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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"

8475 results found.

  1. GRB 080916C: GROND Confirmation of the Optical Afterglow
  2. GRB 080919: Swift detection of a short burst
  3. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  4. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  5. GRB 080916B: Swift UVOT Refined Analysis
  6. GRB 080916B, Swift-BAT refined analysis
  7. GRB 080916A: Swift XRT refined analysis
  8. GRB 080916: REM candidate afterglow
  9. GRB 080916: Swift detection of a burst with optical afterglow
  10. GRB 080915, Swift-BAT refined analysis
  11. GRB 080913: REM NIR early observations
  12. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  13. GRB 080913: Swift detection of a burst
  14. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  15. GRB 080905A: MITSuME Akeno optical upper limits
  16. GRB 080905B: VLT redshift
  17. GRB 080906: Swift detection of a burst with optical afterglow
  18. GRB 080905B: Swift detection of a burst with possible optical counterpart
  19. GRB 080905: Swift detection of a probably-short burst
  20. GRB 080903: optical observations
  21. GRB 080903: Liverpool Telescope observations
  22. GRB 080903: Astrotel-Caucasus optical observations
  23. GRB 080903: Optical afterglow candidate
  24. GRB 080903: Swift detection of a burst
  25. Recent VLA non-detection of SGR 0501+4516
  26. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  27. nIR observations of SGR 0501+4516
  28. INTEGRAL ToO observation of SGR0501+4516
  29. Swift-BAT trigger 322590 is not a GRB
  30. VLA non-detection of SGR 0501+4516
  31. Swift trigger 322590: BAT detection of a possible burst
  32. GRB080825: Afterglow confirmation and redshift estimate
  33. GRB 080825B - optical counterpart candidate
  34. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  35. SGR 0501+4516: WSRT Radio Observations
  36. GRB 080822B: MASTER optical observation
  37. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  38. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  39. GRB 080822: Swift detection of a short burst
  40. GRB 080810: Swift detection of a burst with a bright optical afterglow
  41. GRB 080804: ATCA Radio Observations
  42. GRB 080805, Swift-BAT refined analysis
  43. GRB080804: Gemini South redshift confirmation
  44. GRB 080805: Afterglow confirmation
  45. GRB 080805: GROND detection of possible afterglow
  46. GRB 080805: Swift detection of a burst
  47. GRB 080804: Swift detection of a burst with optical afterglow
  48. GRB 080804: ROTSE-III Detection of Optical Counterpart
  49. GRB 080802: Swift detection of a probable burst
  50. GRB 080727C: Swift detection of a burst
  51. GRB 080727B, Swift-BAT refined analysis
  52. GRB 080727B: REM prompt observations
  53. GRB 080727B: Swift detection of a bright burst
  54. GRB 080727: Swift detection of a burst
  55. GRB 080723A: optical upper limit
  56. GRB 080725: REM prompt observations
  57. GRB 080723B: AGILE GRID and MCAL results
  58. GRB 080723: Swift detection of a burst
  59. TNG/DOLORES redshift for GRB080721
  60. GRB 080721: UVOT Follow-Up Observations
  61. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  62. Trigger 317393: Swift detection of a possible GRB
  63. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  64. GRB 080714: Swift detection of a burst
  65. GRB 080702A: optical upper limit
  66. GRB 080710, Swift-BAT refined analysis
  67. GRB 080710: KAIT OA candidate
  68. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  69. GRB 080707: Swift detection of a burst
  70. GRB 080703: UVOT Follow-Up Observation
  71. GRB 080703: Swift detection of a burst with optical afterglow
  72. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  73. GRB 080702A: MITSuME Akeno optical upper limits
  74. GRB 080702B : Burst detected in BAT during Swift slew
  75. GRB 080702: Swift detection of a short burst
  76. GRB 080701A, Swift-BAT refined analysis
  77. Trigger 315630: Swift detection of a possible burst
  78. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  79. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  80. GRB 070809: Putative host galaxy and redshift
  81. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  82. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  83. GRB 080613B, Swift-BAT refined analysis
  84. GRB 080613B: Swift detection of a burst
  85. GRB 080613: Faulkes Telescope North optical candidate
  86. Swift observations of BAT Slew Survey event (Trigger=010)
  87. GRB 080603A: final Swift-XRT observations.
  88. GRB 080607: AGILE-MCAL observation of the prompt emission
  89. GRB 080607: Swift detection of a burst with optical afterglow
  90. GRB 080607: ROTSE-III Detection of Optical Counterpart
  91. GRB 080605: GROND detection of the optical afterglow candidate
  92. GRB 080605: Liverpool Telescope optical afterglow candidate
  93. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  94. GRB 080603A: Swift-XRT detection of the afterglow
  95. GRB 080604: Swift detection of a burst with an optical afterglow
  96. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  97. GRB 080603B: Swift detection of a burst with optical afterglow
  98. GRB 080603: Gemini-North redshift
  99. GRB 080603 OA candidate
  100. Possible GRB080603: Faulkes Telescope North optical afterglow candidate

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