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"

45929 results found.

  1. GRB 100906A: TLS Monitoring
  2. GRB 100901A: TLS Detection at 5.5 days
  3. GRB 100906A: Observations at the Virtual Telescope
  4. GRB 100906A: Swift-XRT refined analysis
  5. GRB 100906A: Enhanced Swift-XRT position
  6. GRB 100906A: Swift/UVOT Observations
  7. GRB100906A: Errata of MITSuME Okayama about observation time
  8. GRB100906A: MITSuME Okayama Optical Observation
  9. GRB 100906A: Ondrejov 65cm observations
  10. GRB 100906A: TLS Multicolor Observations
  11. GRB 100905A: Swift/UVOT Upper Limits
  12. GRB 100901A: TLS observations, SDSS calibration, decay slope
  13. GRB 100906A: MASTER preliminary prompt+afterglow lc
  14. GRB 100901A: ISON-NM optical observations
  15. GRB 100906A: Swift-BAT refined analysis
  16. GRB 100906A: UKIRT zYJHK Observation
  17. GRB 100906A: MASTER preliminary polarization prompt light curve
  18. GRB 100906A: Gemini-N/GMOS redshift
  19. GRB 100906A : Faulkes Telescope North optical observations
  20. GRB 100906A: MASTER early OT observations
  21. GRB 100906A: Swift detection of a burst with an optical afterglow
  22. GRB 100829A: MASTER optical observations
  23. GRB100905A: Optical upper limits at IAO
  24. GRB100905A: MITSuME Okayama optical upper limits
  25. GRB 100905A: Swift-XRT refined analysis.
  26. GRB 100905A: UKIRT zJHK Observation
  27. GRB 100901A: Possible WSRT Radio Detection
  28. GRB100905A: 1.5m OSN upper limit
  29. GRB 100905A: Enhanced Swift-XRT position
  30. GRB 100905A: Swift-BAT refined analysis
  31. GRB100904A: BOOTES-3 Upper Limit
  32. GRB 100905A: MASTER Prompt Optical Observations
  33. GRB 100905A: Faulkes Telescope North observations
  34. GRB 100905A: Swift detection of a burst
  35. Optical observations of GRB 100901A
  36. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  37. GRB 100901A: Submm observations from SMA
  38. GRB 100902A: UKIRT JK Observation
  39. GRB 100902A: GROND observations; afterglow candidate
  40. GRB 100901A: UKIRT zYJHK Observation
  41. GRB 100904A: Swift-BAT refined analysis
  42. GRB100902A: Optical upper limits at IAO
  43. GRB10901A: Optical observations at IAO
  44. Konus-Wind observation of GRB 100829A
  45. GRB 100904A: Swift detection of a burst
  46. GRB 100902A: Swift-BAT refined analysis
  47. GRB 100901A: optical observation at Mt.Terskol
  48. GRB 100901A: multicolor photometry at Mt.Terskol
  49. IPN Triangulation of the very bright GRB 100829A
  50. GRB 100901A: Lightbuckets Optical Observations
  51. GRB 100901A: HCT optical observations
  52. GRB 100902A: 1.5m OSN I-band Upper Limits
  53. Tentative redshift of GRB100902A from Swift-XRT data
  54. GRB 100902A: Swift XRT refined analysis
  55. GRB 100902A: Swift/UVOT Upper Limits
  56. GRB 100902A: optical observation at Mt.Terskol
  57. GRB 100901A: optical observation at Mt.Terskol
  58. GRB 100901A: Kanata Telescope observation of the optical afterglow
  59. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  60. GRB 100902A: Enhanced Swift-XRT position
  61. GRB 100901A: TLS Observations: Break?
  62. GRB100901A: Errata of MITSuME Okayama about reference catalog
  63. GRB 100902A: MASTER Prompt Optical Observations
  64. GRB 100901A: ISON-NM optical observations
  65. GRB 100902A: Faulkes Telescope South observations
  66. GRB 100902A: MASTER Optical Early Limit
  67. GRB 100902A: Swift detection of a burst
  68. GRB 100901A: 1.5m OSN BVRI-band observations.
  69. GRB 100901A: ROTSE-III Detection
  70. GRB 100901A: MASTER optical flare at 420s discovery
  71. GRB 100901A: Vega telescope optical afterglow observation
  72. Swift/UVOT Observations of GRB100901A
  73. GRB 100901A : HCT optical observations
  74. GRB 100901A: SARA-N observations
  75. GRB 100901A: THO optical observations
  76. GRB100901A: MITSuME Okayama Optical Observation
  77. GRB 100901A: Swift-XRT Team refined analysis
  78. GRB 100901A - NOT optical observation
  79. GRB 100901A: Swift-BAT refined analysis
  80. GRB 100901A: optical observation at Mt.Terskol
  81. GRB 100901A: Enhanced Swift-XRT position
  82. GRB 100901A: optical observation at Mt.Terskol
  83. GRB 100901A: MASTER power low decay
  84. GRB 100901A: Gemini-N Redshift
  85. GRB 100901A: MASTER: the OT brightenning
  86. GRB 100901A: confirmation of the afterglow
  87. GRB 100901A: MASTER Optical Early Limits
  88. GRB 100901A: Faulkes Telescope North afterglow candidate
  89. GRB 100901A: Swift detection of a burst with an optical afterglow
  90. Konus-Wind observation of GRB 100826A
  91. GRB 100829.9: MASTER Optical Limits
  92. IPN triangulation of GRB 100826A
  93. GRB100826A: Fermi-LAT Observations
  94. GRB 100823A: optical upper limit
  95. GRB 100814A: Maidanak optical observations
  96. GRB 100823A: optical observations
  97. GRB 100823A: MAXI/GSC detection
  98. GRB 100725B: Mondy optical upper limit
  99. GRB 100725B: Maidanak optical upper limit
  100. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission

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