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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"

32764 results found.

  1. GRB 100724A: Swift-BAT refined analysis
  2. GRB 100724A: X-shooter redshift
  3. GRB 100724A: fading afterglow seen with GROND
  4. GRB 100724A, GROND detection of an afterglow candidate
  5. GRB 100614A: 10.4-m GTC deep-optical limit
  6. GRB 100719A: Swift-BAT refined analysis
  7. GRB 100713A: optical observation in Maidanak
  8. GRB 100713A: further inspection of TNG images
  9. GRB 100713A: Swift XRT refined analysis
  10. GRB 100713A : IRSF/SIRIUS NIR upper limits
  11. GRB100713A: Swift/UVOT observations
  12. GRB 100713A: GROND upper limits
  13. GRB 100713A: optical upper limit
  14. GRB 100713A: TNG optical observations
  15. GRB 100707A: Suzaku WAM observation of the prompt emission
  16. Konus-Wind observation of GRB 100707A
  17. IPN triangulation of GRB 100707A
  18. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  19. GRB 100707A: Fermi LAT detection
  20. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  21. GRB 100628A: Chandra observations
  22. GRB 100628A: Swift XRT/UVOT refined analysis
  23. Tentative redshift of GRB100704A from Swift-XRT data
  24. Konus-Wind observation of GRB 100701B
  25. IPN triangulation of GRB 100701B
  26. Konus-Wind observation of GRB 100704A
  27. GRB 100704A: Swift XRT refined analysis
  28. GRB 100704: Swift/UVOT Upper Limits
  29. GRB 100704A: Fermi GBM observation
  30. GRB 100704A: Swift-BAT refined analysis
  31. GRB100704A: MOA optical upper limit
  32. GRB 100615A: Additional Gemini/NIRI observations
  33. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  34. GRB 100702A, Swift-BAT refined analysis
  35. GRB 100702A: Swift XRT refined analysis
  36. Swift/UVOT observations of GRB100702A - correction
  37. Swift/UVOT observations of GRB100702A
  38. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  39. GRB 100702A: Magellan near-IR observations
  40. GRB 100702A: VLT optical observations
  41. GRB 100702: ROTSE-III Optical Limits
  42. GRB 100615A: Chandra X-ray ToO Observation
  43. GRB 100213B: Detection of Fading Optical Afterglow
  44. GRB 100625A: Fermi GBM detection
  45. GRB 100628A: Second epoch of Magellan near-IR observations
  46. GRB 100628A: GROND optical/NIR observations of the host candidate
  47. GRB 100628A: Gemini North Observations
  48. GRB 100628A: Coincidence of source "G1" with revised XRT error circle
  49. GRB 100628A: Swift XRT refined position
  50. GRB100625A: GROND confirmation of constant source
  51. GRB 100625A Gemini-South 2nd epoch imaging
  52. GRB100628A : MOA optical upper limit
  53. GRB 090709A: Host galaxy detection
  54. GRB 100628A: Magellan near-IR observations
  55. GRB 100628A: Swift/UVOT Upper Limits
  56. GRB100628A: RTT150 optical observations
  57. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  58. GRB 100628A: INTEGRAL SPI-ACS light curve
  59. GRB 100625A: Magellan near-IR Observations
  60. GRB 100628A: Swift-BAT refined analysis
  61. GRB 100614A: CrAO optical limit
  62. GRB 100625A: Swift/UVOT Upper Limits
  63. GRB 100625A: Swift-BAT refined analysis
  64. Konus-Wind observation of GRB 100625A
  65. GRB 100625A : IRSF/SIRIUS NIR upper limit
  66. GRB 100625A: Swift-XRT Team refined analysis
  67. GRB 100625A: Gemini candidate afterglow
  68. GRB100625A : MOA optical upper limit
  69. GRB 100418A: late time optical observations
  70. Konus-Wind observation of GRB 100621A
  71. GRB 100621A: IRSF/SIRIUS NIR Observation
  72. GRB 100621A MOA-II optical limit
  73. GRB 100619A: Correction to the Fermi GBM trigger time
  74. GRB 100621A: Swift/UVOT observations
  75. GRB 100621A: Swift XRT refined analysis
  76. GRB 100621A: VLT/X-shooter redshift
  77. GRB 100621A: Swift-BAT refined analysis
  78. GRB 100621A: GROND observation of bright NIR afterglow
  79. GRB 100621A: ROTSE-III Optical Limits
  80. GRB 100606A: Optical Limits
  81. GRB 100619A: Fermi GBM detection
  82. GRB 100619A: Swift/UVOT Upper Limits
  83. GRB 100619A: Swift-XRT refind analysis
  84. GRB 100619A: Swift-BAT refined analysis
  85. GRB 100614A: Gemini/NIRI Observations
  86. GRB 100615A: Gemini/NIRI Observations
  87. GRB 100615A: Swift/UVOT Upper Limits
  88. GRB 100614A: Swift/UVOT Upper Limits
  89. GRB 100614A: NOT optical upper limits
  90. GRB 100614A: MASTER-Net optical alert observations
  91. GRB 100614A: Swift-BAT refined analysis
  92. GRB 100615A: Fermi GBM detection
  93. GRB 100615A: Swift-BAT refined analysis
  94. GRB 100615A: Swift-XRT refined analysis
  95. GRB 100614A: Swift-XRT refined analysis
  96. GRB 100615A: GROND observations, upper limits
  97. GRB 100615A: PAIRITEL NIR Upper Limits
  98. GRB 100615A: NTT/Ultracam imaging
  99. GRB 100614A: WHT I-band observations
  100. GRB 100614A: BOOTES-2/TELMA optical observations

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