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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"

37993 results found.

  1. GRB 101020A: MASTER prompt and afterglow limit
  2. GRB 101020A: BOOTES2 follow-up and limit
  3. GRB 101020A: MASTER polarization optical observations
  4. GRB 101020A, Swift-BAT refined analysis
  5. GRB 101020A: Swift detection of a burst
  6. GRB 101017A: miniTAO/ANIR NIR upper limits
  7. GRB 101017A: Swift XRT refined analysis
  8. GRB 101017A: Swift/UVOT Observations
  9. GRB 101008A: correction to the GCN 11352
  10. GRB 101008A: optical observations
  11. GRB101017A: MITSuME Okayama optical upper limits
  12. Konus-Wind observation of GRB 101017A
  13. GRB 101014A: Fermi LAT detection
  14. GRB 101017A: Enhanced Swift-XRT position
  15. GRB 101017A: Swift-BAT refined analysis
  16. GRB 101017A: ROTSE-III Optical Limits
  17. GRB 101017A: Swift detection of a burst with optical counterpart
  18. GRB 101011A: Fermi GBM detection
  19. GRB 101011A: BOOTES-3 Upper Limit
  20. Konus-Wind observation of GRB 101014A
  21. GRB 101014A: Fermi GBM detection
  22. GRB 100906A: D50 optical detection
  23. GRB 100902A: D50 optical limit
  24. GRB 101011A: Swift/UVOT observations
  25. GRB 101011A, GROND upper limits
  26. GRB 101011A: Zadko observatory - Gingin optical observations
  27. GRB 101011A: XRT Refined Analysis
  28. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  29. GRB 101011A: Enhanced Swift-XRT position
  30. GRB 101011A: Swift-BAT refined analysis
  31. GRB 101011A: Swift detection of a burst
  32. GRB 101008A: Fermi GBM observation
  33. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  34. GRB 101008A: MASTER prompt optical observations
  35. GRB 101008A: Swift-BAT refined analysis
  36. GRB101008A, GROND detection of a fading afterglow
  37. GRB 101008A: Swift-XRT refined analysis
  38. GRB 101008A: SAO RAS optical observations
  39. GRB 100915 optical upper limit
  40. GRB 101008: Swift/UVOT Upper Limits
  41. GRB 101008A: Enhanced Swift-XRT position
  42. GRB 101008A: 1.23m CAHA optical observations
  43. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  44. GRB 101008A: Swift detection of a burst
  45. GRB 100728B: X-shooter redshift
  46. Refined analysis shows Swift Trigger 435520 is not a GRB
  47. Swift Trigger 435520 is probably not a GRB
  48. GRB 100925A / MAXI J1659-152: MASTER optical observations
  49. GRB 100924A: Suzaku WAM observation of the prompt emission
  50. GRB 100928A, Swift-BAT refined analysis
  51. GRB 100924A: Fermi GBM observation
  52. GRB 100928A: Swift detection of a burst
  53. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  54. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  55. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  56. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  57. GRB 100925A / MAXI J1659-152: SARA-S Observations
  58. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  59. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  60. GRB 100925A/MAXI J1659-152 - NOT optical observations
  61. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  62. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  63. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  64. GRB100925A UVOT afterglow
  65. GRB 100924A: GROND detection of an optical/NIR afterglow
  66. GRB 100925A: Swift detection of a burst
  67. GRB 100924A: Swift-BAT refined analysis
  68. GRB 100924A: Swift detection of a burst
  69. GRB 100917A: TAROT La Silla observatory optical observations
  70. GRB 100915A: TAROT Calern observatory optical observations
  71. GRB100906A: Ashra-1 observation of early optical emission
  72. GRB 100916A: Fermi GBM detection
  73. GRB 100917A: Swift-BAT refined analysis
  74. GRB 100917A: Swift detection of a burst
  75. GRB100915A: MITSuME Ishigakijima Optical upper limits
  76. GRB 100915B: GRT Optical Observation
  77. GRB 100915A: GRT Optical Observation
  78. GRB 100915B: Fermi GBM observation
  79. GRB 100915A: Correction to Swift-BAT refined analysis
  80. GRB 100915A: Swift/UVOT Upper Limits
  81. GRB 100915A: Swift-BAT refined analysis
  82. GRB 100915A: Swift-XRT refined analysis
  83. GRB 100915A: Enhanced Swift-XRT position
  84. GRB 100915B: a long GRB detected by INTEGRAL
  85. GRB 100915A: Swift detection of a likely burst
  86. GRB 100910A: Fermi GBM detection
  87. Swift-BAT trigger 433953 is not a burst
  88. Swift BAT Trigger 433953 probably not a GRB
  89. GRB100909A: MITSuME Ishigakijima Optical upper limits
  90. GRB 100909A: Swift/UVOT observations
  91. GRB 100901A: errata of GRB name in GCN 11270
  92. GRB 100901A: optical observations in Mondy and R-light curve
  93. GRB 100909A: Swift-XRT refined analysis
  94. GRB 100906A: optical observations at Mt.Terskol
  95. GRB 100901A: optical observation in Maidanak, break confirmation
  96. GRB 100909A: Faulkes Telescope North afterglow candidate
  97. GRB 100909A: ROTSE-III Optical Limits
  98. GRB 100909A: Planned XMM-Newton observation
  99. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  100. GRB 100909A: Swift target of opportunity observation

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