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"

28284 results found.

  1. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  2. GRB 110915A: NOT observations
  3. GRB 110915A: 1.23m CAHA I-band observations
  4. GRB 110915B: SuperAGILE localization of a long GRB
  5. GRB 110915A: Enhanced Swift-XRT position
  6. GRB 110915A: GMG optical upper limit
  7. GRB 110915A: MASTER-Net early limit
  8. GRB 110915A: Swift detection of a burst
  9. GRB 110825A: Further Swift/XRT Observations
  10. GRB 110731A: SAO RAS and Terskol observations
  11. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  12. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  13. GRB 110903A: Swift/UVOT Upper Limits
  14. GRB 110903A: Swift-XRT observations
  15. GRB 110820A: optical upper limit
  16. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  17. Trigger 502024: Swift detection of KS 1741-293
  18. GRB110825A: Fermi GBM observation
  19. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  20. Swift detection of an SGR burst from Swift J1834.9-0846
  21. GRB 110825A: Suzaku WAM observation of the prompt emission
  22. GRB 110825A: GMG optical observation
  23. GRB 110827A, Swift-BAT refined analysis
  24. GRB 110825A: optical afterglow candidate
  25. GRB 110825A: field inspection and possible host galaxy
  26. GRB110825A: Swift target of opportunity observation
  27. IPN triangulation of GRB110825A (very intense, long-duration)
  28. GRB 110820A, the review of the sky area in plate archives
  29. Swift-BAT Trigger 501485 is noise
  30. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  31. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  32. GRB 110820A: Swift/UVOT Upper Limits
  33. GRB 110820A: Swift-XRT refined Analysis
  34. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  35. GRB 110820A: Swift-BAT refined analysis
  36. GRB 110820A: Enhanced Swift-XRT position
  37. GRB 110820A: CrAO optical upper limit
  38. GRB 110820A: Swift detection of a burst
  39. GRB 110818A: Swift/UVOT Upper Limits
  40. GRB 110818A: Enhanced Swift-XRT position
  41. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  42. GRB 110818A: Swift-XRT refined Analysis
  43. GRB 110815A: Swift-XRT and UVOT refined Analysis
  44. GRB 110818A, Swift-BAT refined analysis
  45. GRB 110815A : Suzaku WAM observation of the prompt emission
  46. GRB 110818A: Swift detection of a burst
  47. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  48. GRB 110801A: optical observations at Mt. Terskol observatory
  49. GRB 110812A: SuperAGILE localization of a long GRB.
  50. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  51. GRB 110808A: Swift/UVOT Detection
  52. GRB 110808A: Swift-BAT refined analysis
  53. GRB 110808A: Swift-XRT refined Analysis
  54. SGR J1834.9-0846: A Neutron Star in W41?
  55. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  56. GRB 110808A: Enhanced Swift-XRT position
  57. GRB 110808A: Swift detection of a burst with optical counterpart
  58. Fermi GBM detection of a SGR-like burst
  59. GRB 110807A: SAO RAS observations
  60. GRB 110807A: Swift detection of a burst or a posible new SGR
  61. GRB 110726A: two epochs of SAO RAS optical observations
  62. IPN triangulation of GRB110802A (short/hard burst)
  63. GRB 110801A: optical observations in CrAO
  64. EVLA observation for Fermi burst GRB 110721A
  65. GRB 110731A : Suzaku WAM observation of the prompt emission
  66. GRB 110726A: Swift-XRT refined Analysis
  67. GRB 110801A: SAO RAS optical observations
  68. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  69. GRB 110801A: Swift-BAT refined analysis
  70. Swift/UVOT observations of GRB110801A
  71. GRB 110801A: Swift-XRT refined Analysis
  72. GRB110801A: MITSuME Ishigakijima Optical Observation
  73. GRB 110801A: Enhanced Swift-XRT position
  74. GRB 110801A: Swift detection of a burst with an optical counterpart
  75. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  76. GRB 110731A Gemini-N redshift
  77. GRB 110731A: Swift-XRT refined Analysis
  78. GRB110731A: Swift/UVOT Observations
  79. GRB 110731A: Fermi GBM observation
  80. GRB 110731A: NOT photometry
  81. GRB 110731A: Enhanced Swift-XRT position
  82. GRB 110731A: Swift-BAT refined analysis
  83. GRB 110731A: FTN+FTS afterglow observations
  84. GRB 110731A: Swift detection of a burst with an optical counterpart
  85. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  86. INTEGRAL Weak trigger #6331: GRT Optical Observation
  87. GRB 110721A: Swift observations of afterglow candidate
  88. AXP 4U 0142+61: Swift-BAT refined analysis
  89. GRB 110726A: optical upper limit in CrAO
  90. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  91. GRB110726A: MITSuME Ishigakijima Optical Observation
  92. GRB 110726A: Further Swift/UVOT Observations
  93. GRB110726A: Gemini-N tentative redshift
  94. GRB 110726A: Swift-BAT refined analysis
  95. GRB 110726A: Enhanced Swift-XRT position
  96. GRB 110726A: Swift/UVOT Detection
  97. GRB 110726A: Liverpool Telescope observations
  98. GRB 110726: ROTSE-III Detection of Optical Counterpart
  99. GRB 110726A: Swift detection of a burst
  100. IPN triangulation of GRB 110721A

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