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"

42867 results found.

  1. GRB 081226B: Swift XRT and UVOT upper limits
  2. GRB 081224: Suzaku WAM observation of the prompt emission
  3. GRB 081226: Swift-XRT refined analysis
  4. GRB 081226A: Swift UVOT Upper Limits
  5. GRB 081226: Second epoch of Gemini-South imaging
  6. GRB 081226A: Swift-BAT refined analysis
  7. GRB 081226B: a short-hard GRB detected by INTEGRAL
  8. GRB 081226: Gemini-South spectrum of possible afterglow
  9. GRB 081226: Gemini-South imaging
  10. GRB 081226: GROND afterglow candidate
  11. GRB 081226: ROTSE-III Optical Limits
  12. GRB 081226: Swift detection of a possible short-hard burst
  13. GRB 080810: optical observations
  14. GRB 081224: Swift-XRT observation
  15. GRB 081222: MITSuME optical observation
  16. GRB 081224: Fermi GBM Detection & LAT Localization
  17. GRB 080810: optical observations
  18. Konus-Wind observation of GRB 081222
  19. GRB 081223: Fermi GBM detection
  20. GRB 081221: GROND observations
  21. GRB 081222: Gemini-N confirmation of redshift z=2.77
  22. GRB 081222:Optical afterglow observation
  23. VLA radio upper limit on GRB 081222
  24. GRB 081222: Fermi GBM observation
  25. GRB 081222: Gemini-South absorption redshift
  26. GRB081222: Swift/UVOT further observations
  27. GRB 081221: Probable host galaxy in Keck imaging
  28. GRB 081204C: Fermi GBM detection
  29. GRB 081222, Swift-BAT refined analysis
  30. GRB 081221, Swift-BAT refined analysis
  31. GRB081222 optical limit by "Pi of the Sky"
  32. Konus-Wind observation of very bright GRB 081215A
  33. GRB 081222: Swift XRT refined analysis
  34. GRB081221: Fermi GBM observation
  35. Swift/UVOT observations of GRB 081221
  36. IPN triangulation of bright GRB 081215A
  37. GRB 081221: Swift-XRT Refined Analysis
  38. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  39. GRB 081222: Faulkes Telescope South observations
  40. GRB 081221: Gemini-N nIR imaging
  41. GRB081222: Swift/UVOT detection of an optical afterglow
  42. GRB081203A: BTA observation
  43. Konus-Wind observation of GRB 081221
  44. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  45. GRB081222: REM candidate afterglow
  46. GRB 081222: Swift detection of a burst with a bright optical afterglow
  47. GRB 081221: Enhanced Swift-XRT position
  48. GRB 081221: further NOT observations
  49. GRB 081221: NOT observations
  50. GRB 081221: Swift detection of a burst
  51. GRB 081217: Fermi GBM detection
  52. Modification of Swift/UVOT response to bright GRBs
  53. GRB081215A: Fermi-LAT observations
  54. GRB 081211B: Further Swift-XRT analysis
  55. GRB 081215B: Fermi GBM detection
  56. GRB 081216: Suzaku WAM observation of the prompt emission
  57. GRB 081216 : Fermi GBM observation
  58. GRB 081215A: Fermi GBM detection
  59. IPN localization of short hard GRB 081216
  60. GRB 081211B - possibly a short burst with extended emission
  61. GRB 081118: Zadko observations
  62. GRB 081213: Fermi GBM detection
  63. Possible GRB 081211B - Swift-XRT analysis
  64. GRB 081207: Fermi GBM detection
  65. GRB 081209: Fermi GBM detection
  66. GRB 081007: Detection of a Supernova
  67. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  68. GRB 081210, SMARTS optical/IR observations
  69. GRB 081211: Swift XRT refined analysis
  70. GRB 081211: Swift/UVOT detection of an optical afterglow
  71. GRB 081211: Enhanced Swift-XRT position
  72. GRB 081210: Swift/UVOT refined analysis
  73. GRB 081211: Swift detection of a burst
  74. GRB 081210: Swift-XRT refined analysis
  75. GRB081203B: optical observations
  76. GRB 081210: Enhanced Swift-XRT position
  77. GRB 081210: Swift-BAT refined analysis
  78. GRB 081210: Swift detection of a burst with optical afterglow
  79. Konus-Wind observation of GRB 081209
  80. IPN triangulation of short hard GRB 081209
  81. GRB 081203A: optical observations
  82. GRB 081206C: Fermi GBM detection
  83. Radio observation of GRB 081121 with ATCA
  84. Radio observation of GRB 081118 with ATCA
  85. GRB 081206B: Fermi GBM detection
  86. GRB 081206: Fermi GBM detection
  87. GRB 081128: afterglow observations
  88. GRB 081203B: Suzaku WAM observation of the prompt emission
  89. Radio observation of GRB 081109 with ATCA
  90. Radio observation of GRB 081104 with ATCA
  91. Radio observation of GRB 081029 with ATCA
  92. Radio observation of GRB 081008 with ATCA
  93. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  94. GRB 081203B: Gemini observations
  95. GRB 081128: optical observation in CrAO
  96. GRB081203A: Optical observations at Ishigaki
  97. GRB 081128: Optical afterglow observations
  98. GRB 081204: GROND Observations
  99. Radio detection of GRB 081203B with the VLA
  100. GRB 081204: Magellan 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