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"

19609 results found.

  1. GRB 130518A: P60 Afterglow Observations
  2. GRB 130518A: Swift XRT and UVOT possible afterglow
  3. Konus-Wind observation of GRB 130518A
  4. GRB 130518A Swift-BAT position from ground analysis
  5. GRB 130518A: Fermi LAT detection
  6. GRB 130515A: Further Gemini Observations
  7. Konus-Wind observation of GRB 130515A
  8. GRB 130514B: RATIR Optical and NIR Observations
  9. GRB 130515A: Fermi GBM detection
  10. GRB 130427A: Skynet detections of a possible supernova
  11. GRB 130515A: Swift-XRT refined Analysis
  12. GRB 130515A: Swift/UVOT Upper Limits
  13. GRB 130514B Swift-BAT observations
  14. GRB 130515A: Swift-BAT refined analysis
  15. GRB 130515A: Gemini/GMOS Observations
  16. GRB 130515A: GROND Observations
  17. GRB 130515A: Enhanced Swift-XRT position
  18. GRB 130511A: SSO 2.3m observation
  19. GRB 130514B: Swift-XRT Observations
  20. GRB 130515A: Swift detection of a short burst
  21. GRB 130514A: Swift-XRT refined Analysis
  22. GRB 130514A: Skynet/PROMPT/DSO Detections
  23. GRB 130513A: Bassano Bresciano optical upper limit
  24. GRB 130427A: optical observations
  25. GRB 130514A: RATIR Optical and NIR Observations
  26. GRB 130513A: RATIR Optical and NIR Observations
  27. GRB 130513A: Swift/UVOT Upper Limits
  28. GRB 130514A: Swift/UVOT Upper Limits
  29. GRB 130514A: Enhanced Swift-XRT position
  30. GRB 130514A: Swift-BAT refined analysis
  31. GRB 130513A: Swift-XRT detection of the afterglow.
  32. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  33. GRB 130514A: Swift detection of a burst
  34. GRB130508A: MASTER-Net optical observations
  35. GRB 130511A: Swift-XRT refined Analysis
  36. GRB 130511A, Swift-BAT refined analysis
  37. GRB 130511A: Enhanced Swift-XRT position
  38. GRB 130511A: Gemini-North Redshift
  39. GRB 130511A: Swift detection of a burst with an optical counterpart
  40. GRB 130508A: Swift/UVOT Upper Limits
  41. GRB 130508A: RATIR Optical and NIR Observations
  42. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  43. GRB 130508A, Swift-BAT refined analysis
  44. GRB130508A: BOOTES-3 optical limit
  45. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  46. GRB 130508A: Swift detection of a probable burst
  47. GRB 130505B: Further Swift observations
  48. GRB 130504C: Swift-XRT afterglow confirmation
  49. GRB 130504C: Suzaku WAM observation of the prompt emission
  50. GRB 130504B: Suzaku WAM observation of the prompt emission
  51. GRB 130505A: Suzaku WAM observation of the prompt emission
  52. GRB 130427A, Watcher afterglow detection
  53. GRB 130505B: Swift Candidate Afterglow
  54. Refined IPN Triangulation of GRB 130502B
  55. GRB 130505A, Swift-BAT refined analysis
  56. GRB 130504C: further Swift-XRT observations
  57. GRB 130505A: optical observations
  58. GRB 130504C: Swift-XRT observations
  59. GRB 130427A: optical observations in CrAO
  60. GRB 130502A: optical upper limit
  61. GRB 130505A: Swift-XRT refined Analysis
  62. GRB 130505A: Largest E_iso ever measured
  63. Konus-Wind observation of GRB 130505A
  64. GRB 130504C: Fermi-LAT detection of a burst
  65. Swift/UVOT observations of GRB130505A
  66. GRB 130505A: Enhanced Swift-XRT position
  67. GRB 130505A: MAXI/GSC detection
  68. GRB 130505A: Swift detection of a burst with optical afterglow
  69. IPN Triangulation of GRB 130504B
  70. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  71. GRB 130504A: Enhanced XRT position
  72. GRB 130502B: Suzaku WAM observation of the prompt emission
  73. GRB 130504A: Swift/UVOT Upper Limits
  74. GRB 130502B: Swift-XRT refined Analysis
  75. GRB 130504A, Swift-BAT refined analysis
  76. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  77. Trigger 555096: Swift detection of a possible burst
  78. GRB 130502A: Swift-BAT refined analysis
  79. GRB130502A: MASTER-Net optical observations
  80. GRB 130502A: Swift-XRT refined Analysis
  81. IPN Triangulation of GRB 130502B
  82. GRB 130502A: Fermi GBM detection
  83. GRB 130502B: Swift/UVOT Upper Limits
  84. GRB 130502A: Swift/UVOT Upper Limits
  85. GRB 130502B Swift-XRT observations
  86. GRB 130502A: RATIR Optical and NIR Observations
  87. GRB 130502A: Enhanced Swift-XRT position
  88. GRB 130502B: Fermi LAT Detection
  89. GRB 130502A: T100 Observations
  90. GRB 130502A: Swift detection of a burst
  91. GRB 130427A: Predictions about the occurrence of a supernova
  92. GRB 130427A: High-energy neutrino search
  93. Swift-BAT trigger 554135 is noise
  94. GRB 130427A: Challis Observatory optical observations
  95. GRB 130427A: Continued Skynet/PROMPT Observations
  96. GRB 130427A: Fermi-LAT refined analysis
  97. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  98. GRB 130427A: Improved Swift-XRT analysis
  99. GRB 100728A: GROND host detection and X-shooter redshift
  100. GRB 130427A: Skynet/PROMPT Observations

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