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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"

36341 results found.

  1. GRB 090123: Swift detection of a burst
  2. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  3. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  4. Swift-BAT trigger 340734 is not a GRB
  5. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  6. GRB 090117C: Suzaku WAM observation of the prompt emission
  7. Trigger 340734: Swift detection of a possible short burst
  8. GRB 090118: Subaru NIR Observation
  9. GRB 090118: KPNO 4m 2nd Epoch Observations
  10. GRB 090118 (BATSS): GRT Optical Observation
  11. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  12. GRB 090118: Swift-XRT observations
  13. GRB090118 Swift/UVOT upper limits
  14. GRB 090118: GROND Upper Limits
  15. GRB 090118: Possible burst detection from Swift-BAT slew data
  16. GRB 090117B : Fermi GBM detection
  17. GRB 090117: confirmation of the X-ray afterglow
  18. GRB 090117C - Fermi GRB Detection
  19. GRB 090117 - Fermi GBM Observations
  20. GRB 090117: GROND Upper Limits
  21. GRB090117 Swift/UVOT upper limits
  22. GRB090117: Swift-XRT detection of a possible candidate afterglow
  23. GRB 090117 - SuperAGILE Localization of a long GRB
  24. GRB 090112B: Suzaku WAM observation of the prompt emission
  25. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  26. GRB 090113: Swift UVOT upper limits
  27. GRB 090113: GROND Upper Limits
  28. GRB 090113: Swift-XRT refined analysis
  29. GRB 090113: Observations from NOT
  30. GRB 090113: Enhanced Swift-XRT position
  31. GRB 090113: Swift-BAT refined analysis
  32. GRB 090113: ROTSE-III Optical Limits
  33. GRB 090112B: Fermi GBM Detection
  34. GRB 090113: Swift detection of a burst
  35. GRB 090112: Fermi GBM detection
  36. GRB 090109: Fermi GBM detection
  37. GRB 090108B: Fermi GBM detection
  38. GRB 090111, Swift-BAT refined analysis
  39. GRB 090111: Swift UVOT Upper Limits
  40. GRB 090108: Fermi GBM Detection
  41. GRB 090111: Swift-XRT refined analysis
  42. GRB 090111: Enhanced Swift-XRT position
  43. GRB 090111: Swift detection of a burst
  44. GRB 090107B: Suzaku WAM observation of the prompt emission
  45. GRB090107B: Fermi GBM Detection
  46. GRB 090102: WSRT Radio Observations
  47. GRB 090107B: Swift XRT afterglow confirmation
  48. GRB 090107B: Swift/UVOT Observations
  49. GRB 090107B: Swift-XRT detection of possible afterglow
  50. GRB 090107B optical observations
  51. GRB 090107B: ROTSE-III Optical Limits
  52. GRB 090107B: a long GRB localized by INTEGRAL
  53. Fermi/GBM detection of GRB 081226A
  54. Fermi/GBM detection of GRB 081225
  55. GRB 090107: Swift-BAT refined analysis
  56. GRB 090107: Swift detection of a burst
  57. GRB 081231: Fermi GBM Detection
  58. GRB 090102: optical decay
  59. VLA radio upper limit on GRB 090102
  60. GRB 090102: GRT Optical Observation
  61. Konus-Wind observation of GRB 090102
  62. GRB 081229: Fermi GBM detection
  63. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  64. GRB 090102: P60 Imaging and P200 Spectroscopy
  65. GRB 090102 Observations from IAC80
  66. GRB 090102: GROND observations of the optical afterglow
  67. Swift UVOT observations of GRB 090102
  68. GRB 090102: Swift-BAT refined analysis
  69. GRB 090102: Swift burst of interest
  70. GRB 090102: Swift XRT refined analysis
  71. GRB 090102: NOT redshift
  72. GRB 090102: Enhanced Swift-XRT position
  73. GRB 090102: TAROT Calern observatory optical light curve
  74. GRB 090102: REM observations of a bright afterglow
  75. GRB 090102: Swift detection of a burst with an optical counterpart
  76. GRB 090102: TAROT Calern observatory optical observations
  77. GRB 081230: GROND confirmation of the afterglow
  78. GRB 081230, Swift-BAT refined analysis
  79. GRB081230: Swift-XRT refined analysis
  80. GRB 081230 Swift/UVOT Observations
  81. GRB 081230: Enhanced Swift-XRT position
  82. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  83. GRB 081230: ROTSE-III Detection of Optical Counterpart
  84. GRB 081230: Swift detection of a burst
  85. GRB 081228: GROND confirmation of the optical/NIR afterglow
  86. GRB 081226B: Fermi GBM observation
  87. GRB 081226C: Fermi GBM detection
  88. GRB 081228, Swift-BAT refined analysis
  89. VLA radio detection of GRB 081221
  90. GRB 081228: Swift/UVOT Upper Limits
  91. GRB 081228: Swift-XRT Team refined analysis
  92. GRB 081228: detection by GROND
  93. GRB 081228: Enhanced Swift-XRT position
  94. GRB 081228: TAROT Calern observatory optical observations
  95. GRB 081228: Swift detection of a burst
  96. VLA radio observation of GRB 081221
  97. GRB 081226B: Swift XRT and UVOT upper limits
  98. GRB 081224: Suzaku WAM observation of the prompt emission
  99. GRB 081226: Swift-XRT refined analysis
  100. GRB 081226A: Swift UVOT Upper Limits

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