Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27393 results found.

  1. GRB 140209A: Early RAPTOR Optical Detection
  2. GRB 140209A: Swift-BAT Spectral lag analysis
  3. GRB 140206A: Bassano Bresciano Observatory optical upper limit
  4. GRB 140209A, Swift-BAT refined analysis
  5. GRB 140209A: Fermi GBM observation
  6. GRB 140209A: optical observations
  7. GRB 140209A: P60 optical afterglow detection
  8. GRB 140209A: Swift detection of a burst
  9. GRB 140206A: Liverpool Telescope optical afterglow observations
  10. GRB 140206A, Swift-BAT refined analysis
  11. GRB 140206A: Swift-XRT refined Analysis
  12. GRB 140206A: T100 observations
  13. GRB 140206A: Fermi GBM detection
  14. GRB 140206A: Swift/UVOT Detection
  15. GRB 140206A: theoretical prediction of redshift and of supernova occurrence
  16. GRB 140206A: ISON-Ussuriysk optical observations
  17. GRB 140206B: Fermi-LAT detection
  18. GRB 140206B: Fermi GBM detection
  19. GRB 140206A: MASTER OT detection
  20. GRB 140206A: Swift/UVOT optical detection
  21. GRB 140206A: Swift detection of a burst
  22. GRB 140129A: Continued RATIR Optical and NIR Observations
  23. GRB 140129B: Swift/UVOT Detection
  24. GRB 140129A: Continued RATIR Optical and NIR Observations
  25. GRB 140129B: Swift-XRT refined Analysis
  26. GRB 140129B: MASTER OT early light curve
  27. GRB 140129A: CARMA early observations
  28. GRB 140129B, Swift-BAT refined analysis (probably not a short burst)
  29. GRB 140129A: P200 spectroscopy
  30. GRB140129A: RAPTOR Observations of the Early Afterglow
  31. GRB 140129A, Swift-BAT refined analysis
  32. GRB 140129A: Swift/UVOT Observations
  33. GRB 140129A: Swift-XRT refined Analysis
  34. GRB 140129B: MASTER OT confirmation
  35. GRB 140129B: Swift detection of a burst with an optical afterglow
  36. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  37. GRB 140129A: RATIR Optical and NIR Observations
  38. GRB 140129A: P60 optical afterglow detection
  39. GRB 140129A: Swift detection of a burst with an optical afterglow
  40. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  41. Fermi412093190: iPTF optical counterpart search
  42. GRB 140110A: Second Follow-up Swift-XRT Observation
  43. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  44. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  45. GRB 140118A: RATIR Optical and NIR Observations
  46. GRB 140118A: Fermi GBM observation
  47. GRB 140118A, Swift-BAT refined analysis
  48. Swift Trigger 584155 is MAXI J1421-613
  49. GRB 140118A: Swift detection of a burst
  50. GRB 140110A: Further Swift-XRT Observation
  51. GRB 140103A: MASTER-Net early OT detection
  52. GRB 140103A: optical upper limit
  53. GRB 140108A: Mondy optical observations, refined analysis
  54. GRB 140114A: Continued RATIR Optical and NIR Observations
  55. GRB 140114A: ROTSE-III Optical Limits
  56. GRB 140114A: Swift-XRT refined Analysis
  57. GRB 140114A: Swift-BAT refined analysis
  58. GRB 140114A: Swift/UVOT Upper Limits
  59. GRB 140104B: Further Swift XRT observations
  60. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  61. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  62. GRB 140114A: P60 Observations
  63. GRB 140114A: Swift detection of a burst
  64. IPN Triangulation of GRB 140110A
  65. GRB 140110A: Swift/UVOT Observations
  66. GRB 140108A: Suzaku WAM observation of the prompt emission
  67. GRB 140110A: Swift XRT observations
  68. GRB 140108A BAT refined analysis update *CORRECTION*
  69. GRB 140108A BAT refined analysis update
  70. GRB 140110A: Fermi GBM observation
  71. GRB 140110A: Fermi-LAT detection of a burst
  72. GRB 140105A: MASTER-Net early optical observations and time correction
  73. GRB 140108A: Swift-BAT refined analysis
  74. GRB 140108A: Fermi GBM detection
  75. GRB 140108A: Swift/UVOT Detection
  76. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  77. GRB 140108A: Swift-XRT refined Analysis
  78. GRB 140108A: Mondy optical observations
  79. GRB 140108A: D50+BART optical candidate detection
  80. GRB 140108A: MASTER-Net OT detection
  81. GRB 140108A: Swift detection of a burst
  82. New Fermi-LAT GRB Table
  83. Swift-BAT triggered on KS 1947+300
  84. GRB 140103A: Swift XRT afterglow confirmation
  85. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  86. GRB 140104B: Swift XRT observations
  87. GRB 140102A: Swift/UVOT Detection
  88. LOAO R-band Observation of GRB 140102A
  89. GRB 140105A: Fermi GBM detection
  90. GRB 140104B: Fermi GBM observation
  91. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  92. GRB 140102A: BOOTES-4 early optical observations
  93. GRB 140104B: Fermi-LAT detection of a burst
  94. GRB 140103A: Lulin Optical r-band Observations
  95. Swift-BAT trigger 582894 is HR 1099 (Flare star)
  96. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  97. GRB 140102A, Optical Observations
  98. GRB 140103A: P60 Observations
  99. GRB 140102A: P60 observations
  100. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow

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