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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"

20366 results found.

  1. GRB 080905A: optical afterglow
  2. GRB 080906: GROND observations of the optical/NIR afterglow
  3. GRB 080905B: Refined UVOT Analysis
  4. GRB 080905B: VLT redshift
  5. GRB 080905A: NOT and VLT observations
  6. GRB 080905B: Enhanced Swift-XRT position
  7. GRB 080906: Swift detection of a burst with optical afterglow
  8. GRB080825C: Fermi-LAT observations
  9. GRB 080905B: Swift detection of a burst with possible optical counterpart
  10. GRB 080905: Swift detection of a probably-short burst
  11. GRB 080903: Swift/UVOT Observations
  12. GRB 080903: Swift-XRT Refined Analysis
  13. GRB 080903: Enhanced Swift-XRT position
  14. GRB 080903: optical observations
  15. GRB 080903: Liverpool Telescope observations
  16. GRB 080903: Optical afterglow candidate
  17. GRB 080903: TAROT Calern observatory optical observations
  18. GRB 080903: Swift detection of a burst
  19. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  20. SGR 0501+4516: Confirmation of the NIR counterpart
  21. GRB080828: Swift/UVOT Upper Limits
  22. SGR 0501+4516: Detection of possible optical counterpart
  23. GRB080825B: Swift/UVOT Upper Limits
  24. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  25. Swift-BAT trigger 322590 is not a GRB
  26. Swift trigger 322590: BAT detection of a possible burst
  27. Enhanced Swift-XRT position of SGR 0501+4516
  28. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  29. GRB 080825B: Swift-XRT team analysis
  30. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  31. Suzaku ToO Observation of SGR 0501+4516
  32. Konus-Wind observations of new SGR 0501+4516
  33. SGR 0501+4516: Astrotel-Caucasus optical observations
  34. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  35. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  36. SGR 0501+4516: optical observations
  37. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  38. GRB 080822: Swift detection of a short burst
  39. GLAST Burst Monitor detection of GRB080816
  40. GRB080810 - optical observations
  41. Radio detection of GRB 080810 with the VLA
  42. First GLAST Burst Monitor GRB Circulars
  43. GRB 080810: Swift/UVOT Refined Analysis
  44. GRB 080810: Liverpool Telescope observations
  45. GRB 080810: Kanazawa optical observation
  46. GRB 080810: OSN follow-up
  47. GRB 080810: Enhanced Swift-XRT position
  48. GRB 080810: KANATA optical-NIR observation, update
  49. GRB 080810 : optical observation with KANATA
  50. GRB 080810: Swift detection of a burst with a bright optical afterglow
  51. GRB 080723B: GROND upper limits
  52. GRB 080805: Faulkes Telescope South optical observations
  53. GRB 080804: GROND observations
  54. GRB 080727B: Late VLT imaging
  55. GRB 080805: Swift-XRT Refined Analysis
  56. GRB 080805: Swift/UVOT Upper Limits
  57. GRB 080804: Swift/UVOT Refined Analysis
  58. GRB 080804: Enhanced Swift-XRT position
  59. GRB 080804: Faulkes Telescope South observations
  60. GRB080805 optical limit by "Pi of the Sky"
  61. GRB 080805: Afterglow confirmation
  62. GRB 080805: GROND detection of possible afterglow
  63. GRB 080805: Swift detection of a burst
  64. GRB 080804: Swift detection of a burst with optical afterglow
  65. GRB 080802: Swift/UVOT Upper Limits
  66. GRB 080802: UVI Telescope Upper Limit
  67. GRB 080802: Swift detection of a probable burst
  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/UVOT Upper Limits
  72. GRB 080727C: Liverpool Telescope observations
  73. GRB 080727A: VLT upper limits
  74. GRB 080727C: Enhanced Swift-XRT position
  75. GRB080727C: RTT150 optical observations
  76. GRB 080727C: Swift detection of a burst
  77. Swift detection of XTE J1701-407
  78. GRB 080727B: Swift/UVOT Upper Limits
  79. GRB080727A: Swift/UVOT Upper Limits
  80. GRB 080727B: Enhanced Swift-XRT position
  81. GRB 080727A: Enhanced Swift-XRT position
  82. GRB 080727B: REM prompt observations
  83. GRB 080727B: Swift detection of a bright burst
  84. GRB 080727: Swift detection of a burst
  85. GRB 080726: GRB Localization by SuperAGILE
  86. GRB 080723A: optical upper limit
  87. GRB080723B: Swift/UVOT Upper Limits
  88. GRB 080725: REM prompt observations
  89. GRB 080723A: Swift/UVOT Upper Limits
  90. VLA radio upper limit on GRB 080721
  91. GRB 080723, Swift-BAT refined analysis
  92. GRB 080723: Enhanced Swift-XRT position
  93. GRB 080723: Swift detection of a burst
  94. GRB 080721: Enhanced Swift-XRT position
  95. GRB 080721, Swift-BAT refined analysis
  96. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  97. Trigger 317393: Swift detection of a possible GRB
  98. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  99. GRB 080714: GROND confirmation of the optical/NIR afterglow
  100. GRB 080714: Swift/UVOT Detection of an Optical Afterglow

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