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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"

12089 results found.

  1. GRB 090926: Fermi GBM detection
  2. GRB 090925: Fermi GBM detection
  3. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  4. GRB 090912: Swift detection of a burst
  5. GRB 090904B: Swift-BAT refined analysis
  6. GRB 090904A: ROTSE-III Optical Limits
  7. GRB090902B: Swift XRT refined analysis
  8. GRB 090902B: Fermi LAT and GBM refined analysis.
  9. GRB 090902B: Fermi LAT detection
  10. Konus-Wind observations of GRB 090831A
  11. Konus-Wind observations of GRB 090827
  12. GRB 090827: Swift XRT and UVOT observations
  13. Konus-Wind observations of GRB 090823
  14. GRB 090823 Long burst with IPN triangulation and BAT position
  15. GRB 090820B: Fermi GBM detection
  16. GRB 090820: Fermi GBM Detection of a bright burst.
  17. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  18. GRB 090814A: Swift-XRT Team Refined Analysis
  19. GRB 090813: correction to GCN 9787
  20. GRB 090814: Swift detection of a burst
  21. GRB 090813: Swift-XRT refined analysis
  22. Konus-Wind observations of GRB090813
  23. GRB 090813: Liverpool Telescope afterglow confirmation
  24. GRB 090813: P60 Optical Afterglow Confirmation
  25. GRB 090812: Swift detection of a burst with an optical counterpart
  26. GRB 090809: Swift detection of a burst with a possible optical counterpart
  27. GRB 090807: Swift-XRT refined analysis
  28. GRB 090807: Swift detection of a burst
  29. IPN Triangulation and Konus-Wind observaions of GRB090727B
  30. GRB 090726: optical observation
  31. GRB 090709A : Quick look analysis of the Suzaku observation
  32. GRB 090728: Swift detection of a burst
  33. GRB 090727: Swift-BAT refined analysis
  34. GRB 090711: Fermi GBM detection
  35. GRB 090726: Swift-XRT Team refined analysis
  36. GRB 090726: Swift detection of a burst
  37. Konus-Wind and Konus-RF observations of GRB 090719
  38. Konus-RF and Konus-Wind observations of GRB 090718B
  39. Konus-Wind observations of bright hard GRB 090720B
  40. GRB 090720: Gemini-North Imaging and Optical Afterglow
  41. GRB 090720B: Fermi GBM detection
  42. Swift XRT and UVOT refned analysis of GRB 090720
  43. GRB 090720 Source found in ground processing of Swift-BAT data
  44. GRB 090720: Fermi GBM detection
  45. Konus-Wind observations of short/hard GRB 090715A
  46. GRB 090715A: Swift-BAT refined analysis
  47. Konus-Wind and Konus-RF observations of GRB 090715B
  48. GRB 090715B: Swift XRT Refined Analysis
  49. GRB 090715A: ROTSE-III Optical Limits
  50. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  51. GRB090713 optical limit by "Pi of the Sky"
  52. GRB 090621B: MTM-500 optical observations
  53. GRB 090709A: deep optical observation with the 10.4m GTC
  54. GRB 090709A: WHT LIRIS observations
  55. Konus-Wind and Konus-RF observations of GRB 090709A
  56. GRB 090709A: Swift XRT Refined Analysis
  57. GRB 090709A: Swift-BAT refined analysis
  58. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  59. GRB 090709: ROTSE-III Optical Limits
  60. GRB 090709: Swift detection of a bright burst
  61. GRB 090708: ROTSE-III Optical Limits
  62. GRB 090708: Swift detection of a burst
  63. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  64. GRB 090706: Fermi GBM detection
  65. XRF 090702: a long soft GRB localized with INTEGRAL
  66. Konus-Wind observation of GRB 090626
  67. GRB 090628: Swift detection of a burst
  68. Fermi LAT observations of GRB 090626
  69. GRB 090618: SARA Second Epoch Observations
  70. GRB 090625B: a long GRB localized by INTEGRAL
  71. GRB 090623: Fermi GBM detection
  72. GRB 090621B: P60 Observations
  73. GRB 090620: Fermi GBM detecion
  74. Konus-Wind and Konus-RF observations of GRB 090618
  75. GRB 090621B: Swift-XRT refined analysis
  76. GRB 090621B: RTT150 optical observations
  77. GRB 090621B: Optical Observations
  78. GRB 090621A: Swift-BAT refined analysis
  79. GRB 090618 15GHz radio detection
  80. GRB090618: Swift-XRT team refined analysis
  81. GRB 090618: Lick/KAST Spectroscopy
  82. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  83. RXTE Discovery of Pulsations from SGR 0418+5729
  84. Konus-RF observation of SGR burst 090605A
  85. Discovery of a new soft gamma repeater source, SGR 0418+5729
  86. GRB 090607: XRT Team Refined Analysis
  87. GRB 090607: Swift detection of a burst
  88. GRB 090528B: Suzaku WAM observation of the prompt emission
  89. GRB 090531B: ROTSE-III Optical Limits
  90. GRB 090530: break in light curve
  91. GRB090530: Swift XRT refined analysis
  92. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  93. GRB 090530: Swift detection of a burst with an optical counterpart
  94. GRB 090529: optical observations
  95. GRB 090529: Xinglong TNT optical observation
  96. GRB 090529: Swift detection of a burst
  97. GRB 090520D: Fermi GBM detection
  98. GRB 090520C: Fermi GBM detection
  99. GRB 090520B: Fermi GBM detection
  100. GRB 090522 : Fermi GBM detection

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