA 3mm observations
- GRB 120422A: optical observations
- GRB 120424A: MAXI/GSC detection of a burst
- GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
- GRB 120403B: TAROT La Silla observatory optical observations
- GRB 120403A, Swift-BAT refined analysis
- GRB120327A - ATCA radio afterglow detection at 34GHz
- GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
- Swift trigger 518853: MASTER-ICATE possible OT
- GRB 120327A: Swift/UVOT further analysis
- GRB 120327A: Liverpool Telescope Observations
- GRB 120327A: Swift detection of a burst with an optical counterpart
- GRB 120326A: Swift detection of a burst
- IPN Triangulation of GRB 120323A (short/very intense)
- GRB 120302A: RTT150 optical observations
- GRB 120305A: EVLA deep limit on a radio counterpart
- GRB 120305A: Enhanced Swift-XRT position
- GRB 120305A: Swift-BAT refined analysis
- GRB 120305A: MASTER-NET early optical observations
- GRB 120305A: Swift detection of a short burst
- GRB 120302A: GROND detection of an afterglow candidate
- GRB 120224A: Swift-BAT refined analysis
- GRB 120219A: Swift detection of a burst
- Fermi GBM detection of an SGR-like burst
- GRB 120212A: Swift detection of a burst
- GRB 120127A: MASTER optical observations
- GRB 120127A: MAXI/GSC detection of a probable GRB
- GRB 120121A: ISON-NM optical observations
- GRB 120118B: RTT150 optical observations
- Konus-Wind observation of GRB 120119A