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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

42185 results found.

  1. GRB 101017A: ROTSE-III Optical Limits
  2. GRB 101017A: Swift detection of a burst with optical counterpart
  3. GRB 101011A: Fermi GBM detection
  4. GRB 101011A: BOOTES-3 Upper Limit
  5. Konus-Wind observation of GRB 101014A
  6. GRB 101014A: Fermi GBM detection
  7. GRB 100906A: D50 optical detection
  8. GRB 100902A: D50 optical limit
  9. GRB 101011A: Swift/UVOT observations
  10. GRB 101011A, GROND upper limits
  11. GRB 101011A: Zadko observatory - Gingin optical observations
  12. GRB 101011A: XRT Refined Analysis
  13. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  14. GRB 101011A: Enhanced Swift-XRT position
  15. GRB 101011A: Swift-BAT refined analysis
  16. GRB 101011A: Swift detection of a burst
  17. GRB 101008A: Fermi GBM observation
  18. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  19. GRB 101008A: MASTER prompt optical observations
  20. GRB 101008A: Swift-BAT refined analysis
  21. GRB101008A, GROND detection of a fading afterglow
  22. GRB 101008A: Swift-XRT refined analysis
  23. GRB 101008A: SAO RAS optical observations
  24. GRB 100915 optical upper limit
  25. GRB 101008: Swift/UVOT Upper Limits
  26. GRB 101008A: Enhanced Swift-XRT position
  27. GRB 101008A: 1.23m CAHA optical observations
  28. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  29. GRB 101008A: Swift detection of a burst
  30. GRB 100728B: X-shooter redshift
  31. Refined analysis shows Swift Trigger 435520 is not a GRB
  32. Swift Trigger 435520 is probably not a GRB
  33. GRB 100925A / MAXI J1659-152: MASTER optical observations
  34. GRB 100924A: Suzaku WAM observation of the prompt emission
  35. GRB 100928A, Swift-BAT refined analysis
  36. GRB 100924A: Fermi GBM observation
  37. GRB 100928A: Swift detection of a burst
  38. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  39. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  40. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  41. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  42. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  43. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  44. GRB 100925A/MAXI J1659-152 - NOT optical observations
  45. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  46. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  47. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  48. GRB100925A UVOT afterglow
  49. GRB 100924A: GROND detection of an optical/NIR afterglow
  50. GRB 100925A: Swift detection of a burst
  51. GRB 100924A: Swift-BAT refined analysis
  52. GRB 100924A: Swift detection of a burst
  53. GRB 100917A: TAROT La Silla observatory optical observations
  54. GRB 100915A: TAROT Calern observatory optical observations
  55. GRB100906A: Ashra-1 observation of early optical emission
  56. GRB 100916A: Fermi GBM detection
  57. GRB 100917A: Swift-BAT refined analysis
  58. GRB 100917A: Swift detection of a burst
  59. GRB100915A: MITSuME Ishigakijima Optical upper limits
  60. GRB 100915B: GRT Optical Observation
  61. GRB 100915A: GRT Optical Observation
  62. GRB 100915B: Fermi GBM observation
  63. GRB 100915A: Correction to Swift-BAT refined analysis
  64. GRB 100915A: Swift-BAT refined analysis
  65. GRB 100915A: Swift-XRT refined analysis
  66. GRB 100915A: Enhanced Swift-XRT position
  67. GRB 100915B: a long GRB detected by INTEGRAL
  68. GRB 100915A: Swift detection of a likely burst
  69. GRB 100910A: Fermi GBM detection
  70. Swift BAT Trigger 433953 probably not a GRB
  71. GRB100909A: MITSuME Ishigakijima Optical upper limits
  72. GRB 100901A: errata of GRB name in GCN 11270
  73. GRB 100901A: optical observations in Mondy and R-light curve
  74. GRB100909A: NOT optical afterglow confirmation
  75. GRB 100909A: Swift-XRT refined analysis
  76. GRB 100906A: optical observations at Mt.Terskol
  77. GRB 100901A: optical observation in Maidanak, break confirmation
  78. GRB 100909A: Faulkes Telescope North afterglow candidate
  79. GRB 100909A: ROTSE-III Optical Limits
  80. GRB 100909A: Planned XMM-Newton observation
  81. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  82. GRB 100909A: Swift target of opportunity observation
  83. GRB 100909A: a long GRB detected by INTEGRAL
  84. GRB100901A: IAO optical upper limits at 4 days after the burst
  85. EVLA detection of radio afterglow of GRB100901A
  86. GRB 100901A: Confirmation of WSRT Radio Detection
  87. GRB 100901A: CrAO optical observations
  88. GRB 100906A: RTT150 optical observations
  89. GRB 100906A: GRAS-007 optical observations
  90. GRB100906A: R band observations
  91. Konus-Wind observation of GRB 100906A
  92. GRB100906A: non-detection at 15GHz
  93. GRB100906A: Optical observations at IAO
  94. GRB 100906A: Fermi GBM observation
  95. GRB 100906A: TLS Monitoring
  96. GRB 100901A: TLS Detection at 5.5 days
  97. GRB 100906A: Observations at the Virtual Telescope
  98. GRB 100906A: Swift-XRT refined analysis
  99. GRB 100906A: Enhanced Swift-XRT position
  100. GRB 100906A: Swift/UVOT Observations

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