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"

28939 results found.

  1. Swift detection of an RS CVn flare star
  2. Swift Trigger 172767 is not a GRB
  3. GRB 051215: near-infrared observations
  4. GRB 051215: Swift detection of a possible burst
  5. GRB 051215: A short GRB in a cluster?
  6. GRB 051213: Swift-BAT refined analysis
  7. GRB051211B: XRT refined analysis
  8. GRB 051213: Swift-BAT detection of a burst
  9. GRB 051211A: Swift/UVOT upper limits
  10. GRB 051211B: Swift/UVOT upper limits
  11. GRB051211B: Liverpool Telescope observation
  12. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  13. GRB 051210: Swift/UVOT upper limits
  14. HETE SXC localization of GRB 051211 (=H3979)
  15. GRB 051210: Swift XRT refined analysis
  16. GRB 051210: Swift-BAT refined analysis of a short burst
  17. GRB051210: Swift UVOT Observation
  18. GRB 051210: Swift detection of a burst
  19. Possible resuming of the SGR 1806-20 activity
  20. Swift-BAT trigger 165579 is not a GRB
  21. GRB 051127: Swift-BAT detection of a possible burst
  22. GRB051117b: No Swift/UVOT Detection
  23. GRB 051117A: Swift/UVOT Detection of an Afterglow
  24. GRB051111: Rc optical observations
  25. GRB051008: Suzaku WAM observation of the prompt emission
  26. GRB 051021 Optical Observations
  27. GRB 051117B: MARGE Optical Limits
  28. GRB 051117A: Refined analysis of the Swift-BAT burst
  29. GRB 051117B: Refined analysis of the Swift-BAT burst
  30. GRB051117A : XRT refined analysis
  31. GRB 051117B,optical observation
  32. GRB 051117B: ROTSE-III Optical Limits
  33. GRB 051117B: Swift detection of a burst
  34. GRB 051117: Swift detection of a bright burst
  35. GRB051114: results of the Swift-XRT observation
  36. GRB 051028 Optical Observations
  37. GRB 051114: Swift-BAT refined analysis
  38. GRB 051114: Swift-BAT detection of a short burst
  39. GRB 051113: Swift-BAT refined analysis
  40. GRB 051113: Swift-BAT detection of a burst
  41. GRB 051111: AEOS optical observations
  42. GRB051111: Swift/UVOT Observations
  43. GRB 051111: Swift-BAT refined analysis
  44. GRB 051109A Optical Observations
  45. GRB051111a: SARA Observations
  46. GRB 051111A: KAIT optical observations
  47. GRB051111: Super-LOTIS Early Detection
  48. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  49. Faulkes Telescope R-band detection of GRB051111
  50. GRB051111: Swift-BAT detection of a bright burst
  51. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  52. GRB 051105a: GETS optical limit
  53. GRB 051109b: GETS observation
  54. Early RAPTOR measurements of GRB 051109a - the movie.
  55. Konus-Wind observation of GRB 051109A
  56. GRB 051109B: Swift-BAT refined analysis
  57. GRB 051109B: ROTSE-III Optical Limits
  58. GRB 051109A: Swift-UVOT Observations
  59. GRB051109B: no UVOT source detected
  60. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  61. GRB051109B: XRT position
  62. GRB 051109B: Super-LOTIS Observations
  63. GRB 051109B Kiso optical follow-up observation
  64. GRB 051109B: Swift detection of a burst
  65. GRB 051109: HET Optical Spectrum and Absorption Redshift
  66. GRB051109: Early Super-LOTIS Detection
  67. GRB 051109: Swift-BAT refined analysis
  68. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  69. GRB051109: Swift detection of a burst
  70. GRB 051109a: IR Detections
  71. GRB 051109: ROTSE-III Detection of Possible Counterpart
  72. GRB051105B: Swift/XRT upper limit
  73. GRB051105B: Swift/UVOT upper limit
  74. GRB051103: optical observations
  75. GRB051028: Swift-XRT refined analysis
  76. GRB051105A: Swift/UVOT Observations
  77. XRT observations of GRB 051105A
  78. GRB 051105b: ART optical limits
  79. GRB 051105B (INTEGRAL 2701): Optical observation
  80. GRB 051105: Swift-BAT refined analysis
  81. GRB 051105: Swift detection of a short burst
  82. Konus-Wind observation of GRB 051028
  83. GRB051028 SARA Observation
  84. GRB051028: optical observations
  85. GRB051028: Swift/UVOT upper limits
  86. GRB051028: WHT optical candidate
  87. GRB051028: Swift XRT Position
  88. GRB051021B: Swift/UVOT Upper limits
  89. GRB 051021, Optical Observations
  90. GRB051012: Swift-XRT analysis
  91. GRB051021B: Swift XRT refined analysis
  92. GRB 051022: Swift/UVOT Upper Limits
  93. Konus-Wind observation of GRB 051022
  94. GRB051022: Swift XRT Position
  95. GRB 051022 (=H3950): SXC Flight Localization is Valid
  96. GRB051021: Swift/UVOT Upper Limits
  97. GRB 051021B: Refined analysis of the Swift-BAT burst
  98. GRB051022,optical observation
  99. GRB 051022A: ROTSE-III Optical Limits
  100. GRB 051022: Optical 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