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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"

32504 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. ATCA radio upper limit on GRB 080723B
  6. GRB 080723A: Swift/UVOT Upper Limits
  7. VLA radio upper limit on GRB 080721
  8. GRB 080723B - correction to flux conversion factor
  9. GRB 080723B - Swift-XRT refined analysis
  10. GRB 080723B - Swift-XRT position
  11. GRB 080723, Swift-BAT refined analysis
  12. GRB 080723B: AGILE GRID and MCAL results
  13. GRB 080723A: Swift-XRT refined analysis
  14. GRB 080723B: Detection and Localization by SuperAGILE
  15. GRB 080721 : Lulin 2nd optical follow-ups
  16. GRB 080721: OA fading and redshift
  17. TNG/DOLORES redshift for GRB080721
  18. GRB 080721: UVOT Follow-Up Observations
  19. Konus-Wind observation of GRB 080721
  20. GRB 080721: Swift-XRT refined analysis
  21. GRB 080721, Swift-BAT refined analysis
  22. GRB 080721: Swift/UVOT Photometric Redshift
  23. GRB 080721 : Lulin Optical follow-ups
  24. GRB 080721: Swift-XRT correct position
  25. Retraction of Swift Trigger 317393
  26. GRB 080714: GROND confirmation of the optical/NIR afterglow
  27. Konus-Wind observation of GRB 080714
  28. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  29. GRB 080714: Swift-XRT refined analysis
  30. GRB 080714: Swift-BAT refined analysis
  31. GRB 080702A: optical upper limit
  32. GRB 080603A: CrAO optical observations
  33. GRB 080603B: optical observations in MAO
  34. GRB 080603B: optical observations in CrAO
  35. GRB 080710: Optical observation with MITSuME Okayama
  36. GRB 080710: TLS observations, steepening afterglow decay
  37. GRB 080702B: Swift XRT confirmation of the afterglow
  38. GRB 080710, Swift-BAT refined analysis
  39. GRB 0800707: optical observations
  40. GRB 080710: Rapid PROMPT Observations
  41. GRB 080710: Swift-XRT refined analysis
  42. GRB080710: Swift/UVOT observations
  43. GRB 080710: Faulkes Telescope North observations
  44. GRB 080710: Gemini spectroscopy and probable redshift
  45. UVOT white band observations of GRB080710
  46. GRB 080710: REM afterglow confirmation & brightening
  47. GRB 080710: KAIT OA candidate
  48. GRB 080707: possible break in the X-rays
  49. New Swift-XRT GRB products available online.
  50. GRB 080707: GROND Confirmation of the Optical Afterglow
  51. UVOT observations of GRB080707
  52. GRB 080707, Swift-BAT refined analysis
  53. GRB 080707: Swift XRT refined analysis
  54. GRB 080707: VLT redshift
  55. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  56. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  57. GRB 080703: GROND Upper Limits
  58. GRB 080702B: GROND Upper Limits
  59. GRB 080703: Swift-XRT refined analysis
  60. GRB 080703: UVOT Follow-Up Observation
  61. GRB 080703: VLT observations of the afterglow
  62. GRB 080703, Swift-BAT refined analysis
  63. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  64. No radio detection from the short GRB 080702A
  65. GRB 080702b: LCO optical observations
  66. Swift/UVOT observation of GRB080702A
  67. GRB 080702B: Swift XRT and UVOT observations
  68. GRB 080625: Suzaku WAM observation of the prompt emission
  69. GRB 080702A: MITSuME Akeno optical upper limits
  70. GRB 080701A: Early RAPTOR optical limits
  71. Swift Trigger 315630: Swift/UVOT Upper Limits
  72. GRB 080702A, Swift-BAT refined analysis
  73. GRB 080702A: Swift-XRT Team refined analysis
  74. Swift Trigger 315630: TLS R-band observation
  75. Swift Trigger 315630: Probably not a GRB
  76. GRB 080701: Swift-XRT refined analysis
  77. GRB 080701A, VATT optical upper limit
  78. TLS I-Band Observation of GRB 080701A
  79. GRB 080701A: Swift/UVOT Upper Limits
  80. GRB 080701A: Early Super-LOTIS Observations
  81. GRB 080701A, Swift-BAT refined analysis
  82. GRB 080623: Suzaku WAM observation of the prompt emission
  83. GRB 080625: Swift/UVOT Follow-Up Observations
  84. GRB 080625: Further observations from OSN
  85. GRB 080625:Swift-XRT detection of the afterglow
  86. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  87. GRB 080625: Observations at OSN
  88. GRB 080623: GROND upper limits
  89. GRB080623: Swift UVOT followup observations
  90. GRB 080623: Swift-XRT refined analysis
  91. GRB 080623, Swift-BAT refined analysis
  92. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  93. Swift trigger 314975 is not a GRB
  94. GRB080607: optical observation
  95. GRB 080603b: optical observation
  96. GRB 070809: Putative host galaxy and redshift
  97. VLA upper limit on INTEGRAL burst GRB 080613A
  98. GRB 0800603A: optical observation
  99. GRB080613B: MITSuME upper limits
  100. GRB080613A: Optical upper limits with Okayama MITSuME telescope

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