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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

45489 results found.

  1. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  2. GRB 130305A found in ground analysis of Swift/BAT data
  3. GRB 121128A: optical observations in Mondy observatory
  4. GRB 121128A: optical upper limit in Maidanak observatory
  5. GRB 130216A: Swift/UVOT Upper Limit
  6. GRB 130219A: Suzaku WAM observation of the prompt emission
  7. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  8. Trigger 549841: Swift detection of SGR1806-20
  9. Konus-Wind observation of GRB 130219A
  10. GRB 130216B: Suzaku WAM observation of the prompt emission
  11. GRB 130216A: possible radio counterpart is steady field source
  12. GRB 130216A: Swift/XRT observations
  13. IPN Triangulation of GRB 130219A
  14. GRB 130215A: Suzaku WAM observation of the prompt emission
  15. GRB 130215A: PTF P48 optical detection
  16. GRB 130219A: Fermi GBM detection
  17. GRB 130216B: Swift/XRT observations
  18. GRB 130216A: Further Swift-BAT refined analysis
  19. GRB 130216B: MASTER-Net early observation
  20. GRB 130216A: MASTER-Net early observations
  21. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  22. GRB 130216A: Fermi GBM observation
  23. GRB 130216B: Fermi GBM observation
  24. GRB 130216A: possible early detection at 15 GHz
  25. GRB 130216A: MITSuME Ishigakijima upper limits
  26. GRB 130216B BAT refined analysis
  27. GRB 130216B: P200 NIR Observations
  28. GRB 130216A: P200 NIR Observations
  29. GRB 130216A: Swift-BAT refined analysis
  30. GRB 130216A: TAROT La Silla observatory optical observations
  31. GRB 130215A: Additional P200 NIR observations
  32. GRB 130216B: Burst found in ground analysis of BAT data
  33. GRB 120118B: host observations and redshift determination
  34. GRB 130216A: OSN I-band observations
  35. GRB 130216A: Swift detection of a burst
  36. GRB 130215A: P200 NIR observations
  37. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  38. GRB 130215A: MITSuME Okayama Optical Observation
  39. GRB 130215A: Fermi GBM detection
  40. GRB 130215A: RAPTOR Measurements
  41. GRB 130215A: GMG optical observation
  42. GRB 130215A: Xinglong optical observations
  43. GRB 130215A: Swift-BAT refined analysis
  44. GRB 130215A: TAROT La Silla observatory optical observations
  45. GRB 130215A: RATIR Optical and NIR Observations
  46. GRB 130215A: REM NIR observations
  47. GRB 130215A: CARMA 3mm detection
  48. GRB 130215A: P60 Observations
  49. GRB 130215A: ROTSE-III data analysis
  50. GRB 130215A: Redshift estimate
  51. Skynet Observations of GRB130215
  52. GRB 130215: ROTSE-III Detection of Optical Counterpart
  53. GRB 130215A: Swift detection of a burst
  54. Swift GRB130206A: late XRT observations.
  55. GRB 130131B: CTIO 0.9-m optical upper-limits
  56. GRB 121128A: optical observations
  57. GRB 121123A: optical observations
  58. GRB 130211A: Swift/UVOT Upper Limits
  59. GRB 130211A: Swift-XRT refined Analysis
  60. GRB 130211A: Swift-BAT refined analysis
  61. GRB 130211A: GROND detection of the afterglow
  62. GRB 130211A: Swift detection of a burst
  63. GRB 130131A: MITSuME Akeno Optical upper limits
  64. GRB 130131B: MITSuME Akeno Optical upper limits
  65. GRB 130122A: PTF P48 optical upper limits
  66. GRB 130206A: GROND Observations
  67. GRB 130206A: Fermi LAT Observations
  68. GRB 130206A: Fermi GBM observation
  69. GRB 130206A: XRT and UVOT follow-up observations.
  70. GRB 130131B: optical upper limit in Mondy observatory
  71. GRB 130206A, Swift-BAT refined analysis
  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 130131B: Swift-XRT refined Analysis
  82. GRB 130131A - UKIRT confirmation of afterglow
  83. GRB 130131B: VLT/X-shooter acquisition camera limits
  84. GRB 130131B: GROND Upper limits
  85. GRB 130131A: CARMA 3mm Observations
  86. GRB 130131A: VLA 5.8 Ghz Detection
  87. GRB 130131B: IAC80 I-band observations
  88. GRB 130131B: Swift/UVOT Upper Limits
  89. GRB 130131A: Swift-XRT refined Analysis
  90. GRB 130131B: MITSuME Okayama optical upper limits
  91. GRB 130131A: MITSuME Okayama optical upper limits
  92. GRB 130131B: Enhanced Swift-XRT position
  93. GRB 130131B: Swift-BAT refined analysis
  94. GRB 130131A: Swift-BAT refined analysis
  95. GRB 130131B: TAROT Calern observatory optical observations
  96. GRB 130131B: Zadko observatory - Gingin optical observations
  97. GRB 130131A: Enhanced Swift-XRT position
  98. GRB 130131B: Swift detection of a burst
  99. GRB 130131A - UKIRT afterglow candidate
  100. GRB 130131A: Swift detection of a burst

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