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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"

26503 results found.

  1. GRB 080723B - Swift-XRT refined analysis
  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 080723: Enhanced Swift-XRT position
  7. GRB 080723: Swift detection of a burst
  8. GRB 080721: Swift-XRT refined analysis
  9. GRB 080721: Enhanced Swift-XRT position
  10. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  11. Trigger 317393: Swift detection of a possible GRB
  12. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  13. GRB 080714: GROND confirmation of the optical/NIR afterglow
  14. Konus-Wind observation of GRB 080714
  15. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  16. GRB 080714: Swift-XRT refined analysis
  17. GRB 080714: Enhanced Swift-XRT position
  18. GRB 080714: Swift-BAT refined analysis
  19. GRB 080714: Swift detection of a burst
  20. GRB 080702A: optical upper limit
  21. GRB 080603A: CrAO optical observations
  22. GRB 080710: TLS observations, steepening afterglow decay
  23. GRB 080702B: Swift XRT confirmation of the afterglow
  24. GRB 080710: Lick IR detection
  25. GRB 080710: Swift-XRT refined analysis
  26. GRB080710: Swift/UVOT observations
  27. GRB 080710: Enhanced Swift-XRT position
  28. UVOT white band observations of GRB080710
  29. GRB 080710: REM afterglow confirmation & brightening
  30. GRB 080710: Swift XRT position
  31. New Swift-XRT GRB products available online.
  32. GRB 080707: GROND Confirmation of the Optical Afterglow
  33. UVOT observations of GRB080707
  34. GRB 080707, Swift-BAT refined analysis
  35. GRB 080707: Swift XRT refined analysis
  36. GRB 080707: Enhanced Swift-XRT position
  37. GRB 080707: VLT redshift
  38. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  39. GRB 080707: Swift detection of a burst
  40. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  41. Trigger 316063: Swift detection of a transient
  42. GRB 080703: GROND Upper Limits
  43. GRB 080702B: GROND Upper Limits
  44. GRB 080703: Swift-XRT refined analysis
  45. GRB 080703: VLT observations of the afterglow
  46. GRB 080703: Enhanced Swift-XRT position
  47. GRB 080702B Swift-BAT refined analysis
  48. GRB 080703: Swift detection of a burst with optical afterglow
  49. No radio detection from the short GRB 080702A
  50. Swift/UVOT observation of GRB080702A
  51. GRB 080702B: Swift XRT and UVOT observations
  52. GRB 080625: Suzaku WAM observation of the prompt emission
  53. GRB 080701A: Early RAPTOR optical limits
  54. Swift Trigger 315630: Swift/UVOT Upper Limits
  55. GRB 080702A: Swift-XRT Team refined analysis
  56. GRB 080702B : Burst detected in BAT during Swift slew
  57. GRB 080702A: Enhanced Swift-XRT position
  58. Swift Trigger 315630: TLS R-band observation
  59. Swift Trigger 315630: Probably not a GRB
  60. GRB 080702: Swift detection of a short burst
  61. GRB 080701: Swift-XRT refined analysis
  62. GRB 080701A, VATT optical upper limit
  63. TLS I-Band Observation of GRB 080701A
  64. GRB 080701A: Swift/UVOT Upper Limits
  65. GRB 080701: Enhanced Swift-XRT position
  66. GRB 080701A, Swift-BAT refined analysis
  67. Trigger 315630: Swift detection of a possible burst
  68. GRB 080701: Swift-XRT Prompt Analysis
  69. GRB 080623: Suzaku WAM observation of the prompt emission
  70. GRB 080625: Further observations from OSN
  71. GRB 080625:Swift-XRT detection of the afterglow
  72. GRB 080625: Observations at OSN
  73. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  74. GRB 080623: GROND upper limits
  75. GRB 080623: Swift-XRT refined analysis
  76. GRB 080623: Enhanced Swift-XRT position
  77. GRB 080623: TAROT La Silla observatory optical observations
  78. GRB 080623: Swift XRT prompt analysis
  79. Swift trigger 314975 is not a GRB
  80. GRB080607: optical observation
  81. GRB 070809: Putative host galaxy and redshift
  82. VLA upper limit on INTEGRAL burst GRB 080613A
  83. GRB080613B: MITSuME upper limits
  84. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  85. Konus-Wind observation of GRB 080613B
  86. GRB 080603A: optical observations on June 04
  87. GRB 080613A: Swift-XRT detection of the afterglow
  88. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  89. GRB 080613B: GROND Upper Limits
  90. GRB 080613B - NOT optical and IR nondetections
  91. GRB 080613B: Swift-XRT refined analysis
  92. GRB 080514B: Spectroscopic constraints and probable host galaxy
  93. GRB 080613B: Swift detection of a burst
  94. GRB 080613: Faulkes Telescope North optical candidate
  95. GRB 080603A: Late-time Keck imaging and spectroscopy
  96. GRB 080603b: optical observation
  97. GRB 080603A: final Swift-XRT observations.
  98. GRB 080607: AGILE-MCAL observation of the prompt emission
  99. GRB 080603B - TLS 2nd Epoch: Another Break
  100. GRB 080605: TLS 3rd Epoch - Source Confusion

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