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"

19666 results found.

  1. GRB 100915 optical upper limit
  2. GRB 101008: Swift/UVOT Upper Limits
  3. GRB 101008A: Enhanced Swift-XRT position
  4. GRB 101008A: 1.23m CAHA optical observations
  5. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  6. GRB 101008A: Swift detection of a burst
  7. Refined analysis shows Swift Trigger 435520 is not a GRB
  8. Swift Trigger 435520 is probably not a GRB
  9. GRB 100924A: Suzaku WAM observation of the prompt emission
  10. GRB 100928A, Swift-BAT refined analysis
  11. GRB 100924A: Fermi GBM observation
  12. GRB 100928A: Swift detection of a burst
  13. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  14. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  15. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  16. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  17. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  18. GRB100925A UVOT afterglow
  19. GRB 100924A: GROND detection of an optical/NIR afterglow
  20. GRB 100925A: Swift detection of a burst
  21. GRB 100924A: Swift-BAT refined analysis
  22. GRB 100924A: Swift detection of a burst
  23. GRB 100917A: TAROT La Silla observatory optical observations
  24. GRB 100915A: TAROT Calern observatory optical observations
  25. GRB100906A: Ashra-1 observation of early optical emission
  26. GRB 100917A: Swift-BAT refined analysis
  27. GRB 100917A: Swift detection of a burst
  28. GRB 100915A: GRT Optical Observation
  29. GRB 100915A: Correction to Swift-BAT refined analysis
  30. GRB 100915A: Swift/UVOT Upper Limits
  31. GRB 100915A: Swift-BAT refined analysis
  32. GRB 100915A: Swift-XRT refined analysis
  33. GRB 100915A: Enhanced Swift-XRT position
  34. GRB 100915A: Swift detection of a likely burst
  35. Swift-BAT trigger 433953 is not a burst
  36. Swift BAT Trigger 433953 probably not a GRB
  37. GRB 100909A: Swift/UVOT observations
  38. GRB 100901A: optical observations in Mondy and R-light curve
  39. GRB 100909A: Swift-XRT refined analysis
  40. GRB 100906A: optical observations at Mt.Terskol
  41. GRB 100901A: optical observation in Maidanak, break confirmation
  42. GRB 100909A: Faulkes Telescope North afterglow candidate
  43. GRB 100909A: ROTSE-III Optical Limits
  44. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  45. GRB 100909A: Swift target of opportunity observation
  46. EVLA detection of radio afterglow of GRB100901A
  47. GRB 100901A: CrAO optical observations
  48. GRB100906A: R band observations
  49. Konus-Wind observation of GRB 100906A
  50. GRB 100906A: Fermi GBM observation
  51. GRB 100901A: TLS Detection at 5.5 days
  52. GRB 100906A: Swift-XRT refined analysis
  53. GRB 100906A: Enhanced Swift-XRT position
  54. GRB 100906A: Swift/UVOT Observations
  55. GRB 100906A: TLS Multicolor Observations
  56. GRB 100905A: Swift/UVOT Upper Limits
  57. GRB 100901A: ISON-NM optical observations
  58. GRB 100906A: Swift-BAT refined analysis
  59. GRB 100906A: MASTER preliminary polarization prompt light curve
  60. GRB 100906A : Faulkes Telescope North optical observations
  61. GRB 100906A: MASTER early OT observations
  62. GRB 100906A: Swift detection of a burst with an optical afterglow
  63. GRB 100905A: Swift-XRT refined analysis.
  64. GRB 100905A: Enhanced Swift-XRT position
  65. GRB 100905A: Swift-BAT refined analysis
  66. GRB100904A: BOOTES-3 Upper Limit
  67. GRB 100905A: MASTER Prompt Optical Observations
  68. GRB 100905A: Faulkes Telescope North observations
  69. GRB 100905A: Swift detection of a burst
  70. GRB 100904A: Swift-BAT refined analysis
  71. GRB 100904A: Swift detection of a burst
  72. GRB 100902A: Swift-BAT refined analysis
  73. GRB 100901A: optical observation at Mt.Terskol
  74. GRB 100901A: multicolor photometry at Mt.Terskol
  75. IPN Triangulation of the very bright GRB 100829A
  76. GRB 100901A: Lightbuckets Optical Observations
  77. GRB 100902A: 1.5m OSN I-band Upper Limits
  78. Tentative redshift of GRB100902A from Swift-XRT data
  79. GRB 100902A: Swift XRT refined analysis
  80. GRB 100902A: Swift/UVOT Upper Limits
  81. GRB 100902A: optical observation at Mt.Terskol
  82. GRB 100901A: optical observation at Mt.Terskol
  83. GRB 100902A: Enhanced Swift-XRT position
  84. GRB 100901A: TLS Observations: Break?
  85. GRB 100902A: MASTER Prompt Optical Observations
  86. GRB 100901A: ISON-NM optical observations
  87. GRB 100902A: MASTER Optical Early Limit
  88. GRB 100902A: Swift detection of a burst
  89. GRB 100901A: 1.5m OSN BVRI-band observations.
  90. GRB 100901A: ROTSE-III Detection
  91. Swift/UVOT Observations of GRB100901A
  92. GRB 100901A: Swift-XRT Team refined analysis
  93. GRB 100901A: Swift-BAT refined analysis
  94. GRB 100901A: optical observation at Mt.Terskol
  95. GRB 100901A: Enhanced Swift-XRT position
  96. GRB 100901A: optical observation at Mt.Terskol
  97. GRB 100901A: MASTER power low decay
  98. GRB 100901A: MASTER: the OT brightenning
  99. GRB 100901A: confirmation of the afterglow
  100. GRB 100901A: MASTER Optical Early Limits

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