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"

45570 results found.

  1. GRB 100916A: Fermi GBM detection
  2. GRB 100917A: Swift-BAT refined analysis
  3. GRB 100917A: Swift detection of a burst
  4. GRB100915A: MITSuME Ishigakijima Optical upper limits
  5. GRB 100915B: GRT Optical Observation
  6. GRB 100915A: GRT Optical Observation
  7. GRB 100915B: Fermi GBM observation
  8. GRB 100915A: Correction to Swift-BAT refined analysis
  9. GRB 100915A: Swift/UVOT Upper Limits
  10. GRB 100915A: Swift-BAT refined analysis
  11. GRB 100915A: Swift-XRT refined analysis
  12. GRB 100915A: Enhanced Swift-XRT position
  13. GRB 100915B: a long GRB detected by INTEGRAL
  14. GRB 100915A: Swift detection of a likely burst
  15. GRB 100910A: Fermi GBM detection
  16. Swift-BAT trigger 433953 is not a burst
  17. Swift BAT Trigger 433953 probably not a GRB
  18. GRB100909A: MITSuME Ishigakijima Optical upper limits
  19. GRB 100909A: Swift/UVOT observations
  20. GRB 100901A: errata of GRB name in GCN 11270
  21. GRB 100901A: optical observations in Mondy and R-light curve
  22. GRB100909A: NOT optical afterglow confirmation
  23. GRB 100909A: Swift-XRT refined analysis
  24. GRB 100906A: optical observations at Mt.Terskol
  25. GRB 100901A: optical observation in Maidanak, break confirmation
  26. GRB 100909A: Faulkes Telescope North afterglow candidate
  27. GRB 100909A: ROTSE-III Optical Limits
  28. GRB 100909A: Planned XMM-Newton observation
  29. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  30. GRB 100909A: Swift target of opportunity observation
  31. GRB 100909A: a long GRB detected by INTEGRAL
  32. GRB100906A: detection at 15GHz
  33. GRB100901A: IAO optical upper limits at 4 days after the burst
  34. EVLA detection of radio afterglow of GRB100901A
  35. GRB 100901A: Confirmation of WSRT Radio Detection
  36. GRB 100901A: CrAO optical observations
  37. GRB 100906A: RTT150 optical observations
  38. GRB 100906A: GRAS-007 optical observations
  39. GRB100906A: R band observations
  40. Konus-Wind observation of GRB 100906A
  41. GRB100906A: non-detection at 15GHz
  42. GRB100906A: Optical observations at IAO
  43. GRB 100906A: Fermi GBM observation
  44. GRB 100906A: TLS Monitoring
  45. GRB 100901A: TLS Detection at 5.5 days
  46. GRB 100906A: Observations at the Virtual Telescope
  47. GRB 100906A: Swift-XRT refined analysis
  48. GRB 100906A: Enhanced Swift-XRT position
  49. GRB 100906A: Swift/UVOT Observations
  50. GRB100906A: Errata of MITSuME Okayama about observation time
  51. GRB100906A: MITSuME Okayama Optical Observation
  52. GRB 100906A: Ondrejov 65cm observations
  53. GRB 100906A: TLS Multicolor Observations
  54. GRB 100905A: Swift/UVOT Upper Limits
  55. GRB 100901A: TLS observations, SDSS calibration, decay slope
  56. GRB 100906A: MASTER preliminary prompt+afterglow lc
  57. GRB 100901A: ISON-NM optical observations
  58. GRB 100906A: Swift-BAT refined analysis
  59. GRB 100906A: UKIRT zYJHK Observation
  60. GRB 100906A: MASTER preliminary polarization prompt light curve
  61. GRB 100906A: Gemini-N/GMOS redshift
  62. GRB 100906A : Faulkes Telescope North optical observations
  63. GRB 100906A: MASTER early OT observations
  64. GRB 100906A: Swift detection of a burst with an optical afterglow
  65. GRB 100829A: MASTER optical observations
  66. GRB100905A: Optical upper limits at IAO
  67. GRB100905A: MITSuME Okayama optical upper limits
  68. GRB 100905A: Swift-XRT refined analysis.
  69. GRB 100905A: UKIRT zJHK Observation
  70. GRB 100901A: Possible WSRT Radio Detection
  71. GRB100905A: 1.5m OSN upper limit
  72. GRB 100905A: Enhanced Swift-XRT position
  73. GRB 100905A: Swift-BAT refined analysis
  74. GRB100904A: BOOTES-3 Upper Limit
  75. GRB 100905A: MASTER Prompt Optical Observations
  76. GRB 100905A: Faulkes Telescope North observations
  77. GRB 100905A: Swift detection of a burst
  78. Optical observations of GRB 100901A
  79. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  80. GRB 100901A: Submm observations from SMA
  81. GRB 100902A: UKIRT JK Observation
  82. GRB 100902A: GROND observations; afterglow candidate
  83. GRB 100901A: UKIRT zYJHK Observation
  84. GRB 100904A: Swift-BAT refined analysis
  85. GRB100902A: Optical upper limits at IAO
  86. GRB10901A: Optical observations at IAO
  87. Konus-Wind observation of GRB 100829A
  88. GRB 100904A: Swift detection of a burst
  89. GRB 100902A: Swift-BAT refined analysis
  90. GRB 100901A: optical observation at Mt.Terskol
  91. GRB 100901A: multicolor photometry at Mt.Terskol
  92. IPN Triangulation of the very bright GRB 100829A
  93. GRB 100901A: Lightbuckets Optical Observations
  94. GRB 100901A: HCT optical observations
  95. GRB 100902A: 1.5m OSN I-band Upper Limits
  96. Tentative redshift of GRB100902A from Swift-XRT data
  97. GRB 100902A: Swift XRT refined analysis
  98. GRB 100902A: Swift/UVOT Upper Limits
  99. GRB 100902A: optical observation at Mt.Terskol
  100. GRB 100901A: optical observation at Mt.Terskol

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