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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"

2915 results found.

  1. GRB 131018A: KAIT Optical Upper Limit
  2. GRB 131018A: Swift detection of a burst
  3. GRB 131011A: Fermi GBM detection
  4. GRB 130925A: Swift-XRT refined Analysis
  5. GRB 130925A: MAXI/GSC detection
  6. GRB 130907A: Maidanak optical observations
  7. GRB 130907A: MASTER refined analysis
  8. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  9. GRB 130912A: REM optical/NIR upper limits
  10. GRB 130831A: Maidanak optical observations
  11. GRB 130831A: ISON-Kislovodsk optical observations
  12. GRB 130831A: optical observation in Gissar AO
  13. GRB 130903A: Fermi GBM observation
  14. GRB 130903A: A long GRB detected by INTEGRAL
  15. Konus-Wind observation of GRB 130821A
  16. GRB 130822A: Swift/UVOT Upper Limits
  17. GRB 130816A: REM NIR candidate afterglow
  18. Refined IPN Triangulation of GRB 130812B
  19. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  20. GRB 130719A: Swift detection of a burst
  21. Fermi GBM trigger 394325281 / 130630950 is not a GRB
  22. GRB 130627B: Swift detection of a burst
  23. Swift Trigger 558828 is not an interesting event
  24. GRB 130615A: Swift detection of a burst
  25. Swift Trigger 557674 was due to an onboard position error
  26. GRB 130606A, Swift-BAT refined analysis
  27. GRB 130606A: EVLA detection
  28. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  29. GRB 130606A: Enhanced Swift-XRT position
  30. GRB 130606A: AAO optical observations
  31. GRB130606A: Montarrenti Observatory afterglow detection
  32. Virtual Telescope observations of GRB 130606A
  33. GRB 130606A: IRSF NIR Observation
  34. GRB 130606A: NOT afterglow detection
  35. GRB 130606A: Swift detection of a burst
  36. GRB 130605A: GROND afterglow candidate
  37. Swift Trigger 557466 is probably not real.
  38. GRB 130603A: Swift-XRT and Swift-UVOT detections
  39. GRB 130511A: Swift detection of a burst with an optical counterpart
  40. GRB 130504C: Fermi GBM detection
  41. GRB 130502A: Swift-BAT refined analysis
  42. GRB 130502B: Fermi GBM detection of a burst
  43. GRB 130427A: high energy gamma-ray detection by AGILE
  44. GRB 130427B: MITSuME Ishigakijima upper limits
  45. GRB 130427A optical time series
  46. Konus-Wind observation of GRB 130427A
  47. GRB 130427A: SPI-ACS/INTEGRAL observations
  48. GRB 130427B: MITSuME Okayama upper limits
  49. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  50. GRB 130427A: Fermi GBM observation
  51. GRB 130427A: Fermi-LAT detection of a burst
  52. GRB 130427A: Swift-BAT refined analysis
  53. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  54. GRB 130420B: CARMA and VLA radio observations
  55. GRB 130418A: Swift detection of a burst with an optical counterpart
  56. GRB 130211A: Retraction of afterglow candidate
  57. Konus-Wind observation of GRB 130320B
  58. GRB 130327B: Fermi GBM detection
  59. GRB 130327A: Swift detection of a burst
  60. GRB 130315A: GROND afterglow candidate
  61. GRB 130305A: optical upper limit in Mondy observatory
  62. GRB 130313A: optical upper limit in Mondy observatory
  63. GRB 130315A: Swift-XRT refined Analysis
  64. GRB 130315A, Swift-BAT refined analysis
  65. GRB 130315A: Swift detection of a burst
  66. Konus-Wind observation of GRB 130306A
  67. GRB 130306A: Fermi GBM observation
  68. GRB 130305A: P60 Observations
  69. GRB 121128A: optical observations in Mondy observatory
  70. GRB 121128A: optical upper limit in Maidanak observatory
  71. GRB 130206A: GROND Observations
  72. GRB 130131A: Swift-BAT refined analysis
  73. GRB 130122A: optical observations
  74. GRB 121229A: MAXI/GSC detection
  75. GRB 121217A: Swift detection of a burst
  76. GRB 121211A: Fermi GBM observation
  77. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  78. GRB 121211A: Swift detection of a burst with an optical counterpart
  79. GRB 121209A: GROND optical afterglow candidate
  80. IPN Triangulation of GRB 121118B (long/intense)
  81. GRB 121117A: MASTER prompt optical limit
  82. GRB 121108A: Swift-XRT refined Analysis
  83. GRB 121108A: Xinglong TNT upper limit
  84. GRB 121108A: Swift detection of a burst
  85. GRB 121031A: Fermi GBM detection
  86. GRB 121024A: MITSuME Ishigakijima upper limits
  87. IPN Triangulation of short hard GRB 121011B
  88. GRB 120913B: REM NIR early time detection
  89. GRB 120908A: MAXI/GSC detection
  90. GRB 120830A: early MASTER optical limit
  91. IPN Triangulation of short GRB 120830A
  92. Fermi trigger 368003226 : MASTER optical observations
  93. GRB 120821A: GROND upper limits
  94. Swift Trigger 530581: GRB 120811A or a galactic transient
  95. GRB120805A: Liverpool Telescope observations
  96. GRB 120804A: Gemini-North observations
  97. GRB 120802A: Swift detection of a burst
  98. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  99. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  100. Swift trigger 524642 / SwJ1910.2-0546

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