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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"

28121 results found.

  1. GRB 110928A: Swift-XRT observations
  2. GRB 110928A: Swift/UVOT finding chart observation
  3. GRB 110928A: PAIRITEL NIR Observations
  4. GRB 110928A: ROTSE-III Optical Limits
  5. GRB 110924A: Swift detection of a possible burst
  6. GCN for GRB 110921B
  7. GRB 110921A: Swift/UVOT Observations
  8. GRB 110921A: NOT observations
  9. GRB 110921A: Fermi GBM observation
  10. GRB 110921A: TNT astrometry
  11. GRB 110921A: Swift-XRT refined Analysis
  12. GRB 110921A, Swift-BAT refined analysis
  13. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  14. GRB 110921A: Enhanced Swift-XRT position
  15. GRB 110918A: Swift-XRT refined Analysis
  16. GRB 110921A: Swift detection of a burst
  17. GRB 110915B : X-ray afterglow confirmation
  18. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  19. GRB 110918A optical observation
  20. GRB 110918A: GROND detection of the afterglow candidate
  21. GRB 110918A: INT optical detection of Swift candidate afterglow
  22. GRB 110918A: Swift-XRT observations
  23. GRB110918A: BOOTES-1 optical limit
  24. Swift detection of short bursts from PSR J1647-4552
  25. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  26. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  27. GRB 110915A: Swift/UVOT Upper Limits
  28. GRB 110915B: Swift/UVOT Upper Limits
  29. GRB 110915A: GROND Upper limits
  30. GRB 110915A, Swift-BAT refined analysis
  31. GRB 110915A: Swift-XRT refined Analysis
  32. GRB 110915B: Afterglow candidate from OSN
  33. GRB 110915A: Deep Near-IR Limits from Magellan
  34. GRB 110915B: XRT afterglow candidate
  35. GRB 110903A: Suzaku WAM observation of the prompt emission
  36. GRB 110915A: Deep Gemini-South i/z-band imaging
  37. GRB110915A MITSuME Okayama J-band upper-limit
  38. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  39. GRB 110915A: NOT observations
  40. GRB 110915A: 1.23m CAHA I-band observations
  41. GRB 110915B: SuperAGILE localization of a long GRB
  42. GRB 110915A: Enhanced Swift-XRT position
  43. GRB 110915A: GMG optical upper limit
  44. GRB 110915A: MASTER-Net early limit
  45. GRB 110915A: Swift detection of a burst
  46. GRB 110825A: Further Swift/XRT Observations
  47. GRB 110731A: SAO RAS and Terskol observations
  48. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  49. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  50. GRB 110903A: Swift/UVOT Upper Limits
  51. GRB 110903A: Swift-XRT observations
  52. GRB 110820A: optical upper limit
  53. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  54. Trigger 502024: Swift detection of KS 1741-293
  55. GRB110825A: Fermi GBM observation
  56. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  57. Swift detection of an SGR burst from Swift J1834.9-0846
  58. GRB 110825A: Suzaku WAM observation of the prompt emission
  59. GRB 110825A: GMG optical observation
  60. GRB 110827A, Swift-BAT refined analysis
  61. GRB 110825A: optical afterglow candidate
  62. GRB 110825A: field inspection and possible host galaxy
  63. GRB110825A: Swift target of opportunity observation
  64. IPN triangulation of GRB110825A (very intense, long-duration)
  65. GRB 110820A, the review of the sky area in plate archives
  66. Swift-BAT Trigger 501485 is noise
  67. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  68. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  69. GRB 110820A: Swift/UVOT Upper Limits
  70. GRB 110820A: Swift-XRT refined Analysis
  71. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  72. GRB 110820A: Swift-BAT refined analysis
  73. GRB 110820A: Enhanced Swift-XRT position
  74. GRB 110820A: CrAO optical upper limit
  75. GRB 110820A: Swift detection of a burst
  76. GRB 110818A: Swift/UVOT Upper Limits
  77. GRB 110818A: Enhanced Swift-XRT position
  78. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  79. GRB 110818A: Swift-XRT refined Analysis
  80. GRB 110815A: Swift-XRT and UVOT refined Analysis
  81. GRB 110818A, Swift-BAT refined analysis
  82. GRB 110815A : Suzaku WAM observation of the prompt emission
  83. GRB 110818A: Swift detection of a burst
  84. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  85. GRB 110801A: optical observations at Mt. Terskol observatory
  86. GRB 110812A: SuperAGILE localization of a long GRB.
  87. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  88. GRB 110808A: Swift/UVOT Detection
  89. GRB 110808A: Swift-BAT refined analysis
  90. GRB 110808A: Swift-XRT refined Analysis
  91. SGR J1834.9-0846: A Neutron Star in W41?
  92. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  93. GRB 110808A: Enhanced Swift-XRT position
  94. GRB 110808A: Swift detection of a burst with optical counterpart
  95. Fermi GBM detection of a SGR-like burst
  96. GRB 110807A: SAO RAS observations
  97. GRB 110807A: Swift detection of a burst or a posible new SGR
  98. GRB 110726A: two epochs of SAO RAS optical observations
  99. IPN triangulation of GRB110802A (short/hard burst)
  100. GRB 110801A: optical observations in CrAO

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