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"

23577 results found.

  1. GRB 100704: Swift/UVOT Upper Limits
  2. GRB100704A: MOA optical upper limit
  3. GRB 100704A: Enhanced Swift-XRT position
  4. GRB 100704A: Swift detection of a burst
  5. GRB 100615A: Additional Gemini/NIRI observations
  6. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  7. Swift/UVOT observations of GRB100702A
  8. GRB 100701B: Fermi GBM detection
  9. GRB 100702A: Magellan near-IR observations
  10. GRB 100702A: VLT optical observations
  11. GRB 100702: ROTSE-III Optical Limits
  12. GRB 100702A: Swift detection of a short burst
  13. GRB 100615A: Chandra X-ray ToO Observation
  14. GRB 100213B: Detection of Fading Optical Afterglow
  15. GRB 100628A: GROND optical/NIR observations of the host candidate
  16. GRB 100628A: Gemini North Observations
  17. GRB100625A: GROND confirmation of constant source
  18. GRB100628A : MOA optical upper limit
  19. GRB 090709A: Host galaxy detection
  20. GRB 100628A: Swift/UVOT Upper Limits
  21. GRB100628A: RTT150 optical observations
  22. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  23. GRB 100628A: Swift detection of a short hard burst
  24. GRB 100614A: CrAO optical limit
  25. GRB 100625A: Swift/UVOT Upper Limits
  26. GRB 100625A : IRSF/SIRIUS NIR upper limit
  27. GRB 100625A: Enhanced Swift-XRT position
  28. GRB100625A : MOA optical upper limit
  29. GRB 100625A: Swift detection of a short hard burst
  30. GRB 100418A: late time optical observations
  31. GRB 100621A: IRSF/SIRIUS NIR Observation
  32. GRB 100621A MOA-II optical limit
  33. GRB 100621A: Swift/UVOT observations
  34. GRB 100621A: GROND observation of bright NIR afterglow
  35. GRB 100621A: Enhanced Swift-XRT position
  36. GRB 100621A: ROTSE-III Optical Limits
  37. GRB 100621A: Swift detection of a burst
  38. GRB 100606A: Optical Limits
  39. GRB 100619A: Swift/UVOT Upper Limits
  40. GRB 100619A: Enhanced Swift-XRT position
  41. GRB 100619A: Swift-BAT refined analysis
  42. GRB 100619A: Swift detection of a burst
  43. GRB 100614A: Gemini/NIRI Observations
  44. GRB 100615A: Gemini/NIRI Observations
  45. GRB 100615A: Swift/UVOT Upper Limits
  46. GRB 100614A: Swift/UVOT Upper Limits
  47. GRB 100614A: NOT optical upper limits
  48. GRB 100614A: MASTER-Net optical alert observations
  49. GRB 100615A: Fermi GBM detection
  50. GRB 100615A: Swift-BAT refined analysis
  51. GRB 100614A: Enhanced Swift-XRT position
  52. GRB 100615A: Enhanced Swift-XRT position
  53. GRB 100615A: GROND observations, upper limits
  54. GRB 100615A: PAIRITEL NIR Upper Limits
  55. GRB 100615A: NTT/Ultracam imaging
  56. GRB 100615A: Swift detection of a burst
  57. GRB 100614A: BOOTES-2/TELMA optical observations
  58. GRB 100614A: Swift detection of a burst
  59. GRB 100606A: GROND observations
  60. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  61. Radio detection of GRB100418a with ATCA
  62. GRB 100606A: Swift/UVOT Upper Limits
  63. GRB 100606A: Enhanced Swift-XRT position
  64. Swift Trigger 424040 is not a GRB
  65. GRB 100606A: Swift detection of a burst
  66. Swift detection of outburst from the SFXT IGR J18410-0535
  67. GRB 100111A: Maidanak optical observations
  68. GRB 100418A: Maidanak optical observations
  69. GRB 100513A: CrAO optical observations
  70. GRB 100514A: CrAO optical observations
  71. GRB 100526A: optical upper limit
  72. GRB 100528A: Faulkes Telescope North Detection
  73. GRB 100528A: GROND detection in all bands
  74. GRB 100528A: NOT optical observation
  75. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  76. GRB100526B: GROND Upper limits
  77. GRB 100526B: Swift-XRT confirmation of fading afterglow
  78. GRB 100526B: Swift/UVOT Upper Limits
  79. GRB 100526A: Swift/UVOT Upper Limits
  80. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  81. GRB 100526A: NOT optical upper limit
  82. GRB 100526B: Swift XRT/UVOT observations
  83. GRB 100526A: Enhanced Swift-XRT position
  84. GRB 100526B: Swift detection of a probable GRB
  85. GRB 100526A: MASTER-Net optical alert observations
  86. GRB 100526A: Swift detection of a burst
  87. GRB100522A: Suzaku WAM observation of the prompt emission
  88. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  89. GRB 100522A: GROND observations, upper limits
  90. Swift/UVOT observations of GRB100522A.
  91. GRB 100522A: Enhanced Swift-XRT position
  92. GRB 100522A: NIR observations from CAHA
  93. GRB 100522A: Swift detection of a burst
  94. GRB 100418A: CrAO optical observations
  95. GRB 100518A: GROND afterglow observation and photo-z
  96. GRB 100518A: Swift/UVOT Upper Limits
  97. GRB 100518A: Swift-XRT refined analysis
  98. GRB 100518A: BOOTES-3 optical observations
  99. Update to the configuration of the Fermi-LAT onboard GRB search
  100. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst

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