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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"

28234 results found.

  1. GRB 090126A: Swift-XRT Refined Analysis
  2. GRB 090126B: Fermi GBM detection
  3. GRB 090126: SuperAGILE Localization of a Long GRB
  4. GRB 090118: no afterglow candidate
  5. GRB 090123: GROND detection
  6. 1E1547.0-5408: Swift detection of dust halo
  7. GRB 090123: Swift XRT refined analysis
  8. GRB 090123: Swift/UVOT Observations
  9. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  10. GRB 090123: Swift-BAT refined analysis
  11. GRB090123: Enhanced Swift-XRT position
  12. GRB 090123: Swift detection of a burst
  13. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  14. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  15. GRB 090117C: Suzaku WAM observation of the prompt emission
  16. Trigger 340734: Swift detection of a possible short burst
  17. GRB 090118: Subaru NIR Observation
  18. GRB 090118: KPNO 4m 2nd Epoch Observations
  19. GRB 090118 (BATSS): GRT Optical Observation
  20. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  21. GRB 090118: Swift-XRT observations
  22. GRB090118 Swift/UVOT upper limits
  23. GRB 090118: GROND Upper Limits
  24. GRB 090118: Possible burst detection from Swift-BAT slew data
  25. GRB 090117B : Fermi GBM detection
  26. GRB 090117C - Fermi GRB Detection
  27. GRB 090117 - Fermi GBM Observations
  28. GRB 090117: GROND Upper Limits
  29. GRB090117 Swift/UVOT upper limits
  30. GRB090117: Swift-XRT detection of a possible candidate afterglow
  31. GRB 090117 - SuperAGILE Localization of a long GRB
  32. GRB 090112B: Suzaku WAM observation of the prompt emission
  33. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  34. GRB 090113: Swift UVOT upper limits
  35. GRB 090113: GROND Upper Limits
  36. GRB 090113: Swift-XRT refined analysis
  37. GRB 090113: Observations from NOT
  38. GRB 090113: Enhanced Swift-XRT position
  39. GRB 090113: Swift-BAT refined analysis
  40. GRB 090113: ROTSE-III Optical Limits
  41. GRB 090112B: Fermi GBM Detection
  42. GRB 090113: Swift detection of a burst
  43. GRB 090112: Fermi GBM detection
  44. GRB 090109: Fermi GBM detection
  45. GRB 090108B: Fermi GBM detection
  46. GRB 090111, Swift-BAT refined analysis
  47. GRB 090111: Swift UVOT Upper Limits
  48. GRB 090108: Fermi GBM Detection
  49. GRB 090111: Swift-XRT refined analysis
  50. GRB 090111: Enhanced Swift-XRT position
  51. GRB 090111: Swift detection of a burst
  52. GRB 090107B: Suzaku WAM observation of the prompt emission
  53. GRB090107B: Fermi GBM Detection
  54. GRB 090107B: Swift XRT afterglow confirmation
  55. GRB 090107B: Swift/UVOT Observations
  56. GRB 090107B: Swift-XRT detection of possible afterglow
  57. GRB 090107B: a long GRB localized by INTEGRAL
  58. Fermi/GBM detection of GRB 081226A
  59. Fermi/GBM detection of GRB 081225
  60. GRB 090107: Swift-BAT refined analysis
  61. GRB 081231: Fermi GBM Detection
  62. VLA radio upper limit on GRB 090102
  63. GRB 090102: GRT Optical Observation
  64. Swift triggered on the HMXB 1A 1118-61
  65. GRB 081229: Fermi GBM detection
  66. GRB 090102: P60 Imaging and P200 Spectroscopy
  67. GRB 090102 Observations from IAC80
  68. GRB 090102: GROND observations of the optical afterglow
  69. GRB 090102: Swift-BAT refined analysis
  70. GRB 090102: Swift XRT refined analysis
  71. GRB 090102: NOT redshift
  72. GRB 090102: Enhanced Swift-XRT position
  73. GRB 090102: REM observations of a bright afterglow
  74. GRB 090102: Swift detection of a burst with an optical counterpart
  75. GRB 090102: TAROT Calern observatory optical observations
  76. GRB 081230: GROND confirmation of the afterglow
  77. GRB 081230, Swift-BAT refined analysis
  78. GRB081230: Swift-XRT refined analysis
  79. GRB 081230 Swift/UVOT Observations
  80. GRB 081230: Enhanced Swift-XRT position
  81. GRB 081230: ROTSE-III Detection of Optical Counterpart
  82. GRB 081230: Swift detection of a burst
  83. GRB 081226C: Fermi GBM detection
  84. GRB 081228, Swift-BAT refined analysis
  85. VLA radio detection of GRB 081221
  86. GRB 081228: Swift/UVOT Upper Limits
  87. GRB 081228: Swift-XRT Team refined analysis
  88. GRB 081228: detection by GROND
  89. GRB 081228: Enhanced Swift-XRT position
  90. GRB 081228: TAROT Calern observatory optical observations
  91. GRB 081228: Swift detection of a burst
  92. VLA radio observation of GRB 081221
  93. GRB 081226B: Swift XRT and UVOT upper limits
  94. GRB 081224: Suzaku WAM observation of the prompt emission
  95. GRB 081226: Swift-XRT refined analysis
  96. GRB 081226A: Swift UVOT Upper Limits
  97. GRB 081226A: Swift-BAT refined analysis
  98. GRB 081226: GROND afterglow candidate
  99. GRB 081226: ROTSE-III Optical Limits
  100. GRB 081226: Swift detection of a possible short-hard burst

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