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"

32707 results found.

  1. GRB 100917A: Swift-BAT refined analysis
  2. GRB100915A: MITSuME Ishigakijima Optical upper limits
  3. GRB 100915B: GRT Optical Observation
  4. GRB 100915A: GRT Optical Observation
  5. GRB 100915B: Fermi GBM observation
  6. GRB 100915A: Correction to Swift-BAT refined analysis
  7. GRB 100915A: Swift/UVOT Upper Limits
  8. GRB 100915A: Swift-BAT refined analysis
  9. GRB 100915A: Swift-XRT refined analysis
  10. GRB100909A: MITSuME Ishigakijima Optical upper limits
  11. GRB 100909A: Swift/UVOT observations
  12. GRB 100901A: errata of GRB name in GCN 11270
  13. GRB 100901A: optical observations in Mondy and R-light curve
  14. GRB 100909A: Swift-XRT refined analysis
  15. GRB 100906A: optical observations at Mt.Terskol
  16. GRB 100901A: optical observation in Maidanak, break confirmation
  17. GRB 100909A: Faulkes Telescope North afterglow candidate
  18. GRB 100909A: ROTSE-III Optical Limits
  19. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  20. GRB100901A: IAO optical upper limits at 4 days after the burst
  21. EVLA detection of radio afterglow of GRB100901A
  22. GRB 100901A: Confirmation of WSRT Radio Detection
  23. GRB 100901A: CrAO optical observations
  24. GRB 100906A: RTT150 optical observations
  25. GRB 100906A: GRAS-007 optical observations
  26. GRB100906A: R band observations
  27. Konus-Wind observation of GRB 100906A
  28. GRB100906A: Optical observations at IAO
  29. GRB 100906A: Fermi GBM observation
  30. GRB 100906A: TLS Monitoring
  31. GRB 100901A: TLS Detection at 5.5 days
  32. GRB 100906A: Observations at the Virtual Telescope
  33. GRB 100906A: Swift-XRT refined analysis
  34. GRB 100906A: Swift/UVOT Observations
  35. GRB100906A: Errata of MITSuME Okayama about observation time
  36. GRB100906A: MITSuME Okayama Optical Observation
  37. GRB 100906A: Ondrejov 65cm observations
  38. GRB 100906A: TLS Multicolor Observations
  39. GRB 100905A: Swift/UVOT Upper Limits
  40. GRB 100901A: TLS observations, SDSS calibration, decay slope
  41. GRB 100906A: MASTER preliminary prompt+afterglow lc
  42. GRB 100901A: ISON-NM optical observations
  43. GRB 100906A: Swift-BAT refined analysis
  44. GRB 100906A: UKIRT zYJHK Observation
  45. GRB 100906A: MASTER preliminary polarization prompt light curve
  46. GRB 100906A: Gemini-N/GMOS redshift
  47. GRB 100906A : Faulkes Telescope North optical observations
  48. GRB 100906A: MASTER early OT observations
  49. GRB 100829A: MASTER optical observations
  50. GRB100905A: Optical upper limits at IAO
  51. GRB100905A: MITSuME Okayama optical upper limits
  52. GRB 100905A: Swift-XRT refined analysis.
  53. GRB 100905A: UKIRT zJHK Observation
  54. GRB 100901A: Possible WSRT Radio Detection
  55. GRB 100905A: Swift-BAT refined analysis
  56. GRB100904A: BOOTES-3 Upper Limit
  57. GRB 100905A: MASTER Prompt Optical Observations
  58. GRB 100905A: Faulkes Telescope North observations
  59. Optical observations of GRB 100901A
  60. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  61. GRB 100902A: UKIRT JK Observation
  62. GRB 100902A: GROND observations; afterglow candidate
  63. GRB 100901A: UKIRT zYJHK Observation
  64. GRB 100904A: Swift-BAT refined analysis
  65. GRB10901A: Optical observations at IAO
  66. Konus-Wind observation of GRB 100829A
  67. GRB 100902A: Swift-BAT refined analysis
  68. GRB 100901A: optical observation at Mt.Terskol
  69. GRB 100901A: multicolor photometry at Mt.Terskol
  70. GRB 100901A: Lightbuckets Optical Observations
  71. GRB 100901A: HCT optical observations
  72. Tentative redshift of GRB100902A from Swift-XRT data
  73. GRB 100902A: Swift XRT refined analysis
  74. GRB 100902A: Swift/UVOT Upper Limits
  75. GRB 100902A: optical observation at Mt.Terskol
  76. GRB 100901A: optical observation at Mt.Terskol
  77. GRB 100901A: Kanata Telescope observation of the optical afterglow
  78. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  79. GRB 100901A: TLS Observations: Break?
  80. GRB100901A: Errata of MITSuME Okayama about reference catalog
  81. GRB 100902A: MASTER Prompt Optical Observations
  82. GRB 100901A: ISON-NM optical observations
  83. GRB 100902A: Faulkes Telescope South observations
  84. GRB 100902A: MASTER Optical Early Limit
  85. GRB 100901A: ROTSE-III Detection
  86. GRB 100901A: MASTER optical flare at 420s discovery
  87. GRB 100901A: Vega telescope optical afterglow observation
  88. Swift/UVOT Observations of GRB100901A
  89. GRB 100901A : HCT optical observations
  90. GRB 100901A: SARA-N observations
  91. GRB 100901A: THO optical observations
  92. GRB100901A: MITSuME Okayama Optical Observation
  93. GRB 100901A: Swift-XRT Team refined analysis
  94. GRB 100901A - NOT optical observation
  95. GRB 100901A: Swift-BAT refined analysis
  96. GRB 100901A: optical observation at Mt.Terskol
  97. GRB 100901A: optical observation at Mt.Terskol
  98. GRB 100901A: MASTER power low decay
  99. GRB 100901A: Gemini-N Redshift
  100. GRB 100901A: MASTER: the OT brightenning

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