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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"

11384 results found.

  1. GRB 090904A: ROTSE-III Optical Limits
  2. GRB090902B: Swift XRT refined analysis
  3. GRB 090902B: Fermi LAT and GBM refined analysis.
  4. GRB 090902B: Fermi LAT detection
  5. Konus-Wind observations of GRB 090831A
  6. Konus-Wind observations of GRB 090827
  7. GRB 090827: Swift XRT and UVOT observations
  8. Konus-Wind observations of GRB 090823
  9. GRB 090823 Long burst with IPN triangulation and BAT position
  10. GRB 090820B: Fermi GBM detection
  11. GRB 090820: Fermi GBM Detection of a bright burst.
  12. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  13. GRB 090814A: Swift-XRT Team Refined Analysis
  14. GRB 090813: correction to GCN 9787
  15. GRB 090814: Swift detection of a burst
  16. GRB 090813: Swift-XRT refined analysis
  17. Konus-Wind observations of GRB090813
  18. GRB 090813: Liverpool Telescope afterglow confirmation
  19. GRB 090813: P60 Optical Afterglow Confirmation
  20. GRB 090812: Swift detection of a burst with an optical counterpart
  21. GRB 090809: Swift detection of a burst with a possible optical counterpart
  22. GRB 090807: Swift-XRT refined analysis
  23. GRB 090807: Swift detection of a burst
  24. IPN Triangulation and Konus-Wind observaions of GRB090727B
  25. GRB 090726: optical observation
  26. GRB 090709A : Quick look analysis of the Suzaku observation
  27. GRB 090728: Swift detection of a burst
  28. GRB 090727: Swift-BAT refined analysis
  29. GRB 090711: Fermi GBM detection
  30. GRB 090726: Swift-XRT Team refined analysis
  31. GRB 090726: Swift detection of a burst
  32. Konus-Wind and Konus-RF observations of GRB 090719
  33. Konus-RF and Konus-Wind observations of GRB 090718B
  34. Konus-Wind observations of bright hard GRB 090720B
  35. GRB 090720: Gemini-North Imaging and Optical Afterglow
  36. GRB 090720B: Fermi GBM detection
  37. Swift XRT and UVOT refned analysis of GRB 090720
  38. GRB 090720 Source found in ground processing of Swift-BAT data
  39. GRB 090720: Fermi GBM detection
  40. Konus-Wind observations of short/hard GRB 090715A
  41. GRB 090715A: Swift-BAT refined analysis
  42. Konus-Wind and Konus-RF observations of GRB 090715B
  43. GRB 090715B: Swift XRT Refined Analysis
  44. GRB 090715A: ROTSE-III Optical Limits
  45. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  46. GRB090713 optical limit by "Pi of the Sky"
  47. GRB 090621B: MTM-500 optical observations
  48. GRB 090709A: deep optical observation with the 10.4m GTC
  49. GRB 090709A: WHT LIRIS observations
  50. Konus-Wind and Konus-RF observations of GRB 090709A
  51. GRB 090709A: Swift XRT Refined Analysis
  52. GRB 090709A: Swift-BAT refined analysis
  53. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  54. GRB 090709: ROTSE-III Optical Limits
  55. GRB 090709: Swift detection of a bright burst
  56. GRB 090708: ROTSE-III Optical Limits
  57. GRB 090708: Swift detection of a burst
  58. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  59. GRB 090706: Fermi GBM detection
  60. XRF 090702: a long soft GRB localized with INTEGRAL
  61. Konus-Wind observation of GRB 090626
  62. GRB 090628: Swift detection of a burst
  63. Fermi LAT observations of GRB 090626
  64. GRB 090618: SARA Second Epoch Observations
  65. GRB 090625B: a long GRB localized by INTEGRAL
  66. GRB 090623: Fermi GBM detection
  67. GRB 090621B: P60 Observations
  68. GRB 090620: Fermi GBM detecion
  69. Konus-Wind and Konus-RF observations of GRB 090618
  70. GRB 090621B: Swift-XRT refined analysis
  71. GRB 090621B: RTT150 optical observations
  72. GRB 090621B: Optical Observations
  73. GRB 090621A: Swift-BAT refined analysis
  74. GRB 090618 15GHz radio detection
  75. GRB090618: Swift-XRT team refined analysis
  76. GRB 090618: Lick/KAST Spectroscopy
  77. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  78. RXTE Discovery of Pulsations from SGR 0418+5729
  79. Konus-RF observation of SGR burst 090605A
  80. Discovery of a new soft gamma repeater source, SGR 0418+5729
  81. GRB 090607: XRT Team Refined Analysis
  82. GRB 090607: Swift detection of a burst
  83. GRB 090528B: Suzaku WAM observation of the prompt emission
  84. GRB 090531B: ROTSE-III Optical Limits
  85. GRB 090530: break in light curve
  86. GRB090530: Swift XRT refined analysis
  87. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  88. GRB 090530: Swift detection of a burst with an optical counterpart
  89. GRB 090529: optical observations
  90. GRB 090529: Xinglong TNT optical observation
  91. GRB 090529: Swift detection of a burst
  92. GRB 090520D: Fermi GBM detection
  93. GRB 090520C: Fermi GBM detection
  94. GRB 090520B: Fermi GBM detection
  95. GRB 090522 : Fermi GBM detection
  96. GRB 090518 - NOT upper limit
  97. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  98. GRB 090516C: Fermi GBM detection
  99. GRB 090520 Swift-BAT detection of a burst in ground analysis
  100. GRB 090516: Fermi GBM observation

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