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"512 results found.
- Swift Trigger 718766 is not an astrophysical event.
- Konus-Wind observation of GRB 161010A
- GRB 160824B: Lomonosov BDRG gamma ray detection and MASTER limit
- GRB 160821B: VLA 5.0 GHz observations
- GRB 160821B: NOT optical afterglow candidate
- Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
- Konus-Wind observation of GRB 160625B
- Konus-Wind observation of GRB 160530A
- GRB 160501A: Swift/UVOT Upper Limits
- GRB 160409A found in Swift BAT ground analysis
- GRB 160310A: Fermi-LAT detection
- GRB 160303A: Continued optical monitoring from NOT
- GRB 160303A: JCMT SCUBA-2 sub-mm observation
- Konus-Wind observation of GRB 160220B
- GRB 160107A: Fermi GBM observation
- Konus-Wind observation of GRB 151225A
- GRB 160101A: MAXI/GSC detection
- Swift detection of 4U 1850-03
- GRB 151205B: Deep GROND Upper limits
- GRB 150810A: Fermi GBM detection
- GRB 150801B: Swift-BAT refined analysis
- Konus-Wind observation of GRB 150607A
- Konus-Wind observation of GRB 150510A
- GRB 150403A: Swift/UVOT Detection
- GRB 150403A: Swift detection of a burst with an optical counterpart
- GRB 150301B: Swift-BAT refined analysis
- GRB 150301A: Fermi GBM observation
- Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
- Fermi GBM Observations of Magnetar 4U 0142+61
- Trigger 632888: Swift detection of the magnetar 4U 0142+61
- Trigger 631747: Swift detection of 4U 0614+09
- GRB 150203A: REM optical and NIR observations
- Swift detection of 4U 1700+24 (= V* V934 Her)
- GRB 150103A: Zadko observatory - Gingin optical observations
- Swift detection of 4U 1700+24 (= V934 Her)
- GRB 141212A: MITSuME Okayama upper limits
- Swift detection of outburst from 4U 1700+24
- GRB 140818A: MAXI/GSC detection
- Swift trigger 609139 is probably 4U 1850-03
- GRB 140713A : Xinglong TNT upper limit
- GRB 140706A: Swift-XRT refined Analysis
- Konus-Wind observation of GRB 140604A
- Konus-Wind observation of GRB 140512A
- GRB 140509A: Swift/UVOT Detection and photo-z
- GRB 140509A: Swift detection of a burst with an optical counterpart
- GRB 140402A BAT refined analysis
- GRB 140323A: Swift detection of a burst
- GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
- GRB 131126A: Fermi GBM observation
- Konus-Wind observation of GRB 131125A
- IPN Triangulation of GRB 131127B
- GRB 131127A: Swift-XRT refined Analysis
- GRB 131105A: VLT/X-shooter optical afterglow candidate
- GRB 131028A: Fermi GBM detection
- GRB 131004A, Swift-BAT refined analysis
- GRB 131002B: Swift/UVOT Upper Limits
- GRB 131002B: Swift detection of a burst
- GRB 130822A: Swift/UVOT Upper Limits
- GRB 130812A: Swift-XRT refined Analysis
- Swift Trigger 558828 is not an interesting event
- GRB 130612A: Swift detection of a burst with an optical counterpart
- Konus-Wind observation of GRB 130610B
- Swift Trigger 557674 was due to an onboard position error
- GRB 130606A: Swift-XRT refined Analysis
- GRB130603B: Swift/UVOT detection
- GRB 130603B: Swift detection of a bright short burst
- IPN Triangulation of GRB 130320B (very long/bright)
- GRB 130327B: Fermi GBM detection
- GRB 121217A: Swift/UVOT Detection
- GRB 121217A: GROND Detection of the Afterglow
- GRB 121202A: Fermi GBM observation
- GRB 121201A: a GRB with an optical counterpart
- GRB 120811C: optical observations
- GRB 120811C: optical observations
- GRB 120811C: Swift/UVOT Detection
- GRB 120811C: RTT150 optical observations
- GRB 120811C: MASTER-Amur observations of fading OT
- GRB 120811C: Swift detection of a burst with an optical counterpart
- Swift Trigger 530581: GRB 120811A or a galactic transient
- GRB 120707A: Fermi GBM Detection of a Bright Burst
- Swift detection of 4U 1630-47
- GRB 120328A: Swift-XRT refined Analysis
- GRB 120311B: Swift-BAT refined analysis
- GRB 120119A: Swift/UVOT Observations
- AXP 4U 1042+61: Mondy optical observations
- AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
- Swift detection of an SGR burst from AXP 4U 0142+61
- Konus-Wind observation of GRB 111228A
- GRB 111123A: Swift/UVOT Upper Limits
- GRB 111003A: Fermi GBM detection
- GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
- IPN triangulation of GRB 110918A (long duration, extremely intense)
- AXP 4U 0142+61: Fermi GBM detection
- AXP 4U 0142+61: Swift-BAT refined analysis
- Swift detection of a SGR-like burst from the AXP 4U 0142+61
- GRB 110709B: GROND Detection of an Afterglow Candidate
- GRB 110610A: Swift-XRT refined Analysis
- GRB 110426A: MASTER synchronous with MAXI/GSC observations
- GRB 110328A: Swift detection of a burst
- Konus-Wind observation of GRB 101123A