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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"

359 results found.

  1. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  2. GRB 120729A: Swift-XRT refined Analysis
  3. Konus-Wind observation of GRB 120716A
  4. IPN Triangulation of unusual GRB 120716A
  5. Konus-Wind observation of GRB 120711A
  6. GRB 120624B, Swift-BAT refined analysis
  7. GRB 120424A: MAXI/GSC detection of a burst
  8. GRB 111215A: Swift-BAT refined analysis
  9. GRB 111123A, Swift-BAT refined analysis
  10. GRB 111123A: Swift detection of a burst
  11. GRB 110709B: Preliminary Swift-BAT refined analysis
  12. GRB 110610A: Swift-BAT refined analysis
  13. GRB 110422A: Herschel observation scheduled
  14. GRB 110102A: Swift detection of a burst with an optical detection
  15. GRB 101030A: Swift-BAT refined analysis
  16. Konus-Wind observation of GRB 101014A
  17. GRB 100915A: Swift-BAT refined analysis
  18. XRF 100616a : MAXI/GSC detection of a probable XRF
  19. GRB 100415A: MAXI/GSC detection of a probable GRB
  20. GRB 091221: Swift detection of a burst
  21. GRB 091010: Swift-XRT refined analysis
  22. GRB 090814A: Swift/UVOT Observations
  23. GRB 090712: Swift-BAT refined analysis
  24. GRB 090516: Swift XRT refined analysis
  25. GRB 090510: Swift-BAT refined analysis
  26. GRB 090423 limiting magnitudes
  27. GRB 090410: Swift-BAT refined analysis
  28. GRB 090407: Swift UVOT Upper Limits
  29. GRB 090301A: Suzaku WAM observation of the prompt emission
  30. GRB 090206: Fermi GBM detection
  31. GRB 090202: Fermi GBM detection
  32. GRB 080928, Swift-BAT final refined analysis
  33. GRB 080928, Swift-BAT initial refined analysis
  34. GRB 080916A: Swift XRT refined analysis
  35. GRB 080825C: Fermi GBM Spectral Analysis
  36. ATCA radio upper limit on GRB 080723B
  37. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  38. GRB 080503, Swift-BAT refined analysis
  39. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  40. SAX J1818.6-1703: Swift detection (trigger 306379)
  41. GRB 080205: Swift XRT refined analysis
  42. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  43. UVOT observations of SAXJ1810.8-2609
  44. Swift detection of a outburst from SAX J1810.8-2609
  45. GRB 070714B: Swift/UVOT Upper Limits
  46. GRB 070531: Swift-BAT refined analysis
  47. GRB 070520B: Swift-XRT refined analysis
  48. GRB 070318, Swift-BAT refined analysis
  49. GRB 070110: Ep,i - Eiso correlation
  50. GRB 061201: Swift detection of a short hard burst
  51. GRB 061019, Swift-BAT refined analysis
  52. GRB060319: MASTER limit
  53. GRB060319: MASTER optical observation
  54. GRB 050904: early Swift XRT analysis results
  55. Swift/UVOT photometry of GRB050730
  56. GRB050724: Radio Observation
  57. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  58. Swift/UVOT observation of XRF 050522
  59. GRB050309: CONCAM pre-trigger and trigger coincident optical
  60. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  61. XMM-Newton Observation of GRB031203
  62. XMM-Newton Observation of GRB031203
  63. IPN triangulation of GRB030421 (annulus)
  64. BeppoSAX GRB : GRB020409
  65. GRB020322: Candidate Optical Afterglow
  66. Bepposax GRB020322 The second springtime BSAX GRB
  67. GRB 011211 Optical Observations: Likely Afterglow
  68. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  69. GRB011121: BeppoSAX-WFC refined positions
  70. BEPPOSAX GRB011121
  71. The X-ray Flash 011030 ('GRB 011030')
  72. IPN triangulation of GRB010629
  73. Support extension to the BeppoSAX mission
  74. GRB010222: possible optical counterpart
  75. GRB010222
  76. GRB 010214, Optical Observations
  77. GRB000528, Radio Observations
  78. IPN triangulation of GRB000516
  79. BeppoSAX GRB000424
  80. GRB000419 [IPN Position]
  81. 1SAXJ1715.0-7134 refined position
  82. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  83. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  84. Budget cuts in BeppoSAX operations: impact on GRB observations
  85. GRB000226 [IPN Position]
  86. GRB 000210: BATSE Observations
  87. GRB000210, Radio Observations
  88. SAX_WFC_GRB_NOTICE
  89. SAX_WFC_GRB_NOTICE
  90. GCN resumes full operations
  91. IPN error box for GRB991216
  92. GRB 991217 (SAX J2303.2+0015) Optical observations
  93. GRB991217/SAX J2303.2+0015, optical observations
  94. SAX J2303.2+0015 Optical observations
  95. GRB 991217 (SAX J2303.2+0015) Optical observations
  96. GRB 991217
  97. SAX J2303.2+0015: an x-ray/GRB?
  98. BeppoSAX NFI Observation of GRB991106
  99. GRB 991105: BATSE Observations
  100. BeppoSAX refined position for GRB991106

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