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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"

11509 results found.

  1. GRB 131029A: Fermi GBM observation
  2. GRB 131029A Tiled Swift observations
  3. GRB 131029A: Fermi-LAT detection of a burst
  4. Konus-Wind observation of GRB 131028A
  5. IPN Triangulation of GRB 131028A (long/bright)
  6. GRB 131028A: Fermi GBM detection
  7. GRB 131024B: Fermi GBM observation
  8. Fermi GBM trigger 13121024.436 is not a GRB
  9. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  10. IPN Triangulation of GRB 131014A
  11. GRB 131018B: Swift-XRT observations
  12. GRB 131018B: Fermi GBM observation
  13. GRB 131018B: Fermi-LAT detection of a burst
  14. GRB 131014A: Suzaku WAM observation of the prompt emission
  15. GRB 131014A: GROND observations
  16. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  17. Fermi GBM data availability during U.S. government shutdown
  18. GRB 131014A: Swift-XRT refined Analysis
  19. GRB 131011A: Swift/UVOT Upper Limits
  20. GRB 131014A: Swift/UVOT Upper Limits
  21. Fermi 403206457 / GRB 131011A: AAO optical observations
  22. GRB 131014A: RATIR Optical and NIR Observations
  23. Konus-Wind observation of GRB 131014A
  24. GRB 131014A: NOT afterglow candidate
  25. GRB 131014A: Nanshan optical observations
  26. GRB 131014A: Swift detection of a possible X-ray afterglow
  27. GRB 131014A Tiled Swift observations
  28. GRB 131014A: Fermi-LAT detection
  29. GRB 131014A: Fermi GBM detection
  30. GRB 131011A: Fermi GBM detection
  31. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  32. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  33. Fermi403206457: continued P60 observations and fading behavior
  34. Fermi403206457: Weihai optical upper limit
  35. Fermi403206457: NOT optical observations
  36. Fermi403206457: iPTF detection of a possible optical afterglow
  37. GRB 131004A: Fermi GBM observation
  38. GRB 131002A: Fermi GBM observation
  39. Fermi Gamma-ray Burst Monitor trigger 402405063 / 131002466 is not a GRB
  40. IPN Observations of GRB 130925A
  41. Fermi LAT Upper Limits on GRB 130925A
  42. GRB 130925A: Fermi GBM Detection
  43. Konus-Wind observation of GRB 130925A
  44. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  45. GRB 130925A Swift-BAT refined analysis
  46. Fermi GBM detection of GRB 130925A and a possible precursor
  47. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  48. GRB 130702A: RTT150 optical observations
  49. Fermi Trigger 401326696: MASTER prompt optical observations
  50. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  51. Konus-Wind observation of GRB 130912A
  52. GRB 130912A: Fermi GBM detection
  53. GRB 130828A: Further Swift XRT observations
  54. GRB 130907A: INTEGRAL/SPI-ACS light curve
  55. Errata of GRB name in GCN 15196: should have been GRB 130907A instead of GRB 120916A
  56. GRB 120916A: Fermi-LAT detection of a burst
  57. GRB 130903A: Fermi GBM observation
  58. IPN triangulation of GRB 130828A - error box
  59. GRB 130828A: Swift XRT and UVOT observations
  60. IPN triangulation of GRB 130828A
  61. GRB 130828A Tiled Swift observations
  62. GRB 130828A: Fermi GBM detection
  63. GRB 130828A: Fermi-LAT detection of a burst
  64. IPN triangulation of GRB130821A
  65. Konus-Wind observation of GRB 130821A
  66. GRB 130821A: Swift-XRT observation
  67. GRB 130821A: Fermi-LAT detection of a burst
  68. GRB 130821A: Fermi GBM Detection
  69. Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
  70. GRB 130816A: Fermi GBM observation
  71. Konus-Wind observation of GRB 130804A
  72. IPN localization of GRB 130804A
  73. GRB 130804A; Fermi GBM observation
  74. GRB 130803A; Fermi GBM observation
  75. GRB 130727A: Fermi GBM detection
  76. Fermi Gamma-ray Burst Monitor trigger 396484884 / 130725945 is not a GRB
  77. Fermi Gamma-ray Burst Monitor trigger 396533554 / 130726509 is not a GRB
  78. Fermi Gamma-ray Burst Monitor trigger 396447899 / 130725517 is not a GRB
  79. GRB 130702A in the Ep,i - Eiso plane
  80. GRB 130716A: Fermi GBM observation
  81. GRB 130702A : Xinglong TNT continue optical observation
  82. GRB 130715A: Fermi GBM detection
  83. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  84. GRB 130708A: Fermi GBM observation
  85. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  86. GRB 130708A found in ground analysis of Swift-BAT data
  87. GRB 130702A: Xinglong TNT optical observation
  88. GRB 130702A: VLA detection
  89. GRB 130702A (= Fermi 394416326): correction of the GCN #14988 title
  90. GRB 130702Ð
  91. Konus-Wind observation of GRB 130702A
  92. GRB 130702A: further TNG observations
  93. GRB 130702A: further Swift-XRT observations
  94. GRB 130702A: Continued P60 observations
  95. GRB 130702A: CARMA 3mm detection
  96. GRB 130702A: TNG optical observations
  97. GRB 130702A / Fermi394416326 : Nanshan optical observations
  98. IPN localization of GRB 130702A (= Fermi 394416326)
  99. Fermi GRB 130702A: Swift XRT and UVOT observations
  100. GRB 130702A / Fermi394416326: Fermi GBM detection

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