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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"

346 results found.

  1. GRB 110102A: Swift detection of a burst with an optical detection
  2. GRB 101030A: Swift-BAT refined analysis
  3. Konus-Wind observation of GRB 101014A
  4. GRB 100915A: Swift-BAT refined analysis
  5. XRF 100616a : MAXI/GSC detection of a probable XRF
  6. GRB 100415A: MAXI/GSC detection of a probable GRB
  7. GRB 091221: Swift detection of a burst
  8. GRB 091010: Swift-XRT refined analysis
  9. GRB 090814A: Swift/UVOT Observations
  10. GRB 090712: Swift-BAT refined analysis
  11. GRB 090516: Swift XRT refined analysis
  12. GRB 090510: Swift-BAT refined analysis
  13. GRB 090423 limiting magnitudes
  14. GRB 090410: Swift-BAT refined analysis
  15. GRB 090407: Swift UVOT Upper Limits
  16. GRB 090301A: Suzaku WAM observation of the prompt emission
  17. GRB 090206: Fermi GBM detection
  18. GRB 090202: Fermi GBM detection
  19. GRB 080928, Swift-BAT final refined analysis
  20. GRB 080928, Swift-BAT initial refined analysis
  21. GRB 080916A: Swift XRT refined analysis
  22. GRB 080825C: Fermi GBM Spectral Analysis
  23. ATCA radio upper limit on GRB 080723B
  24. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  25. GRB 080503, Swift-BAT refined analysis
  26. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  27. SAX J1818.6-1703: Swift detection (trigger 306379)
  28. GRB 080205: Swift XRT refined analysis
  29. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  30. UVOT observations of SAXJ1810.8-2609
  31. Swift detection of a outburst from SAX J1810.8-2609
  32. GRB 070714B: Swift/UVOT Upper Limits
  33. GRB 070531: Swift-BAT refined analysis
  34. GRB 070520B: Swift-XRT refined analysis
  35. GRB 070318, Swift-BAT refined analysis
  36. GRB 070110: Ep,i - Eiso correlation
  37. GRB 061201: Swift detection of a short hard burst
  38. GRB 061019, Swift-BAT refined analysis
  39. GRB060319: MASTER limit
  40. GRB060319: MASTER optical observation
  41. GRB 050904: early Swift XRT analysis results
  42. Swift/UVOT photometry of GRB050730
  43. GRB050724: Radio Observation
  44. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  45. Swift/UVOT observation of XRF 050522
  46. GRB050309: CONCAM pre-trigger and trigger coincident optical
  47. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  48. XMM-Newton Observation of GRB031203
  49. XMM-Newton Observation of GRB031203
  50. IPN triangulation of GRB030421 (annulus)
  51. BeppoSAX GRB : GRB020409
  52. GRB020322: Candidate Optical Afterglow
  53. Bepposax GRB020322 The second springtime BSAX GRB
  54. GRB 011211 Optical Observations: Likely Afterglow
  55. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  56. GRB011121: BeppoSAX-WFC refined positions
  57. BEPPOSAX GRB011121
  58. The X-ray Flash 011030 ('GRB 011030')
  59. IPN triangulation of GRB010629
  60. Support extension to the BeppoSAX mission
  61. GRB010222: possible optical counterpart
  62. GRB010222
  63. GRB 010214, Optical Observations
  64. GRB000528, Radio Observations
  65. IPN triangulation of GRB000516
  66. BeppoSAX GRB000424
  67. GRB000419 [IPN Position]
  68. 1SAXJ1715.0-7134 refined position
  69. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  70. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  71. Budget cuts in BeppoSAX operations: impact on GRB observations
  72. GRB000226 [IPN Position]
  73. GRB 000210: BATSE Observations
  74. GRB000210, Radio Observations
  75. SAX_WFC_GRB_NOTICE
  76. SAX_WFC_GRB_NOTICE
  77. GCN resumes full operations
  78. IPN error box for GRB991216
  79. GRB 991217 (SAX J2303.2+0015) Optical observations
  80. GRB991217/SAX J2303.2+0015, optical observations
  81. SAX J2303.2+0015 Optical observations
  82. GRB 991217 (SAX J2303.2+0015) Optical observations
  83. GRB 991217
  84. SAX J2303.2+0015: an x-ray/GRB?
  85. BeppoSAX NFI Observation of GRB991106
  86. GRB 991105: BATSE Observations
  87. BeppoSAX refined position for GRB991106
  88. GRB991105: SAX-GRBM/-WFC detection
  89. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  90. GRB ALERT: GRB991105
  91. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  92. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  93. GRB990806 BeppoSAX follow up
  94. GRB 990712
  95. Infrared and Optical Observations of GRB990705
  96. GRB990704: SAX-NFI results summary
  97. GRB 990704 X-ray Observations
  98. GRB990705: Intriguing Positional Coincidences
  99. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  100. optical observation of the X-ray/GRB transient SAX J0835.9+5118

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