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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"

20523 results found.

  1. GRB 130315A, Swift-BAT refined analysis
  2. GRB 130313A: Swift/UVOT Upper Limits
  3. GRB130315A BOOTES-3 optical limit
  4. GRB 130315A: Swift detection of a burst
  5. GRB 130305A: TLS Tautenburg observations
  6. GRB 130313A: RATIR Optical and NIR Observations
  7. GRB 130313A: TNG optical observations
  8. GRB130313A: Optical observations from GTC
  9. GRB 130313A: NOT optical upper limit
  10. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  11. GRB 130313A: Weihai optical upper limit
  12. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  13. GRB 130313A: Zadko observatory - Gingin optical observations
  14. GRB 130313A: MASTER-Net optical observations
  15. GRB 130313A: Swift detection of a short burst
  16. IPN Triangulation of GRB 130307A
  17. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  18. GRB 130310A: optical observations
  19. GRB 130306A: Swift Detection of a Possible Afterglow
  20. GRB 130131B: host detection and redshift
  21. Konus-Wind observation of GRB 130310A
  22. GRB 130310A: Fermi-LAT detection and localization
  23. GRB 130306A: MITSuME Ishigakijima upper limits
  24. GRB 130305A BAT refined circular
  25. Konus-Wind observation of GRB 130306A
  26. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  27. GRB 130305A: Gemini-North upper limit
  28. GRB 130305A: Swift/UVOT Upper Limit
  29. GRB 130305A: RATIR Observations
  30. GRB 100615A: HST host detection and X-shooter redshift
  31. GRB 130305A: Fermi LAT Detection
  32. GRB 121128A: optical observations in Mondy observatory
  33. GRB 121128A: optical upper limit in Maidanak observatory
  34. GRB 130216A: Swift/UVOT Upper Limit
  35. Trigger 549841: Swift detection of SGR1806-20
  36. GRB 130216A: possible radio counterpart is steady field source
  37. IPN Triangulation of GRB 130219A
  38. GRB 130216B: MASTER-Net early observation
  39. GRB 130216A: MASTER-Net early observations
  40. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  41. GRB 130216A: Fermi GBM observation
  42. GRB 130216A: possible early detection at 15 GHz
  43. GRB 130216A: MITSuME Ishigakijima upper limits
  44. GRB 130216B BAT refined analysis
  45. GRB 130216B: P200 NIR Observations
  46. GRB 130216A: P200 NIR Observations
  47. GRB 130216A: Swift-BAT refined analysis
  48. GRB 130216A: TAROT La Silla observatory optical observations
  49. GRB 130215A: Additional P200 NIR observations
  50. GRB 130216B: Burst found in ground analysis of BAT data
  51. GRB 120118B: host observations and redshift determination
  52. GRB 130215A: P200 NIR observations
  53. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  54. GRB 130215A: MITSuME Okayama Optical Observation
  55. GRB 130215A: RAPTOR Measurements
  56. GRB 130215A: GMG optical observation
  57. GRB 130215A: Xinglong optical observations
  58. GRB 130215A: TAROT La Silla observatory optical observations
  59. GRB 130215A: RATIR Optical and NIR Observations
  60. GRB 130215A: REM NIR observations
  61. GRB 130215A: Redshift estimate
  62. Skynet Observations of GRB130215
  63. GRB 121128A: optical observations
  64. GRB 121123A: optical observations
  65. GRB 130211A: Swift/UVOT Upper Limits
  66. GRB 130211A: GROND detection of the afterglow
  67. GRB 130211A: Swift detection of a burst
  68. GRB 130206A: GROND Observations
  69. GRB 130206A: Fermi LAT Observations
  70. GRB 130206A: XRT and UVOT follow-up observations.
  71. GRB 130131B: optical upper limit in Mondy observatory
  72. GRB 130206A: Zadko observatory - Gingin optical observations
  73. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  74. GRB 130206A: Swift-XRT observations
  75. GRB 130131A: optical observation in Mondy observatory
  76. GRB 130206A: Swift detection of a burst
  77. GRB 130131A: Swift/UVOT Upper Limits
  78. GRB 130131B: RATIR Upper Limits
  79. GRB 130131A: RATIR optical and infrared upper limits
  80. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  81. GRB 130131A - UKIRT confirmation of afterglow
  82. GRB 130131B: VLT/X-shooter acquisition camera limits
  83. GRB 130131B: GROND Upper limits
  84. GRB 130131B: Swift/UVOT Upper Limits
  85. GRB 130131B: MITSuME Okayama optical upper limits
  86. GRB 130131A: MITSuME Okayama optical upper limits
  87. GRB 130131B: Enhanced Swift-XRT position
  88. GRB 130131B: TAROT Calern observatory optical observations
  89. GRB 130131B: Zadko observatory - Gingin optical observations
  90. GRB 130131A: Enhanced Swift-XRT position
  91. GRB 130131B: Swift detection of a burst
  92. GRB 130131A - UKIRT afterglow candidate
  93. GRB 130131A: Swift detection of a burst
  94. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  95. Swift Trigger 547142: MAXI/GSC upper limit
  96. GRB 130122A: RTT150 optical observations
  97. GRB 130122A: Swift/UVOT Detection
  98. GRB 130122A: optical observations
  99. GRB 130122A: RATIR Detection
  100. GRB 130122A: Xinglong optical upper limit

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