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"50 results found.
- EP#01709175213/IGR J19566+0326: Swift-XRT detection
- EP-WXT trigger 01709175213: a new X-ray outburst of LMXB MAXI J1957+032
- Fermi trigger No 737218721: Global MASTER-Net observations report
- Fermi GRB 231115A: Global MASTER-Net observations report
- Fermi GRB 231108A: Global MASTER-Net observations report
- GRB 230510A: Swift detection of a burst
- GRB 220427A: Swift detection of a burst with an optical counterpart
- Swift trigger 1073821: detection of IGR J16418-4532
- Swift Trigger 863053 is not an astrophysical event
- Swift detects a flare from AX 1631.9-4752
- Swift Trigger 847216: misidentification of IGR J16385-2057
- Swift trigger 773082 is probably not astrophysical
- Swift Trigger 727422 is not an astrophysical event.
- GRB 160411A: Swift/UVOT Upper Limits
- Swift 650221/IGR J00291+5934: Liverpool Telescope observations
- IGR J00291+5934, Swift-BAT refined analysis
- Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations
- Trigger 650221: Swift detection of a IGR J00291+5934
- Swift IGR J00291+5934: MASTER Optical flare detection
- IGR J00291+5934: Swift-BAT refined analysis
- Trigger 650140: Swift detection of IGR J00291+5934
- Trigger 614903: Swift detection of IGR J17544-2619
- Swift Trigger 609694 is probably not an astrophysical source
- Swift detection of SFXT IGR J17544-2619
- Trigger 599041: Swift detection of SFXT IGR J16479-4514
- GRB 130627B: Swift/UVOT Upper Limits
- Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
- Swift detection of IGR J18245-2452
- Swift Trigger 530441 is a false trigger
- Swift-BAT trigger 529813 is due to noise while entering the SAA
- Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
- Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
- Swift detection of IGR J17062-6143
- Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
- Swift detection of 4U 1630-47
- Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
- Swift-BAT trigger 431582 likely is IGR J17464-2811
- Swift detection of outburst from the SFXT IGR J18410-0535
- Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
- Trigger 324561: IGR J08408-4503 detected by Swift
- Refined analysis of Swift Trigger 316063, is IGR J08408-4503
- Trigger 316063: Swift detection of a transient
- IBAS Alert n. 5257 : not a GRB
- Swift-BAT trigger 306829 is IGR J16479-4514
- IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
- Swift detection of IGR J17497-2821 (trigger 230504)
- GRB 060210: Radio Observations
- GRB060210: Swift XRT Refined Analysis
- Swift Trigger #152652 is not a GRB
- 030331 NOT A GRB