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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"

12399 results found.

  1. GRB 100728A: Swift detection of a burst
  2. GRB100727A: MOA optical upper limit
  3. GRB 100727A: Swift detection of a burst
  4. GRB100725B: MITSuME optical upper limits
  5. GRB 100725A: GROND upper limits
  6. GRB 100725B: Swift/UVOT Upper Limits
  7. GRB 100725A: Swift/UVOT Upper Limits
  8. GRB 100725B: Swift detection of a burst
  9. GRB 100724A: Swift/UVOT observations
  10. GRB 100713A: optical observation in Maidanak
  11. GRB 100713A : IRSF/SIRIUS NIR upper limits
  12. GRB100713A: Swift/UVOT observations
  13. GRB 100713A: GROND upper limits
  14. GRB 100713A: optical upper limit
  15. GRB100713A: Swift X-ray afterglow detection
  16. GRB 100628A: Swift XRT/UVOT refined analysis
  17. GRB 100704: Swift/UVOT Upper Limits
  18. GRB100704A: MOA optical upper limit
  19. GRB 100704A: Swift detection of a burst
  20. Swift/UVOT observations of GRB100702A
  21. GRB 100702A: Swift detection of a short burst
  22. XRF 100701A : MAXI/GSC detection of a probable XRF
  23. GRB100628A : MOA optical upper limit
  24. GRB 100628A: Swift/UVOT Upper Limits
  25. GRB 100628A: INTEGRAL SPI-ACS light curve
  26. GRB 100628A: Swift detection of a short hard burst
  27. GRB 100625A: Swift/UVOT Upper Limits
  28. GRB 100625A : IRSF/SIRIUS NIR upper limit
  29. GRB100625A : MOA optical upper limit
  30. GRB 100625A: Swift detection of a short hard burst
  31. GRB 100621A MOA-II optical limit
  32. GRB 100621A: Swift/UVOT observations
  33. GRB 100621A: Swift detection of a burst
  34. GRB 100619A: Swift/UVOT Upper Limits
  35. GRB 100619A: Swift detection of a burst
  36. XRF 100616a : MAXI/GSC detection of a probable XRF
  37. GRB 100615A: Swift/UVOT Upper Limits
  38. GRB 100614A: Swift/UVOT Upper Limits
  39. GRB 100614A: NOT optical upper limits
  40. GRB 100614A: MASTER-Net optical alert observations
  41. GRB 100615A: GROND observations, upper limits
  42. GRB 100615A: PAIRITEL NIR Upper Limits
  43. GRB 100615A: Swift detection of a burst
  44. GRB 100606A: GROND observations
  45. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  46. GRB 100606A: Swift/UVOT Upper Limits
  47. GRB 100606A: Swift detection of a burst
  48. GRB 100513A: CrAO optical observations
  49. GRB 100514A: CrAO optical observations
  50. GRB 100526A: optical upper limit
  51. Konus-Wind observation of GRB 100528A
  52. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  53. GRB100526B: GROND Upper limits
  54. GRB 100526B: Swift/UVOT Upper Limits
  55. GRB 100526A: Swift/UVOT Upper Limits
  56. GRB 100526A: NOT optical upper limit
  57. GRB 100526A: MASTER-Net optical alert observations
  58. GRB 100526A: Swift detection of a burst
  59. GRB 100522A: GROND observations, upper limits
  60. Swift/UVOT observations of GRB100522A.
  61. GRB 100522A: Swift detection of a burst
  62. GRB 100518A: GROND afterglow observation and photo-z
  63. GRB 100518A: Swift/UVOT Upper Limits
  64. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  65. GRB 100513A: MITSuME Akeno Optical Observation
  66. GRB 100514A: Swift/UVOT Observations
  67. GRB 100514A: Swift detection of a burst
  68. GRB 100513A: Swift/UVOT upper limits
  69. GRB 100513A, RIMOTS optical upper limits
  70. GRB 100513A: SARA-N Upper Limit
  71. Swift-BAT trigger 421695 is likely not astrophysical
  72. GRB100504A: Optical upper limits at IAO
  73. GRB 100511A, RIMOTS optical upper limits
  74. GRB100508A: Further Swift/UVOT Observations
  75. GRB 100508A: GROND Detection of the optical afterglow
  76. GRB 100508A: Swift detection of a burst
  77. GRB 100504A: Swift/UVOT Observations
  78. GRB 100504A: GROND Upper limits
  79. GRB 100504A: SARA-South Upper Limit
  80. GRB 100504A: Swift detection of a burst
  81. INTEGRAL observations of Swift GRB trigger 421072
  82. Trigger 421072: Possible Swift detection of a GRB or transient
  83. GRB 100423A: xinglong TNT optical upper limit
  84. GRB 100420A: Terskol optical upper limit
  85. GRB 100427A: Swift XRT and UVOT Upper Limits
  86. GRB 100423A: CrAO optical observations
  87. GRB 100424A: CrAO optical observations
  88. GRB100425A: Swift/UVOT Upper Limits
  89. GRB 100424A: Swift/UVOT Upper Limits
  90. GRB 100424A: Liverpool Telescope Upper Limits
  91. GRB100424A: MITSuME optical upper limits
  92. GRB100423A: MITSuME optical upper limits
  93. GRB 100424A : Lulin early z'-band upper limit
  94. GRB 100424A: GROND Upper Limits
  95. GRB 100424A: PAIRITEL NIR Upper Limits
  96. GRB 100425A: Swift detection of a burst
  97. GRB 100424A: Swift detection of a burst
  98. GRB 100420A: GRT Optical Observation
  99. Trigger 420256: Swift detection of a possible GRB
  100. GRB100418A: REM possible afterglow detection

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