Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28295 results found.

  1. GRB 111029A: Swift detection of a burst
  2. GRB 111026A: Swift detection of a burst
  3. GRB 111022B: 10.4m GTC z'-band observations
  4. GRB111022B: D50 optical limit
  5. GRB 111020A: Chandra Observation
  6. GRB 111022B: BTA Optical Observations
  7. GRB 111022B: Swift/UVOT upper limits
  8. GRB 111022A: Swift/UVOT Upper Limits
  9. GRB 111016A: optical upper limit
  10. GRB 111022B, Swift-BAT refined analysis
  11. GRB 111022B: Swift-XRT refined Analysis
  12. GRB 111022A: Swift-XRT refined Analysis
  13. GRB 111022B: NOT observations
  14. GRB 111022B: Enhanced Swift-XRT position
  15. GRB 111022A: Swift-BAT refined analysis
  16. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  17. GRB 111022B: Swift detection of a burst
  18. GRB 111022A: Swift detection of a burst
  19. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  20. GRB 111020A: EVLA observations
  21. GRB 111020A: Swift-XRT refined Analysis
  22. GRB 111020A: Swift/UVOT Upper Limits
  23. GRB 111020A: Faulkes Telescope South observations
  24. GRB 111020A: Swift-BAT refined analysis
  25. GRB 111020A: Enhanced Swift-XRT position
  26. GRB 111020A: BOOTES-3 Optical Upper Limit.
  27. GRB 111020A: Swift detection of a short burst
  28. GRB 111018A: Swift/UVOT Upper Limits
  29. GRB 111018A: Swift-BAT refined analysis
  30. GRB 111018A: Swift-XRT refined Analysis
  31. GRB 111018A: GROND Upper Limits
  32. GRB 111018A: Enhanced Swift-XRT position
  33. IPN Triangulation of GRB 111016B (long duration, intense)
  34. GRB111016A : WIYN 3.5m NIR observations
  35. GRB 111018A: Swift detection of a burst
  36. GRB 111017A: Fermi GBM Detection
  37. GRB111016A: D50 optical limit
  38. GRB 111016A: Gemini Detection of the NIR Counterpart
  39. GRB 111016A: Swift/UVOT Detection of a Source
  40. GRB 111016A: Swift-BAT refined analysis
  41. GRB 111016A: P60 Afterglow Candidate
  42. GRB 111016A: Swift-XRT refined Analysis
  43. GRB 111016A: Enhanced Swift-XRT position
  44. GRB 111016A: Swift-XRT observations
  45. GRB 111016A: Swift detection of a burst
  46. GRB 110921A: optical observations
  47. GRB 111008A: Swift/UVOT Upper Limits
  48. GRB 111008A: IAC80 I-band observations
  49. GRB 111008A: Swift-XRT refined Analysis
  50. GRB 111008A, GROND observations
  51. GRB 111008A: NOT optical observation
  52. GRB 111008A: Gemini optical counterpart
  53. GRB 111008A: Enhanced Swift-XRT position
  54. GRB 111008A, Swift-BAT refined analysis,
  55. GRB 111008A: Swift detection of a burst
  56. GRB 111005A: ATCA 18 GHz detection
  57. GRB 111005A: ATCA radio upper limit
  58. GRB 111005A : miniTAO/ANIR NIR observations
  59. GRB 111005A: GROND NIR observations
  60. GRB 111005A: VLT IR observations
  61. GRB 111005A: Swift-BAT refined analysis
  62. GRB 111005A: Swift detection of a burst
  63. GRB 111003A: Fermi GBM detection
  64. GRB 110921A: MITSuME-Akeno Optical photometry
  65. Skynet/Dolomiti observations of GRB 110928A
  66. Skynet observations of GRB 110928A
  67. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  68. GRB 110928A: Swift/UVOT Upper Limits
  69. GRB 110928A: Swift-XRT refined Analysis
  70. GRB 110825A: GROND Observations
  71. GRB 110928A: Enhanced Swift-XRT position
  72. GRB 110928A: P60 Observations
  73. GRB 110928A: Further PAIRITEL NIR Observations
  74. GRB 110928A: Swift-BAT refined analysis
  75. GRB 110928A: Swift-XRT observations
  76. GRB 110928A: Swift/UVOT finding chart observation
  77. GRB 110928A: PAIRITEL NIR Observations
  78. GRB 110928A: ROTSE-III Optical Limits
  79. GRB 110924A: Swift detection of a possible burst
  80. GCN for GRB 110921B
  81. GRB 110921A: Swift/UVOT Observations
  82. GRB 110921A: NOT observations
  83. GRB 110921A: Fermi GBM observation
  84. GRB 110921A: TNT astrometry
  85. GRB 110921A: Swift-XRT refined Analysis
  86. GRB 110921A, Swift-BAT refined analysis
  87. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  88. GRB 110921A: Enhanced Swift-XRT position
  89. GRB 110918A: Swift-XRT refined Analysis
  90. GRB 110921A: Swift detection of a burst
  91. GRB 110915B : X-ray afterglow confirmation
  92. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  93. GRB 110918A optical observation
  94. GRB 110918A: GROND detection of the afterglow candidate
  95. GRB 110918A: INT optical detection of Swift candidate afterglow
  96. GRB 110918A: Swift-XRT observations
  97. GRB110918A: BOOTES-1 optical limit
  98. Swift detection of short bursts from PSR J1647-4552
  99. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  100. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov