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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').
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"

966 results found.

  1. GRB 110213B: MAXI/GSC detection of a probable GRB
  2. New feature in Fermi GBM GRB Ground Position Notices
  3. GRB 101225A: MAXI/GSC observations
  4. XRF 101117A, RIMOTS optical upper limits
  5. Swift detection of MAXIJ1409-619
  6. XRF 101117A: Palomar Transient Factory Observations
  7. GRB 101117B: Swift-BAT refined analysis
  8. XRF101117A: MAXI/GSC detection of a short X-ray transient
  9. Konus-Wind observation of GRB 101112A
  10. GRB 100925A / MAXI J1659-152: MASTER optical observations
  11. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  12. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  13. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  14. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  15. GRB 100925A / MAXI J1659-152: SARA-S Observations
  16. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  17. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  18. GRB 100925A/MAXI J1659-152 - NOT optical observations
  19. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  20. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  21. GRB 100823A: MAXI/GSC detection
  22. XRF 100701A : MAXI/GSC detection of a probable XRF
  23. XRF 100616a : MAXI/GSC detection of a probable XRF
  24. GRB 100510A: Fermi GBM detection/observation
  25. GRB 100510A: MAXI/GSC detection
  26. GRB 100508A: Swift-XRT Refined analysis
  27. GRB 100415A: MAXI/GSC detection of a probable GRB
  28. Short X-ray Transient detected by MAXI/GSC
  29. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  30. GRB 100302A: Swift/UVOT Upper Limits
  31. GRB 100302A: Swift detection of a burst
  32. Short X-ray Transient detected by MAXI/GSC
  33. Swift Trigger 381591: Uncatalogued UVOT Source
  34. Trigger 381591: Swift detection of a possible burst
  35. GRB 091208B: Swift-XRT refined analysis
  36. Short X-ray Transient, RIMOTS optical upper limits
  37. Short X-ray Transient Detection by MAXI/GSC
  38. GRB 091130B: Swift/UVOT Upper Limits
  39. IPN Triangulation of GRB091120
  40. Konus-Wind observation of GRB 091120
  41. GRB 091120: MAXI GSC detection
  42. GRB 090926B: MAXI GSC detection
  43. GRB 090831A: Suzaku WAM observation of the prompt emission
  44. GRB 090831A: IPN Triangulation
  45. GRB 090831: MAXI GSC detection
  46. GRB 090826: Fermi GBM detection
  47. Konus-Wind and Konus-RF observations of GRB 090618
  48. GRB 090424: WSRT Radio Observations
  49. GRB 090515: Swift-XRT refined analysis
  50. GRB 090308: Swift/UVOT Upper Limits
  51. GRB 081230 Swift/UVOT Observations
  52. GRB 081230: Swift detection of a burst
  53. GRB 071118: Swift detection of a burst
  54. Swift/UVOT refined analysis of GRB070531
  55. GRB 070412: Deep Keck imaging
  56. GRB 070224: Swift/UVOT Upper Limits
  57. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  58. GRB 061002: Swift detection of a burst
  59. GRB 060729: Refined analysis of the Swift-BAT burst
  60. GRB 050726: early Swift XRT analysis results
  61. Konus-Wind observation of GRB 050401
  62. IPN Summary of SGR1806-20 Activity in 2004
  63. GRB020305, optical observations
  64. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  65. GRB980703 optical photometry
  66. GRB980703 Transient Optical Follow-Up

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