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"

45986 results found.

  1. INTEGRAL Weak trigger #6331: GRT Optical Observation
  2. GRB 110721A: Swift observations of afterglow candidate
  3. AXP 4U 0142+61: Swift-BAT refined analysis
  4. GRB 110726A: optical upper limit in CrAO
  5. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  6. Swift triggers 458268 and 458269 are not astrophysical
  7. GRB 110726A: EVLA observations
  8. GRB 110726A: IAC80 R-band observations
  9. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  10. GRB110726A: MITSuME Ishigakijima Optical Observation
  11. GRB 110726A: Further Swift/UVOT Observations
  12. GRB110726A: Gemini-N tentative redshift
  13. GRB 110726A: Swift-BAT refined analysis
  14. GRB 110726A: Enhanced Swift-XRT position
  15. GRB 110726A: Swift/UVOT Detection
  16. GRB 110726A: Liverpool Telescope observations
  17. GRB 110726: ROTSE-III Detection of Optical Counterpart
  18. GRB 110726A: Swift detection of a burst
  19. IPN triangulation of GRB 110721A
  20. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  21. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  22. GRB 110721A: potential counterpart candidate
  23. Konus-Wind observation of GRB 110721A
  24. GRB 110709B / EVLA detection of radio counterpart
  25. GRB 110719A / SMA 345 GHz upper limits
  26. GRB 110721A: Fermi-LAT detection
  27. GRB 110721A: Fermi GBM detection
  28. Recent GCN/Swift-BAT Slew Burst Position notices are due to playback debugging
  29. GRB110715A: spectral lag analysis
  30. GRB 110715A : Suzaku WAM observation of the prompt emission
  31. GRB 110719A: GRT Optical Observation
  32. GRB 110719A: optical limit by "Pi of the Sky"
  33. GRB 110719A: z-band upper limit
  34. Swift/UVOT observations of GRB110719A
  35. Swift J1822.3-1606 : Fermi GBM observation
  36. GRB 110719A: Swift-XRT refined Analysis
  37. GRB 110719A: optical upper limit
  38. GRB 110719A: Enhanced Swift-XRT position
  39. GRB 110719A: Swift-BAT refined analysis
  40. GRB 110715A optical observations
  41. GRB 110719A: Swift detection of a burst
  42. GRB 110709B : Suzaku WAM observation of the prompt emission
  43. GRB 110715A: ATCA detection of the radio counterpart
  44. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  45. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  46. GRB 110715A: APEX detection of the submm counterpart
  47. Swift J1822.3-1606
  48. Konus-Wind observation of GRB 110715A
  49. GRB 110715A: Swift-XRT refined Analysis
  50. GRB110715A: VLT redshift
  51. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  52. GRB 110715A: Swift/UVOT Detection
  53. GRB 110715A: Enhanced Swift-XRT position
  54. GRB 110715A: Swift-BAT refined analysis
  55. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  56. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  57. GRB 110709B: Swift/UVOT Observations
  58. GRB 110709A / EVLA upper limits
  59. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  60. Swift trigger 457076 is not a GRB
  61. Konus-Wind observation of GRB 110708B
  62. GRB 110709A: Suzaku WAM observation of the prompt emission
  63. GRB 110709B: Submm observations from APEX
  64. IPN triangulation of GRB 110708B (long duration, extremely intense)
  65. Swift Trigger 457076: a possible GRB
  66. GRB 110709A: Swift/UVOT Upper Limits
  67. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  68. GRB 110709A: Konkoly observations
  69. GRB 110708A: Konkoly observations
  70. GRB 110709B BAT refined analysis
  71. GRB 110709B: burst detection from Swift-BAT slew data
  72. GRB 110709B: Swift-XRT refined Analysis
  73. GRB 110709A: Swift-XRT refined Analysis
  74. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  75. GRB110709A: MITSuME Ishigakijima Optical upper limits
  76. Konus-Wind observation of GRB 110709A
  77. GRB 110709B: correction to GCN 12135 (Konus-Wind peak flux)
  78. GRB 110709B: Enhanced Swift-XRT position
  79. Konus-Wind observation of GRB 110709B
  80. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  81. GRB 110709A: Fermi GBM observation
  82. GRB 110709B: Gemini-South additional analysis and photometry
  83. GRB 110709B : A possible source in USNO B 1.0
  84. GRB 110709B: Preliminary Swift-BAT refined analysis
  85. GRB 110709B: GROND Detection of an Afterglow Candidate
  86. GRB 110709B: Gemini-South optical observations
  87. GRB 110709A: Swift-BAT refined analysis
  88. GRB 110709B: possible quiescent source in DSS
  89. GRB 110709A : Xinglong TNT upper limit
  90. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  91. GRB 110709A: Enhanced Swift-XRT position
  92. GRB 110709B: Swift detection of a burst
  93. GRB 110708A: Swift/UVOT Observations
  94. GRB 110709A: MASTER-NET optical observations
  95. GRB 110709A: Prompt enhanced Swift-XRT position
  96. GRB 110709A: Swift detection of a burst
  97. GRB 110708A: Liverpool Telescope observations
  98. GRB 110708A: Lick observations
  99. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  100. GRB 110705A: 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