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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"

28130 results found.

  1. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  2. GRB 101008A: Swift detection of a burst
  3. GRB 100728B: X-shooter redshift
  4. Refined analysis shows Swift Trigger 435520 is not a GRB
  5. Swift Trigger 435520 is probably not a GRB
  6. GRB 100928A: Swift detection of a burst
  7. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  8. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  9. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  10. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  11. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  12. GRB100925A UVOT afterglow
  13. GRB 100924A: GROND detection of an optical/NIR afterglow
  14. GRB 100925A: Swift detection of a burst
  15. GRB 100924A: Swift detection of a burst
  16. GRB 100916A: Fermi GBM detection
  17. GRB 100917A: Swift detection of a burst
  18. GRB100915A: MITSuME Ishigakijima Optical upper limits
  19. GRB 100915B: GRT Optical Observation
  20. GRB 100915A: GRT Optical Observation
  21. GRB 100915A: Swift/UVOT Upper Limits
  22. GRB 100915A: Swift-XRT refined analysis
  23. GRB 100915A: Enhanced Swift-XRT position
  24. GRB 100915A: Swift detection of a likely burst
  25. GRB 100910A: Fermi GBM detection
  26. Swift-BAT trigger 433953 is not a burst
  27. Swift BAT Trigger 433953 probably not a GRB
  28. GRB100909A: MITSuME Ishigakijima Optical upper limits
  29. GRB 100909A: Swift/UVOT observations
  30. GRB 100901A: optical observations in Mondy and R-light curve
  31. GRB100909A: NOT optical afterglow confirmation
  32. GRB 100909A: Swift-XRT refined analysis
  33. GRB 100906A: optical observations at Mt.Terskol
  34. GRB 100901A: optical observation in Maidanak, break confirmation
  35. GRB 100909A: Faulkes Telescope North afterglow candidate
  36. GRB 100909A: ROTSE-III Optical Limits
  37. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  38. GRB 100909A: Swift target of opportunity observation
  39. GRB 100909A: a long GRB detected by INTEGRAL
  40. GRB100906A: detection at 15GHz
  41. GRB100901A: IAO optical upper limits at 4 days after the burst
  42. EVLA detection of radio afterglow of GRB100901A
  43. GRB 100901A: Confirmation of WSRT Radio Detection
  44. GRB 100901A: CrAO optical observations
  45. GRB 100906A: RTT150 optical observations
  46. GRB 100906A: GRAS-007 optical observations
  47. GRB100906A: R band observations
  48. GRB100906A: non-detection at 15GHz
  49. GRB100906A: Optical observations at IAO
  50. GRB 100906A: TLS Monitoring
  51. GRB 100901A: TLS Detection at 5.5 days
  52. GRB 100906A: Observations at the Virtual Telescope
  53. GRB 100906A: Swift-XRT refined analysis
  54. GRB 100906A: Enhanced Swift-XRT position
  55. GRB 100906A: Swift/UVOT Observations
  56. GRB100906A: MITSuME Okayama Optical Observation
  57. GRB 100906A: TLS Multicolor Observations
  58. GRB 100905A: Swift/UVOT Upper Limits
  59. GRB 100901A: TLS observations, SDSS calibration, decay slope
  60. GRB 100906A: MASTER preliminary prompt+afterglow lc
  61. GRB 100901A: ISON-NM optical observations
  62. GRB 100906A: UKIRT zYJHK Observation
  63. GRB 100906A: Gemini-N/GMOS redshift
  64. GRB 100906A: Swift detection of a burst with an optical afterglow
  65. GRB100905A: Optical upper limits at IAO
  66. GRB100905A: MITSuME Okayama optical upper limits
  67. GRB 100905A: Swift-XRT refined analysis.
  68. GRB 100905A: UKIRT zJHK Observation
  69. GRB 100901A: Possible WSRT Radio Detection
  70. GRB100905A: 1.5m OSN upper limit
  71. GRB 100905A: Enhanced Swift-XRT position
  72. GRB 100905A: MASTER Prompt Optical Observations
  73. GRB 100905A: Faulkes Telescope North observations
  74. GRB 100905A: Swift detection of a burst
  75. Optical observations of GRB 100901A
  76. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  77. GRB 100901A: Submm observations from SMA
  78. GRB 100902A: UKIRT JK Observation
  79. GRB 100902A: GROND observations; afterglow candidate
  80. GRB 100901A: UKIRT zYJHK Observation
  81. GRB100902A: Optical upper limits at IAO
  82. GRB10901A: Optical observations at IAO
  83. GRB 100904A: Swift detection of a burst
  84. GRB 100901A: optical observation at Mt.Terskol
  85. GRB 100901A: multicolor photometry at Mt.Terskol
  86. GRB 100901A: Lightbuckets Optical Observations
  87. GRB 100901A: HCT optical observations
  88. GRB 100902A: 1.5m OSN I-band Upper Limits
  89. Tentative redshift of GRB100902A from Swift-XRT data
  90. GRB 100902A: Swift XRT refined analysis
  91. GRB 100902A: Swift/UVOT Upper Limits
  92. GRB 100902A: optical observation at Mt.Terskol
  93. GRB 100901A: optical observation at Mt.Terskol
  94. GRB 100901A: Kanata Telescope observation of the optical afterglow
  95. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  96. GRB 100902A: Enhanced Swift-XRT position
  97. GRB 100901A: TLS Observations: Break?
  98. GRB 100902A: MASTER Prompt Optical Observations
  99. GRB 100901A: ISON-NM optical observations
  100. GRB 100902A: Faulkes Telescope South observations

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