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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"

32495 results found.

  1. GRB 080723B - Swift-XRT position
  2. GRB 080723, Swift-BAT refined analysis
  3. GRB 080723B: AGILE GRID and MCAL results
  4. GRB 080723A: Swift-XRT refined analysis
  5. GRB 080723B: Detection and Localization by SuperAGILE
  6. GRB 080721 : Lulin 2nd optical follow-ups
  7. GRB 080721: OA fading and redshift
  8. TNG/DOLORES redshift for GRB080721
  9. GRB 080721: UVOT Follow-Up Observations
  10. Konus-Wind observation of GRB 080721
  11. GRB 080721: Swift-XRT refined analysis
  12. GRB 080721, Swift-BAT refined analysis
  13. GRB 080721: Swift/UVOT Photometric Redshift
  14. GRB 080721 : Lulin Optical follow-ups
  15. GRB 080721: Swift-XRT correct position
  16. Retraction of Swift Trigger 317393
  17. GRB 080714: GROND confirmation of the optical/NIR afterglow
  18. Konus-Wind observation of GRB 080714
  19. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  20. GRB 080714: Swift-XRT refined analysis
  21. GRB 080714: Swift-BAT refined analysis
  22. GRB 080702A: optical upper limit
  23. GRB 080603A: CrAO optical observations
  24. GRB 080603B: optical observations in MAO
  25. GRB 080603B: optical observations in CrAO
  26. GRB 080710: Optical observation with MITSuME Okayama
  27. GRB 080710: TLS observations, steepening afterglow decay
  28. GRB 080702B: Swift XRT confirmation of the afterglow
  29. GRB 080710, Swift-BAT refined analysis
  30. GRB 0800707: optical observations
  31. GRB 080710: Rapid PROMPT Observations
  32. GRB 080710: Swift-XRT refined analysis
  33. GRB080710: Swift/UVOT observations
  34. GRB 080710: Faulkes Telescope North observations
  35. GRB 080710: Gemini spectroscopy and probable redshift
  36. UVOT white band observations of GRB080710
  37. GRB 080710: REM afterglow confirmation & brightening
  38. GRB 080710: KAIT OA candidate
  39. GRB 080707: possible break in the X-rays
  40. New Swift-XRT GRB products available online.
  41. GRB 080707: GROND Confirmation of the Optical Afterglow
  42. UVOT observations of GRB080707
  43. GRB 080707, Swift-BAT refined analysis
  44. GRB 080707: Swift XRT refined analysis
  45. GRB 080707: VLT redshift
  46. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  47. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  48. GRB 080703: GROND Upper Limits
  49. GRB 080702B: GROND Upper Limits
  50. GRB 080703: Swift-XRT refined analysis
  51. GRB 080703: UVOT Follow-Up Observation
  52. GRB 080703: VLT observations of the afterglow
  53. GRB 080703, Swift-BAT refined analysis
  54. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  55. No radio detection from the short GRB 080702A
  56. GRB 080702b: LCO optical observations
  57. Swift/UVOT observation of GRB080702A
  58. GRB 080702B: Swift XRT and UVOT observations
  59. GRB 080625: Suzaku WAM observation of the prompt emission
  60. GRB 080702A: MITSuME Akeno optical upper limits
  61. GRB 080701A: Early RAPTOR optical limits
  62. Swift Trigger 315630: Swift/UVOT Upper Limits
  63. GRB 080702A, Swift-BAT refined analysis
  64. GRB 080702A: Swift-XRT Team refined analysis
  65. Swift Trigger 315630: TLS R-band observation
  66. Swift Trigger 315630: Probably not a GRB
  67. GRB 080701: Swift-XRT refined analysis
  68. GRB 080701A, VATT optical upper limit
  69. TLS I-Band Observation of GRB 080701A
  70. GRB 080701A: Swift/UVOT Upper Limits
  71. GRB 080701A: Early Super-LOTIS Observations
  72. GRB 080701A, Swift-BAT refined analysis
  73. GRB 080623: Suzaku WAM observation of the prompt emission
  74. GRB 080625: Swift/UVOT Follow-Up Observations
  75. GRB 080625: Further observations from OSN
  76. GRB 080625:Swift-XRT detection of the afterglow
  77. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  78. GRB 080625: Observations at OSN
  79. GRB 080623: GROND upper limits
  80. GRB080623: Swift UVOT followup observations
  81. GRB 080623: Swift-XRT refined analysis
  82. GRB 080623, Swift-BAT refined analysis
  83. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  84. Swift trigger 314975 is not a GRB
  85. GRB080607: optical observation
  86. GRB 080603b: optical observation
  87. GRB 070809: Putative host galaxy and redshift
  88. VLA upper limit on INTEGRAL burst GRB 080613A
  89. GRB 0800603A: optical observation
  90. GRB080613B: MITSuME upper limits
  91. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  92. Konus-Wind observation of GRB 080613B
  93. GRB 080603A: optical observations on June 04
  94. GRB 080613A: Swift-XRT detection of the afterglow
  95. GRB080613A: Swift/UVOT Upper Limits
  96. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  97. GRB 080613B: GROND Upper Limits
  98. GRB 080613B - NOT optical and IR nondetections
  99. GRB080613B: Swift/UVOT Upper Limits
  100. GRB 080613B, Swift-BAT refined analysis

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