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"

19608 results found.

  1. GRB 141121A: Swift detection of a burst
  2. IPN Triangulation of GRB 141118A
  3. GRB 141104A: further Swift-XRT observations and afterglow candidate
  4. Swift Trigger 618673: probable noise event
  5. Trigger 618634: Swift detection of Vela X-1
  6. GRB 141109B: optical upper limits
  7. GRB 141015A: TAROT La Silla observatory optical observations
  8. GRB 141022A: TAROT La Silla observatory optical observations
  9. GRB 141031A: TAROT La Silla observatory optical observations
  10. GRB 141109A: TAROT La Silla observatory optical observations
  11. GRB 141109A: AAO optical observations
  12. Swift Trigger 618402: probable noise event
  13. Swift Trigger 618391 is not an astrophysical event
  14. GRB 141109B: Swift/UVOT Upper Limits
  15. GRB 141109A: Swift/UVOT Detection
  16. Konus-Wind observation of GRB 141109A
  17. GRB 141109B: IRAM 30m millimetre observations
  18. GRB 141109B: Swift-XRT refined Analysis
  19. Swift Trigger 618134 is not an astrophysical event
  20. GRB 141109A: Swift-XRT refined Analysis
  21. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  22. GRB 141109B: Swift-BAT refined analysis
  23. GRB 141109B: Enhanced Swift-XRT position
  24. GRB 141109A: Swift-BAT refined analysis
  25. GRB 141109A: Enhanced Swift-XRT position
  26. GRB 141109A: GROND afterglow observation
  27. X-shooter redshift of GRB 141109A
  28. GRB 141109B: Swift detection of a burst
  29. GRB 141109A: Swift detection of a burst
  30. GRB 141104A: Swift-XRT observations
  31. GRB 141104A Tiled Swift observations
  32. GRB 141026A: CrAO optical observation
  33. GRB
  34. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  35. IPN Triangulation of GRB 141104A (long/very bright)
  36. GRB 141102A possible precursor was another, known source
  37. Konus-Wind observation of GRB 141102A
  38. GRB 141022A: Skynet PROMPT-CTIO Observations
  39. GRB 141102A: Fermi-LAT detection
  40. GRB 141102A: Fermi GBM detection
  41. GRB 141102A found in ground analysis of BAT data
  42. GRB 141031B: RATIR Optical and NIR Observation
  43. GRB 141031B: Swift/UVOT Upper Limits
  44. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  45. GRB 141031B: Swift-XRT refined Analysis
  46. GRB 141031B: Bassano Bresciano Observatory upper limit
  47. GRB 141031B: Swift-BAT refined analysis
  48. GRB 141031A, Swift-BAT refined analysis
  49. GRB 141031B: Enhanced Swift-XRT position
  50. GRB 141031A: Swift/UVOT Upper Limits
  51. GRB 141031A: Swift-XRT refined Analysis
  52. GRB 141031A: Skynet PROMPT-CTIO Observations
  53. GRB 141031A: Fermi GBM detection
  54. GRB 141031B: MASTER early optical observations
  55. GRB 141031B: Swift detection of a burst
  56. GRB 141031A: Enhanced Swift-XRT position
  57. GRB 141031A: GROND detection of a possible optical afterglow candidate
  58. GRB 141031A: Swift detection of a burst
  59. GRB 140509A: GROND afterglow detection
  60. GRB 141028A: Swift/UVOT followup observations
  61. GRB 141028A: Swift-XRT observations
  62. GRB 141029A Tiled Swift observations
  63. GRB 141028A: Swift/UVOT Detection
  64. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  65. GRB 141020A: Continued Mondy Observations, optical upper limit
  66. GRB 141026A: IRAM 30m millimetre observations
  67. GRB 141028A Tiled Swift observations
  68. GRB 141026A: Continued RATIR Optical and NIR Observations
  69. GRB 141028A: Fermi-LAT detection
  70. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  71. GRB 141026A: Swift/UVOT Upper Limits
  72. GRB 141026A: Swift-XRT refined Analysis
  73. GRB 141026A: Swift-BAT refined analysis
  74. GRB 141026A: MASTER early optical observations
  75. GRB 141026A: Enhanced Swift-XRT position
  76. GRB 141026A: GROND observations
  77. GRB 141026A: RATIR Optical Observations
  78. GRB 141026A: P60 early observations
  79. GRB 141026A: Swift detection of a burst
  80. GRB 141020A: AAO optical upper limit
  81. GRB 141020A: Khureltogot optical upper limit
  82. GRB141022A: Fermi GBM Detection
  83. GRB 141022A: Swift/UVOT Upper Limits
  84. GRB 141020A: Mondy optical observations
  85. GRB 141022A: Swift-BAT refined analysis
  86. GRB 141022A: Swift-XRT refined Analysis
  87. GRB141015A iTelescope observation
  88. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  89. GRB 141022A: Swift detection of a burst
  90. GRB 141004A: RATIR Late Time Optical and NIR Observations
  91. GRB 141020A: Swift-BAT refined analysis
  92. GRB 141020A: Swift-XRT refined Analysis
  93. GRB 141020A: 1.4 GHZ observation
  94. GRB 141020A: Swift/UVOT Detection
  95. GRB 141020A: Enhanced Swift-XRT position
  96. GRB 141020B: MAXI/GSC detection
  97. Konus-Wind observation of GRB 141017A
  98. GRB 141020A: Swift detection of a burst with an optical counterpart
  99. GRB 141017A, Swift-BAT refined analysis
  100. GRB 141017A: GROND Afterglow Confirmation

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