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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"

4902 results found.

  1. GRB 090217: Suzaku WAM observation of the prompt emission
  2. IPN localization of GRB 090217
  3. GRB 090126A: Swift-XRT Refined Analysis
  4. GRB 090123: GROND detection
  5. GRB 090123: Swift XRT refined analysis
  6. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  7. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  8. GRB 090118: Swift-XRT observations
  9. GRB 090113: Swift-XRT refined analysis
  10. GRB 090111: Swift-XRT refined analysis
  11. GRB 090102: WSRT Radio Observations
  12. GRB081230: Swift-XRT refined analysis
  13. GRB 081228: Swift-XRT Team refined analysis
  14. GRB 081228: TAROT Calern observatory optical observations
  15. GRB 081224: Suzaku WAM observation of the prompt emission
  16. GRB 081224: Fermi GBM Detection & LAT Localization
  17. GRB 081222, Swift-BAT refined analysis
  18. GRB 081222: Swift XRT refined analysis
  19. GRB081221: Fermi GBM observation
  20. GRB 081221: Gemini-N nIR imaging
  21. GRB 081221: further NOT observations
  22. GRB 081221: NOT observations
  23. Modification of Swift/UVOT response to bright GRBs
  24. GRB 081216: Suzaku WAM observation of the prompt emission
  25. GRB 081211: Swift XRT refined analysis
  26. GRB 081210: Swift-XRT refined analysis
  27. Radio observation of GRB 081121 with ATCA
  28. Radio observation of GRB 081118 with ATCA
  29. GRB 081206: Fermi GBM detection
  30. Radio observation of GRB 081109 with ATCA
  31. Radio observation of GRB 081104 with ATCA
  32. Radio observation of GRB 081029 with ATCA
  33. Radio observation of GRB 081008 with ATCA
  34. GRB 081204B: Fermi GBM detection
  35. GRB 081204: Swift XRT afterglow confirmation
  36. GRB081203A: Swift-XRT refined analysis
  37. GRB 081203A: optical observations
  38. VLA Radio upper limit on GRB 081126
  39. GRB 081128: Swift-XRT refined analysis
  40. GRB 081127: Swift-XRT refined analysis
  41. GRB 081126: Swift-XRT refined analysis
  42. GRB 081125: Fermi GBM detection
  43. GRB 081124: Fermi GBM detection
  44. GRB 081118: Fermi GBM detection.
  45. GRB 081122: Fermi GBM detection
  46. GRB 081121: GROND observations
  47. GRB 081118: Swift-XRT refined analysis
  48. GRB 081102: MASTER refind and final results
  49. GRB 081109B: Swift/UVOT refined analysis
  50. GRB 081109A: Swift-XRT refined analysis
  51. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  52. GRB 081104: refined XRT analysis
  53. Radio observation of GRB 080218b with ATCA
  54. GRB 081024B: BTA deep optical observations
  55. GRB081029: Swift XRT refined analysis
  56. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  57. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  58. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  59. Fermi-LAT observation of GRB 081024B
  60. GRB 081024: Faulkes Telescope North optical observations
  61. GRB 081022, Swift-BAT refined analysis
  62. GRB 081022: Swift detection of a burst
  63. GRB 081007: Rapid PROMPT Detections
  64. GRB081006: Fermi GBM detection
  65. GRB 081007: Early RAPTOR measurements of optical counterpart
  66. GRB 081007: Swift-XRT Team refined analysis
  67. GRB 080928: Fermi GBM detection
  68. GRB 080928: Swift-XRT refined analysis
  69. GRB 080916C: Fermi GBM Spectral Analysis
  70. GRB 080916A: Fermi GBM detection
  71. GRB 080915: Swift-XRT afterglow detection and analysis
  72. GRB 080913: GROND photo-z
  73. Swift Trigger 324116 is known source again
  74. GRB 080906: GROND observations of the optical/NIR afterglow
  75. GRB 080905A: NOT and VLT observations
  76. GRB 080903: Swift-XRT Refined Analysis
  77. Radio Detection of SGR 0501+4516: Retraction
  78. SGR 0501+4516: Decline in Activity
  79. SGR 0501+4516: Proximity to supernova remnant HB9
  80. SGR 0501+4516: Swift XRT measure of the spin period
  81. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  82. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  83. Radio Detection of SGR 0501+4516
  84. SGR 0501+4516: MDM Optical Observations
  85. SGR 0501+4516: Astrotel-Caucasus optical observations
  86. GLAST Burst Monitor detection of GRB 080818
  87. GRB 080810: RTT150 optical observations
  88. GRB 080810: Swift-XRT Team refined analysis
  89. GRB 080723B: GROND upper limits
  90. GRB 080804: GROND observations
  91. GRB080805 optical limit by "Pi of the Sky"
  92. GRB 080802: Swift-XRT Refined Analysis
  93. GRB 080727A: Early IR observations
  94. GRB 080727C: Swift XRT refined analysis
  95. GRB 080727B: Swift-XRT refined analysis
  96. GRB 080727A: Swift-XRT refined analysis
  97. GRB 080727B: Swift detection of a bright burst
  98. GRB 080723B - correction to flux conversion factor
  99. GRB 080723B - Swift-XRT refined analysis
  100. GRB 080723: Swift detection of a burst

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