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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"

36347 results found.

  1. GRB 110319A: Swift-BAT refined analysis
  2. GRB 110319A: Swift-XRT refined Analysis
  3. GRB 110318B: GROND upper limits
  4. GRB 110319A: Enhanced Swift-XRT position
  5. GRB 110319A: Swift detection of a burst
  6. GRB 110318B: Swift-XRT refined Analysis
  7. GRB 110318A: Fermi GBM detection
  8. GRB 110318B: Swift-BAT refined analysis
  9. GRB 110318B: Enhanced Swift-XRT position
  10. GRB 110318A: Swift-BAT refined analysis
  11. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  12. GRB 110318B: Swift detection of a burst
  13. GRB 110318A: Swift detection of a burst
  14. Fermi GBM trigger 321944155 (110316205) is not a GRB
  15. GRB 110315A: RTT150 optical observations
  16. GRB 110315A: Swift/UVOT Upper Limits
  17. GRB 110315A: Swift-XRT refined Analysis
  18. GRB 110315A: Swift-BAT refined analysis
  19. GRB 110315A: Enhanced Swift-XRT position
  20. GRB 110315A: MASTER early optical observations
  21. GRB 110315A: Swift detection of a burst
  22. GRB110312A: MITSuME Okayama Optical upper limits
  23. GRB 110312A: RTT150 optical observations
  24. GRB 110312A: Swift/UVOT Upper Limits
  25. GRB 110312A: Swift-XRT refined Analysis
  26. GRB 110312A: GROND Upper Limits
  27. GRB 110312A: Enhanced Swift-XRT position
  28. GRB 110312A: Swift-BAT refined analysis
  29. GRB 110312A: Swift detection of a burst
  30. GRB 110305A: REM detection of a possible NIR afterglow
  31. GRB110305A: MITSuME Ishigakijima Optical upper limits
  32. GRB 110305A: Swift/UVOT Upper Limits
  33. GRB 110305A: Swift-XRT refined Analysis
  34. GRB 110305A: Enhanced Swift-XRT position
  35. GRB 110305A: Swift-BAT refined analysis
  36. IBAS trigger n. 6138 is not a GRB
  37. GRB 110305A: GROND Detection of Optical Afterglow
  38. GRB 110305A: Swift detection of a burst
  39. GRB 110223A: optical upper limits
  40. GRB 110301A: Fermi GBM detection
  41. GRB101225A: early EVLA Observations of Christmas Burst
  42. Swift/UVOT observations of GRB110223A
  43. No IPN GRB detected in conjunction with candidate GRB 110215
  44. GRB GRB 110223A: MASTER VWF early optical observations
  45. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  46. GRB 110223A: Swift-BAT refined analysis
  47. GRB 110223A : early optical limit by "Pi of the Sky"
  48. GRB 110223A: Liverpool Telescope observations
  49. GRB 110223A: Swift-XRT refined Analysis
  50. GRB 110223B: Swift-XRT refined Analysis
  51. GRB 110223A: Enhanced Swift-XRT position
  52. GRB 110223B: Enhanced Swift-XRT position
  53. GRB 110223B: Swift-BAT refined analysis
  54. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  55. GRB 110223A: Observations from BOOTES-2
  56. GRB 110223B: Swift detection of a burst
  57. GRB 110223A: Swift detection of a burst
  58. GRB 101225A, the review of the sky area in plate archives
  59. OT 110215: Further NIR observations from NOT of the GRB candidate
  60. GRB 110213B: Swift/UVOT observations
  61. GRB110213B: X-ray afterglow confirmation
  62. Swift XRT and UVOT Observations of OT 110215
  63. OT 110215: NIR observations from NOT of GRB candidate
  64. GRB 110213A: optical observations in CrAO
  65. GRB 110213B: GROND observations of the optical/NIR afterglow
  66. GRB 110213A: optical observations in Mondy
  67. Fermi GBM trigger 319534757 (110216319) is not a GRB
  68. GRB110205A: EVLA Observations
  69. OT 110215: possible GRB from 2MASS J00264184+8324093
  70. Swift/UVOT observations of GRB110210a.
  71. GRB 110210A: optical upper limit
  72. GRB 110213B: Gemini South Redshift
  73. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  74. GRB 110210A: ROVOR Upper Limit
  75. GRB 110213A: YNAO-GMG Observations
  76. GRB 110213B: P60 Optical Afterglow Candidate
  77. GRB 110213A: TNT optical observations
  78. GRB 110212A: Swift XRT and UVOT observations
  79. GRB 110213A: Fermi GBM observation
  80. GRB 110205A: Konkoly optical observations
  81. GRB 110213B: Swift XRT observation
  82. GRB 110213A: MITSuME Akeno Optical Observation
  83. Konus-Wind observation of GRB 110213A
  84. Konus-Wind observation of GRB 110213B
  85. GRB 110213A: Swift-XRT refined Analysis
  86. GRB 110213B: MAXI/GSC refined analysis
  87. GRB110213A: MITSuME Okayama Optical Observation
  88. GRB 110213A: Swift/UVOT refined analysis
  89. GRB 110213A: THO optical observations
  90. GRB 110213B: MAXI/GSC detection of a probable GRB
  91. GRB 110213A: Lightbuckets Optical Observations
  92. GRB 110213A, Swift-BAT refined analysis
  93. GRB 110213A: optical observations
  94. GRB 110213A: Enhanced Swift-XRT position
  95. GRB110212A: MITSuME Okayama optical upper limits
  96. GRB 110213A: KAIT observations
  97. GRB 110213A: GRAS011 optical observations
  98. GRB 110213A: Bok Telescope Redshift
  99. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  100. GRB 110213A: P60 Optical Afterglow Detection

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