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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"

26301 results found.

  1. Konus-Wind observation of GRB 100829A
  2. GRB 100904A: Swift detection of a burst
  3. GRB 100902A: Swift-BAT refined analysis
  4. Tentative redshift of GRB100902A from Swift-XRT data
  5. GRB 100902A: Swift XRT refined analysis
  6. GRB 100902A: Enhanced Swift-XRT position
  7. GRB 100901A: TLS Observations: Break?
  8. GRB 100902A: Swift detection of a burst
  9. GRB 100901A: THO optical observations
  10. GRB 100901A: Swift-XRT Team refined analysis
  11. GRB 100901A - NOT optical observation
  12. GRB 100901A: Swift-BAT refined analysis
  13. GRB 100901A: Enhanced Swift-XRT position
  14. GRB 100901A: Swift detection of a burst with an optical afterglow
  15. Konus-Wind observation of GRB 100826A
  16. IPN triangulation of GRB 100826A
  17. GRB100826A: Fermi-LAT Observations
  18. GRB 100823A: MAXI/GSC detection
  19. GRB100807A: R band observations
  20. GRB100823A : MOA optical observation
  21. GRB 100823A: VLT/X-Shooter spectroscopy
  22. GRB 100823A: TNG NIR observations
  23. GRB 100823: 1.5m OSN I-band observations
  24. GRB 100823A: Swift-BAT refined analysis
  25. GRB 100823A: Enhanced Swift-XRT position
  26. GRB 100823A: Swift detection of a burst
  27. GRB 100814A: Suzaku WAM observation of the prompt emission
  28. EVLA radio afterglow detection of GRB 100814A
  29. GRB 100814B: Fermi GBM detection
  30. GRB 100816A: Fermi GBM observation (correction to GCN 11124)
  31. Konus-Wind observation of GRB 100816A
  32. GRB 100816A: Fermi GBM observation
  33. GRB 100816A: VLT and Gemini-N revised redshift
  34. GRB 100814A : Liverpool Telescope Observations
  35. Konus-Wind observation of GRB 100814A
  36. GRB 100814A : Lulin optical observation
  37. GRB 100816A : Lulin r'-band observation
  38. GRB 100816A: Swift UVOT Observations
  39. GRB100816A Swift-XRT refined analysis
  40. GRB 100816A, Swift-BAT refined analysis
  41. GRB 100816A: Enhanced Swift-XRT position
  42. GRB 100816A: Gemini-N imaging
  43. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  44. GRB100814A - interesting UVOT lightcurve.
  45. GRB 100816A: TAROT Calern observatory optical detection
  46. GRB100816A: TNG optical afterglow confirmation.
  47. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  48. GRB 100814A: Fermi GBM observation
  49. GRB 100814A: Swift-XRT refined analysis
  50. GRB 100814A, Swift-BAT refined analysis
  51. GRB 100814A: CQUEAN r- and i-band Observation
  52. GRB 100814A: Enhanced Swift-XRT position
  53. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  54. GRB 100814A: IAC80 R-band observations
  55. GRB100814A: Magellan Echellette Observations
  56. GRB 100814A: Swift detection of a burst with an optical afterglow
  57. Swift-BAT trigger 431582 likely is IGR J17464-2811
  58. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  59. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  60. GRB 100802A: further NOT observation
  61. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  62. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  63. GRB 100807A: Swift XRT refined analysis
  64. GRB 100807A: Enhanced Swift-XRT position
  65. GRB 100807A: Swift-BAT refined analysis
  66. GRB 100807A: Swift detection of a burst
  67. GRB 100805A: ROTSE-III Optical detection
  68. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  69. GRB 100805A: Swift-BAT refined analysis
  70. GRB 100805A: Swift-XRT Refined Analysis
  71. Trigger 430975: Swift detection of a possible burst
  72. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  73. GRB 100805A: Enhanced Swift-XRT position
  74. GRB 100805A: Liverpool Telescope afterglow observations
  75. GRB 100805A: Further P60 Monitoring
  76. GRB 100805A: Enhanced Swift-XRT position
  77. GRB 100805A: Swift detection of a burst with an optical counterpart
  78. GRB 100802A: Fermi GBM observation
  79. GRB 100802A: XRT refined analysis
  80. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  81. GRB 100728A: Suzaku WAM observation of the prompt emission
  82. GRB 100802A: Enhanced Swift-XRT position
  83. GRB 100802A: Swift-BAT refined analysis
  84. GRB 100802A: Liverpool Telescope observations
  85. GRB 100802A: Swift detection of a burst
  86. GRB 100725B: TELMA optical observation
  87. GRB 100728B - NOT optical observation
  88. GRB 100728B: Swift/UVOT Observations
  89. GRB 100728B: Continued KAIT observations
  90. GRB 100728B, Swift-BAT refined analysis
  91. GRB 100728B: Swift-XRT Refined Analysis
  92. Konus-Wind observation of GRB 100728A
  93. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  94. GRB 100728A, Swift-BAT refined analysis
  95. GRB 100728B: Enhanced Swift-XRT position
  96. GRB 100728B: Fermi GBM observation
  97. GRB 100728A: Swift-XRT refined analysis
  98. GRB 100728B: GROND Detection of the NIR Afterglow
  99. GRB 100728B: Swift detection of a burst with an optical counterpart
  100. GRB 100728A: Skynet/PROMPT Detections

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