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"

45997 results found.

  1. GRB 111103B: Swift-BAT refined analysis
  2. GRB 111103A: Swift-BAT refined analysis
  3. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  4. GRB 111022B: MASTER OT observations
  5. GRB 111103B: optical observations
  6. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  7. GRB 111103A: Swift detection of a burst
  8. Swift-BAT trigger 506884 is not a GRB
  9. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  10. GRB 111029A: SAO RAS optical limits
  11. GRB 111029A: Super-LOTIS early limits
  12. All GCN Circulars available in a tarfile for data mining
  13. GRB 111026A: spectral lag value inconclusive for a short burst
  14. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  15. GRB 111029A: TNT optical upper limit, Correction to GCN 12503
  16. GRB 111029A: Swift-XRT refined Analysis
  17. GRB 111029A: PAIRITEL NIR Upper Limits
  18. GRB 111026A: Swift-BAT refined analysis
  19. GRB 111029A: Swift/UVOT Upper Limits
  20. GRB 111029A: KAIT optical limits
  21. GRB 111029A: Swift-BAT refined analysis
  22. GRB 111029A: TNT optical upper limit
  23. GRB 111029A: Enhanced Swift-XRT position
  24. GRB 111029A: Faulkes Telescope North observations
  25. GRB 111029A: optical upper limit
  26. GRB 111029A: ROTSE-III Optical Limits
  27. GRB 111029A: Swift detection of a burst
  28. GRB 111026A: Swift detection of a burst
  29. GRB 111022B: EVLA observations - correction to GCN 12495
  30. GRB 111022B: EVLA observations
  31. GRB 111022B: 10.4m GTC z'-band observations
  32. GRB111022B: D50 optical limit
  33. GRB 111020A: Chandra Observation
  34. GRB 111022B: BTA Optical Observations
  35. GRB 111022A: MITSuME Akeno Optical upper limits
  36. GRB 111024A: MAXI/GSC detection of a burst
  37. GRB 111022B: Swift/UVOT upper limits
  38. GRB 111022A: Swift/UVOT Upper Limits
  39. GRB 111016A: optical upper limit
  40. GRB 111022B, Swift-BAT refined analysis
  41. GRB 111022B: Swift-XRT refined Analysis
  42. GRB 111022A: RIzY Observation
  43. GRB 111022A: Swift-XRT refined Analysis
  44. GRB 111022B: Gemini infrared observations
  45. GRB 111022B: MITSuME Akeno Optical upper limits
  46. GRB 111022B: NOT observations
  47. GRB 111022B: Enhanced Swift-XRT position
  48. GRB 111020A Spectral lag analysis
  49. GRB 111022A: Swift-BAT refined analysis
  50. GRB 111022B: MASTER-Net early limit
  51. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  52. GRB 111022A: MASTER-Net early limit
  53. GRB 111022B: Swift detection of a burst
  54. GRB 111022A: Swift detection of a burst
  55. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  56. GRB 111020A: EVLA observations
  57. GRB 111020A: Swift-XRT refined Analysis
  58. GRB 111020A: Gemini-South i-band observations
  59. GRB 111020A: Swift/UVOT Upper Limits
  60. GRB 111020A: Faulkes Telescope South observations
  61. GRB 111020A: Swift-BAT refined analysis
  62. GRB 111020A: Enhanced Swift-XRT position
  63. GRB 111020A: BOOTES-3 Optical Upper Limit.
  64. GRB 111020A: Planned XMM-Newton observation
  65. GRB 111020A: Swift detection of a short burst
  66. GRB 111018A: Swift/UVOT Upper Limits
  67. GRB 110918A: Optical light curve for days 1.4 to 16.3
  68. GRB 111018A: Swift-BAT refined analysis
  69. Konus-Wind observation of GRB 111016B
  70. GRB 111018A: Swift-XRT refined Analysis
  71. GRB 111018A: GROND Upper Limits
  72. GRB 111018A: Enhanced Swift-XRT position
  73. IPN Triangulation of GRB 111016B (long duration, intense)
  74. GRB111016A : WIYN 3.5m NIR observations
  75. GRB 111018A: Swift detection of a burst
  76. GRB 111017A: Fermi GBM Detection
  77. GRB111016A: D50 optical limit
  78. GRB 111016A: Gemini Detection of the NIR Counterpart
  79. GRB 111016A: Swift/UVOT Detection of a Source
  80. GRB 111016A: Swift-BAT refined analysis
  81. GRB 111016A: P60 Afterglow Candidate
  82. GRB 111016A: MITSuME Akeno Optical upper limits
  83. GRB 111016A: Swift-XRT refined Analysis
  84. GRB 111016A: Enhanced Swift-XRT position
  85. GRB 111016A: Swift-XRT observations
  86. GRB 111016A: Swift detection of a burst
  87. GRB 110921A: optical observations
  88. GRB 111008A : miniTAO/ANIR NIR observations
  89. EVLA 22 GHz Detection of GRB 111008A
  90. GRB 111005A: ATCA 18 GHz decay
  91. GRB 111008A: Swift/UVOT Upper Limits
  92. Konus-Wind observation of GRB 111008A
  93. GRB 111008A: IAC80 I-band observations
  94. GRB 111008A: VLT/X-shooter spectroscopy
  95. GRB 111008A: Swift-XRT refined Analysis
  96. GRB 111008A: Gemini spectroscopic redshift
  97. GRB 111008A, GROND observations
  98. GRB 111008A: NOT optical observation
  99. GRB 111008A: Gemini optical counterpart
  100. GRB 111008A: Enhanced Swift-XRT position

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