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"4256 results found.
- GRB 111029A: optical upper limit
- GRB 111026A: Swift detection of a burst
- GRB 111022A: MASTER-Net early limit
- GRB 110825A: GROND Observations
- GRB 110924A: Swift detection of a possible burst
- GRB110918A: Lick Observations
- GRB 110918A: INT optical detection of Swift candidate afterglow
- Swift detection of short bursts from PSR J1647-4552
- GRB 110915A: MITSuME Akeno Optical upper limits
- GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
- SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
- SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
- Swift detection of an SGR burst from Swift J1834.9-0846
- Swift-BAT Trigger 501485 is noise
- GRB 110818A, Swift-BAT refined analysis
- SGR 1834.9-0846/ GRB 110807A, I-band observations
- SGR 1834.9-0846/ GRB 110807A: archival IR observations
- SGR J1834.9-0846: A Neutron Star in W41?
- Swift SGR 1834.9-0846: Swift-BAT refined analysis
- Fermi GBM detection of a SGR-like burst
- GRB 110807A: Swift detection of a burst or a posible new SGR
- GRB 110726A: two epochs of SAO RAS optical observations
- GRB 110801A: MASTER OT observations
- AXP 4U 0142+61: Fermi GBM detection
- Swift detection of a SGR-like burst from the AXP 4U 0142+61
- GRB 110719A: GRT Optical Observation
- GRB 110719A: optical limit by "Pi of the Sky"
- Swift J1822.3-1606
- Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
- Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
- GRB 110709B: Preliminary Swift-BAT refined analysis
- GRB 110709B: Swift detection of a burst
- GRB 110709A: MASTER-NET optical observations
- GRB 110709A: Swift detection of a burst
- Swift trigger 456780 is not a burst
- SGR 1E 1841-045: early optical limit by "Pi of the Sky"
- SGR 1E 1841-045: Swift-BAT refined analysis
- SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
- SGR 1E 1841-045: Swift-BAT refined analysis
- SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
- GRB 110529A: Suzaku WAM observation of the prompt emission
- GRB 110530A: Swift-XRT refined Analysis
- GRB 110529A: Fermi GBM detection
- LAT Observations of GRB110529A
- GRB 110520A: MASTER-NET optical observations
- GRB 110519A: Swift detection of a burst
- GRB 110412A: Swift-BAT refined analysis
- GRB 110411A: MASTER prompt and follow-up optical limits
- GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
- GRB 110328A / Swift J164449.3+573451: VLBA Observations
- GRB 110406A: Positional coincidence with NGC 404
- ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
- GRB 110402A afterglow observation
- GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
- GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
- GRB 110328A / Swift J164449.3+573451: Mondy optical observations
- GRB 110328A / Swift J164449.3+573451: BAT refined analysis
- GRB 110328A / Swift J164449.3+573451: Konkoly observations
- GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
- GRB 110328B: Fermi-LAT Detection
- GRB 110328B: Fermi GBM detection
- GRB 110301A: Fermi GBM detection
- Fermi GBM detection of an SGR-like burst
- GRB 110213A: YNAO-GMG Observations
- GRB 110213B: MAXI/GSC refined analysis
- GRB 110213A: Swift detection of a burst with optical afterglow
- GRB 110208A: Potential afterglow from Magellan
- SGR-like outburst from the magnetar 1E 1841-04.5
- GRB 110205A: Lightbuckets Optical Observations
- GRB110205A: MITSuME Ishigakijima Optical Observation
- GRB 110205A: Swift-BAT refined analysis
- GRB 110112A: MASTER optical observations
- GRB 110112A: Swift detection of a possible short burst
- Short GRB 110106A: MASTER OT observations
- GRB 101219A: Swift detection of a short hard burst
- GRB 101129A : Suzaku WAM observation of the prompt emission
- GRB 101204A detected in ground analysis of BAT data
- GRB101030A
- Swift detection of MAXIJ1409-619
- Fermi GBM detection of a burst from a galactic source
- GRB 10112A: MASTER optical observations
- GRB 090113, the review of the sky area in plate archives
- GRB 101030A: Swift detection of a burst
- GRB 100728B: X-shooter redshift
- GRB100906A: Optical observations at IAO
- GRB 100901A: Faulkes Telescope North afterglow candidate
- GRB100807A: R band observations
- EVLA radio afterglow detection of GRB 100814A
- GRB 100814A: IAC80 R-band observations
- GRB 100814A: Swift UVOT observations of the optical afterglow
- GRB 100814A: ROTSE-III Detection of Optical Counterpart
- Swift-BAT trigger 431582 likely is IGR J17464-2811
- GRB100807A: MITSuME optical upper limits
- GRB 100805A: Xinglong TNT optical observation
- GRB 100805A: GRAS 002 optical observations
- GRB100713A: Swift X-ray afterglow detection
- IPN triangulation of GRB 100707A
- IPN triangulation of GRB 100701B
- Konus-Wind observation of GRB 100704A
- GRB 100628A: GROND optical/NIR observations of the host candidate