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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

39011 results found.

  1. GRB 080723A: optical upper limit
  2. GRB080723B: Swift/UVOT Upper Limits
  3. GRB 080725: REM prompt observations
  4. Konus-Wind observation of GRB 080723B
  5. GRB 080725: Swift detection of a burst
  6. ATCA radio upper limit on GRB 080723B
  7. GRB 080723A: Swift/UVOT Upper Limits
  8. VLA radio upper limit on GRB 080721
  9. GRB 080723B - correction to flux conversion factor
  10. GRB 080723B - Swift-XRT refined analysis
  11. GRB 080723B - Swift-XRT position
  12. GRB 080723, Swift-BAT refined analysis
  13. GRB 080723B: AGILE GRID and MCAL results
  14. GRB 080723B : Planned XMM-Newton observation
  15. GRB 080723A: Swift-XRT refined analysis
  16. GRB 080723B: Detection and Localization by SuperAGILE
  17. GRB 080723B : a long GRB detected with INTEGRAL
  18. GRB 080723: Enhanced Swift-XRT position
  19. GRB 080723: Swift detection of a burst
  20. GRB 080721 : Lulin 2nd optical follow-ups
  21. GRB 080721: OA fading and redshift
  22. TNG/DOLORES redshift for GRB080721
  23. GRB 080721: UVOT Follow-Up Observations
  24. Konus-Wind observation of GRB 080721
  25. GRB 080721: Swift-XRT refined analysis
  26. GRB 080721: Enhanced Swift-XRT position
  27. GRB 080721, Swift-BAT refined analysis
  28. GRB 080721: Swift/UVOT Photometric Redshift
  29. GRB 080721 : Lulin Optical follow-ups
  30. GRB 080721: Swift-XRT correct position
  31. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  32. Retraction of Swift Trigger 317393
  33. Trigger 317393: Swift detection of a possible GRB
  34. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  35. GRB 080714: GROND confirmation of the optical/NIR afterglow
  36. Konus-Wind observation of GRB 080714
  37. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  38. GRB 080714: Swift-XRT refined analysis
  39. GRB 080714: Enhanced Swift-XRT position
  40. GRB 080714: Swift-BAT refined analysis
  41. GRB 080714: Swift detection of a burst
  42. GRB 080702A: optical upper limit
  43. GRB 080603A: CrAO optical observations
  44. GRB 080603B: optical observations in MAO
  45. GRB 080603B: optical observations in CrAO
  46. GRB 080710: Optical observation with MITSuME Okayama
  47. GRB 080710: TLS observations, steepening afterglow decay
  48. GRB 080702B: Swift XRT confirmation of the afterglow
  49. GRB 080710: Lick IR detection
  50. GRB 080710, Swift-BAT refined analysis
  51. GRB 0800707: optical observations
  52. GRB 080710: Rapid PROMPT Observations
  53. GRB 080710: Swift-XRT refined analysis
  54. GRB080710: Swift/UVOT observations
  55. GRB 080710: Enhanced Swift-XRT position
  56. GRB 080710: Faulkes Telescope North observations
  57. GRB 080710: Gemini spectroscopy and probable redshift
  58. UVOT white band observations of GRB080710
  59. GRB 080710: REM afterglow confirmation & brightening
  60. GRB 080710: KAIT OA candidate
  61. GRB 080710: Swift XRT position
  62. GRB 080710: Swift detection of a burst
  63. GRB 080707: possible break in the X-rays
  64. New Swift-XRT GRB products available online.
  65. GRB 080707: GROND Confirmation of the Optical Afterglow
  66. UVOT observations of GRB080707
  67. GRB 080707, Swift-BAT refined analysis
  68. GRB 080707: Swift XRT refined analysis
  69. GRB 080707: Enhanced Swift-XRT position
  70. GRB 080707: VLT redshift
  71. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  72. GRB 080707: Swift detection of a burst
  73. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  74. Trigger 316063: Swift detection of a transient
  75. GRB 080703: GROND Upper Limits
  76. GRB 080702B: GROND Upper Limits
  77. GRB 080703: Swift-XRT refined analysis
  78. GRB 080703: UVOT Follow-Up Observation
  79. GRB 080703: VLT observations of the afterglow
  80. GRB 080703: Enhanced Swift-XRT position
  81. GRB 080703, Swift-BAT refined analysis
  82. GRB 080702B Swift-BAT refined analysis
  83. GRB 080703: Swift detection of a burst with optical afterglow
  84. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  85. No radio detection from the short GRB 080702A
  86. GRB 080702b: LCO optical observations
  87. GRB 080702B: Swift XRT and UVOT observations
  88. GRB 080625: Suzaku WAM observation of the prompt emission
  89. GRB 080702A: MITSuME Akeno optical upper limits
  90. GRB 080701A: Early RAPTOR optical limits
  91. GRB 080702A, Swift-BAT refined analysis
  92. GRB 080702A: Swift-XRT Team refined analysis
  93. GRB 080702B : Burst detected in BAT during Swift slew
  94. GRB 080702A: Enhanced Swift-XRT position
  95. Swift Trigger 315630: Probably not a GRB
  96. GRB 080702: Swift detection of a short burst
  97. GRB 080701: Swift-XRT refined analysis
  98. GRB 080701A, VATT optical upper limit
  99. TLS I-Band Observation of GRB 080701A
  100. GRB 080701A: Swift/UVOT Upper Limits

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