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"

19608 results found.

  1. GRB 100702A: Swift detection of a short burst
  2. GRB 100615A: Chandra X-ray ToO Observation
  3. GRB 100213B: Detection of Fading Optical Afterglow
  4. GRB 100625A: Fermi GBM detection
  5. GRB 100628A: Swift XRT refined position
  6. GRB100625A: GROND confirmation of constant source
  7. GRB100628A : MOA optical upper limit
  8. GRB 100628A: Swift/UVOT Upper Limits
  9. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  10. GRB 100628A: INTEGRAL SPI-ACS light curve
  11. GRB 100628A: Swift-BAT refined analysis
  12. GRB 100628A: Swift detection of a short hard burst
  13. Swift-BAT trigger 426048 is not a burst
  14. GRB 100614A: CrAO optical limit
  15. GRB 100625A: Swift/UVOT Upper Limits
  16. GRB 100625A: Swift-BAT refined analysis
  17. Konus-Wind observation of GRB 100625A
  18. GRB 100625A : IRSF/SIRIUS NIR upper limit
  19. GRB 100625A: Swift-XRT Team refined analysis
  20. GRB 100625A: Enhanced Swift-XRT position
  21. GRB100625A : MOA optical upper limit
  22. GRB 100625A: Swift detection of a short hard burst
  23. GRB 100418A: late time optical observations
  24. Konus-Wind observation of GRB 100621A
  25. GRB 100621A: IRSF/SIRIUS NIR Observation
  26. GRB 100621A MOA-II optical limit
  27. GRB 100621A: Swift/UVOT observations
  28. GRB 100621A: Swift XRT refined analysis
  29. GRB 100621A: Swift-BAT refined analysis
  30. GRB 100621A: GROND observation of bright NIR afterglow
  31. GRB 100621A: Enhanced Swift-XRT position
  32. GRB 100621A: Prompt enhanced Swift-XRT position
  33. GRB 100621A: ROTSE-III Optical Limits
  34. GRB 100621A: Swift detection of a burst
  35. GRB 100606A: Optical Limits
  36. GRB 100619A: Fermi GBM detection
  37. GRB 100619A: Swift/UVOT Upper Limits
  38. GRB 100619A: Swift-XRT refind analysis
  39. GRB 100619A: Enhanced Swift-XRT position
  40. GRB 100619A: Swift-BAT refined analysis
  41. GRB 100619A: Swift detection of a burst
  42. GRB 100615A: Swift/UVOT Upper Limits
  43. GRB 100614A: Swift/UVOT Upper Limits
  44. GRB 100614A: MASTER-Net optical alert observations
  45. GRB 100614A: Swift-BAT refined analysis
  46. GRB 100615A: Fermi GBM detection
  47. GRB 100615A: Swift-BAT refined analysis
  48. GRB 100614A: Enhanced Swift-XRT position
  49. GRB 100615A: Enhanced Swift-XRT position
  50. GRB 100615A: Swift-XRT refined analysis
  51. GRB 100614A: Swift-XRT refined analysis
  52. GRB 100615A: PAIRITEL NIR Upper Limits
  53. GRB 100615A: Swift detection of a burst
  54. GRB 100614A: Liverpool Telescope Observations
  55. GRB 100614A: Swift detection of a burst
  56. GRB 100606A: Suzaku WAM observation of the prompt emission
  57. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  58. Konus-Wind observation of GRB 100606A
  59. Radio detection of GRB100418a with ATCA
  60. GRB 100606A: Swift/UVOT Upper Limits
  61. GRB 100606A Swift-XRT refined analysis
  62. GRB 100606A: Swift-BAT refined analysis
  63. GRB 100606A: Enhanced Swift-XRT position
  64. Swift Trigger 424040 is not a GRB
  65. GRB 100606A: Prompt enhanced Swift-XRT position
  66. GRB 100606A: Swift detection of a burst
  67. Swift detection of outburst from the SFXT IGR J18410-0535
  68. GRB 100111A: Maidanak optical observations
  69. GRB 100418A: Maidanak optical observations
  70. GRB 100513A: CrAO optical observations
  71. GRB 100514A: CrAO optical observations
  72. GRB 100526A: optical upper limit
  73. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  74. GRB100526B: GROND Upper limits
  75. GRB 100526B: Swift-XRT confirmation of fading afterglow
  76. GRB 100526B: Swift/UVOT Upper Limits
  77. GRB 100526A: Swift/UVOT Upper Limits
  78. GRB 100526A: Swift XRT refined analysis
  79. GRB 100526B: Swift-BAT refined analysis
  80. GRB 100526B: Swift XRT/UVOT observations
  81. GRB 100526A: Swift-BAT refined analysis
  82. GRB 100526A: Enhanced Swift-XRT position
  83. GRB 100526B: Swift detection of a probable GRB
  84. GRB 100526A: MASTER-Net optical alert observations
  85. GRB 100526A: Swift detection of a burst
  86. Konus-Wind observation of GRB 100522A
  87. GRB100522A: Suzaku WAM observation of the prompt emission
  88. GRB 100522A: GROND observations, upper limits
  89. Swift/UVOT observations of GRB100522A.
  90. GRB 100522A: Fermi GBM observation
  91. GRB 100522A: Swift XRT refined analysis
  92. GRB 100522A, Swift-BAT refined analysis
  93. GRB 100522A: Enhanced Swift-XRT position
  94. GRB 100522A: BOOTES-2 optical limit
  95. GRB 100522A: Swift detection of a burst
  96. GRB 100418A: CrAO optical observations
  97. GRB 100518A: Swift/UVOT Upper Limits
  98. GRB 100518A: Swift-XRT refined analysis
  99. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  100. Swift-BAT trigger 422437 is not anything astrophysical

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