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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"

45435 results found.

  1. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  2. GRB 120716A: Typo correction in GCN 13490
  3. GRB 120716A: Optical decay from NOT
  4. GRB 120716A: Candidate Optical Afterglow from PTF
  5. Konus-Wind observation of GRB 120716A
  6. IPN Triangulation of unusual GRB 120716A
  7. Fermi GBM trigger 120716.498 is not a GRB
  8. GRB 120711A: ATCA 34GHz final observations (upper limit)
  9. GRB 120714B: Swift/UVOT Detection
  10. GRB 120714B: Swift-XRT refined Analysis
  11. GRB120714A: Swift/UVOT upper limits
  12. GRB 120714B: Swift-BAT refined analysis
  13. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  14. GRB 120714A: GROND upper limits
  15. GRB 120714B: GROND confirmation of fading afterglow
  16. GRB 120714B: Redshift from VLT/X-shooter
  17. GRB 120714A: Swift-XRT refined Analysis
  18. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  19. GRB 120624B: VLA Observations
  20. GRB 120714B: Position Correction and Candidate Optical Afterglow
  21. GRB 120714A: Swift-BAT refined analysis
  22. GRB 120714B: Swift detection of a burst
  23. GRB 120714A: Enhanced Swift-XRT position
  24. GRB 120712A: Fermi GBM observation
  25. GRB 120711A: INTEGRAL/SPI observations
  26. GRB120714A: UVOT non-detection
  27. GRB 120714A: Swift-XRT observations
  28. GRB120711B: MITSuME Ishigakijima upper limits
  29. GRB 120714A: Swift detection of a burst
  30. GRB 120711A: ATCA 34GHz further observations (upper limit)
  31. IPN Triangulation of GRB 120709A
  32. GRB 120712A: Swift/UVOT Detection
  33. GRB 120712A: VLT/Xshooter redshift
  34. GRB 120712A: Swift-XRT refined Analysis
  35. GRB 120712A Gemini-S redshift
  36. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  37. GRB 120712A: Enhanced Swift-XRT position
  38. GRB 120712A: Swift-BAT refined analysis
  39. GRB 120712A: Swift detection of a burst with optical afterglow
  40. GRB 120711B: Swift-XRT refined Analysis
  41. GRB 120711A: Fermi LAT Detection
  42. GRB 120711A: ATCA 34GHz upper limit
  43. GRB 120711B: Swift-BAT refined analysis
  44. GRB 120711B: Swift/UVOT Upper Limits
  45. GRB 120711A: Swift/UVOT Observations
  46. GRB 120709A: Swift/UVOT Observations
  47. Konus-Wind observation of GRB 120711A
  48. GRB 120711A: Fermi LAT detection
  49. GRB 120711A: MASTER early OT detection
  50. GRB 120711A: Swift-XRT observations
  51. GRB 120711A Gemini-S likely redshift
  52. Konus-Wind observation of GRB 120709A
  53. GRB 120711A: REM NIR early time detection
  54. GRB 120711A: GROND photometric redshift
  55. GRB 120711A: Fermi GBM observation
  56. GRB 120711A: MAXI/GSC detection
  57. GRB 120711A: a possible X-ray transient
  58. GRB 120711A: an bright long GRB detected with INTEGRAL
  59. Continued Skynet/PROMPT observations of GRB120711A
  60. GRB 120711A: ROTSE-III confirm of Optical Counterpart
  61. Swift detection of GRB 120711B or a new Galactic transient
  62. Skynet/PROMPT Observations of GRB120711A
  63. GRB 120709A: Fermi GBM detection
  64. GRB 120709A: Swift-XRT observations
  65. GRB 120709A: Matched filter analysis of Fermi-LAT data
  66. GRB 120709A: optical afterglow limits
  67. Konus-Wind observation of GRB 120707A
  68. IPN Triangulation of GRB 120707A
  69. GRB 120709A: Fermi-LAT Detection
  70. GRB 120707A: Fermi GBM Detection of a Bright Burst
  71. GRB 120624B: mm detection at PdBI
  72. GRB 120703A: SMARTS optical/IR observations
  73. GBM triggers 120705.153 & 120705.322 were not GRBs
  74. GRB 120703A: Swift/UVOT Detection
  75. GRB 120703A: Fermi GBM detection
  76. GRB 120703A: Swift-XRT refined Analysis
  77. GRB 120703A: Enhanced Swift-XRT position
  78. GRB 120703A: Swift-BAT refined analysis
  79. GRB 120624B Suzaku WAM observation of the prompt emission
  80. Konus-Wind observation of GRB 120703A
  81. GRB 120703A: NOT optical observation
  82. GRB 120701A: Swift/UVOT Detection
  83. GRB 120701A: GROND detection of the afterglow
  84. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  85. Swift Trigger 525554 is noise
  86. GRB 120701A: Swift-XRT afterglow detection and analysis
  87. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  88. GRB 120701A: Swift-BAT refined analysis
  89. GRB 120630A: NOT optical source within the XRT error circle
  90. Swift Trigger 525554 is probably not a GRB
  91. GRB120624B: Chandra observations and afterglow detection
  92. Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
  93. GRB 120624B Further Swift-XRT analysis
  94. GRB 120624B: Swift/UVOT Upper Limits
  95. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  96. GRB 120624B: Further analysis of the HAWKI observations
  97. GRB 120624B: Swift-XRT observations
  98. GRB 120624B: GROND upper limits
  99. XRF 120626B: MAXI/GSC detection
  100. GRB 120624B: NIR counterpart candidate from HAWKI

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