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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"

5401 results found.

  1. GRB 110319B Swift-XRT afterglow confirmation
  2. GRB 110319B: Swift-XRT afterglow candidate.
  3. GRB 110319B found in ground analysis of Swift-BAT data
  4. GRB 110315A: RTT150 optical observations
  5. GRB 110315A: MASTER early optical observations
  6. GRB110312A: MITSuME Okayama Optical upper limits
  7. GRB110305A: MITSuME Ishigakijima Optical upper limits
  8. GRB 110223A: optical upper limits
  9. GRB 110223A: Liverpool Telescope observations
  10. GRB 110223A: Swift detection of a burst
  11. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  12. GRB 110128A: Swift/UVOT observations
  13. GRB 110128A: WHT redshifts of nearby field galaxies
  14. GRB 110128A: Enhanced Swift-XRT position
  15. GRB 110128A: Afterglow detection from NOT
  16. GRB 110128A: Swift detection of a burst
  17. GRB 101224A, the review of the sky area in plate archives
  18. GRB 110120A: Fermi GBM detection
  19. GRB 110106B: MASTER optical observations
  20. Trigger 441015 / GRB 101225A: Further NOT optical observation
  21. GRB 101224A - UVOT-enhanced XRT position
  22. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  23. GRB 101219A: GROND Upper limits
  24. GRB 101219A: Magellan NIR observations
  25. GRB 101023A: miniTAO/ANIR NIR detection
  26. GGRB 101023A: GROND detection of the optical-NIR afterglow
  27. GRB 101008A: optical observations
  28. GRB 100902A: D50 optical limit
  29. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  30. GRB 101008A: Swift-BAT refined analysis
  31. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  32. GRB 101008A: Swift detection of a burst
  33. GRB 100924A: Suzaku WAM observation of the prompt emission
  34. GRB 100924A: Fermi GBM observation
  35. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  36. GRB 100924A: Swift detection of a burst
  37. GRB 100917A: Swift detection of a burst
  38. GRB 100906A: GRAS-007 optical observations
  39. GRB 100906A: Observations at the Virtual Telescope
  40. GRB 100906A : Faulkes Telescope North optical observations
  41. Optical observations of GRB 100901A
  42. GRB 100902A: GROND observations; afterglow candidate
  43. GRB100902A: Optical upper limits at IAO
  44. GRB10901A: Optical observations at IAO
  45. GRB 100901A: Lightbuckets Optical Observations
  46. GRB 100902A: optical observation at Mt.Terskol
  47. GRB 100901A: optical observation at Mt.Terskol
  48. GRB 100829.9: MASTER Optical Limits
  49. GRB 100814A: Suzaku WAM observation of the prompt emission
  50. Konus-Wind observation of GRB 100814A
  51. GRB 100816A: MASTER Optical Limits
  52. GRB100816A: TNG optical afterglow confirmation.
  53. GRB 100814A: Fermi GBM observation
  54. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  55. GRB 100814A: Swift UVOT observations of the optical afterglow
  56. GRB 100814A: Swift detection of a burst with an optical afterglow
  57. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  58. Swift-BAT trigger 431582 likely is IGR J17464-2811
  59. GRB100807A: optical observation in CrAO
  60. GRB 100807A: P60 Optical Afterglow Discovery
  61. GRB 100719A: Swift detection of a burst
  62. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  63. GRB 100628A: Chandra observations
  64. GRB 100628A: Swift XRT/UVOT refined analysis
  65. Konus-Wind observation of GRB 100704A
  66. GRB 100704A: Fermi GBM observation
  67. GRB 100704A: Swift detection of a burst
  68. GRB 100615A: Additional Gemini/NIRI observations
  69. GRB 100701B: Fermi GBM detection
  70. GRB 100702A: Swift detection of a short burst
  71. GRB 100213B: Detection of Fading Optical Afterglow
  72. GRB 100628A: Gemini North Observations
  73. GRB 100628A: Swift XRT refined position
  74. GRB 100628A: Magellan near-IR observations
  75. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  76. GRB 100625A : IRSF/SIRIUS NIR upper limit
  77. GRB 100625A: Gemini candidate afterglow
  78. Konus-Wind observation of GRB 100621A
  79. GRB 100619A: Correction to the Fermi GBM trigger time
  80. GRB 100621A: GROND observation of bright NIR afterglow
  81. GRB 100621A: ROTSE-III Optical Limits
  82. GRB 100621A: Swift detection of a burst
  83. GRB 100619A: Fermi GBM detection
  84. XRF 100616a : MAXI/GSC detection of a probable XRF
  85. GRB 100615A: Swift detection of a burst
  86. GRB 100513A: CrAO optical observations
  87. Konus-Wind observation of GRB 100522A
  88. GRB100522A: Suzaku WAM observation of the prompt emission
  89. GRB 100522A: Fermi GBM observation
  90. GRB 100522A: Swift detection of a burst
  91. GRB 100513A: PAIRITEL NIR afterglow candidate
  92. GRB100503A: Suzaku WAM observation of the prompt emission
  93. GRB 100503A: Fermi GBM detection
  94. GRB 100424A: PAIRITEL NIR Upper Limits
  95. Swift Trigger 420256: BOOTES-2 observations
  96. Swift Trigger 420256: ROTSE-III Optical Limits
  97. GRB100420A: MITSuME optical upper limits
  98. GRB 100414A: GROND Detection of the Optical Afterglow
  99. GRB 100413: xinglong TNT optical upper limit
  100. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source

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