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"2676 results found.
- GRB 081226: Swift-XRT refined analysis
- GRB081203A: BTA observation
- GRB 081216 : Fermi GBM observation
- Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
- GRB 081207: Fermi GBM detection
- GRB 081211: Swift-BAT refined analysis
- GRB 081206: Fermi GBM detection
- GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
- GRB 081126: Confirmation of the Optical Afterglow
- GRB 081126: optical observations
- GRB 081126: Swift-BAT refined analysis
- GRB 081126: Enhanced Swift-XRT position
- GRB 081126: Swift detection of a burst
- GRB 081119: Fermi GBM detection
- GRB 081110: MASTER: first optical observations Fermi GRB
- GRB 081109A, Swift-BAT refined analysis
- GRB 081109A optical upper limit
- GRB 081109: REM NIR afterglow detection
- GRB 081109: Swift detection of a burst
- GRB 081107: Fermi GBM detection
- GRB 081104: Swift detection of a burst
- Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
- Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
- GRB 081024: KAIT Optical Limits
- Detection of flare star Algol in Swift-BAT slew data
- Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
- AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
- GRB 080925: Suzaku WAM observation of the prompt emission
- GRB081001: SuperAGILE Localization of a long GRB
- GRB 080919: Swift-XRT refined analysis
- GRB 080919: REM NIR observations
- INTEGRAL ToO observation of SGR0501+4516
- Swift trigger 322590: BAT detection of a possible burst
- SGR 0501+4516: Swift XRT measure of the spin period
- GRB080823: Fermi Gamma-ray Burst Monitor detection
- GRB080805 optical limit by "Pi of the Sky"
- GRB 080805: Swift detection of a burst
- GRB 080725, Swift-BAT refined analysis
- GRB 080721, Swift-BAT refined analysis
- GRB 080721: Swift detection of a burst with a bright optical counterpart.
- Trigger 317393: Swift detection of a possible GRB
- GRB 080714: Swift detection of a burst
- GRB 080702B: Swift XRT and UVOT observations
- GRB 080701A: Early Super-LOTIS Observations
- Konus-Wind observation of GRB 080605
- GRB 080603B : Xinglong EST observations
- Konus-Wind observation of GRB 080603B
- GRB 080603B, Swift-BAT refined analysis
- GRB080604: confirmation of optical afterglow
- SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
- Swift analysis of BAT Slew Survey event (Trigger=009)
- GRB 080514B: UVOT Observations
- GRB 080514B: Swift-XRT analysis
- GRB 080514B: Afterglow candidate
- Konus-Wind observation of GRB 080507
- GRB 080430
- GRB 080420?: Swift detection of a possible short burst
- GRB 080413B: Rapid PROMPT Observations
- GRB 080413A: MOA-II optical afterglow observations
- GRB 080411: Swift-XRT Refined Analysis
- GRB080330: MAGIC telescope GeV observation
- GRB 080411: Swift detection of a bright burst
- GRB 080330: REM optical observations
- GRB 080330 Swift-UVOT refined analysis
- GRB 080330: Swift detection of a burst with an optical counterpart
- GRB 080325: NIR afterglow candidate
- GRB 080320: Early Super-LOTIS Observations
- GRB 080319B: Gemini-South photometry
- GRB 080319b light curve by Pi-of-the-Sky
- GRB 080319A: Swift detection of a burst
- Swift trigger 306323: Swift-BAT/XRT refined analysis
- GRB 080310: GAO 150cm telescope Optical Observation
- GRB 080310: RRM optical photometry with the VLT
- GRB080310: Super-LOTIS suggestion of brightening
- VLA possible radio detection of GRB 080229
- GRB 080229: Enhanced Swift-XRT position
- UVOT analysis for GRB080229
- GRB 080229: Swift detection of a bright burst
- GRB 080218: Swift detection of a burst
- Swift-XRT and UVOT observations of the IPN burst GRB 080211
- GRB080212: Optical afterglow candidate observed by MITSuME Telescope
- GRB 080205: GAO 150cm telescope Optical limit
- GRB 080129: TAROT La Silla observatory optical observations
- Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
- GRB 071125: Suzaku WAM observation of the prompt emission
- IPN triangulation of very bright GRB 071125
- GRB071104: NIR Afterglow Candidate at TNG
- GRB 071122: MASTER optical observation
- Correction to the Swift-BAT Transient Identification (trigger=296683)
- GRB071112C: Errata of MITSuME Ic band photometry
- GRB071112C MITSuME Okayama Optical Observation
- GRB 071112C: Palomar Pre-Imaging
- VLA prompt radio detection of the INTEGRAL burst 071109
- GRB 071104: Swift-XRT position
- GRB 071104: Gamma Ray Burst Localization by SuperAGILE
- GRB 071031: Swift detection of a burst with an optical counterpart
- GRB 071028: Swift detection of a burst
- GRB 071025: Kuiper Telescope Optical Observations
- GRB 071025: R/I-band update
- GRB071021 : CFHT Ks-band observation