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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"

37760 results found.

  1. GRB 080828: SuperAGILE GRB Localization
  2. SGR 0501+4516: Decline in Activity
  3. SGR 0501+4516: Proximity to supernova remnant HB9
  4. Enhanced Swift-XRT position of SGR 0501+4516
  5. SGR 0501+4516: Swift XRT measure of the spin period
  6. GRB080823: Fermi Gamma-ray Burst Monitor detection
  7. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  8. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  9. Konus-Wind observation of GRB 080825B
  10. GRB080825C: GLAST Burst Monitor detection
  11. GRB 080825B: Swift-XRT team analysis
  12. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  13. GRB080825: Afterglow confirmation and redshift estimate
  14. GRB 080825B - optical counterpart candidate
  15. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  16. GRB 080825B: GRB Localization by SuperAGILE
  17. Konus-Wind observations of new SGR 0501+4516
  18. SGR 0501+4516: MDM Optical Observations
  19. GRB 080822B, Swift-BAT refined analysis
  20. SGR 0501+4516: WSRT Radio Observations
  21. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  22. GRB 080822B: MASTER optical observation
  23. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  24. SGR 0501+4516: optical observations
  25. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  26. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  27. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  28. GRB 080822B: Swift detection of a burst
  29. GRB080818B: GLAST Burst Monitor detection
  30. Third event from SGR 0501+4516
  31. GRB 080822 (SGR 0501+4516): archival optical observations
  32. New Soft Gamma Repeater 0501+4516 was GRB 080822
  33. GRB 080822: Swift detection of a short burst
  34. GLAST Burst Monitor detection of a GRB: 080816B
  35. GLAST Burst Monitor detection of GRB 080818
  36. GLAST Burst Monitor detection of GRB080817B
  37. GLAST Burst Monitor detection of GRB 080817
  38. GLAST Burst Monitor detection of GRB080816
  39. GRB080810 - optical observations
  40. GRB080810: optical observations
  41. GLAST Burst Monitor detection of GRB 080812
  42. Radio detection of GRB 080810 with the VLA
  43. GRB 080810: RTT150 optical observations
  44. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  45. GLAST Burst Monitor detection of GRB 080810
  46. GRB 080810: Liverpool and Faulkes North observations
  47. GRB 080810: RTT150 optical observations
  48. GRB080810: MITSuME optical observation
  49. First GLAST Burst Monitor GRB Circulars
  50. GRB 080810: Swift/UVOT Refined Analysis
  51. GRB 080810: optical observations
  52. GRB 080810: Liverpool Telescope observations
  53. GRB 080810: D50 optical observation
  54. GRB 080810: Kanazawa optical observation
  55. GRB 080810: OSN follow-up
  56. GRB 080810: Observations from NOT
  57. GRB 080810: RTT150 optical observations
  58. GRB 080810: Swift-XRT Team refined analysis
  59. GRB 080810: Enhanced Swift-XRT position
  60. GRB 080810: KANATA optical-NIR observation, update
  61. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  62. GRB 080810: Keck/HIRES Spectroscopy
  63. GRB 080810, Swift-BAT refined analysis
  64. GRB 080810 : optical observation with KANATA
  65. GRB 080810: Swift detection of a burst with a bright optical afterglow
  66. GRB 080723B: GROND upper limits
  67. GRB 080723B: XMM-Newton observation
  68. GRB 080805: VLT redshift update
  69. GRB 080805: Faulkes Telescope South optical observations
  70. GRB 080804: GROND observations
  71. GRB 080727B: Late VLT imaging
  72. GRB 080804: ATCA Radio Observations
  73. GRB 080805: Swift-XRT Refined Analysis
  74. GRB 080805: Swift/UVOT Upper Limits
  75. GRB 080804: Swift-XRT Refined Analysis
  76. GRB 080804: Swift/UVOT Refined Analysis
  77. GRB 080805, Swift-BAT refined analysis
  78. GRB 080804, Swift-BAT refined analysis
  79. GRB 080804: Enhanced Swift-XRT position
  80. GRB080804: Gemini South redshift confirmation
  81. GRB 080804: Faulkes Telescope South observations
  82. GRB080805 optical limit by "Pi of the Sky"
  83. GRB 080805: VLT redshift
  84. GRB 080805: Afterglow confirmation
  85. GRB 080805: GROND detection of possible afterglow
  86. GRB 080805: Swift detection of a burst
  87. GRB 080804: UVES redshift
  88. GRB 080804: Swift detection of a burst with optical afterglow
  89. GRB 080804: ROTSE-III Detection of Optical Counterpart
  90. GRB 080802: Swift/UVOT Upper Limits
  91. GRB 080802: Swift-XRT Refined Analysis
  92. GRB 080802: UVI Telescope Upper Limit
  93. GRB 080802, Swift-BAT refined analysis
  94. GRB 080802: Swift detection of a probable burst
  95. GRB 080727C: Suzaku WAM observation of the prompt emission
  96. GRB 080727B: IR photometry
  97. GRB 080727A: Early IR observations
  98. GRB 080727C: TAROT Calern observatory optical observations
  99. GRB 080727B: KAIT photometry and an early lightcurve break
  100. GRB 080727B: GROND redshift limit

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