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"

36384 results found.

  1. Konus-Wind observation of GRB 110815A
  2. IPN triangulation of GRB110815A (long, intense)
  3. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  4. GRB 110801A: optical observations at Mt. Terskol observatory
  5. GRB 110812A: SuperAGILE localization of a long GRB.
  6. Reprocessed enhanced Swift-XRT positions and GRB products: update
  7. SGR 1834.9-0846/ GRB 110807A, I-band observations
  8. Konus-Wind observation of GRB 110808B
  9. Konus-Wind observation of GRB 110808A
  10. IPN triangulation of GRB 110808B (short/hard/intense)
  11. A new photometric resource for GRB observers
  12. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  13. Fermi Gamma-ray Burst Monitor trigger 110809.346 is not a GRB
  14. GRB 110808A: Swift/UVOT Detection
  15. Swift Trigger 458942 is probably not a burst
  16. GRB 110808A: Swift-BAT refined analysis
  17. GRB 110808A: Swift-XRT refined Analysis
  18. SGR J1834.9-0846: A Neutron Star in W41?
  19. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  20. GRB 110808A: VLT/X-shooter spectroscopy
  21. GRB 110808A: Enhanced Swift-XRT position
  22. GRB 110808A: Swift detection of a burst with optical counterpart
  23. GRB 110807A: SAO RAS observations
  24. GRB 110807A: Swift detection of a burst or a posible new SGR
  25. Fermi Gamma-ray Burst Monitor trigger 110806.263 is not a GRB
  26. GRB 110726A: two epochs of SAO RAS optical observations
  27. Reprocessed enhanced Swift-XRT positions and GRB products
  28. Konus-Wind observation of GRB 110802A
  29. Fermi GBM trigger 334123030 (110804165) is not a GRB
  30. IPN triangulation of GRB110802A (short/hard burst)
  31. GRB 110801A: optical observations in CrAO
  32. EVLA observation for Fermi burst GRB 110721A
  33. GRB 110731A : Suzaku WAM observation of the prompt emission
  34. GRB 110726A: Swift-XRT refined Analysis
  35. GRB 110801A: SAO RAS optical observations
  36. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  37. GRB 110801A: Evidence for a jet break
  38. GRB 110801A: MASTER OT observations
  39. GRB 110801A: Swift-BAT refined analysis
  40. Swift/UVOT observations of GRB110801A
  41. GRB 110801A: Swift-XRT refined Analysis
  42. GRB 110801A: Afterglow redshift from 10.4m GTC
  43. GRB110801A: MITSuME Ishigakijima Optical Observation
  44. GRB 110801A: Enhanced Swift-XRT position
  45. AXP 4U 0142+61: Fermi GBM detection
  46. GRB 110801A: TLS Optical afterglow confirmation
  47. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  48. GRB 110801A: Swift detection of a burst with an optical counterpart
  49. GRB 110731A / EVLA upper limits
  50. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  51. GRB 110731A Gemini-N redshift
  52. GRB 110731A: Swift-XRT refined Analysis
  53. Konus-Wind observation of GRB 110731A
  54. GRB110731A: Swift/UVOT Observations
  55. GRB 110731A: Fermi GBM observation
  56. GRB 110731A: NOT photometry
  57. GRB 110731A: Enhanced Swift-XRT position
  58. Fermi-LAT Detection of GRB110731A
  59. GRB 110731A: Swift-BAT refined analysis
  60. GRB 110731A: FTN+FTS afterglow observations
  61. GRB 110731A: Swift detection of a burst with an optical counterpart
  62. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  63. GRB 110721A: Swift observations of afterglow candidate
  64. GRB 110726A: optical upper limit in CrAO
  65. GRB 110726A: EVLA observations
  66. GRB 110726A: IAC80 R-band observations
  67. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  68. GRB110726A: MITSuME Ishigakijima Optical Observation
  69. GRB 110726A: Further Swift/UVOT Observations
  70. GRB110726A: Gemini-N tentative redshift
  71. GRB 110726A: Swift-BAT refined analysis
  72. GRB 110726A: Enhanced Swift-XRT position
  73. GRB 110726A: Swift/UVOT Detection
  74. GRB 110726A: Liverpool Telescope observations
  75. GRB 110726: ROTSE-III Detection of Optical Counterpart
  76. GRB 110726A: Swift detection of a burst
  77. IPN triangulation of GRB 110721A
  78. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  79. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  80. GRB 110721A: potential counterpart candidate
  81. Konus-Wind observation of GRB 110721A
  82. GRB 110709B / EVLA detection of radio counterpart
  83. GRB 110719A / SMA 345 GHz upper limits
  84. GRB 110721A: Fermi-LAT detection
  85. GRB 110721A: Fermi GBM detection
  86. GRB110715A: spectral lag analysis
  87. GRB 110715A : Suzaku WAM observation of the prompt emission
  88. GRB 110719A: GRT Optical Observation
  89. GRB 110719A: optical limit by "Pi of the Sky"
  90. GRB 110719A: z-band upper limit
  91. Swift/UVOT observations of GRB110719A
  92. GRB 110719A: Swift-XRT refined Analysis
  93. GRB 110719A: optical upper limit
  94. GRB 110719A: Enhanced Swift-XRT position
  95. GRB 110719A: Swift-BAT refined analysis
  96. GRB 110715A optical observations
  97. GRB 110719A: Swift detection of a burst
  98. GRB 110709B : Suzaku WAM observation of the prompt emission
  99. GRB 110715A: ATCA detection of the radio counterpart
  100. GRB110715A: GROND Detection of the Optical/NIR 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