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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"

11519 results found.

  1. GRB 131108A: Fermi-LAT onboard detection of a burst
  2. GRB 131029A: Suzaku WAM observation of the prompt emission
  3. GRB 131105A: Fermi GBM observation
  4. GRB 131018B: RATIR Optical/NIR Observations
  5. GRB 131031A: Fermi GBM detection
  6. GRB 131018B: Further Swift-XRT observations.
  7. GRB 131031A: MASTER optical observation
  8. GRB 131031A found in ground analysis of BAT data
  9. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  10. GRB 131029A: Nanshan optical observations
  11. GRB 131029A: Fermi GBM observation
  12. GRB 131029A Tiled Swift observations
  13. GRB 131029A: Fermi-LAT detection of a burst
  14. Konus-Wind observation of GRB 131028A
  15. IPN Triangulation of GRB 131028A (long/bright)
  16. GRB 131028A: Fermi GBM detection
  17. GRB 131024B: Fermi GBM observation
  18. Fermi GBM trigger 13121024.436 is not a GRB
  19. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  20. IPN Triangulation of GRB 131014A
  21. GRB 131018B: Swift-XRT observations
  22. GRB 131018B: Fermi GBM observation
  23. GRB 131018B: Fermi-LAT detection of a burst
  24. GRB 131014A: Suzaku WAM observation of the prompt emission
  25. GRB 131014A: GROND observations
  26. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  27. Fermi GBM data availability during U.S. government shutdown
  28. GRB 131014A: Swift-XRT refined Analysis
  29. GRB 131011A: Swift/UVOT Upper Limits
  30. GRB 131014A: Swift/UVOT Upper Limits
  31. Fermi 403206457 / GRB 131011A: AAO optical observations
  32. GRB 131014A: RATIR Optical and NIR Observations
  33. Konus-Wind observation of GRB 131014A
  34. GRB 131014A: NOT afterglow candidate
  35. GRB 131014A: Nanshan optical observations
  36. GRB 131014A: Swift detection of a possible X-ray afterglow
  37. GRB 131014A Tiled Swift observations
  38. GRB 131014A: Fermi-LAT detection
  39. GRB 131014A: Fermi GBM detection
  40. GRB 131011A: Fermi GBM detection
  41. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  42. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  43. Fermi403206457: continued P60 observations and fading behavior
  44. Fermi403206457: Weihai optical upper limit
  45. Fermi403206457: NOT optical observations
  46. Fermi403206457: iPTF detection of a possible optical afterglow
  47. GRB 131004A: Fermi GBM observation
  48. GRB 131002A: Fermi GBM observation
  49. Fermi Gamma-ray Burst Monitor trigger 402405063 / 131002466 is not a GRB
  50. IPN Observations of GRB 130925A
  51. Fermi LAT Upper Limits on GRB 130925A
  52. GRB 130925A: Fermi GBM Detection
  53. Konus-Wind observation of GRB 130925A
  54. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  55. GRB 130925A Swift-BAT refined analysis
  56. Fermi GBM detection of GRB 130925A and a possible precursor
  57. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  58. GRB 130702A: RTT150 optical observations
  59. Fermi Trigger 401326696: MASTER prompt optical observations
  60. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  61. Konus-Wind observation of GRB 130912A
  62. GRB 130912A: Fermi GBM detection
  63. GRB 130828A: Further Swift XRT observations
  64. GRB 130907A: INTEGRAL/SPI-ACS light curve
  65. Errata of GRB name in GCN 15196: should have been GRB 130907A instead of GRB 120916A
  66. GRB 120916A: Fermi-LAT detection of a burst
  67. GRB 130903A: Fermi GBM observation
  68. IPN triangulation of GRB 130828A - error box
  69. GRB 130828A: Swift XRT and UVOT observations
  70. IPN triangulation of GRB 130828A
  71. GRB 130828A Tiled Swift observations
  72. GRB 130828A: Fermi GBM detection
  73. GRB 130828A: Fermi-LAT detection of a burst
  74. IPN triangulation of GRB130821A
  75. Konus-Wind observation of GRB 130821A
  76. GRB 130821A: Swift-XRT observation
  77. GRB 130821A: Fermi-LAT detection of a burst
  78. GRB 130821A: Fermi GBM Detection
  79. Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
  80. GRB 130816A: Fermi GBM observation
  81. Konus-Wind observation of GRB 130804A
  82. IPN localization of GRB 130804A
  83. GRB 130804A; Fermi GBM observation
  84. GRB 130803A; Fermi GBM observation
  85. GRB 130727A: Fermi GBM detection
  86. Fermi Gamma-ray Burst Monitor trigger 396484884 / 130725945 is not a GRB
  87. Fermi Gamma-ray Burst Monitor trigger 396533554 / 130726509 is not a GRB
  88. Fermi Gamma-ray Burst Monitor trigger 396447899 / 130725517 is not a GRB
  89. GRB 130702A in the Ep,i - Eiso plane
  90. GRB 130716A: Fermi GBM observation
  91. GRB 130702A : Xinglong TNT continue optical observation
  92. GRB 130715A: Fermi GBM detection
  93. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  94. GRB 130708A: Fermi GBM observation
  95. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  96. GRB 130708A found in ground analysis of Swift-BAT data
  97. GRB 130702A: Xinglong TNT optical observation
  98. GRB 130702A: VLA detection
  99. GRB 130702A (= Fermi 394416326): correction of the GCN #14988 title
  100. GRB 130702Ð

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