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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"

31632 results found.

  1. GRB 080804: ROTSE-III Detection of Optical Counterpart
  2. GRB 080802: Swift/UVOT Upper Limits
  3. GRB 080802: Swift-XRT Refined Analysis
  4. GRB 080802: UVI Telescope Upper Limit
  5. GRB 080802, Swift-BAT refined analysis
  6. GRB 080727C: Suzaku WAM observation of the prompt emission
  7. GRB 080727B: IR photometry
  8. GRB 080727A: Early IR observations
  9. GRB 080727C: TAROT Calern observatory optical observations
  10. GRB 080727B: KAIT photometry and an early lightcurve break
  11. GRB 080727B: GROND redshift limit
  12. GRB 080727C, Swift-BAT refined analysis
  13. GRB 080727C: Swift/UVOT Upper Limits
  14. Konus-Wind observation of GRB 080727B
  15. GRB 080727C: Swift XRT refined analysis
  16. GRB 080727C: Liverpool Telescope observations
  17. GRB 080727A: VLT upper limits
  18. GRB 080727B: REM NIR afterglow prompt detection
  19. GRB080727C: RTT150 optical observations
  20. GRB 080727B: Swift/UVOT Upper Limits
  21. GRB 080727B: Swift-XRT refined analysis
  22. GRB 080727B, Swift-BAT refined analysis
  23. GRB 080727A, Swift-BAT refined analysis
  24. GRB 080727A: Swift-XRT refined analysis
  25. GRB080727A: Swift/UVOT Upper Limits
  26. GRB 080727B: KAIT observations
  27. GRB 080727B: REM prompt observations
  28. GRB 080725, Swift-BAT refined analysis
  29. GRB 080723A: optical upper limit
  30. GRB080723B: Swift/UVOT Upper Limits
  31. GRB 080725: REM prompt observations
  32. Konus-Wind observation of GRB 080723B
  33. ATCA radio upper limit on GRB 080723B
  34. GRB 080723A: Swift/UVOT Upper Limits
  35. VLA radio upper limit on GRB 080721
  36. GRB 080723B - correction to flux conversion factor
  37. GRB 080723B - Swift-XRT refined analysis
  38. GRB 080723B - Swift-XRT position
  39. GRB 080723, Swift-BAT refined analysis
  40. GRB 080723B: AGILE GRID and MCAL results
  41. GRB 080723A: Swift-XRT refined analysis
  42. GRB 080723B: Detection and Localization by SuperAGILE
  43. GRB 080721 : Lulin 2nd optical follow-ups
  44. GRB 080721: OA fading and redshift
  45. TNG/DOLORES redshift for GRB080721
  46. GRB 080721: UVOT Follow-Up Observations
  47. Konus-Wind observation of GRB 080721
  48. GRB 080721: Swift-XRT refined analysis
  49. GRB 080721, Swift-BAT refined analysis
  50. GRB 080721: Swift/UVOT Photometric Redshift
  51. GRB 080721 : Lulin Optical follow-ups
  52. GRB 080721: Swift-XRT correct position
  53. Retraction of Swift Trigger 317393
  54. GRB 080714: GROND confirmation of the optical/NIR afterglow
  55. Konus-Wind observation of GRB 080714
  56. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  57. GRB 080714: Swift-XRT refined analysis
  58. GRB 080714: Swift-BAT refined analysis
  59. GRB 080702A: optical upper limit
  60. GRB 080603A: CrAO optical observations
  61. GRB 080603B: optical observations in MAO
  62. GRB 080603B: optical observations in CrAO
  63. GRB 080710: Optical observation with MITSuME Okayama
  64. GRB 080710: TLS observations, steepening afterglow decay
  65. GRB 080702B: Swift XRT confirmation of the afterglow
  66. GRB 080710, Swift-BAT refined analysis
  67. GRB 0800707: optical observations
  68. GRB 080710: Rapid PROMPT Observations
  69. GRB 080710: Swift-XRT refined analysis
  70. GRB080710: Swift/UVOT observations
  71. GRB 080710: Faulkes Telescope North observations
  72. GRB 080710: Gemini spectroscopy and probable redshift
  73. UVOT white band observations of GRB080710
  74. GRB 080710: REM afterglow confirmation & brightening
  75. GRB 080710: KAIT OA candidate
  76. GRB 080707: possible break in the X-rays
  77. New Swift-XRT GRB products available online.
  78. GRB 080707: GROND Confirmation of the Optical Afterglow
  79. UVOT observations of GRB080707
  80. GRB 080707, Swift-BAT refined analysis
  81. GRB 080707: Swift XRT refined analysis
  82. GRB 080707: VLT redshift
  83. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  84. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  85. GRB 080703: GROND Upper Limits
  86. GRB 080702B: GROND Upper Limits
  87. GRB 080703: Swift-XRT refined analysis
  88. GRB 080703: UVOT Follow-Up Observation
  89. GRB 080703: VLT observations of the afterglow
  90. GRB 080703, Swift-BAT refined analysis
  91. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  92. No radio detection from the short GRB 080702A
  93. GRB 080702b: LCO optical observations
  94. Swift/UVOT observation of GRB080702A
  95. GRB 080702B: Swift XRT and UVOT observations
  96. GRB 080625: Suzaku WAM observation of the prompt emission
  97. GRB 080702A: MITSuME Akeno optical upper limits
  98. GRB 080701A: Early RAPTOR optical limits
  99. Swift Trigger 315630: Swift/UVOT Upper Limits
  100. GRB 080702A, Swift-BAT refined analysis

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