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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"

41067 results found.

  1. GRB 080905: Swift detection of a probably-short burst
  2. GRB 080903: Swift/UVOT Observations
  3. GRB 080903: Swift-XRT Refined Analysis
  4. GRB 080903: Enhanced Swift-XRT position
  5. GRB 080903, Swift-BAT refined analysis
  6. GRB 080903: optical observations
  7. GRB 080903: Liverpool Telescope observations
  8. GRB 080903: Astrotel-Caucasus optical observations
  9. GRB 080903: Optical afterglow candidate
  10. GRB 080903: TAROT Calern observatory optical observations
  11. GRB 080903: ROTSE-III Optical Limits
  12. GRB 080903: Swift detection of a burst
  13. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  14. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  15. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  16. nIR observations of SGR 0501+4516
  17. SGR 0501+4516: Confirmation of the NIR counterpart
  18. SGR 0501+4516: Detection of possible optical counterpart
  19. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  20. GRB080825B: Swift/UVOT Upper Limits
  21. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  22. Swift-BAT trigger 322590 is not a GRB
  23. Radio Detection of SGR 0501+4516: Retraction
  24. Swift trigger 322590: BAT detection of a possible burst
  25. SGR 0501+4516: XMM-Newton monitoring schedule
  26. GRB 080828: SuperAGILE GRB Localization
  27. SGR 0501+4516: Decline in Activity
  28. SGR 0501+4516: Proximity to supernova remnant HB9
  29. Enhanced Swift-XRT position of SGR 0501+4516
  30. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  31. SGR 0501+4516: Swift XRT measure of the spin period
  32. GRB080823: Fermi Gamma-ray Burst Monitor detection
  33. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  34. Konus-Wind observation of GRB 080825B
  35. GRB080825C: GLAST Burst Monitor detection
  36. GRB 080825B: Swift-XRT team analysis
  37. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  38. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  39. GRB080825: Afterglow confirmation and redshift estimate
  40. GRB 080825B - optical counterpart candidate
  41. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  42. GRB 080825B: GRB Localization by SuperAGILE
  43. Konus-Wind observations of new SGR 0501+4516
  44. INTEGRAL ToO Observation of SGR0501+4516
  45. Radio Detection of SGR 0501+4516
  46. SGR 0501+4516: MDM Optical Observations
  47. GRB 080822B, Swift-BAT refined analysis
  48. SGR 0501+4516: Astrotel-Caucasus optical observations
  49. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  50. SGR 0501+4516: WSRT Radio Observations
  51. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  52. GRB 080822B: MASTER optical observation
  53. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  54. SGR 0501+4516: optical observations
  55. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  56. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  57. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  58. GRB 080822B: Swift detection of a burst
  59. GRB080818B: GLAST Burst Monitor detection
  60. Third event from SGR 0501+4516
  61. GRB 080822 (SGR 0501+4516): archival optical observations
  62. New Soft Gamma Repeater 0501+4516 was GRB 080822
  63. GRB 080822: Swift detection of a short burst
  64. GLAST Burst Monitor detection of a GRB: 080816B
  65. GLAST Burst Monitor detection of GRB 080818
  66. GLAST Burst Monitor detection of GRB080817B
  67. GLAST Burst Monitor detection of GRB 080817
  68. GLAST Burst Monitor detection of GRB080816
  69. GRB080810 - optical observations
  70. GRB080810: optical observations
  71. GLAST Burst Monitor detection of GRB 080812
  72. Radio detection of GRB 080810 with the VLA
  73. GRB 080810: RTT150 optical observations
  74. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  75. GLAST Burst Monitor detection of GRB 080810
  76. GRB 080810: Liverpool and Faulkes North observations
  77. GRB 080810: RTT150 optical observations
  78. GRB080810: MITSuME optical observation
  79. First GLAST Burst Monitor GRB Circulars
  80. GRB 080810: Swift/UVOT Refined Analysis
  81. GRB 080810: optical observations
  82. GRB 080810: Liverpool Telescope observations
  83. GRB 080810: D50 optical observation
  84. GRB 080810: Kanazawa optical observation
  85. GRB 080810: OSN follow-up
  86. GRB 080810: Observations from NOT
  87. GRB 080810: RTT150 optical observations
  88. GRB 080810: Swift-XRT Team refined analysis
  89. GRB 080810: Enhanced Swift-XRT position
  90. GRB 080810: KANATA optical-NIR observation, update
  91. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  92. GRB 080810: Keck/HIRES Spectroscopy
  93. GRB 080810, Swift-BAT refined analysis
  94. GRB 080810 : optical observation with KANATA
  95. GRB 080810: Swift detection of a burst with a bright optical afterglow
  96. GRB 080723B: GROND upper limits
  97. GRB 080723B: XMM-Newton observation
  98. GRB 080805: VLT redshift update
  99. GRB 080805: Faulkes Telescope South optical observations
  100. GRB 080804: GROND observations

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