Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

36197 results found.

  1. GRB 110820A: Enhanced Swift-XRT position
  2. GRB 110820A: CrAO optical upper limit
  3. GRB 110820A: MASTER-NET observations
  4. GRB 110820A: Swift detection of a burst
  5. GRB 110818A: Fermi GBM observation
  6. GRB 110818A: Swift/UVOT Upper Limits
  7. GRB 110818A: Enhanced Swift-XRT position
  8. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  9. GRB 110818A: Swift-XRT refined Analysis
  10. GRB 110815A: Swift-XRT and UVOT refined Analysis
  11. GRB 110818A, Swift-BAT refined analysis
  12. GRB 110815A : Suzaku WAM observation of the prompt emission
  13. GRB 110818A: Swift detection of a burst
  14. Konus-Wind observation of GRB 110815A
  15. IPN triangulation of GRB110815A (long, intense)
  16. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  17. GRB 110801A: optical observations at Mt. Terskol observatory
  18. GRB 110812A: SuperAGILE localization of a long GRB.
  19. Reprocessed enhanced Swift-XRT positions and GRB products: update
  20. SGR 1834.9-0846/ GRB 110807A, I-band observations
  21. Konus-Wind observation of GRB 110808B
  22. Konus-Wind observation of GRB 110808A
  23. IPN triangulation of GRB 110808B (short/hard/intense)
  24. A new photometric resource for GRB observers
  25. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  26. Fermi Gamma-ray Burst Monitor trigger 110809.346 is not a GRB
  27. GRB 110808A: Swift/UVOT Detection
  28. Swift Trigger 458942 is probably not a burst
  29. GRB 110808A: Swift-BAT refined analysis
  30. GRB 110808A: Swift-XRT refined Analysis
  31. SGR J1834.9-0846: A Neutron Star in W41?
  32. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  33. GRB 110808A: VLT/X-shooter spectroscopy
  34. GRB 110808A: Enhanced Swift-XRT position
  35. GRB 110808A: Swift detection of a burst with optical counterpart
  36. GRB 110807A: SAO RAS observations
  37. GRB 110807A: Swift detection of a burst or a posible new SGR
  38. Fermi Gamma-ray Burst Monitor trigger 110806.263 is not a GRB
  39. GRB 110726A: two epochs of SAO RAS optical observations
  40. Reprocessed enhanced Swift-XRT positions and GRB products
  41. Konus-Wind observation of GRB 110802A
  42. Fermi GBM trigger 334123030 (110804165) is not a GRB
  43. IPN triangulation of GRB110802A (short/hard burst)
  44. GRB 110801A: optical observations in CrAO
  45. EVLA observation for Fermi burst GRB 110721A
  46. GRB 110731A : Suzaku WAM observation of the prompt emission
  47. GRB 110726A: Swift-XRT refined Analysis
  48. GRB 110801A: SAO RAS optical observations
  49. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  50. GRB 110801A: Evidence for a jet break
  51. GRB 110801A: MASTER OT observations
  52. GRB 110801A: Swift-BAT refined analysis
  53. Swift/UVOT observations of GRB110801A
  54. GRB 110801A: Swift-XRT refined Analysis
  55. GRB 110801A: Afterglow redshift from 10.4m GTC
  56. GRB110801A: MITSuME Ishigakijima Optical Observation
  57. GRB 110801A: Enhanced Swift-XRT position
  58. AXP 4U 0142+61: Fermi GBM detection
  59. GRB 110801A: TLS Optical afterglow confirmation
  60. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  61. GRB 110801A: Swift detection of a burst with an optical counterpart
  62. GRB 110731A / EVLA upper limits
  63. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  64. GRB 110731A Gemini-N redshift
  65. GRB 110731A: Swift-XRT refined Analysis
  66. Konus-Wind observation of GRB 110731A
  67. GRB110731A: Swift/UVOT Observations
  68. GRB 110731A: Fermi GBM observation
  69. GRB 110731A: NOT photometry
  70. GRB 110731A: Enhanced Swift-XRT position
  71. Fermi-LAT Detection of GRB110731A
  72. GRB 110731A: Swift-BAT refined analysis
  73. GRB 110731A: FTN+FTS afterglow observations
  74. GRB 110731A: Swift detection of a burst with an optical counterpart
  75. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  76. GRB 110721A: Swift observations of afterglow candidate
  77. GRB 110726A: optical upper limit in CrAO
  78. GRB 110726A: EVLA observations
  79. GRB 110726A: IAC80 R-band observations
  80. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  81. GRB110726A: MITSuME Ishigakijima Optical Observation
  82. GRB 110726A: Further Swift/UVOT Observations
  83. GRB110726A: Gemini-N tentative redshift
  84. GRB 110726A: Swift-BAT refined analysis
  85. GRB 110726A: Enhanced Swift-XRT position
  86. GRB 110726A: Swift/UVOT Detection
  87. GRB 110726A: Liverpool Telescope observations
  88. GRB 110726: ROTSE-III Detection of Optical Counterpart
  89. GRB 110726A: Swift detection of a burst
  90. IPN triangulation of GRB 110721A
  91. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  92. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  93. GRB 110721A: potential counterpart candidate
  94. Konus-Wind observation of GRB 110721A
  95. GRB 110709B / EVLA detection of radio counterpart
  96. GRB 110719A / SMA 345 GHz upper limits
  97. GRB 110721A: Fermi-LAT detection
  98. GRB 110721A: Fermi GBM detection
  99. GRB110715A: spectral lag analysis
  100. GRB 110715A : Suzaku WAM observation of the prompt emission

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