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"

27590 results found.

  1. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  2. GRB 130206A: Swift-XRT observations
  3. GRB 130131A: optical observation in Mondy observatory
  4. GRB 130206A: Swift detection of a burst
  5. GRB 130131A: Swift/UVOT Upper Limits
  6. GRB 130131B: RATIR Upper Limits
  7. GRB 130131A: RATIR optical and infrared upper limits
  8. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  9. GRB 130131B: Swift-XRT refined Analysis
  10. GRB 130131B: GROND Upper limits
  11. GRB 130131B: Swift/UVOT Upper Limits
  12. GRB 130131A: Swift-XRT refined Analysis
  13. GRB 130131B: Swift-BAT refined analysis
  14. GRB 130131A: Swift-BAT refined analysis
  15. GRB 130131B: TAROT Calern observatory optical observations
  16. GRB 130131B: Zadko observatory - Gingin optical observations
  17. GRB 130131B: Swift detection of a burst
  18. GRB 130131A - Faulkes Telescope North Observations
  19. GRB 130131A - UKIRT afterglow candidate
  20. GRB 130131A: Swift detection of a burst
  21. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  22. GRB 130127A: Fermi GBM detection
  23. Swift Trigger 547142: MAXI/GSC upper limit
  24. Swift Trigger 547142: a probable Galactic source
  25. GRB 130122A: Swift/UVOT Detection
  26. GRB 130122A: RATIR Detection
  27. GRB 130122A: Swift-BAT refined analysis
  28. GRB 130122A: Swift-XRT refined Analysis
  29. GRB 130122A: Xinglong optical upper limit
  30. GRB 130122A: T100 observations
  31. GRB 130122A: Swift detection of a burst with an optical counterpart
  32. GRB 130102B: MASTER synchronous observations
  33. GRB 130102A: Swift/UVOT Upper Limits
  34. GRB 130102A: P60 Observations
  35. GRB 130102A: Swift-BAT refined analysis
  36. GRB 130102A: Swift-XRT refined Analysis
  37. GRB 130102A: Swift detection of a burst
  38. Swift Trigger 544381 is a noise event
  39. GRB 121229A: Swift-XRT refined Analysis
  40. GRB 121229A, Swift-BAT refined analysis
  41. GRB 121229A: Swift/UVOT Upper Limits
  42. GRB 121229A: VLT/X-shooter redshift
  43. Swift Trigger 544381 is unlikely to be a GRB
  44. GRB 121229A: MAXI/GSC detection
  45. GRB 121229A: GROND detection of the afterglow
  46. GRB 121229A: Swift detection of a burst
  47. GRB 121226A: Swift/UVOT Upper Limits
  48. GRB 121226A: Swift-XRT refined Analysis
  49. GRB 121226A, Swift-BAT refined analysis
  50. GRB 121226A: NOT optical upper limit
  51. GRB 121226A: Optical Observations
  52. GRB 121226A: Zadko observatory - Gingin optical observations
  53. GRB 121226A: BOOTES-4/MET optical observations
  54. GRB 121226A: Swift detection of a burst
  55. IPN Triangulation of GRB 121225B
  56. GRB 121225B: Fermi GBM observation
  57. GRB 121225B: Fermi LAT Detection
  58. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  59. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  60. GRB 121217A: Swift-BAT refined analysis
  61. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  62. GRB 121217A: Fermi GBM observation
  63. GRB 121217A: Swift-XRT refined Analysis
  64. GRB 121217A: Swift/UVOT Detection
  65. GRB 121217A: GROND Detection of the Afterglow
  66. GRB 121217A: Swift detection of a burst
  67. GRB 121209A: Swift/UVOT Upper Limits
  68. GRB 121212A: LOAO IzY Observation
  69. GRB 121209A: MAXI/GSC detection
  70. GRB121212A: NOT optical imaging
  71. GRB 121209A: Early CARMA Observations
  72. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  73. GRB 121211A: Fermi GBM observation
  74. GRB 121211A: RATIR Optical and NIR Observations
  75. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  76. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  77. GRB 121212A: PAIRITEL NIR Observations
  78. GRB 121212A: Swift-XRT refined Analysis
  79. GRB 121212A: P60 Observations
  80. GRB 121212A: optical observations in ISON-NM observatory
  81. GRB121212A: Swift/UVOT Detection
  82. GRB 121212A: Swift-BAT refined analysis
  83. GRB 121211A: Swift-BAT refined analysis
  84. GRB 121212A: Swift detection of a burst
  85. GRB 121211A: Swift/UVOT Detection
  86. GRB 121211A: Swift-XRT refined Analysis
  87. GRB 121211A: Keck/LRIS redshift
  88. GRB 121211A - Faulkes Telescope North afterglow confirmation
  89. GRB 121211A: Swift detection of a burst with an optical counterpart
  90. GRB 121209A: Swift-XRT refined Analysis
  91. GRB 121209A: Swift-BAT refined analysis
  92. GRB121209A: RATIR Optical and NIR Upper Limits
  93. GRB 121209A: GROND optical afterglow candidate
  94. GRB 121209A: Gemini-South imaging
  95. GRB 121209A: PAIRITEL NIR Observations
  96. GRB 121209A: UVOT Observation
  97. GRB 121209A: Swift detection of a burst
  98. GRB 121128A: Optical Observations
  99. GRB 121202A: Swift/UVOT Upper Limits
  100. GRB 121202A: Swift-XRT refined Analysis

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