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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"

19618 results found.

  1. GRB 130327A: Swift-BAT refined analysis
  2. GRB 130327A: Swift-XRT refined Analysis
  3. GRB 130327A: Swift/UVOT Upper Limits
  4. GRB 130327A: ISON-NM optical upper limit
  5. GRB 130325A Tiled Swift observations
  6. GRB 130327A: Enhanced Swift-XRT position
  7. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  8. GRB 130325A: Fermi LAT detection
  9. GRB 130327A: Swift detection of a burst
  10. report: GRB 130315A: Zadko observatory - Gingin optical observations
  11. GRB 130315A: GROND afterglow candidate
  12. GRB 130305A: optical upper limit in Mondy observatory
  13. GRB 130315A: Swift/UVOT Upper Limits
  14. GRB 130313A: optical upper limit in CrAO
  15. GRB 130313A: optical upper limit in Mondy observatory
  16. GRB 130315A: SALT optical observations
  17. GRB 130315A: Swift-XRT refined Analysis
  18. Swift XRT observations of GRB 130310A
  19. GRB 130315A, Swift-BAT refined analysis
  20. GRB 130313A: Swift/UVOT Upper Limits
  21. GRB 130305A: PTF P48 optical upper limits
  22. GRB130315A BOOTES-3 optical limit
  23. GRB 130315A: Swift detection of a burst
  24. GRB 130305A: TLS Tautenburg observations
  25. GRB 130313A: RATIR Optical and NIR Observations
  26. GRB 130313A: Swift-BAT Spectral lag analysis
  27. GRB 130313A: Fading X-ray Afterglow
  28. Swift-BAT trigger 551030 is not astrophysical
  29. GRB 130313A: Swift-XRT refined Analysis
  30. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  31. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  32. GRB 130313A: Swift-BAT refined analysis
  33. GRB 130313A: Zadko observatory - Gingin optical observations
  34. GRB 130313A: MASTER-Net optical observations
  35. GRB 130313A: Swift detection of a short burst
  36. IPN Triangulation of GRB 130307A
  37. Swift XRT RETRACTION of GRB 130310A afterglow detection
  38. Swift XRT observations of GRB 130310A
  39. GRB 130306A: Swift Detection of a Possible Afterglow
  40. GRB 130306A: Swift-BAT refined analysis
  41. IPN triangulation of GRB 130228A
  42. GRB 130305A BAT refined circular
  43. GRB 130305A: Further Swift-XRT Observations
  44. Konus-Wind observation of GRB 130306A
  45. GRB 130305A: Optical Observations
  46. GRB 130306A: Fermi GBM observation
  47. GRB 130306A: MASTER-Net pre-Swift alert observation
  48. GRB 130305A: Swift/UVOT Upper Limit
  49. GRB 130305A: RATIR Observations
  50. GRB 130306A: Swift detection of a burst
  51. GRB 130305A: P60 Observations
  52. GRB 100615A: HST host detection and X-shooter redshift
  53. GRB 130305A: Swift/XRT detection of the afterglow
  54. Konus-Wind observation of GRB 130305A
  55. GRB 130305A: Fermi GBM observation
  56. GRB 130305A: Fermi LAT Detection
  57. GRB 130305A found in ground analysis of Swift/BAT data
  58. GRB 121128A: optical upper limit in Maidanak observatory
  59. GRB 130216A: Swift/UVOT Upper Limit
  60. GRB 130219A: Suzaku WAM observation of the prompt emission
  61. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  62. Trigger 549841: Swift detection of SGR1806-20
  63. GRB 130216B: Suzaku WAM observation of the prompt emission
  64. GRB 130216A: possible radio counterpart is steady field source
  65. GRB 130216A: Swift/XRT observations
  66. IPN Triangulation of GRB 130219A
  67. GRB 130215A: Suzaku WAM observation of the prompt emission
  68. GRB 130215A: PTF P48 optical detection
  69. GRB 130216B: Swift/XRT observations
  70. GRB 130216A: Further Swift-BAT refined analysis
  71. GRB 130216B: MASTER-Net early observation
  72. GRB 130216A: MASTER-Net early observations
  73. GRB 130216A: Fermi GBM observation
  74. GRB 130216B: Fermi GBM observation
  75. GRB 130216B BAT refined analysis
  76. GRB 130216A: Swift-BAT refined analysis
  77. GRB 130216A: TAROT La Silla observatory optical observations
  78. GRB 130216B: Burst found in ground analysis of BAT data
  79. GRB 130216A: OSN I-band observations
  80. GRB 130216A: Swift detection of a burst
  81. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  82. GRB 130215A: Fermi GBM detection
  83. GRB 130215A: RAPTOR Measurements
  84. GRB 130215A: Swift-BAT refined analysis
  85. GRB 130215A: TAROT La Silla observatory optical observations
  86. GRB 130215A: P60 Observations
  87. GRB 130215A: ROTSE-III data analysis
  88. Skynet Observations of GRB130215
  89. GRB 130215: ROTSE-III Detection of Optical Counterpart
  90. GRB 130215A: Swift detection of a burst
  91. Swift GRB130206A: late XRT observations.
  92. GRB 130131B: CTIO 0.9-m optical upper-limits
  93. GRB 121128A: optical observations
  94. GRB 121123A: optical observations
  95. GRB 130211A: Swift/UVOT Upper Limits
  96. GRB 130211A: Swift-XRT refined Analysis
  97. GRB 130211A: Swift-BAT refined analysis
  98. GRB 130211A: GROND detection of the afterglow
  99. GRB 130211A: Swift detection of a burst
  100. GRB 130122A: PTF P48 optical upper limits

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