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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"

8477 results found.

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

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