Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

36216 results found.

  1. GRB 111107A: Swift-BAT refined analysis
  2. GRB 111107A: Enhanced Swift-XRT position
  3. GRB 111107A: Gemini-South Redshift
  4. GRB 111107A: GROND observations
  5. Skynet observations of GRB 111107A
  6. GRB 111107A: Swift detection of a burst with an optical counterpart
  7. GRB 111103B: MITSuME Akeno Optical upper limits
  8. Konus-Wind observation of GRB 111103B
  9. GRB 111103B : WIYN 3.5m NIR observations
  10. GRB 111103B: Swift-XRT refined Analysis
  11. GRB 111103A: Fermi GBM observation
  12. GRB111103B Swift/UVOT Upper Limits
  13. GRB 111103B: optical observations from TAU, Ka-Dar
  14. GRB 111103B: Enhanced Swift-XRT position
  15. GRB 111103B: Swift-BAT refined analysis
  16. GRB 111103A: Swift-BAT refined analysis
  17. GRB 111022B: MASTER OT observations
  18. GRB 111103B: optical observations
  19. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  20. GRB 111103A: Swift detection of a burst
  21. Swift-BAT trigger 506884 is not a GRB
  22. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  23. GRB 111029A: SAO RAS optical limits
  24. GRB 111029A: Super-LOTIS early limits
  25. GRB 111026A: spectral lag value inconclusive for a short burst
  26. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  27. GRB 111029A: TNT optical upper limit, Correction to GCN 12503
  28. GRB 111029A: Swift-XRT refined Analysis
  29. GRB 111029A: PAIRITEL NIR Upper Limits
  30. GRB 111026A: Swift-BAT refined analysis
  31. GRB 111029A: Swift/UVOT Upper Limits
  32. GRB 111029A: KAIT optical limits
  33. GRB 111029A: Swift-BAT refined analysis
  34. GRB 111029A: TNT optical upper limit
  35. GRB 111029A: Enhanced Swift-XRT position
  36. GRB 111029A: Faulkes Telescope North observations
  37. GRB 111029A: optical upper limit
  38. GRB 111029A: ROTSE-III Optical Limits
  39. GRB 111029A: Swift detection of a burst
  40. GRB 111026A: Swift detection of a burst
  41. GRB 111022B: EVLA observations - correction to GCN 12495
  42. GRB 111022B: EVLA observations
  43. GRB 111022B: 10.4m GTC z'-band observations
  44. GRB111022B: D50 optical limit
  45. GRB 111020A: Chandra Observation
  46. GRB 111022B: BTA Optical Observations
  47. GRB 111022A: MITSuME Akeno Optical upper limits
  48. GRB 111024A: MAXI/GSC detection of a burst
  49. GRB 111022B: Swift/UVOT upper limits
  50. GRB 111022A: Swift/UVOT Upper Limits
  51. GRB 111016A: optical upper limit
  52. GRB 111022B, Swift-BAT refined analysis
  53. GRB 111022B: Swift-XRT refined Analysis
  54. GRB 111022A: RIzY Observation
  55. GRB 111022A: Swift-XRT refined Analysis
  56. GRB 111022B: Gemini infrared observations
  57. GRB 111022B: MITSuME Akeno Optical upper limits
  58. GRB 111022B: NOT observations
  59. GRB 111022B: Enhanced Swift-XRT position
  60. GRB 111020A Spectral lag analysis
  61. GRB 111022A: Swift-BAT refined analysis
  62. GRB 111022B: MASTER-Net early limit
  63. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  64. GRB 111022A: MASTER-Net early limit
  65. GRB 111022B: Swift detection of a burst
  66. GRB 111022A: Swift detection of a burst
  67. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  68. GRB 111020A: EVLA observations
  69. GRB 111020A: Swift-XRT refined Analysis
  70. GRB 111020A: Gemini-South i-band observations
  71. GRB 111020A: Swift/UVOT Upper Limits
  72. GRB 111020A: Faulkes Telescope South observations
  73. GRB 111020A: Swift-BAT refined analysis
  74. GRB 111020A: Enhanced Swift-XRT position
  75. GRB 111020A: BOOTES-3 Optical Upper Limit.
  76. GRB 111020A: Planned XMM-Newton observation
  77. GRB 111020A: Swift detection of a short burst
  78. GRB 111018A: Swift/UVOT Upper Limits
  79. GRB 110918A: Optical light curve for days 1.4 to 16.3
  80. GRB 111018A: Swift-BAT refined analysis
  81. Konus-Wind observation of GRB 111016B
  82. GRB 111018A: Swift-XRT refined Analysis
  83. GRB 111018A: GROND Upper Limits
  84. GRB 111018A: Enhanced Swift-XRT position
  85. IPN Triangulation of GRB 111016B (long duration, intense)
  86. GRB111016A : WIYN 3.5m NIR observations
  87. GRB 111018A: Swift detection of a burst
  88. GRB 111017A: Fermi GBM Detection
  89. GRB111016A: D50 optical limit
  90. GRB 111016A: Gemini Detection of the NIR Counterpart
  91. GRB 111016A: Swift/UVOT Detection of a Source
  92. GRB 111016A: Swift-BAT refined analysis
  93. GRB 111016A: P60 Afterglow Candidate
  94. GRB 111016A: MITSuME Akeno Optical upper limits
  95. GRB 111016A: Swift-XRT refined Analysis
  96. GRB 111016A: Enhanced Swift-XRT position
  97. GRB 111016A: Swift-XRT observations
  98. GRB 111016A: Swift detection of a burst
  99. GRB 110921A: optical observations
  100. GRB 111008A : miniTAO/ANIR NIR observations

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