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"

28099 results found.

  1. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  2. GRB 100901A: Submm observations from SMA
  3. GRB 100904A: Swift-BAT refined analysis
  4. GRB100902A: Optical upper limits at IAO
  5. GRB10901A: Optical observations at IAO
  6. GRB 100902A: Swift-BAT refined analysis
  7. IPN Triangulation of the very bright GRB 100829A
  8. GRB 100902A: Swift XRT refined analysis
  9. GRB 100902A: Swift/UVOT Upper Limits
  10. GRB 100902A: optical observation at Mt.Terskol
  11. GRB 100901A: optical observation at Mt.Terskol
  12. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  13. GRB 100902A: Enhanced Swift-XRT position
  14. GRB 100901A: TLS Observations: Break?
  15. GRB 100901A: ISON-NM optical observations
  16. GRB 100902A: Faulkes Telescope South observations
  17. GRB 100902A: Swift detection of a burst
  18. GRB 100901A: Vega telescope optical afterglow observation
  19. Swift/UVOT Observations of GRB100901A
  20. GRB 100901A: SARA-N observations
  21. GRB 100901A: THO optical observations
  22. GRB100901A: MITSuME Okayama Optical Observation
  23. GRB 100901A: Swift-XRT Team refined analysis
  24. GRB 100901A - NOT optical observation
  25. GRB 100901A: Swift-BAT refined analysis
  26. GRB 100901A: Enhanced Swift-XRT position
  27. GRB 100901A: Swift detection of a burst with an optical afterglow
  28. GRB 100829.9: MASTER Optical Limits
  29. GRB 100823A: optical upper limit
  30. GRB 100814A: Maidanak optical observations
  31. GRB 100823A: optical observations
  32. GRB 100725B: Mondy optical upper limit
  33. GRB 100725B: Maidanak optical upper limit
  34. GRB100807A: R band observations
  35. GRB 100823A: Swift XRT refined analysis
  36. GRB 100823A - second epoch WHT observations
  37. GRB 100823A: TNG NIR observations
  38. GRB 100823A: Swift/UVOT Upper Limits
  39. GRB 100823A: WHT observations
  40. GRB 100823A: Swift-BAT refined analysis
  41. GRB 100823A: Enhanced Swift-XRT position
  42. GRB 100823A: Swift detection of a burst
  43. GRB 100814A: Suzaku WAM observation of the prompt emission
  44. GRB 100814B: Fermi GBM detection
  45. GRB 100814A: optical observations
  46. GRB100816A: MITSuME optical upper limits
  47. GRB 100814A: NOT optical observations
  48. GRB 100816A: NOT optical observations
  49. GRB 100814A : Lulin optical observation
  50. GRB 100816A : Lulin r'-band observation
  51. GRB 100816A: Swift UVOT Observations
  52. GRB100816A Swift-XRT refined analysis
  53. GRB 100816A: Swift-BAT spectral lag results
  54. GRB 100816A: 1.23m CAHA optical observations
  55. GRB 100816A, Swift-BAT refined analysis
  56. GRB 100816A: Enhanced Swift-XRT position
  57. GRB 100816A: Gemini-N imaging
  58. GRB 100816A: TAROT Calern observatory optical detection
  59. GRB 100816A: MASTER Optical Limits
  60. GRB100816A: TNG optical afterglow confirmation.
  61. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  62. GRB 100814A: Fermi GBM observation
  63. GRB 100814A: Submm observations from APEX
  64. GRB 100814A: Swift-XRT refined analysis
  65. Swift/UVOT observations of GRB100814A
  66. GRB 100814A, Swift-BAT refined analysis
  67. GRB 100814A: Enhanced Swift-XRT position
  68. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  69. GRB 100814A: Swift UVOT observations of the optical afterglow
  70. GRB 100814A: Swift detection of a burst with an optical afterglow
  71. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  72. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  73. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  74. GRB 100802A: further NOT observation
  75. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  76. GRB 100807A: P200 Infrared Observations
  77. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  78. GRB100807A: optical observation in CrAO
  79. GRB 100805A: optical observation in CrAO
  80. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  81. GRB100807A: MITSuME optical upper limits
  82. GRB 100807A: Swift XRT refined analysis
  83. GRB 100807A: P60 Optical Afterglow Discovery
  84. GRB 100807A: Swift/UVOT Upper Limits
  85. GRB 100805A: SAO RAS optical observations
  86. GRB 100807A: Enhanced Swift-XRT position
  87. GRB 100807A: Swift-BAT refined analysis
  88. GRB 100807A: Swift detection of a burst
  89. GRB 100805A: IAC80 and 1.5m OSN optical observations
  90. GRB 100805A: Early RAPTOR Observations
  91. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  92. GRB 100802A: WIYN observations
  93. GRB 100805A: IAC80 BVR-band observations
  94. GRB 100805A: Swift-BAT refined analysis
  95. GRB 100805A: Swift-XRT Refined Analysis
  96. GRB 100805A: GRAS 002 optical observations
  97. Trigger 430975: Swift detection of a possible burst
  98. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  99. GRB 100805A: Enhanced Swift-XRT position
  100. GRB 100805A: Further P60 Monitoring

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