Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19607 results found.

  1. GRB 100906A: MASTER early OT observations
  2. GRB 100906A: Swift detection of a burst with an optical afterglow
  3. GRB 100905A: Swift-XRT refined analysis.
  4. GRB 100905A: Enhanced Swift-XRT position
  5. GRB 100905A: Swift-BAT refined analysis
  6. GRB100904A: BOOTES-3 Upper Limit
  7. GRB 100905A: MASTER Prompt Optical Observations
  8. GRB 100905A: Faulkes Telescope North observations
  9. GRB 100905A: Swift detection of a burst
  10. GRB 100904A: Swift-BAT refined analysis
  11. GRB 100904A: Swift detection of a burst
  12. GRB 100902A: Swift-BAT refined analysis
  13. GRB 100901A: optical observation at Mt.Terskol
  14. GRB 100901A: multicolor photometry at Mt.Terskol
  15. IPN Triangulation of the very bright GRB 100829A
  16. GRB 100901A: Lightbuckets Optical Observations
  17. GRB 100902A: 1.5m OSN I-band Upper Limits
  18. Tentative redshift of GRB100902A from Swift-XRT data
  19. GRB 100902A: Swift XRT refined analysis
  20. GRB 100902A: Swift/UVOT Upper Limits
  21. GRB 100902A: optical observation at Mt.Terskol
  22. GRB 100901A: optical observation at Mt.Terskol
  23. GRB 100902A: Enhanced Swift-XRT position
  24. GRB 100901A: TLS Observations: Break?
  25. GRB 100902A: MASTER Prompt Optical Observations
  26. GRB 100901A: ISON-NM optical observations
  27. GRB 100902A: MASTER Optical Early Limit
  28. GRB 100902A: Swift detection of a burst
  29. GRB 100901A: 1.5m OSN BVRI-band observations.
  30. GRB 100901A: ROTSE-III Detection
  31. Swift/UVOT Observations of GRB100901A
  32. GRB 100901A: Swift-XRT Team refined analysis
  33. GRB 100901A: Swift-BAT refined analysis
  34. GRB 100901A: optical observation at Mt.Terskol
  35. GRB 100901A: Enhanced Swift-XRT position
  36. GRB 100901A: optical observation at Mt.Terskol
  37. GRB 100901A: MASTER power low decay
  38. GRB 100901A: MASTER: the OT brightenning
  39. GRB 100901A: confirmation of the afterglow
  40. GRB 100901A: MASTER Optical Early Limits
  41. GRB 100901A: Faulkes Telescope North afterglow candidate
  42. GRB 100901A: Swift detection of a burst with an optical afterglow
  43. GRB 100823A: optical upper limit
  44. GRB 100814A: Maidanak optical observations
  45. GRB 100823A: optical observations
  46. GRB 100823A: MAXI/GSC detection
  47. GRB 100725B: Mondy optical upper limit
  48. GRB 100725B: Maidanak optical upper limit
  49. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  50. GRB100807A: R band observations
  51. GRB100823A : MOA optical observation
  52. GRB 100823A: Swift XRT refined analysis
  53. GRB 100823: 1.5m OSN I-band observations
  54. GRB 100823A: Swift/UVOT Upper Limits
  55. GRB 100823A: Swift-BAT refined analysis
  56. GRB 100823A: Enhanced Swift-XRT position
  57. GRB 100823A: Swift detection of a burst
  58. GRB 100814A: Suzaku WAM observation of the prompt emission
  59. GRB 100814A: ISON-NM optical observations
  60. EVLA radio afterglow detection of GRB 100814A
  61. GRB 100814A: optical observations
  62. Konus-Wind observation of GRB 100816A
  63. GRB 100816A: Fermi GBM observation
  64. Konus-Wind observation of GRB 100814A
  65. GRB 100816A: Gemini-N spectroscopy
  66. GRB 100816A: Swift UVOT Observations
  67. GRB100816A Swift-XRT refined analysis
  68. GRB 100816A: Swift-BAT spectral lag results
  69. GRB 100816A: 1.23m CAHA optical observations
  70. GRB 100816A, Swift-BAT refined analysis
  71. GRB 100816A: Enhanced Swift-XRT position
  72. GRB100814A - interesting UVOT lightcurve.
  73. GRB 100816A: TAROT Calern observatory optical detection
  74. GRB100816A: TNG optical afterglow confirmation.
  75. GRB 100816A: ROTSE-III Optical Limits
  76. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  77. Swift-BAT trigger 431756 is not a burst
  78. Swift/UVOT observations of GRB100814A - title correction to GCN 11097
  79. GRB 100814A: Fermi GBM observation
  80. Swift/UVOT Observations of GRB100814A - a clearer table.
  81. GRB 100814A: Swift-XRT refined analysis
  82. Swift/UVOT observations of GRB100814A
  83. GRB 100814A, Swift-BAT refined analysis
  84. GRB 100814A: Enhanced Swift-XRT position
  85. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  86. GRB 100814A: IAC80 R-band observations
  87. GRB 100814A: Swift UVOT observations of the optical afterglow
  88. GRB 100814A: Swift detection of a burst with an optical afterglow
  89. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  90. Swift-BAT trigger 431582 likely is IGR J17464-2811
  91. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  92. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  93. GRB 100807A: P200 Infrared Observations
  94. GRB100807A: optical observation in CrAO
  95. GRB 100805A: optical observation in CrAO
  96. GRB 100807A: Swift XRT refined analysis
  97. GRB 100807A: P60 Optical Afterglow Discovery
  98. GRB 100807A: Swift/UVOT Upper Limits
  99. GRB 100807A: Enhanced Swift-XRT position
  100. GRB 100807A: Swift-BAT refined analysis

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