Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

45790 results found.

  1. GRB140129A: RAPTOR Observations of the Early Afterglow
  2. GRB 140129A: MITSuME Okayama upper limits
  3. GRB 140129B: Enhanced Swift-XRT position
  4. GRB 140129A, Swift-BAT refined analysis
  5. GRB 140129A: Swift/UVOT Observations
  6. GRB 140129A: Swift-XRT refined Analysis
  7. GRB 140129B: MASTER OT confirmation
  8. GRB 140129B: Swift detection of a burst with an optical afterglow
  9. GRB 140129A: Enhanced Swift-XRT position
  10. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  11. GRB 140129A: RATIR Optical and NIR Observations
  12. GRB 140129A: P60 optical afterglow detection
  13. GRB 140129A: Swift detection of a burst with an optical afterglow
  14. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  15. Fermi412093190: iPTF optical counterpart search
  16. GRB 140110A: Second Follow-up Swift-XRT Observation
  17. GRB 140114A: optical upper limit
  18. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  19. Konus-Wind observation of GRB 131215A
  20. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  21. GRB 140118A: RATIR Optical and NIR Observations
  22. GRB 140118A: Fermi GBM observation
  23. GRB 140118A, Swift-BAT refined analysis
  24. Swift Trigger 584155 is MAXI J1421-613
  25. GRB 140118A: Swift detection of a burst
  26. GRB 140110A: Further Swift-XRT Observation
  27. GRB 140103A: MASTER-Net early OT detection
  28. GRB 140103A: optical upper limit
  29. GRB 140108A: Mondy optical observations, refined analysis
  30. GRB 140114A: NOT afterglow observations
  31. GRB 140114A: Continued RATIR Optical and NIR Observations
  32. GRB 140114A: MITSuME Okayama upper limits
  33. GRB 140114A: ROTSE-III Optical Limits
  34. GRB 140114A: Swift-XRT refined Analysis
  35. GRB 140114A: Swift-BAT refined analysis
  36. GRB 140114A: Swift/UVOT Upper Limits
  37. GRB 140114A: KAIT Optical Upper Limit
  38. GRB 140103A: AAO optical afterglow candidate
  39. GRB 140104B: Further Swift XRT observations
  40. GRB 140114A: Enhanced Swift-XRT position
  41. GRB 140114A: RATIR Optical and NIR Afterglow Detection
  42. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  43. GRB 140102A: AAO optical upper limits
  44. GRB 140114A: P60 Observations
  45. GRB 140114A: Swift detection of a burst
  46. GRB 140108A: Konkoly optical observations
  47. GRB 140110A: Swift/UVOT retraction of UVOT candidates
  48. IPN Triangulation of GRB 140110A
  49. GRB 140110A: Swift/UVOT Observations
  50. GRB 140108A: Suzaku WAM observation of the prompt emission
  51. GRB 140104B: Suzaku WAM observation of the prompt emission
  52. GRB 140110A: Swift XRT observations
  53. GRB 140110A: Reported UVOT OT not GRB afterglow
  54. GRB 140110A: OT detection in Swift/UVOT imaging
  55. GRB 140108A BAT refined analysis update *CORRECTION*
  56. GRB 140108A BAT refined analysis update
  57. GRB 140110A: Fermi GBM observation
  58. GRB 140110A Tiled Swift observations
  59. GRB 140110A: Fermi-LAT detection of a burst
  60. GRB 140108A: Mondy optical upper limit
  61. GRB 140105A: MASTER-Net early optical observations and time correction
  62. GRB 131231A: AAO optical observations
  63. GRB 140108A: Swift-BAT refined analysis
  64. GRB 140108A: Fermi GBM detection
  65. GRB 140108A: Swift/UVOT Detection
  66. GRB 140108A: theoretical prediction of redshift and of supernova occurrence
  67. GRB 140108A: Swift-XRT refined Analysis
  68. GRB 140108A: Enhanced Swift-XRT position
  69. GRB 140108A: Mondy optical observations
  70. GRB 140108A: D50+BART optical candidate detection
  71. GRB 140108A: 1.23m CAHA observations
  72. GRB 140108A: MASTER-Net OT detection
  73. GRB 140108A: Prompt enhanced Swift-XRT position
  74. GRB 140108A: Swift detection of a burst
  75. New Fermi-LAT GRB Table
  76. GRB 140105A: HCT Observations
  77. GRB 140105A: continued iPTF observations and rejection of optical candidates
  78. Swift-BAT triggered on KS 1947+300
  79. GRB 140105A: Swift XRT observations
  80. GRB 140103A: Swift XRT afterglow confirmation
  81. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  82. GRB 140104B: Swift XRT observations
  83. GRB 140102A: Swift/UVOT Detection
  84. LOAO R-band Observation of GRB 140102A
  85. GRB 140105A: Fermi GBM detection
  86. GRB 140104B: Fermi GBM observation
  87. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  88. GRB 140102A: BOOTES-4 early optical observations
  89. GRB 140104B: Fermi-LAT detection of a burst
  90. GRB 131209A: Further Swift XRT observations
  91. GRB 140103A: Lulin Optical r-band Observations
  92. GRB 131231A : Lulin Optical Observations
  93. GRB 131231A: CARMA 3mm detection
  94. Swift-BAT trigger 582894 is HR 1099 (Flare star)
  95. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  96. GRB 140102A, Optical Observations
  97. GRB 131231A, 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