Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

38203 results found.

  1. Konus-Wind observation of GRB 100701B
  2. IPN triangulation of GRB 100701B
  3. Konus-Wind observation of GRB 100704A
  4. GRB 100703A: a short GRB detected by INTEGRAL
  5. GRB 100704A: Swift XRT refined analysis
  6. GRB 100704: Swift/UVOT Upper Limits
  7. GRB 100704A: Fermi GBM observation
  8. GRB 100704A: Swift-BAT refined analysis
  9. GRB 100704A: Enhanced Swift-XRT position
  10. GRB 100704A: Swift detection of a burst
  11. GRB 100615A: Additional Gemini/NIRI observations
  12. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  13. GRB 100702A, Swift-BAT refined analysis
  14. Fermi GBM trigger 299767472 (100702531) is not a GRB
  15. GRB 100702A: Swift XRT refined analysis
  16. Swift/UVOT observations of GRB100702A
  17. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  18. GRB 100701B: Fermi GBM detection
  19. GRB 100702A: Magellan near-IR observations
  20. GRB 100702A: VLT optical observations
  21. GRB 100702: ROTSE-III Optical Limits
  22. GRB 100702A: Swift detection of a short burst
  23. GRB 100615A: Chandra X-ray ToO Observation
  24. GRB 100213B: Detection of Fading Optical Afterglow
  25. GRB 100625A: Fermi GBM detection
  26. GRB 100628A: Second epoch of Magellan near-IR observations
  27. GRB 100628A: GROND optical/NIR observations of the host candidate
  28. GRB 100628A: Gemini North Observations
  29. GRB 100628A: Coincidence of source "G1" with revised XRT error circle
  30. GRB 100628A: Swift XRT refined position
  31. GRB100625A: GROND confirmation of constant source
  32. GRB 100625A Gemini-South 2nd epoch imaging
  33. GRB 090709A: Host galaxy detection
  34. GRB 100628A: Magellan near-IR observations
  35. GRB 100628A: Swift/UVOT Upper Limits
  36. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  37. GRB 100628A: INTEGRAL SPI-ACS light curve
  38. GRB 100625A: Magellan near-IR Observations
  39. GRB 100628A: Swift-BAT refined analysis
  40. GRB 100628A: Swift detection of a short hard burst
  41. GRB 100614A: CrAO optical limit
  42. GRB 100625A: Swift/UVOT Upper Limits
  43. GRB 100625A: Swift-BAT refined analysis
  44. Konus-Wind observation of GRB 100625A
  45. GRB 100625A : IRSF/SIRIUS NIR upper limit
  46. GRB 100625A: Swift-XRT Team refined analysis
  47. GRB 100625A: Gemini candidate afterglow
  48. GRB 100625A: Enhanced Swift-XRT position
  49. GRB100625A : MOA optical upper limit
  50. GRB 100625A: Swift detection of a short hard burst
  51. GRB 100418A: late time optical observations
  52. Konus-Wind observation of GRB 100621A
  53. GRB 100621A: IRSF/SIRIUS NIR Observation
  54. GRB 100621A MOA-II optical limit
  55. GRB 100619A: Correction to the Fermi GBM trigger time
  56. GRB 100621A: Swift/UVOT observations
  57. GRB 100621A: Swift XRT refined analysis
  58. GRB 100621A: VLT/X-shooter redshift
  59. GRB 100621A: Swift-BAT refined analysis
  60. GRB 100621A: GROND observation of bright NIR afterglow
  61. GRB 100621A: Enhanced Swift-XRT position
  62. GRB 100621A: Prompt enhanced Swift-XRT position
  63. GRB 100621A: ROTSE-III Optical Limits
  64. GRB 100621A: Swift detection of a burst
  65. GRB 100606A: Optical Limits
  66. GRB 100619A: Fermi GBM detection
  67. GRB 100619A: Swift/UVOT Upper Limits
  68. GRB 100619A: Swift-XRT refind analysis
  69. GRB 100619A: Enhanced Swift-XRT position
  70. GRB 100619A: Swift-BAT refined analysis
  71. GRB 100619A: Swift detection of a burst
  72. GRB 100614A: Gemini/NIRI Observations
  73. GRB 100615A: Gemini/NIRI Observations
  74. Fermi GBM trigger 100612038 is not a GRB
  75. GRB 100615A: Swift/UVOT Upper Limits
  76. GRB 100614A: Swift/UVOT Upper Limits
  77. GRB 100614A: NOT optical upper limits
  78. GRB 100614A: MASTER-Net optical alert observations
  79. GRB 100614A: Swift-BAT refined analysis
  80. GRB 100615A: Fermi GBM detection
  81. GRB 100615A: Swift-BAT refined analysis
  82. GRB 100614A: Enhanced Swift-XRT position
  83. GRB 100615A: Enhanced Swift-XRT position
  84. GRB 100615A: Swift-XRT refined analysis
  85. GRB 100614A: Swift-XRT refined analysis
  86. GRB 100614 : XMM-Newton observation
  87. GRB 100615A: GROND observations, upper limits
  88. GRB 100615A: PAIRITEL NIR Upper Limits
  89. GRB 100615A: NTT/Ultracam imaging
  90. GRB 100615A: Swift detection of a burst
  91. GRB 100614A: WHT I-band observations
  92. GRB 100614A: BOOTES-2/TELMA optical observations
  93. GRB 100614A: Liverpool Telescope Observations
  94. GRB 100614A: Swift detection of a burst
  95. GRB 100606A: Suzaku WAM observation of the prompt emission
  96. GRB 100606A: GROND observations
  97. Konus-Wind observation of GRB 100606A
  98. Radio detection of GRB100418a with ATCA
  99. GRB 100606A: Gemini-South imaging
  100. GRB 100606A: Swift/UVOT Upper Limits

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