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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"

28103 results found.

  1. GRB 100514A: Swift-BAT refined analysis
  2. GRB 100514A: Swift detection of a burst
  3. GRB 100513A: Swift/UVOT upper limits
  4. GRB 100513A, RIMOTS optical upper limits
  5. GRB 100513A: Swift XRT refined analysis
  6. GRB 100513A: Swift-BAT refined analysis
  7. GRB 100513A: Enhanced Swift-XRT position
  8. GRB 100513A: SARA-N Upper Limit
  9. GRB 100513A: Swift detection of a burst
  10. GRB 100510A: Fermi GBM detection/observation
  11. GRB 100511A: Fermi GBM detection/observation
  12. GRB 100511A: Super-LOTIS early observations
  13. Swift-BAT trigger 421695 is likely not astrophysical
  14. GRB100504A: Optical upper limits at IAO
  15. GRB 100510A: MAXI/GSC detection
  16. GRB 100511A, RIMOTS optical upper limits
  17. Trigger 421695: Swift detection of a possible burst
  18. GRB100503A: Suzaku WAM observation of the prompt emission
  19. GRB 100508A: GROND Detection of the optical afterglow
  20. GRB 100508A: Swift-XRT Refined analysis
  21. GRB 100508A: Swift-BAT refined analysis
  22. GRB 100508A: Enhanced Swift-XRT position
  23. GRB100508A: Swift/UVOT Detection of the Afterglow
  24. GRB 100508A: ROTSE-III Optical Limits
  25. GRB 100508A: Swift detection of a burst
  26. GRB 100418A: Keck imaging
  27. GRB 100418A: RTT150 optical observations
  28. Swift-BAT refined analysis of trigger 421262
  29. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  30. GRB 100504A: Swift/UVOT Observations
  31. GRB 100504A: Swift-XRT refined analysis
  32. GRB 100504A: Enhanced Swift-XRT position
  33. GRB 100504A: GROND Upper limits
  34. GRB 100504A: Swift-BAT refined analysis
  35. GRB 100504A: SARA-South Upper Limit
  36. GRB 100503A: Fermi GBM detection
  37. GRB 100504A: Swift detection of a burst
  38. INTEGRAL observations of Swift GRB trigger 421072
  39. GRB100423A : Suzaku WAM observation of the prompt emission
  40. Trigger 421072: Possible Swift detection of a GRB or transient
  41. GRB 100420A: Terskol optical upper limit
  42. GRB 100427A: Swift XRT and UVOT Upper Limits
  43. GRB 100427A: Fermi GBM detection
  44. GRB 100414A : EVLA Radio Detection
  45. GRB 100414A : WSRT Radio Detection
  46. GRB 100423A: CrAO optical observations
  47. GRB 100418A: Terskol optical observations
  48. GRB 100424A: CrAO optical observations
  49. GRB 100424A: NIR Afterglow Confirmation
  50. GRB 100425A: Swift XRT refined analysis
  51. GRB 100424A: Gemini/NIRI H-band observations
  52. GRB100425A: Swift/UVOT Upper Limits
  53. GRB 100424A: Swift/UVOT Upper Limits
  54. GRB 100424A: Liverpool Telescope Upper Limits
  55. GRB 100425A: Enhanced Swift-XRT position
  56. GRB 100425A: Swift-BAT refined analysis
  57. GRB 100425A: GROND afterglow observation
  58. GRB 100424A: Gemini/NIRI Candidate Afterglow
  59. GRB 100424A: D50 optical limits
  60. GRB 100425A: candidate optical afterglow from the VLT
  61. GRB100424A: MITSuME optical upper limits
  62. GRB100423A: MITSuME optical upper limits
  63. GRB 100424A : Lulin early z'-band upper limit
  64. GRB 100424A: GROND Upper Limits
  65. GRB 100424A: PAIRITEL NIR Upper Limits
  66. GRB 100424A: Swift-XRT refined analysis
  67. GRB 100425A: Swift detection of a burst
  68. GRB 100424A: NOT optical observations
  69. GRB 100424A, Swift-BAT refined analysis
  70. GRB 100424A: Enhanced Swift-XRT position
  71. GRB 100424A: Prompt enhanced Swift-XRT position.
  72. GRB 100424A: Swift detection of a burst
  73. GRB 100420A: GRT Optical Observation
  74. Swift Trigger 420256: D50 optical limits
  75. GRB 100423B: Fermi GBM detection
  76. GRB 100423A: Swift-BAT refined analysis
  77. Swift Trigger 420256: IAC80 R-band observations
  78. Swift Trigger 420256: BOOTES-2 observations
  79. Trigger 420256: Swift detection of a possible GRB
  80. GRB 100423A: GROND discovery of afterglow
  81. GRB 100418A: Continued PAIRITEL NIR Observations
  82. GRB100418A: REM possible afterglow detection
  83. GRB 100418A: Continuing Swift/UVOT Observations
  84. GRB100420A: MITSuME optical upper limits
  85. GRB 100414A: CFHT optical observations
  86. GRB 100420A: Swift/UVOT Upper Limits
  87. GRB 100420A: XRT refined analysis
  88. GRB 100420A: Enhanced Swift-XRT position
  89. GRB 100418A: SARA second epoch
  90. GRB 100420A: SARA Upper Limits
  91. GRB 100418A: optical observations
  92. GRB 100414A: Confirmation of the X-ray afterglow
  93. GRB 100418A: SMA submm detection
  94. GRB 100420A: Swift detection of a burst
  95. GRB 100418A PAIRITEL NIR Observations
  96. GRB 100418A: Swift/UVOT Observations
  97. GRB 100418A: Gemini-N redshift confirmation
  98. GRB 100418A: Swift-XRT Refined Analysis
  99. GRB100418A: VLT/X-shooter redshift and photometry
  100. GRB 100418A: SARA observations

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