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"

28303 results found.

  1. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  2. GRB 121017A: Swift/UVOT Upper Limits
  3. GRB 121017A: Swift-XRT refined Analysis
  4. GRB 121017A: GROND Observations
  5. GRB 121017A: Swift-BAT refined analysis
  6. GRB 121017A: Enhanced Swift-XRT position
  7. GRB 121017A: 1.23m CAHA R-band observations
  8. GRB 121017A optical observations
  9. GRB 121017A: Swift detection of a burst
  10. GRB 121011B: Suzaku WAM observation of the prompt emission
  11. GRB 121011A Suzaku WAM observation of the prompt emission
  12. GRB 121012A: Fermi GBM detection
  13. GRB 121014A: Swift-BAT refined analysis
  14. GRB 121014A: Swift detection of a burst
  15. GRB 121011A: Swift/UVOT Detection
  16. GRB 121011A: misprint in GCNC 13854
  17. GRB 121011A: Fermi GBM observation
  18. GRB 121011A: Fermi-LAT detection of a burst
  19. GRB 121011A: Swift-XRT refined Analysis
  20. GRB 121011A: optical observations
  21. GRB 121011A: MASTER-Net bell light curve
  22. GRB 121011A, Swift-BAT refined analysis
  23. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  24. GRB 121011A: Enhanced Swift-XRT position
  25. GRB 121011A: MITSuME Okayama Optical Observation
  26. GRB 121011A: Swift detection of a burst with optical afterglow
  27. Trigger 535747: Swift detection of an outburst from SGR1806-20
  28. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  29. GRB 120927A: optical upper limit
  30. GRB 120804A: Late-time Chandra observation
  31. GRB 121001A: GROND Afterglow Confirmation
  32. GRB 121001A: Swift/UVOT Upper Limits
  33. GRB 121001A: Swift-XRT refined Analysis
  34. GRB 121001A: Enhanced Swift-XRT Position
  35. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  36. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  37. GRB 121001A: possible optical counterpart
  38. Swift Trigger 535026: Galactic Transient or possible GRB
  39. GRB 120927A: Swift/UVOT Upper Limits
  40. GRB 120927A, Swift-BAT refined analysis
  41. GRB 120927A: GROND upper limits
  42. GRB 120927A: Swift-XRT refined Analysis
  43. GRB 120927A: Enhanced Swift-XRT position
  44. GRB 120923A: JHK Observation
  45. GRB 120927A: Swift detection of a burst
  46. Further Swift-XRT observations of the GRB 120919A field.
  47. GRB 120923A: optical upper limit
  48. GRB 120921A: Fermi GBM detection of its 1000th GRB
  49. GRB 120923A: RAPTOR Early Afterglow Limits
  50. GRB 120923A: MITSuME Okayama Optical upper limits
  51. GRB 120916A Suzaku WAM observation of the prompt emission
  52. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  53. GRB 120923A: Swift-XRT refined Analysis
  54. GRB 120923A: GROND Upper limits
  55. GRB 120922A: GROND photometric redshift
  56. GRB 120922A: Fermi GBM detection
  57. GRB 120922A: Swift/UVOT Detection
  58. GRB 120923A: Swift-BAT refined analysis
  59. GRB 120922A: Swift-BAT refined analysis
  60. GRB 120923A: Swift/UVOT Upper Limit
  61. GRB 120922A: Swift-XRT refined Analysis
  62. GRB 120922A: Swift/UVOT Observations
  63. GRB 120923A: Enhanced Swift-XRT position
  64. GRB 120922A: Enhanced Swift-XRT position
  65. GRB 120922A: TAROT La Silla observatory optical observations
  66. GRB 120923A: TAROT La Silla observatory optical observations
  67. GRB 120923A: Swift detection of a burst
  68. GRB 120922A: GROND afterglow candidate
  69. GRB 120922A: Swift detection of a burst
  70. GRB 120919B: MASTER prompt optical observations
  71. GRB 120919A: Swift/UVOT Upper Limits
  72. GRB 120919A: Swift-XRT observations
  73. GRB 120919A: Fermi GBM detection
  74. GRB 120918A: Swift-BAT refined analysis
  75. Swift trigger 534017 was not an astrophysical event
  76. GRB 120916A: Fermi GBM Observation
  77. Swift Trigger 534017 is probably not real.
  78. IPN Triangulation of long GRB 120916A
  79. Swift Trigger 533836 is a new Galactic transient
  80. GRB 120913B: Swift-BAT refined analysis
  81. GRB 120913A: Swift-BAT refined analysis
  82. GRB 120913B: REM NIR early time detection
  83. Continued Skynet/PROMPT observations of GRB120913B
  84. GRB 120913B: TAROT La Silla observatory optical photometry
  85. GRB 120913B: TAROT La Silla observatory optical detection
  86. Skynet/PROMPT observations of GRB120913B
  87. GRB 120907A: optical observations of ISON-Kislovodsk
  88. GRB 120911A: optical upper limit CrAO
  89. GRB 120911A: optical upper limit ISON-NM
  90. GRB 120911B: Fermi-LAT detection of a burst
  91. GRB 120911A: Fermi GBM observation
  92. GRB120911A: MITSuME Okayama Optical upper limits
  93. GRB 120911A: Fermi/LAT upper limit
  94. GRB 120911A: Swift/UVOT Upper Limits
  95. GRB 120911A: Swift-XRT refined Analysis
  96. GRB 120911A: Swift-BAT refined analysis
  97. GRB 120911A: Enhanced Swift-XRT position
  98. GRB 120911A: Swift-XRT observations
  99. GRB 120911A: ROTSE-III Optical Limits
  100. GRB 120911A: 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