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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"

27292 results found.

  1. SGR 0501+4516: Swift XRT measure of the spin period
  2. GRB080823: Fermi Gamma-ray Burst Monitor detection
  3. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  4. GRB080825C: GLAST Burst Monitor detection
  5. GRB 080825B: Swift-XRT team analysis
  6. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  7. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  8. Konus-Wind observations of new SGR 0501+4516
  9. Radio Detection of SGR 0501+4516
  10. SGR 0501+4516: MDM Optical Observations
  11. GRB 080822B, Swift-BAT refined analysis
  12. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  13. SGR 0501+4516: WSRT Radio Observations
  14. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  15. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  16. SGR 0501+4516: optical observations
  17. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  18. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  19. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  20. GRB 080822B: Swift detection of a burst
  21. GRB080818B: GLAST Burst Monitor detection
  22. Third event from SGR 0501+4516
  23. New Soft Gamma Repeater 0501+4516 was GRB 080822
  24. GRB 080822: Swift detection of a short burst
  25. GLAST Burst Monitor detection of a GRB: 080816B
  26. GLAST Burst Monitor detection of GRB 080818
  27. GLAST Burst Monitor detection of GRB080817B
  28. GLAST Burst Monitor detection of GRB 080817
  29. GLAST Burst Monitor detection of GRB080816
  30. GLAST Burst Monitor detection of GRB 080812
  31. Radio detection of GRB 080810 with the VLA
  32. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  33. GLAST Burst Monitor detection of GRB 080810
  34. GRB 080810: Swift/UVOT Refined Analysis
  35. GRB 080810: D50 optical observation
  36. GRB 080810: Kanazawa optical observation
  37. GRB 080810: Swift-XRT Team refined analysis
  38. GRB 080810: Enhanced Swift-XRT position
  39. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  40. GRB 080810, Swift-BAT refined analysis
  41. GRB 080810: Swift detection of a burst with a bright optical afterglow
  42. GRB 080723B: XMM-Newton observation
  43. GRB 080804: GROND observations
  44. GRB 080727B: Late VLT imaging
  45. GRB 080805: Swift-XRT Refined Analysis
  46. GRB 080805: Swift/UVOT Upper Limits
  47. GRB 080804: Swift-XRT Refined Analysis
  48. GRB 080804: Swift/UVOT Refined Analysis
  49. GRB 080805, Swift-BAT refined analysis
  50. GRB 080804, Swift-BAT refined analysis
  51. GRB 080804: Enhanced Swift-XRT position
  52. GRB 080804: Faulkes Telescope South observations
  53. GRB080805 optical limit by "Pi of the Sky"
  54. GRB 080805: GROND detection of possible afterglow
  55. GRB 080805: Swift detection of a burst
  56. GRB 080804: Swift detection of a burst with optical afterglow
  57. GRB 080804: ROTSE-III Detection of Optical Counterpart
  58. GRB 080802: Swift/UVOT Upper Limits
  59. GRB 080802: Swift-XRT Refined Analysis
  60. GRB 080802, Swift-BAT refined analysis
  61. GRB 080802: Swift detection of a probable burst
  62. GRB 080727C: Suzaku WAM observation of the prompt emission
  63. GRB 080727A: Early IR observations
  64. GRB 080727C: TAROT Calern observatory optical observations
  65. GRB 080727B: KAIT photometry and an early lightcurve break
  66. GRB 080727B: GROND redshift limit
  67. GRB 080727C, Swift-BAT refined analysis
  68. GRB 080727C: Swift/UVOT Upper Limits
  69. Konus-Wind observation of GRB 080727B
  70. GRB 080727C: Swift XRT refined analysis
  71. GRB 080727C: Enhanced Swift-XRT position
  72. GRB 080727B: REM NIR afterglow prompt detection
  73. GRB080727C: RTT150 optical observations
  74. GRB 080727C: Swift detection of a burst
  75. Swift detection of XTE J1701-407
  76. GRB 080727B: Swift/UVOT Upper Limits
  77. BAT Trigger 318150 is not a GRB
  78. GRB 080727B: Swift-XRT refined analysis
  79. GRB 080727B, Swift-BAT refined analysis
  80. GRB 080727A, Swift-BAT refined analysis
  81. GRB 080727A: Swift-XRT refined analysis
  82. GRB080727A: Swift/UVOT Upper Limits
  83. GRB 080727B: Enhanced Swift-XRT position
  84. GRB 080727A: Enhanced Swift-XRT position
  85. GRB 080727B: Swift detection of a bright burst
  86. GRB 080727: Swift detection of a burst
  87. GRB 080725, Swift-BAT refined analysis
  88. GRB 080723A: optical upper limit
  89. GRB080723B: Swift/UVOT Upper Limits
  90. GRB 080725: Swift detection of a burst
  91. GRB 080723A: Swift/UVOT Upper Limits
  92. GRB 080723B - correction to flux conversion factor
  93. GRB 080723B - Swift-XRT refined analysis
  94. GRB 080723B - Swift-XRT position
  95. GRB 080723, Swift-BAT refined analysis
  96. GRB 080723A: Swift-XRT refined analysis
  97. GRB 080723B: Detection and Localization by SuperAGILE
  98. GRB 080723: Enhanced Swift-XRT position
  99. GRB 080723: Swift detection of a burst
  100. TNG/DOLORES redshift for GRB080721

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