Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"
  1. GRB 140108A: Mondy optical observations, refined analysis
  2. GRB 140114A: NOT afterglow observations
  3. GRB 140114A: Continued RATIR Optical and NIR Observations
  4. GRB 140114A: MITSuME Okayama upper limits
  5. GRB 140114A: ROTSE-III Optical Limits
  6. GRB 140114A: Swift-XRT refined Analysis
  7. GRB 140114A: Swift-BAT refined analysis
  8. GRB 140114A: Swift/UVOT Upper Limits
  9. GRB 140114A: KAIT Optical Upper Limit
  10. GRB 140103A: AAO optical afterglow candidate
  11. GRB 140104B: Further Swift XRT observations
  12. GRB 140114A: Enhanced Swift-XRT position
  13. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  14. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  15. GRB 140102A: AAO optical upper limits
  16. GRB 140114A: P60 Observations
  17. GRB 140114A: Swift detection of a burst
  18. GRB 140108A: Konkoly optical observations
  19. GRB 140110A: Swift/UVOT retraction of UVOT candidates
  20. IPN Triangulation of GRB 140110A
  21. GRB 140110A: Swift/UVOT Observations
  22. GRB 140108A: Suzaku WAM observation of the prompt emission
  23. GRB 140104B: Suzaku WAM observation of the prompt emission
  24. GRB 140110A: Swift XRT observations
  25. GRB 140110A: Reported UVOT OT not GRB afterglow
  26. GRB 140110A: OT detection in Swift/UVOT imaging
  27. GRB 140108A BAT refined analysis update *CORRECTION*
  28. GRB 140108A BAT refined analysis update
  29. GRB 140110A: Fermi GBM observation
  30. GRB 140110A Tiled Swift observations
  31. GRB 140110A: Fermi-LAT detection of a burst
  32. GRB 140108A: Mondy optical upper limit
  33. GRB 140105A: MASTER-Net early optical observations and time correction
  34. GRB 131231A: AAO optical observations
  35. GRB 140108A: Swift-BAT refined analysis
  36. GRB 140108A: Fermi GBM detection
  37. GRB 140108A: Swift/UVOT Detection
  38. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  39. GRB 140108A: Swift-XRT refined Analysis
  40. GRB 140108A: Enhanced Swift-XRT position
  41. GRB 140108A: Mondy optical observations
  42. GRB 140108A: D50+BART optical candidate detection
  43. GRB 140108A: 1.23m CAHA observations
  44. GRB 140108A: MASTER-Net OT detection
  45. GRB 140108A: Prompt enhanced Swift-XRT position
  46. GRB 140108A: Swift detection of a burst
  47. New Fermi-LAT GRB Table
  48. GRB 140105A: HCT Observations
  49. GRB 140105A: continued iPTF observations and rejection of optical candidates
  50. Swift-BAT triggered on KS 1947+300
  51. GRB 140105A: Swift XRT observations
  52. GRB 140103A: Swift XRT afterglow confirmation
  53. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  54. GRB 140104B: Swift XRT observations
  55. GRB 140102A: Swift/UVOT Detection
  56. LOAO R-band Observation of GRB 140102A
  57. GRB 140105A: Fermi GBM detection
  58. GRB 140104B: Fermi GBM observation
  59. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  60. GRB 140102A: BOOTES-4 early optical observations
  61. GRB 140104B: Fermi-LAT detection of a burst
  62. GRB 131209A: Further Swift XRT observations
  63. GRB 140103A: Lulin Optical r-band Observations
  64. GRB 131231A : Lulin Optical Observations
  65. GRB 131231A: CARMA 3mm detection
  66. Swift-BAT trigger 582894 is HR 1099 (Flare star)
  67. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  68. GRB 140102A, Optical Observations
  69. GRB 131231A, Optical Observations
  70. GRB 140103A: P60 Observations
  71. GRB 140102A: P60 observations
  72. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  73. GRB 131231A: Fermi GBM correction to GCN 15644
  74. GRB 140103A: Swift/UVOT Upper Limits
  75. Konus-Wind observation of GRB 131231A
  76. GRB 140102A: Fermi/GBM Observation
  77. GRB 131229A: Suzaku WAM observation of the prompt emission
  78. Konus-Wind observation of GRB 140102A
  79. GRB 140103A: Swift-XRT refined analysis
  80. GRB 140102A: GROND observations
  81. GRB 140103A, Swift-BAT refined analysis
  82. GRB 140102A: MAXI/GSC detection
  83. GRB 140102A, Swift-BAT refined analysis
  84. GRB 140102A: Swift-XRT refined Analysis
  85. GRB 140103A: MASTER-Net optical observations
  86. GRB 140102A: Fermi-LAT detection of a burst
  87. GRB 140102A: I-band observations from IAC80 and 1.23m CAHA telescopes
  88. GRB 140102A: Enhanced Swift-XRT position
  89. GRB 140103A: Swift detection of a burst
  90. GRB 140102A: Early optical observations from Nanshan
  91. GRB 131224B detected in ground analysis of Swift-BAT data
  92. GRB 140102A: Swift detection of a burst with optical counterpart
  93. GRB 131231A: Gemini-South Redshift
  94. GRB 131229A: Fermi GBM detection
  95. GRB 131231A: P60 observations
  96. GRB 131227A: KAIT light curve analysis
  97. GRB 131231A: Swift-XRT observations
  98. GRB 131231A : xinglong TNT optical observation
  99. GRB 131231A: MDM afterglow observation
  100. GRB 131231A: VLT/X-shooter redshift

Advanced

Download all Circulars as a .tar.gz archive:
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