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"

36397 results found.

  1. GRB 111029A: Swift/UVOT Upper Limits
  2. GRB 111029A: KAIT optical limits
  3. GRB 111029A: Swift-BAT refined analysis
  4. GRB 111029A: TNT optical upper limit
  5. GRB 111029A: Enhanced Swift-XRT position
  6. GRB 111029A: Faulkes Telescope North observations
  7. GRB 111029A: optical upper limit
  8. GRB 111029A: ROTSE-III Optical Limits
  9. GRB 111029A: Swift detection of a burst
  10. GRB 111026A: Swift detection of a burst
  11. GRB 111022B: EVLA observations - correction to GCN 12495
  12. GRB 111022B: EVLA observations
  13. GRB 111022B: 10.4m GTC z'-band observations
  14. GRB111022B: D50 optical limit
  15. GRB 111020A: Chandra Observation
  16. GRB 111022B: BTA Optical Observations
  17. GRB 111022A: MITSuME Akeno Optical upper limits
  18. GRB 111024A: MAXI/GSC detection of a burst
  19. GRB 111022B: Swift/UVOT upper limits
  20. GRB 111022A: Swift/UVOT Upper Limits
  21. GRB 111016A: optical upper limit
  22. GRB 111022B, Swift-BAT refined analysis
  23. GRB 111022B: Swift-XRT refined Analysis
  24. GRB 111022A: RIzY Observation
  25. GRB 111022A: Swift-XRT refined Analysis
  26. GRB 111022B: Gemini infrared observations
  27. GRB 111022B: MITSuME Akeno Optical upper limits
  28. GRB 111022B: NOT observations
  29. GRB 111022B: Enhanced Swift-XRT position
  30. GRB 111020A Spectral lag analysis
  31. GRB 111022A: Swift-BAT refined analysis
  32. GRB 111022B: MASTER-Net early limit
  33. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  34. GRB 111022A: MASTER-Net early limit
  35. GRB 111022B: Swift detection of a burst
  36. GRB 111022A: Swift detection of a burst
  37. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  38. GRB 111020A: EVLA observations
  39. GRB 111020A: Swift-XRT refined Analysis
  40. GRB 111020A: Gemini-South i-band observations
  41. GRB 111020A: Swift/UVOT Upper Limits
  42. GRB 111020A: Faulkes Telescope South observations
  43. GRB 111020A: Swift-BAT refined analysis
  44. GRB 111020A: Enhanced Swift-XRT position
  45. GRB 111020A: BOOTES-3 Optical Upper Limit.
  46. GRB 111020A: Planned XMM-Newton observation
  47. GRB 111020A: Swift detection of a short burst
  48. GRB 111018A: Swift/UVOT Upper Limits
  49. GRB 110918A: Optical light curve for days 1.4 to 16.3
  50. GRB 111018A: Swift-BAT refined analysis
  51. Konus-Wind observation of GRB 111016B
  52. GRB 111018A: Swift-XRT refined Analysis
  53. GRB 111018A: GROND Upper Limits
  54. GRB 111018A: Enhanced Swift-XRT position
  55. IPN Triangulation of GRB 111016B (long duration, intense)
  56. GRB111016A : WIYN 3.5m NIR observations
  57. GRB 111018A: Swift detection of a burst
  58. GRB 111017A: Fermi GBM Detection
  59. GRB111016A: D50 optical limit
  60. GRB 111016A: Gemini Detection of the NIR Counterpart
  61. GRB 111016A: Swift/UVOT Detection of a Source
  62. GRB 111016A: Swift-BAT refined analysis
  63. GRB 111016A: P60 Afterglow Candidate
  64. GRB 111016A: MITSuME Akeno Optical upper limits
  65. GRB 111016A: Swift-XRT refined Analysis
  66. GRB 111016A: Enhanced Swift-XRT position
  67. GRB 111016A: Swift-XRT observations
  68. GRB 111016A: Swift detection of a burst
  69. GRB 110921A: optical observations
  70. GRB 111008A : miniTAO/ANIR NIR observations
  71. EVLA 22 GHz Detection of GRB 111008A
  72. GRB 111005A: ATCA 18 GHz decay
  73. GRB 111008A: Swift/UVOT Upper Limits
  74. Konus-Wind observation of GRB 111008A
  75. GRB 111008A: IAC80 I-band observations
  76. GRB 111008A: VLT/X-shooter spectroscopy
  77. GRB 111008A: Swift-XRT refined Analysis
  78. GRB 111008A: Gemini spectroscopic redshift
  79. GRB 111008A, GROND observations
  80. GRB 111008A: NOT optical observation
  81. GRB 111008A: Gemini optical counterpart
  82. GRB 111008A: Enhanced Swift-XRT position
  83. GRB 111008A, Swift-BAT refined analysis,
  84. GRB 111008A: Swift detection of a burst
  85. GRB 111005A: ATCA 18 GHz detection
  86. GRB 111005A: ATCA radio upper limit
  87. GRB 111005A : miniTAO/ANIR NIR observations
  88. GRB 111005A: EVLA Observations
  89. GRB 111005A: VLT optical observations
  90. GRB 111005A: GROND NIR observations
  91. GRB 111005A: VLT IR observations
  92. GRB 111005A: Swift-BAT refined analysis
  93. GRB 111005A: bright galaxy in error circle
  94. GRB 111005A: Swift detection of a burst
  95. GRB 111003A: Fermi GBM detection
  96. GRB 110905A / MAXI J1836-194: optical monitoring
  97. GRB 110921A: MITSuME-Akeno Optical photometry
  98. Skynet/Dolomiti observations of GRB 110928A
  99. Skynet observations of GRB 110928A
  100. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval

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