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"2795 results found.
- Swift Trigger 533836 is a new Galactic transient
- GRB 120909A: Swift-BAT refined analysis
- GRB 120821A: Swift/XRT observations
- GRB 120804A: Possible temporal break in the X-ray light-curve
- Swift Trigger 530581: GRB 120811A or a galactic transient
- GRB 120803A: optical upper limit
- GRB 120805A: 1.23m CAHA observations
- GRB 120803A: Swift-BAT refined analysis
- GRB 120803B: FTN possible afterglow candidate
- GRB 120803A: Swift detection of a possible burst
- Trigger 529076: Swift possible detection of SwJ1910.2-0546
- Swift Trigger 528925 is probably a noise fluctuation
- GRB 120724A: optical observation in Maidanak observatory
- GRB 120724A: Gemini-N tentative redshift
- GRB120714A: Swift/UVOT upper limits
- GRB 120711A: Swift/UVOT Observations
- GRB 120711A: a possible X-ray transient
- Swift Trigger 525554 is probably not a GRB
- Swift Trigger 524949: Noise fluctuation near a galaxy
- GRB 120521C: Early Tautenburg limits
- GRB 120514A: Swift-BAT refined analysis
- Fermi Trigger 358364818: BOOTES-4 observations
- GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
- GRB 120510A: Swift XRT and UVOT observations
- GRB 120422A: i-band re-brightening and possible SN detection
- GRB 120422A: optical observations
- GRB 120422A, the review of the sky area in plate archives
- GRB 120422A: Gemini redshift of candidate host
- GRB 120326A, the review of the sky area in plate archives
- GRB 120402A: optical upper limit
- GRB 120402A: Swift detection of a possible burst or noise
- GRB 120324A, the review of the sky area in plate archives
- Swift trigger 518853: MASTER-ICATE possible OT
- GRB 120327A: Gemini-South redshift
- GRB 120326A: Swift-BAT refined analysis
- GRB 120324A: Swift-BAT refined analysis
- GRB 120324A: Liverpool Telescope optical candidate
- GRB 120320A, the review of the sky area in plate archives
- GRB 120320A, Swift-BAT refined analysis
- GRB 111228A: possible detection of the SN with the TNG
- GRB 120302A: Swift XRT refined analysis
- GRB 120312A, the review of the sky area in plate archives
- GRB 120311A, the review of the sky area in plate archives
- GRB 120302A, the review of the sky area in plate archives
- GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
- GRB 120305A: Swift-BAT refined analysis
- GRB 120219A, the review of the sky area in plate archives
- GRB_120215, the_review_of_the_sky_area_in_plate_archives
- GRB 120212A: Errata of subject in GCNC 12936
- GRB 120202A, the review of the sky area in plate archives
- GRB 111228A, the review of the sky area in plate archives
- GRB 111228A: Possible host detected by Swift/UVOT
- GRB 120116A, the review of the sky area in plate archives
- GRB 120121A: Swift-XRT position
- GRB 120102A, the review of the sky area in plate archive
- GRB 110915B, the review of the sky area in plate archives
- GRB 111225A, the review of the sky area in plate archives
- GRB 111222A, the review of the sky area in plate archives
- GRB 111211A: Detection of the SN with the 10.4m GTC
- GRB 120102A: Swift-BAT refined analysis
- GRB 110915A, the review of the sky area in plate archives
- GRB 111229A: Swift detection of a burst
- GRB 111228A: Possible host galaxy in the SDSS arhive
- GRB 111225A: Swift-XRT refined Analysis
- GRB 111205A: Confirmation of X-ray Afterglow
- Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
- GRB 111215A: Swift-BAT refined analysis
- GRB 111201A, the review of the sky area in plate archive
- GRB 111209A: VLT/X-shooter redshift
- GRB 111205A: GROND observations
- GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
- GRB 111123A, Swift-BAT refined analysis
- GRB 111123A: TNG NIR detection of the afterglow candidate
- GRB 111117A, the review of the sky area in plate archives
- GRB 111117A: TNG observations
- GRB111107A: Further ATCA observations - no detection
- GRB111107A: ATCA observations - upper limit and a possible detection
- GRB 111109A: Swift-BAT refined analysis
- GRB 111107A: Swift-BAT refined analysis
- GRB 111103B : WIYN 3.5m NIR observations
- GRB 111022B: BTA Optical Observations
- GRB 111020A Spectral lag analysis
- GRB 110918A: Optical light curve for days 1.4 to 16.3
- GRB 111016A: Swift-BAT refined analysis
- GRB 111016A: P60 Afterglow Candidate
- GRB 111016A: Swift detection of a burst
- GRB 111005A: EVLA Observations
- GRB 110924A: Swift detection of a possible burst
- GRB 110918A optical observation
- GRB 110903A: Suzaku WAM observation of the prompt emission
- GRB 110825A: Further Swift/XRT Observations
- MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
- GRB 110905A: Potential BAT trigger on MAXI J1836-194
- Trigger 502024: Swift detection of KS 1741-293
- GRB110825A: Fermi GBM observation
- GRB 110825A: GMG optical observation
- GRB 110825A: field inspection and possible host galaxy
- GRB 110820A, the review of the sky area in plate archives
- IPN triangulation of GRB 110820B (very long duration, extremely intense)
- IPN triangulation of GRB110802A (short/hard burst)