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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"

27403 results found.

  1. Enhanced Swift-XRT position of SGR 0501+4516
  2. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  3. GRB080823: Fermi Gamma-ray Burst Monitor detection
  4. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  5. Konus-Wind observation of GRB 080825B
  6. GRB080825C: GLAST Burst Monitor detection
  7. GRB 080825B: Swift-XRT team analysis
  8. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  9. Suzaku ToO Observation of SGR 0501+4516
  10. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  11. GRB 080825B: GRB Localization by SuperAGILE
  12. Radio Detection of SGR 0501+4516
  13. GRB 080822B, Swift-BAT refined analysis
  14. SGR 0501+4516: Astrotel-Caucasus optical observations
  15. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  16. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  17. SGR 0501+4516: optical observations
  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. GRB080818B: GLAST Burst Monitor detection
  21. GRB 080822: Swift detection of a short burst
  22. GLAST Burst Monitor detection of a GRB: 080816B
  23. GLAST Burst Monitor detection of GRB 080818
  24. GLAST Burst Monitor detection of GRB080817B
  25. GLAST Burst Monitor detection of GRB 080817
  26. GLAST Burst Monitor detection of GRB080816
  27. GRB080810 - optical observations
  28. GLAST Burst Monitor detection of GRB 080812
  29. Radio detection of GRB 080810 with the VLA
  30. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  31. GLAST Burst Monitor detection of GRB 080810
  32. First GLAST Burst Monitor GRB Circulars
  33. GRB 080810: Swift/UVOT Refined Analysis
  34. GRB 080810: Liverpool Telescope observations
  35. GRB 080810: Kanazawa optical observation
  36. GRB 080810: OSN follow-up
  37. GRB 080810: Swift-XRT Team refined analysis
  38. GRB 080810: Enhanced Swift-XRT position
  39. GRB 080810: KANATA optical-NIR observation, update
  40. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  41. GRB 080810, Swift-BAT refined analysis
  42. GRB 080810 : optical observation with KANATA
  43. GRB 080810: Swift detection of a burst with a bright optical afterglow
  44. GRB 080723B: GROND upper limits
  45. GRB 080723B: XMM-Newton observation
  46. GRB 080805: Faulkes Telescope South optical observations
  47. GRB 080804: GROND observations
  48. GRB 080727B: Late VLT imaging
  49. GRB 080805: Swift-XRT Refined Analysis
  50. GRB 080805: Swift/UVOT Upper Limits
  51. GRB 080804: Swift-XRT Refined Analysis
  52. GRB 080804: Swift/UVOT Refined Analysis
  53. GRB 080805, Swift-BAT refined analysis
  54. GRB 080804, Swift-BAT refined analysis
  55. GRB 080804: Enhanced Swift-XRT position
  56. GRB 080804: Faulkes Telescope South observations
  57. GRB080805 optical limit by "Pi of the Sky"
  58. GRB 080805: Afterglow confirmation
  59. GRB 080805: GROND detection of possible afterglow
  60. GRB 080805: Swift detection of a burst
  61. GRB 080804: Swift detection of a burst with optical afterglow
  62. GRB 080804: ROTSE-III Detection of Optical Counterpart
  63. GRB 080802: Swift/UVOT Upper Limits
  64. GRB 080802: UVI Telescope Upper Limit
  65. GRB 080802, Swift-BAT refined analysis
  66. GRB 080802: Swift detection of a probable burst
  67. GRB 080727C: Suzaku WAM observation of the prompt emission
  68. GRB 080727B: IR photometry
  69. GRB 080727C: TAROT Calern observatory optical observations
  70. GRB 080727B: KAIT photometry and an early lightcurve break
  71. GRB 080727C, Swift-BAT refined analysis
  72. GRB 080727C: Swift/UVOT Upper Limits
  73. GRB 080727C: Swift XRT refined analysis
  74. GRB 080727C: Liverpool Telescope observations
  75. GRB 080727A: VLT upper limits
  76. GRB 080727C: Enhanced Swift-XRT position
  77. GRB080727C: RTT150 optical observations
  78. GRB 080727C: Swift detection of a burst
  79. Swift detection of XTE J1701-407
  80. GRB 080727B: Swift/UVOT Upper Limits
  81. BAT Trigger 318150 is not a GRB
  82. GRB 080727B: Swift-XRT refined analysis
  83. GRB 080727B, Swift-BAT refined analysis
  84. GRB 080727A, Swift-BAT refined analysis
  85. GRB 080727A: Swift-XRT refined analysis
  86. GRB080727A: Swift/UVOT Upper Limits
  87. GRB 080727B: Enhanced Swift-XRT position
  88. GRB 080727A: Enhanced Swift-XRT position
  89. GRB 080727B: REM prompt observations
  90. GRB 080727B: Swift detection of a bright burst
  91. GRB 080727: Swift detection of a burst
  92. GRB 080726: GRB Localization by SuperAGILE
  93. GRB 080725, Swift-BAT refined analysis
  94. GRB 080723A: optical upper limit
  95. GRB080723B: Swift/UVOT Upper Limits
  96. GRB 080725: REM prompt observations
  97. GRB 080723A: Swift/UVOT Upper Limits
  98. VLA radio upper limit on GRB 080721
  99. GRB 080723B - correction to flux conversion factor
  100. GRB 080723B - Swift-XRT refined analysis

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