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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"

19594 results found.

  1. GRB 080906: GROND observations of the optical/NIR afterglow
  2. GRB 080905B: Swift-XRT Refined Analysis
  3. GRB 080905B: Refined UVOT Analysis
  4. GRB 080905B: Enhanced Swift-XRT position
  5. GRB 080905B, Swift-BAT refined analysis
  6. GRB 080905A, Swift-BAT refined analysis
  7. GRB 080906: Swift detection of a burst with optical afterglow
  8. GRB 080905A: Swift-XRT Refined Analysis
  9. GRB 080905B: Swift detection of a burst with possible optical counterpart
  10. GRB 080905: R & I-band optical observations
  11. GRB 080905: Swift detection of a probably-short burst
  12. GRB 080903: Swift/UVOT Observations
  13. GRB 080903: Swift-XRT Refined Analysis
  14. GRB 080903: Enhanced Swift-XRT position
  15. GRB 080903, Swift-BAT refined analysis
  16. GRB 080903: Astrotel-Caucasus optical observations
  17. GRB 080903: TAROT Calern observatory optical observations
  18. GRB 080903: ROTSE-III Optical Limits
  19. GRB 080903: Swift detection of a burst
  20. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  21. GRB080828: Swift/UVOT Upper Limits
  22. GRB080825B: Swift/UVOT Upper Limits
  23. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  24. Swift-BAT trigger 322590 is not a GRB
  25. Swift trigger 322590: BAT detection of a possible burst
  26. SGR 0501+4516: Decline in Activity
  27. SGR 0501+4516: Proximity to supernova remnant HB9
  28. Enhanced Swift-XRT position of SGR 0501+4516
  29. SGR 0501+4516: Swift XRT measure of the spin period
  30. GRB 080825B: Swift-XRT team analysis
  31. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  32. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  33. Konus-Wind observations of new SGR 0501+4516
  34. SGR 0501+4516: MDM Optical Observations
  35. GRB 080822B, Swift-BAT refined analysis
  36. SGR 0501+4516: WSRT Radio Observations
  37. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  38. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  39. SGR 0501+4516: optical observations
  40. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  41. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  42. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  43. GRB 080822B: Swift detection of a burst
  44. Third event from SGR 0501+4516
  45. New Soft Gamma Repeater 0501+4516 was GRB 080822
  46. GRB 080822: Swift detection of a short burst
  47. Radio detection of GRB 080810 with the VLA
  48. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  49. GLAST Burst Monitor detection of GRB 080810
  50. GRB 080810: Swift/UVOT Refined Analysis
  51. GRB 080810: D50 optical observation
  52. GRB 080810: Kanazawa optical observation
  53. GRB 080810: Swift-XRT Team refined analysis
  54. GRB 080810: Enhanced Swift-XRT position
  55. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  56. GRB 080810, Swift-BAT refined analysis
  57. GRB 080810: Swift detection of a burst with a bright optical afterglow
  58. GRB 080723B: XMM-Newton observation
  59. GRB 080727B: Late VLT imaging
  60. GRB 080805: Swift-XRT Refined Analysis
  61. GRB 080805: Swift/UVOT Upper Limits
  62. GRB 080804: Swift-XRT Refined Analysis
  63. GRB 080804: Swift/UVOT Refined Analysis
  64. GRB 080805, Swift-BAT refined analysis
  65. GRB 080804, Swift-BAT refined analysis
  66. GRB 080804: Enhanced Swift-XRT position
  67. GRB 080804: Faulkes Telescope South observations
  68. GRB080805 optical limit by "Pi of the Sky"
  69. GRB 080805: Swift detection of a burst
  70. GRB 080804: Swift detection of a burst with optical afterglow
  71. GRB 080804: ROTSE-III Detection of Optical Counterpart
  72. GRB 080802: Swift/UVOT Upper Limits
  73. GRB 080802: Swift-XRT Refined Analysis
  74. GRB 080802, Swift-BAT refined analysis
  75. GRB 080802: Swift detection of a probable burst
  76. GRB 080727C: Suzaku WAM observation of the prompt emission
  77. GRB 080727C: TAROT Calern observatory optical observations
  78. GRB 080727B: GROND redshift limit
  79. GRB 080727C, Swift-BAT refined analysis
  80. GRB 080727C: Swift/UVOT Upper Limits
  81. Konus-Wind observation of GRB 080727B
  82. GRB 080727C: Swift XRT refined analysis
  83. GRB 080727C: Enhanced Swift-XRT position
  84. GRB080727C: RTT150 optical observations
  85. GRB 080727C: Swift detection of a burst
  86. Swift detection of XTE J1701-407
  87. GRB 080727B: Swift/UVOT Upper Limits
  88. BAT Trigger 318150 is not a GRB
  89. GRB 080727B: Swift-XRT refined analysis
  90. GRB 080727B, Swift-BAT refined analysis
  91. GRB 080727A, Swift-BAT refined analysis
  92. GRB 080727A: Swift-XRT refined analysis
  93. GRB080727A: Swift/UVOT Upper Limits
  94. GRB 080727B: Enhanced Swift-XRT position
  95. GRB 080727A: Enhanced Swift-XRT position
  96. GRB 080727B: Swift detection of a bright burst
  97. GRB 080727: Swift detection of a burst
  98. GRB 080725, Swift-BAT refined analysis
  99. GRB 080723A: optical upper limit
  100. GRB080723B: Swift/UVOT Upper Limits

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