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"

28282 results found.

  1. GRB 120510A: Swift XRT and UVOT observations
  2. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  3. GRB 120422A: P200 NIR detection
  4. GRB 120422A: Gemini-N detection of a supernova
  5. GRB 120422A: optical observations
  6. Konus-Wind observation of GRB 120427A
  7. Swift detection of 4U 1630-47
  8. GRB 120422A, the review of the sky area in plate archives
  9. Konus-Wind observation of GRB 120426A
  10. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  11. IPN Triangulation of bright GRB 120426A
  12. GRB 120422A: MITSuME Ishigakijima upper limit
  13. Swift Trigger 520928 is probably not a burst
  14. GRB 120422A: 272 GHz observations from SMA
  15. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  16. GRB 120422A GROND observations
  17. GRB 120422A: Super-LOTIS early observations
  18. GRB 120422A: NOT optical observations
  19. GRB 120422A: Zadko observatory - Gingin optical observations
  20. GRB 120422A: Swift-XRT refined Analysis
  21. GRB 120422A: A Swift/UVOT Detection
  22. GRB 120422A: Enhanced Swift-XRT position
  23. GRB 120422A: Swift-BAT refined analysis
  24. GRB 120422A: Gemini observations
  25. GRB 120422A: Faulkes Telescope North observations
  26. GRB 120422A: Swift detection of a burst
  27. GRB 120419A: Swift-XRT and UVOT observations
  28. GRB 120419A: A long GRB detected by INTEGRAL
  29. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  30. Swift Trigger 519874 is probably a noise event
  31. Trigger 519868: Swift detection of SGR1806-20
  32. GRB 120404A: optical observations in Mondy observatory
  33. GRB 120404A: optical observations
  34. GRB 120404A, Optical Observations
  35. GRB 120404A: MASTER OT observations
  36. GRB120404A: GROND observations show steeply decaying afterglow
  37. GRB120404A: MOA optical observations of the initial rise afterglow
  38. GRB 120404A: VLT/X-shooter redshift confirmation
  39. GRB 120404A: Swift/UVOT Detection
  40. GRB 120404A: MITSuME Ishigakijima Optical Observation
  41. GRB 120404A: MITSuME Okayama Optical Observation
  42. GRB 120403B: Swift-XRT refined Analysis
  43. GRB 120404A: Swift-XRT refined Analysis
  44. GRB 120404A: Swift-BAT refined analysis
  45. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  46. GRB 120404A: Enhanced Swift-XRT position
  47. GRB 120402B: MASTER early OT limit
  48. GRB 120403B: TAROT La Silla observatory optical observations
  49. GRB 120403B: Fermi GBM Observation
  50. GRB 120404A: Gemini-N Redshift
  51. GRB 120403B: AAT nIR observations
  52. GRB 120404A: Faulkes Telescope North afterglow confirmation
  53. GRB 120404A: Swift detection of a burst with an optical counterpart
  54. GRB 120403B: Swift-BAT refined analysis
  55. GRB 120403B: Swift/UVOT Upper Limits
  56. GRB 120403B: Enhanced Swift-XRT position
  57. GRB 120403A: Swift/BAT spectral lag analysis
  58. GRB 120403B: Swift detection of a burst
  59. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  60. GRB 120326A, the review of the sky area in plate archives
  61. GRB 120402A: optical upper limit
  62. GRB 120320A: optical upper limit in Mondy observatory
  63. GRB 120320A: early optical upper limit
  64. GRB 120403A, Swift-BAT refined analysis
  65. GRB 120402B: Fermi GBM detection
  66. GRB 120328B: Pi of the Sky simultaneous upper limits
  67. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  68. GRB 120402A: Swift detection of a possible burst or noise
  69. GRB 120326A: Cima Rest and Bassano Brescia
  70. GRB 120327A: SMARTS optical/IR afterglow observations
  71. GRB 120401A: Swift-XRT refined Analysis
  72. GRB 120401A: Swift-BAT refined analysis
  73. GRB 120401A: Enhanced Swift-XRT position
  74. GRB 120401A: Swift detection of a burst
  75. GRB 120324A: CrAO optical upper limit
  76. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  77. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  78. GRB 120326A : Suzaku WAM observation of the prompt emission
  79. GRB 120324A, the review of the sky area in plate archives
  80. GRB 120326A: Bassano Bresciano Observatory optical observations
  81. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  82. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  83. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  84. Swift trigger 518853: MASTER-ICATE possible OT
  85. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  86. Trigger 518853: Swift detection of a probable Galactic transient
  87. GRB 120328B: Fermi-LAT Observations
  88. GRB 120327A: Zadko optical observations
  89. GRB 120328B: Fermi GBM detection
  90. GRB 120328A: Swift/UVOT Upper Limits
  91. GRB 120328A: Swift-XRT refined Analysis
  92. IPN Triangulation of GRB 120328B (long/intense)
  93. GRB 120327A: MITSuME Ishigakijima Optical Observation
  94. GRB 120326A: MITSuME Ishigakijima Optical Observation
  95. GRB 120328A: Swift-BAT refined analysis
  96. GRB 120328A: Enhanced Swift-XRT position
  97. GRB 120327A: NOT optical observations
  98. GRB 120328A: TAROT La Silla observatory optical observations
  99. Skynet/PROMPT observations of GRB120328A
  100. GRB 120328A: Swift detection of a burst

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