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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"

28247 results found.

  1. GRB 111008A: Swift-XRT refined Analysis
  2. GRB 111008A, GROND observations
  3. GRB 111008A: NOT optical observation
  4. GRB 111008A: Gemini optical counterpart
  5. GRB 111008A: Enhanced Swift-XRT position
  6. GRB 111008A, Swift-BAT refined analysis,
  7. GRB 111008A: Swift detection of a burst
  8. GRB 111005A: ATCA 18 GHz detection
  9. GRB 111005A: ATCA radio upper limit
  10. GRB 111005A : miniTAO/ANIR NIR observations
  11. GRB 111005A: GROND NIR observations
  12. GRB 111005A: VLT IR observations
  13. GRB 111005A: Swift-BAT refined analysis
  14. GRB 111005A: Swift detection of a burst
  15. GRB 111003A: Fermi GBM detection
  16. GRB 110921A: MITSuME-Akeno Optical photometry
  17. Skynet/Dolomiti observations of GRB 110928A
  18. Skynet observations of GRB 110928A
  19. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  20. GRB 110928A: Swift/UVOT Upper Limits
  21. GRB 110928A: Swift-XRT refined Analysis
  22. GRB 110825A: GROND Observations
  23. GRB 110928A: Enhanced Swift-XRT position
  24. GRB 110928A: P60 Observations
  25. GRB 110928A: Further PAIRITEL NIR Observations
  26. GRB 110928A: Swift-BAT refined analysis
  27. GRB 110928A: Swift-XRT observations
  28. GRB 110928A: Swift/UVOT finding chart observation
  29. GRB 110928A: PAIRITEL NIR Observations
  30. GRB 110928A: ROTSE-III Optical Limits
  31. GRB 110924A: Swift detection of a possible burst
  32. GCN for GRB 110921B
  33. GRB 110921A: Swift/UVOT Observations
  34. GRB 110921A: NOT observations
  35. GRB 110921A: Fermi GBM observation
  36. GRB 110921A: TNT astrometry
  37. GRB 110921A: Swift-XRT refined Analysis
  38. GRB 110921A, Swift-BAT refined analysis
  39. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  40. GRB 110921A: Enhanced Swift-XRT position
  41. GRB 110918A: Swift-XRT refined Analysis
  42. GRB 110921A: Swift detection of a burst
  43. GRB 110915B : X-ray afterglow confirmation
  44. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  45. GRB 110918A optical observation
  46. GRB 110918A: GROND detection of the afterglow candidate
  47. GRB 110918A: INT optical detection of Swift candidate afterglow
  48. GRB 110918A: Swift-XRT observations
  49. GRB110918A: BOOTES-1 optical limit
  50. Swift detection of short bursts from PSR J1647-4552
  51. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  52. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  53. GRB 110915A: Swift/UVOT Upper Limits
  54. GRB 110915B: Swift/UVOT Upper Limits
  55. GRB 110915A: GROND Upper limits
  56. GRB 110915A, Swift-BAT refined analysis
  57. GRB 110915A: Swift-XRT refined Analysis
  58. GRB 110915B: Afterglow candidate from OSN
  59. GRB 110915A: Deep Near-IR Limits from Magellan
  60. GRB 110915B: XRT afterglow candidate
  61. GRB 110903A: Suzaku WAM observation of the prompt emission
  62. GRB 110915A: Deep Gemini-South i/z-band imaging
  63. GRB110915A MITSuME Okayama J-band upper-limit
  64. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  65. GRB 110915A: NOT observations
  66. GRB 110915A: 1.23m CAHA I-band observations
  67. GRB 110915B: SuperAGILE localization of a long GRB
  68. GRB 110915A: Enhanced Swift-XRT position
  69. GRB 110915A: GMG optical upper limit
  70. GRB 110915A: MASTER-Net early limit
  71. GRB 110915A: Swift detection of a burst
  72. GRB 110825A: Further Swift/XRT Observations
  73. GRB 110731A: SAO RAS and Terskol observations
  74. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  75. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  76. GRB 110903A: Swift/UVOT Upper Limits
  77. GRB 110903A: Swift-XRT observations
  78. GRB 110820A: optical upper limit
  79. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  80. Trigger 502024: Swift detection of KS 1741-293
  81. GRB110825A: Fermi GBM observation
  82. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  83. Swift detection of an SGR burst from Swift J1834.9-0846
  84. GRB 110825A: Suzaku WAM observation of the prompt emission
  85. GRB 110825A: GMG optical observation
  86. GRB 110827A, Swift-BAT refined analysis
  87. GRB 110825A: optical afterglow candidate
  88. GRB 110825A: field inspection and possible host galaxy
  89. GRB110825A: Swift target of opportunity observation
  90. IPN triangulation of GRB110825A (very intense, long-duration)
  91. GRB 110820A, the review of the sky area in plate archives
  92. Swift-BAT Trigger 501485 is noise
  93. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  94. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  95. GRB 110820A: Swift/UVOT Upper Limits
  96. GRB 110820A: Swift-XRT refined Analysis
  97. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  98. GRB 110820A: Swift-BAT refined analysis
  99. GRB 110820A: Enhanced Swift-XRT position
  100. GRB 110820A: CrAO optical upper limit

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