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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"

19599 results found.

  1. Swift Trigger 324116 is known source again
  2. Swift Trigger 324112 is known source Swift J1842.5-1124
  3. GRB 080906: Refined Swift/UVOT Observations
  4. GRB 080906: Swift-XRT Refined Analysis
  5. GRB 080906, Swift-BAT refined analysis
  6. GRB 080906: GROND observations of the optical/NIR afterglow
  7. GRB 080905B: Swift-XRT Refined Analysis
  8. GRB 080905B: Refined UVOT Analysis
  9. GRB 080905B: Enhanced Swift-XRT position
  10. GRB 080905B, Swift-BAT refined analysis
  11. GRB 080905A, Swift-BAT refined analysis
  12. GRB 080906: Swift detection of a burst with optical afterglow
  13. GRB 080905A: Swift-XRT Refined Analysis
  14. GRB 080905B: Swift detection of a burst with possible optical counterpart
  15. GRB 080905: R & I-band optical observations
  16. GRB 080905: Swift detection of a probably-short burst
  17. GRB 080903: Swift/UVOT Observations
  18. GRB 080903: Swift-XRT Refined Analysis
  19. GRB 080903: Enhanced Swift-XRT position
  20. GRB 080903, Swift-BAT refined analysis
  21. GRB 080903: Astrotel-Caucasus optical observations
  22. GRB 080903: TAROT Calern observatory optical observations
  23. GRB 080903: ROTSE-III Optical Limits
  24. GRB 080903: Swift detection of a burst
  25. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  26. GRB080828: Swift/UVOT Upper Limits
  27. GRB080825B: Swift/UVOT Upper Limits
  28. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  29. Swift-BAT trigger 322590 is not a GRB
  30. Swift trigger 322590: BAT detection of a possible burst
  31. SGR 0501+4516: Decline in Activity
  32. SGR 0501+4516: Proximity to supernova remnant HB9
  33. Enhanced Swift-XRT position of SGR 0501+4516
  34. SGR 0501+4516: Swift XRT measure of the spin period
  35. GRB 080825B: Swift-XRT team analysis
  36. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  37. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  38. Konus-Wind observations of new SGR 0501+4516
  39. SGR 0501+4516: MDM Optical Observations
  40. GRB 080822B, Swift-BAT refined analysis
  41. SGR 0501+4516: WSRT Radio Observations
  42. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  43. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  44. SGR 0501+4516: optical observations
  45. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  46. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  47. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  48. GRB 080822B: Swift detection of a burst
  49. Third event from SGR 0501+4516
  50. New Soft Gamma Repeater 0501+4516 was GRB 080822
  51. GRB 080822: Swift detection of a short burst
  52. Radio detection of GRB 080810 with the VLA
  53. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  54. GLAST Burst Monitor detection of GRB 080810
  55. GRB 080810: Swift/UVOT Refined Analysis
  56. GRB 080810: D50 optical observation
  57. GRB 080810: Kanazawa optical observation
  58. GRB 080810: Swift-XRT Team refined analysis
  59. GRB 080810: Enhanced Swift-XRT position
  60. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  61. GRB 080810, Swift-BAT refined analysis
  62. GRB 080810: Swift detection of a burst with a bright optical afterglow
  63. GRB 080723B: XMM-Newton observation
  64. GRB 080727B: Late VLT imaging
  65. GRB 080805: Swift-XRT Refined Analysis
  66. GRB 080805: Swift/UVOT Upper Limits
  67. GRB 080804: Swift-XRT Refined Analysis
  68. GRB 080804: Swift/UVOT Refined Analysis
  69. GRB 080805, Swift-BAT refined analysis
  70. GRB 080804, Swift-BAT refined analysis
  71. GRB 080804: Enhanced Swift-XRT position
  72. GRB 080804: Faulkes Telescope South observations
  73. GRB080805 optical limit by "Pi of the Sky"
  74. GRB 080805: Swift detection of a burst
  75. GRB 080804: Swift detection of a burst with optical afterglow
  76. GRB 080804: ROTSE-III Detection of Optical Counterpart
  77. GRB 080802: Swift/UVOT Upper Limits
  78. GRB 080802: Swift-XRT Refined Analysis
  79. GRB 080802, Swift-BAT refined analysis
  80. GRB 080802: Swift detection of a probable burst
  81. GRB 080727C: Suzaku WAM observation of the prompt emission
  82. GRB 080727C: TAROT Calern observatory optical observations
  83. GRB 080727B: GROND redshift limit
  84. GRB 080727C, Swift-BAT refined analysis
  85. GRB 080727C: Swift/UVOT Upper Limits
  86. Konus-Wind observation of GRB 080727B
  87. GRB 080727C: Swift XRT refined analysis
  88. GRB 080727C: Enhanced Swift-XRT position
  89. GRB080727C: RTT150 optical observations
  90. GRB 080727C: Swift detection of a burst
  91. Swift detection of XTE J1701-407
  92. GRB 080727B: Swift/UVOT Upper Limits
  93. BAT Trigger 318150 is not a GRB
  94. GRB 080727B: Swift-XRT refined analysis
  95. GRB 080727B, Swift-BAT refined analysis
  96. GRB 080727A, Swift-BAT refined analysis
  97. GRB 080727A: Swift-XRT refined analysis
  98. GRB080727A: Swift/UVOT Upper Limits
  99. GRB 080727B: Enhanced Swift-XRT position
  100. GRB 080727A: Enhanced Swift-XRT position

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