Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

5163 results found.

  1. GRB 090518: Swift-XRT refined analysis
  2. GRB 090516: Swift XRT refined analysis
  3. GRB 090509 - Zadko Telescope observations
  4. GRB 090510: UVOT refined analysis
  5. GRB 090510: Swift XRT refined analysis
  6. GRB 090510: Swift detection of a short hard burst
  7. GRB 090509: Swift detection of a burst
  8. GRB 090424: optical observations
  9. GRB 090429B: Swift XRT refined analysis
  10. GRB 090426: GAO 150cm telescope Optical Observation
  11. GRB 090423: millimeter detection
  12. GRB 090426: Swift-XRT refined analysis
  13. GRB 090424 : Lulin 1m telescope optical observations
  14. GRB 090424: THO optical observations
  15. GRB090423: Y-band limit
  16. GRB 090424 optical observations
  17. GRB 090424: Swift-XRT refined analysis
  18. GRB 090424: Fermi GBM Observation
  19. GRB 090423: Swift-XRT refined analysis
  20. GRB090418A Rc-band photometry
  21. GRB090423, RIMOTS optical upper limits
  22. GRB 090418A: optical observations
  23. GRB 090418A: Swift/UVOT Observations
  24. GRB 090419: Swift-XRT refined analysis
  25. VLA radio detection of GRB 090418
  26. GRB 090418: Swift XRT refined analysis
  27. GRB 090418: Swift-BAT refined analysis
  28. GRB 090418: Enhanced Swift-XRT position
  29. GRB 090418: Swift detection of a burst with optical afterglow
  30. GRB 090418 OA candidate
  31. GRB 090408b: IPN Triangulation
  32. GRB 090328b: IPN Triangulation
  33. GRB 090407: GROND upper limits
  34. GRB 090407: Swift-XRT refined analysis
  35. GRB 090404: Swift-XRT Team refined analysis
  36. GRB 090401A: Suzaku WAM observation of the prompt emission
  37. GRB 090401B: Swift XRT Refined Analysis
  38. GRB 090328: Radio afterglow detection
  39. GRB 090328B: Fermi GBM Detection
  40. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  41. GRB 090323: WSRT Radio Detection
  42. GRB 090327: Fermi GBM detection
  43. GRB 090320B: MASTER-Net prompt optical observations
  44. GRB 090323: Swift-XRT refined analysis
  45. GRB 090324: SuperAGILE Localization of a Long GRB
  46. GRB 090323 Gemini-South Redshift
  47. GRB 090323: P60 Afterglow Confirmation
  48. GRB 090323: GROND Detection of the Afterglow and Photo-z
  49. SGR J1550-5418: two Fermi GBM triggers on March 22
  50. GRB 090319: Fermi GBM detection
  51. GRB 090315: Suzaku WAM observation of the prompt emission
  52. GRB 090313: MITSuME Okayama observation
  53. GRB 090309: Swift-XRT refined analysis
  54. GRB 090308: Swift-XRT refined analysis
  55. GRB 090306B: Possible XRT afterglow
  56. Swift-BAT trigger 345396 is not a GRB
  57. GRB 090306: Swift detection of a possible burst
  58. IPN localization of short bright GRB 090227B
  59. SGR J1550-5418
  60. GRB 081211B: Nearby cluster
  61. GRB 090222: Fermi GBM detection
  62. GRB 090217: Suzaku WAM observation of the prompt emission
  63. IPN localization of GRB 090217
  64. GRB 090126A: Swift-XRT Refined Analysis
  65. GRB 090123: GROND detection
  66. GRB 090123: Swift XRT refined analysis
  67. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  68. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  69. GRB 090118: Swift-XRT observations
  70. GRB 090113: Swift-XRT refined analysis
  71. GRB 090111: Swift-XRT refined analysis
  72. GRB 090102: WSRT Radio Observations
  73. GRB081230: Swift-XRT refined analysis
  74. GRB 081228: Swift-XRT Team refined analysis
  75. GRB 081228: TAROT Calern observatory optical observations
  76. GRB 081224: Suzaku WAM observation of the prompt emission
  77. GRB 081224: Fermi GBM Detection & LAT Localization
  78. GRB 081222, Swift-BAT refined analysis
  79. GRB 081222: Swift XRT refined analysis
  80. GRB081221: Fermi GBM observation
  81. GRB 081221: Gemini-N nIR imaging
  82. GRB 081221: further NOT observations
  83. GRB 081221: NOT observations
  84. Modification of Swift/UVOT response to bright GRBs
  85. GRB 081216: Suzaku WAM observation of the prompt emission
  86. GRB 081211: Swift XRT refined analysis
  87. GRB 081210: Swift-XRT refined analysis
  88. Radio observation of GRB 081121 with ATCA
  89. Radio observation of GRB 081118 with ATCA
  90. GRB 081206: Fermi GBM detection
  91. Radio observation of GRB 081109 with ATCA
  92. Radio observation of GRB 081104 with ATCA
  93. Radio observation of GRB 081029 with ATCA
  94. Radio observation of GRB 081008 with ATCA
  95. GRB 081204B: Fermi GBM detection
  96. GRB 081204: Swift XRT afterglow confirmation
  97. GRB081203A: Swift-XRT refined analysis
  98. GRB 081203A: optical observations
  99. VLA Radio upper limit on GRB 081126
  100. GRB 081128: Swift-XRT refined analysis

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov