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"

23690 results found.

  1. GRB 101011A: Fermi GBM detection
  2. GRB 101011A: BOOTES-3 Upper Limit
  3. Konus-Wind observation of GRB 101014A
  4. GRB 101014A: Fermi GBM detection
  5. GRB 101011A: Swift/UVOT observations
  6. GRB 101011A, GROND upper limits
  7. GRB 101011A: Zadko observatory - Gingin optical observations
  8. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  9. GRB 101011A: Swift-BAT refined analysis
  10. GRB 101011A: Swift detection of a burst
  11. GRB 101008A: Fermi GBM observation
  12. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  13. GRB 101008A: MASTER prompt optical observations
  14. GRB 101008A: Swift-BAT refined analysis
  15. GRB101008A, GROND detection of a fading afterglow
  16. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  17. GRB 101008A: Swift detection of a burst
  18. GRB 100925A / MAXI J1659-152: MASTER optical observations
  19. GRB 100924A: Suzaku WAM observation of the prompt emission
  20. GRB 100928A, Swift-BAT refined analysis
  21. GRB 100928A: Swift detection of a burst
  22. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  23. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  24. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  25. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  26. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  27. GRB 100924A: GROND detection of an optical/NIR afterglow
  28. GRB 100924A: Swift-BAT refined analysis
  29. GRB 100917A: TAROT La Silla observatory optical observations
  30. GRB 100915A: TAROT Calern observatory optical observations
  31. GRB 100917A: Swift-BAT refined analysis
  32. GRB 100917A: Swift detection of a burst
  33. GRB100915A: MITSuME Ishigakijima Optical upper limits
  34. GRB 100915A: Swift/UVOT Upper Limits
  35. GRB 100915A: Swift-BAT refined analysis
  36. GRB 100915A: Swift-XRT refined analysis
  37. GRB 100915B: a long GRB detected by INTEGRAL
  38. GRB 100915A: Swift detection of a likely burst
  39. GRB 100910A: Fermi GBM detection
  40. Swift BAT Trigger 433953 probably not a GRB
  41. GRB100909A: MITSuME Ishigakijima Optical upper limits
  42. GRB 100909A: Swift/UVOT observations
  43. GRB 100901A: optical observations in Mondy and R-light curve
  44. GRB 100909A: Swift-XRT refined analysis
  45. GRB 100906A: optical observations at Mt.Terskol
  46. GRB 100901A: optical observation in Maidanak, break confirmation
  47. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  48. GRB 100909A: Swift target of opportunity observation
  49. GRB 100909A: a long GRB detected by INTEGRAL
  50. GRB100901A: IAO optical upper limits at 4 days after the burst
  51. GRB 100901A: Confirmation of WSRT Radio Detection
  52. GRB 100906A: RTT150 optical observations
  53. Konus-Wind observation of GRB 100906A
  54. GRB100906A: Optical observations at IAO
  55. GRB 100906A: Swift/UVOT Observations
  56. GRB100906A: Errata of MITSuME Okayama about observation time
  57. GRB100906A: MITSuME Okayama Optical Observation
  58. GRB 100905A: Swift/UVOT Upper Limits
  59. GRB 100906A: MASTER preliminary prompt+afterglow lc
  60. GRB 100901A: ISON-NM optical observations
  61. GRB 100906A: Swift-BAT refined analysis
  62. GRB 100906A: MASTER preliminary polarization prompt light curve
  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-BAT refined analysis
  69. GRB 100905A: MASTER Prompt Optical Observations
  70. GRB 100905A: Swift detection of a burst
  71. Optical observations of GRB 100901A
  72. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  73. GRB 100904A: Swift-BAT refined analysis
  74. GRB100902A: Optical upper limits at IAO
  75. GRB10901A: Optical observations at IAO
  76. Konus-Wind observation of GRB 100829A
  77. GRB 100904A: Swift detection of a burst
  78. GRB 100902A: Swift-BAT refined analysis
  79. GRB 100901A: optical observation at Mt.Terskol
  80. GRB 100901A: multicolor photometry at Mt.Terskol
  81. IPN Triangulation of the very bright GRB 100829A
  82. GRB 100902A: optical observation at Mt.Terskol
  83. GRB 100901A: optical observation at Mt.Terskol
  84. GRB 100901A: Kanata Telescope observation of the optical afterglow
  85. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  86. GRB 100902A: Enhanced Swift-XRT position
  87. GRB100901A: Errata of MITSuME Okayama about reference catalog
  88. GRB 100902A: MASTER Prompt Optical Observations
  89. GRB 100901A: ISON-NM optical observations
  90. GRB 100902A: Faulkes Telescope South observations
  91. GRB 100902A: MASTER Optical Early Limit
  92. GRB 100902A: Swift detection of a burst
  93. GRB 100901A: MASTER optical flare at 420s discovery
  94. GRB100901A: MITSuME Okayama 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