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"

19643 results found.

  1. GRB 100915A: TAROT Calern observatory optical observations
  2. GRB100906A: Ashra-1 observation of early optical emission
  3. GRB 100917A: Swift-BAT refined analysis
  4. GRB 100917A: Swift detection of a burst
  5. GRB 100915A: GRT Optical Observation
  6. GRB 100915A: Correction to Swift-BAT refined analysis
  7. GRB 100915A: Swift/UVOT Upper Limits
  8. GRB 100915A: Swift-BAT refined analysis
  9. GRB 100915A: Swift-XRT refined analysis
  10. GRB 100915A: Enhanced Swift-XRT position
  11. GRB 100915A: Swift detection of a likely burst
  12. Swift-BAT trigger 433953 is not a burst
  13. Swift BAT Trigger 433953 probably not a GRB
  14. GRB 100909A: Swift/UVOT observations
  15. GRB 100901A: optical observations in Mondy and R-light curve
  16. GRB 100909A: Swift-XRT refined analysis
  17. GRB 100906A: optical observations at Mt.Terskol
  18. GRB 100901A: optical observation in Maidanak, break confirmation
  19. GRB 100909A: Faulkes Telescope North afterglow candidate
  20. GRB 100909A: ROTSE-III Optical Limits
  21. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  22. GRB 100909A: Swift target of opportunity observation
  23. EVLA detection of radio afterglow of GRB100901A
  24. GRB 100901A: CrAO optical observations
  25. GRB100906A: R band observations
  26. Konus-Wind observation of GRB 100906A
  27. GRB 100906A: Fermi GBM observation
  28. GRB 100901A: TLS Detection at 5.5 days
  29. GRB 100906A: Swift-XRT refined analysis
  30. GRB 100906A: Enhanced Swift-XRT position
  31. GRB 100906A: Swift/UVOT Observations
  32. GRB 100906A: TLS Multicolor Observations
  33. GRB 100905A: Swift/UVOT Upper Limits
  34. GRB 100901A: ISON-NM optical observations
  35. GRB 100906A: Swift-BAT refined analysis
  36. GRB 100906A: MASTER preliminary polarization prompt light curve
  37. GRB 100906A : Faulkes Telescope North optical observations
  38. GRB 100906A: MASTER early OT observations
  39. GRB 100906A: Swift detection of a burst with an optical afterglow
  40. GRB 100905A: Swift-XRT refined analysis.
  41. GRB 100905A: Enhanced Swift-XRT position
  42. GRB 100905A: Swift-BAT refined analysis
  43. GRB100904A: BOOTES-3 Upper Limit
  44. GRB 100905A: MASTER Prompt Optical Observations
  45. GRB 100905A: Faulkes Telescope North observations
  46. GRB 100905A: Swift detection of a burst
  47. GRB 100904A: Swift-BAT refined analysis
  48. GRB 100904A: Swift detection of a burst
  49. GRB 100902A: Swift-BAT refined analysis
  50. GRB 100901A: optical observation at Mt.Terskol
  51. GRB 100901A: multicolor photometry at Mt.Terskol
  52. IPN Triangulation of the very bright GRB 100829A
  53. GRB 100901A: Lightbuckets Optical Observations
  54. GRB 100902A: 1.5m OSN I-band Upper Limits
  55. Tentative redshift of GRB100902A from Swift-XRT data
  56. GRB 100902A: Swift XRT refined analysis
  57. GRB 100902A: Swift/UVOT Upper Limits
  58. GRB 100902A: optical observation at Mt.Terskol
  59. GRB 100901A: optical observation at Mt.Terskol
  60. GRB 100902A: Enhanced Swift-XRT position
  61. GRB 100901A: TLS Observations: Break?
  62. GRB 100902A: MASTER Prompt Optical Observations
  63. GRB 100901A: ISON-NM optical observations
  64. GRB 100902A: MASTER Optical Early Limit
  65. GRB 100902A: Swift detection of a burst
  66. GRB 100901A: 1.5m OSN BVRI-band observations.
  67. GRB 100901A: ROTSE-III Detection
  68. Swift/UVOT Observations of GRB100901A
  69. GRB 100901A: Swift-XRT Team refined analysis
  70. GRB 100901A: Swift-BAT refined analysis
  71. GRB 100901A: optical observation at Mt.Terskol
  72. GRB 100901A: Enhanced Swift-XRT position
  73. GRB 100901A: optical observation at Mt.Terskol
  74. GRB 100901A: MASTER power low decay
  75. GRB 100901A: MASTER: the OT brightenning
  76. GRB 100901A: confirmation of the afterglow
  77. GRB 100901A: MASTER Optical Early Limits
  78. GRB 100901A: Faulkes Telescope North afterglow candidate
  79. GRB 100901A: Swift detection of a burst with an optical afterglow
  80. GRB 100823A: optical upper limit
  81. GRB 100814A: Maidanak optical observations
  82. GRB 100823A: optical observations
  83. GRB 100823A: MAXI/GSC detection
  84. GRB 100725B: Mondy optical upper limit
  85. GRB 100725B: Maidanak optical upper limit
  86. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  87. GRB100807A: R band observations
  88. GRB100823A : MOA optical observation
  89. GRB 100823A: Swift XRT refined analysis
  90. GRB 100823: 1.5m OSN I-band observations
  91. GRB 100823A: Swift/UVOT Upper Limits
  92. GRB 100823A: Swift-BAT refined analysis
  93. GRB 100823A: Enhanced Swift-XRT position
  94. GRB 100823A: Swift detection of a burst
  95. GRB 100814A: Suzaku WAM observation of the prompt emission
  96. GRB 100814A: ISON-NM optical observations
  97. EVLA radio afterglow detection of GRB 100814A
  98. GRB 100814A: optical observations
  99. Konus-Wind observation of GRB 100816A
  100. GRB 100816A: Fermi GBM observation

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