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"

28123 results found.

  1. GRB100906A: detection at 15GHz
  2. GRB100901A: IAO optical upper limits at 4 days after the burst
  3. GRB100906A: R band observations
  4. GRB100906A: non-detection at 15GHz
  5. GRB100906A: Optical observations at IAO
  6. GRB 100906A: Fermi GBM observation
  7. GRB 100906A: Swift-XRT refined analysis
  8. GRB 100906A: Enhanced Swift-XRT position
  9. GRB 100906A: Swift/UVOT Observations
  10. GRB100906A: MITSuME Okayama Optical Observation
  11. GRB 100905A: Swift/UVOT Upper Limits
  12. GRB 100901A: TLS observations, SDSS calibration, decay slope
  13. GRB 100906A: MASTER preliminary prompt+afterglow lc
  14. GRB 100906A: Swift-BAT refined analysis
  15. GRB 100906A: Swift detection of a burst with an optical afterglow
  16. GRB 100829A: MASTER optical observations
  17. GRB100905A: Optical upper limits at IAO
  18. GRB100905A: MITSuME Okayama optical upper limits
  19. GRB 100905A: Swift-XRT refined analysis.
  20. GRB100905A: 1.5m OSN upper limit
  21. GRB 100905A: Enhanced Swift-XRT position
  22. GRB 100905A: Swift-BAT refined analysis
  23. GRB 100905A: Faulkes Telescope North observations
  24. GRB 100905A: Swift detection of a burst
  25. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  26. GRB 100901A: Submm observations from SMA
  27. GRB 100904A: Swift-BAT refined analysis
  28. GRB100902A: Optical upper limits at IAO
  29. GRB10901A: Optical observations at IAO
  30. GRB 100902A: Swift-BAT refined analysis
  31. IPN Triangulation of the very bright GRB 100829A
  32. GRB 100902A: Swift XRT refined analysis
  33. GRB 100902A: Swift/UVOT Upper Limits
  34. GRB 100902A: optical observation at Mt.Terskol
  35. GRB 100901A: optical observation at Mt.Terskol
  36. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  37. GRB 100902A: Enhanced Swift-XRT position
  38. GRB 100901A: TLS Observations: Break?
  39. GRB 100901A: ISON-NM optical observations
  40. GRB 100902A: Faulkes Telescope South observations
  41. GRB 100902A: Swift detection of a burst
  42. GRB 100901A: Vega telescope optical afterglow observation
  43. Swift/UVOT Observations of GRB100901A
  44. GRB 100901A: SARA-N observations
  45. GRB 100901A: THO optical observations
  46. GRB100901A: MITSuME Okayama Optical Observation
  47. GRB 100901A: Swift-XRT Team refined analysis
  48. GRB 100901A - NOT optical observation
  49. GRB 100901A: Swift-BAT refined analysis
  50. GRB 100901A: Enhanced Swift-XRT position
  51. GRB 100901A: Swift detection of a burst with an optical afterglow
  52. GRB 100829.9: MASTER Optical Limits
  53. GRB 100823A: optical upper limit
  54. GRB 100814A: Maidanak optical observations
  55. GRB 100823A: optical observations
  56. GRB 100725B: Mondy optical upper limit
  57. GRB 100725B: Maidanak optical upper limit
  58. GRB100807A: R band observations
  59. GRB 100823A: Swift XRT refined analysis
  60. GRB 100823A - second epoch WHT observations
  61. GRB 100823A: TNG NIR observations
  62. GRB 100823A: Swift/UVOT Upper Limits
  63. GRB 100823A: WHT observations
  64. GRB 100823A: Swift-BAT refined analysis
  65. GRB 100823A: Enhanced Swift-XRT position
  66. GRB 100823A: Swift detection of a burst
  67. GRB 100814A: Suzaku WAM observation of the prompt emission
  68. GRB 100814B: Fermi GBM detection
  69. GRB 100814A: optical observations
  70. GRB100816A: MITSuME optical upper limits
  71. GRB 100814A: NOT optical observations
  72. GRB 100816A: NOT optical observations
  73. GRB 100814A : Lulin optical observation
  74. GRB 100816A : Lulin r'-band observation
  75. GRB 100816A: Swift UVOT Observations
  76. GRB100816A Swift-XRT refined analysis
  77. GRB 100816A: Swift-BAT spectral lag results
  78. GRB 100816A: 1.23m CAHA optical observations
  79. GRB 100816A, Swift-BAT refined analysis
  80. GRB 100816A: Enhanced Swift-XRT position
  81. GRB 100816A: Gemini-N imaging
  82. GRB 100816A: TAROT Calern observatory optical detection
  83. GRB 100816A: MASTER Optical Limits
  84. GRB100816A: TNG optical afterglow confirmation.
  85. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  86. GRB 100814A: Fermi GBM observation
  87. GRB 100814A: Submm observations from APEX
  88. GRB 100814A: Swift-XRT refined analysis
  89. Swift/UVOT observations of GRB100814A
  90. GRB 100814A, Swift-BAT refined analysis
  91. GRB 100814A: Enhanced Swift-XRT position
  92. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  93. GRB 100814A: Swift UVOT observations of the optical afterglow
  94. GRB 100814A: Swift detection of a burst with an optical afterglow
  95. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  96. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  97. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  98. GRB 100802A: further NOT observation
  99. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  100. GRB 100807A: P200 Infrared Observations

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