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"5544 results found.
- GRB 080916C: Swift XRT refined analysis
- Konus-Wind observation of GRB 080916A
- GRB 080915a, SMARTS optical/IR observations
- GRB 080916: Swift detection of a burst with optical afterglow
- GRB 080913: Swift-XRT refined analysis
- GRB 080906: Swift detection of a burst with optical afterglow
- GRB 080905B: Swift detection of a burst with possible optical counterpart
- GRB 080903: Astrotel-Caucasus optical observations
- GRB 080903: TAROT Calern observatory optical observations
- GRB 080903: Swift detection of a burst
- Swift-BAT trigger 322590 is not a GRB
- Swift trigger 322590: BAT detection of a possible burst
- SGR 0501+4516: XMM-Newton monitoring schedule
- SGR 0501+4516: Decline in Activity
- SGR 0501+4516: MDM Optical Observations
- Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
- GRB 080810: Liverpool and Faulkes North observations
- GRB 080802: Swift detection of a probable burst
- GRB 080727B: IR photometry
- GRB 080727C: Swift detection of a burst
- GRB 080727B: Enhanced Swift-XRT position
- GRB 080727B: Swift detection of a bright burst
- GRB 080710: Gemini spectroscopy and probable redshift
- GRB 080710: KAIT OA candidate
- GRB 080707: GROND Confirmation of the Optical Afterglow
- Trigger 316063: Swift detection of a transient
- GRB 080702B: GROND Upper Limits
- Swift-BAT trigger 314975 possible burst
- GRB080613B: MITSuME upper limits
- GRB 080613B: Swift detection of a burst
- GRB 080613 : a long GRB detected with INTEGRAL
- Swift observations of BAT Slew Survey event (Trigger=010)
- GRB 080607 KAIT observations
- GRB 080602: Swift-XRT refined analysis
- Konus-Wind observation of reactivation of SGR 1627-41
- Reactivation of SGR 1627-41
- GRB 080514B: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 080514B
- GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
- GRB 080516, GROND observations
- GRB 080516: Enhanced Swift-XRT position
- GRB 080516: Swift detection of a burst
- GRB 080514B: SuperAGILE/IPN GRB Localization
- GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
- GRB 080506: Swift detection of a burst with optical afterglow
- GRB 080503: Swift detection of a short burst
- GRB 080430: Swift detection of a burst with optical afterglow
- GRB 080413A: MOA-II optical afterglow observations
- GRB080413A: Swift/UVOT observations
- GRB 080413: Swift detection of a burst with an optical afterglow
- GRB 080413: ROTSE-III Detection of Optical Counterpart
- GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
- GRB 080328: GAO 150cm telescope Optical Observation
- GRB080328, RIMOTS optical upper limit
- GRB 080330: Swift detection of a burst with an optical counterpart
- GRB 080325: GROND Observations
- GRB 080325: Swift detection of a burst
- GRB 080320, Swift-BAT refined analysis
- GRB 080320: Swift XRT refined analysis
- GRB 080320: Gemini-N optical afterglow
- GRB 080320: Enhanced Swift-XRT position
- GRB 080320: Swift detection of a burst
- GRB 080319D: Swift detection of a burst with a possible optical afterglow
- GRB080319B Liverpool Telescope optical afterglow candidate
- GRB 080310: GAO 150cm telescope Optical Observation
- GRB080310 : Optical observations by LOAO and Lulin
- GRB 080310: ROTSE-III Observations of Optical Counterpart
- GRB080310: Optical observation by MITSuME telescope
- GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
- GRB 080310 - SDSS Pre-Burst Observations
- GRB 080310: Lick/Kast Spectroscopy
- GRB080310: Super-LOTIS suggestion of brightening
- GRB 080310: Swift detection of a burst with optical afterglow
- GRB080307 BOAO optical afterglow observation - detection of a possible OT
- GRB080307 - SDSS Pre-Burst Observations
- GRB 080307: Gemini-N i-band observations - candidate afterglow
- GRB 080307: retraction of UVOT candidate
- GRB 080307: Optical observation with DMC/KANATA
- GRB 080307: Swift detection of a burst
- GRB 080303
- GRB 080303: Swift detection of a burst with optical afterglow
- GRB 080303: REM NIR afterglow candidate
- GRB 080303A: ROTSE-III Optical Limits
- GRB080229: Possible optical afterglow
- GRB 080229: Swift detection of a bright burst
- GRB 080212: Swift detection of a burst
- GRB 080210: GOND detection in all bands and redshift upper limit
- Swift detection of AX J1749.1-2639
- GRB 080207: Swift detection of a burst
- GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
- GRB 080129: optical limit by Pi of the Sky
- SNe 2008D and 2007uy: Chandra Detections
- GRB 080121: Nearby SDSS galaxies
- XRF 080109/SN 2008D: PROMPT Optical Imaging
- Discovery of Radio Emission from Transient in NGC 2770
- XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
- Refined Swift-XRT analysis of the transient in NGC 2770
- Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
- Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
- Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?