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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"

3559 results found.

  1. GRB 110411A: MASTER prompt and follow-up optical limits
  2. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  3. GRB 110407A: MASTER optical observations
  4. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  5. GRB 110407A : Xinglong TNT upper limit
  6. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  7. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  8. GRB 110402A: PAIRITEL NIR Upper Limits
  9. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  10. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  11. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  12. GRB 110328A / Swift J164449.3+573451: optical observations
  13. GRB 110328B: Fermi-LAT Detection
  14. GRB 110328B: Fermi GBM detection
  15. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  16. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  17. GRB / X-ray transient 110328A: Gemini optical observations
  18. GRB 110318B: Swift detection of a burst
  19. GRB110312A: MITSuME Okayama Optical upper limits
  20. GRB 110312A: Swift detection of a burst
  21. GRB 101225A, the review of the sky area in plate archives
  22. GRB 110210A: optical upper limit
  23. GRB 110213A: YNAO-GMG Observations
  24. GRB 110213B: Swift XRT observation
  25. Konus-Wind observation of GRB 110213A
  26. GRB 110213A: THO optical observations
  27. GRB 110128A: Fermi GBM detection
  28. GRB110128A: MITSuME Okayama optical upper limits
  29. GRB 101112A: Maidanak and CrAO optical observations
  30. GRB 110128A: Swift/UVOT observations
  31. GRB 110128A: WHT redshifts of nearby field galaxies
  32. GRB 110128A: Afterglow detection from NOT
  33. GRB 110112A: Swift-BAT refined analysis
  34. Short GRB 110106A: MASTER OT observations
  35. GRB 101225A: P60 Observations
  36. GRB 101224A: Swift detection of a short burst
  37. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  38. GRB 101219B: Fermi GBM observation
  39. GRB 101123A: MASTER prompt optical observations
  40. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  41. Konus-Wind observation of GRB 101112A
  42. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  43. GRB101112A: Liverpool Telescope Afterglow Candidate
  44. GRB 101020A, Swift-BAT refined analysis
  45. GRB101017A: MITSuME Okayama optical upper limits
  46. GRB 100925A/MAXI J1659-152 - NOT optical observations
  47. GRB 100906A: RTT150 optical observations
  48. GRB10901A: Optical observations at IAO
  49. GRB 100901A: SARA-N observations
  50. GRB 100728B: optical photometry of ISON-NM
  51. GRB 100728A: Suzaku WAM observation of the prompt emission
  52. GRB 100728B: Fermi GBM observation
  53. GRB 100728B: optical detection
  54. GRB 100728A: Fermi GBM observation
  55. GRB 100725B: Swift-BAT refined analysis
  56. GRB 100713A: optical observation in Maidanak
  57. GRB 100713A: Swift XRT refined analysis
  58. GRB 100713A: TNG optical observations
  59. GRB 100615A: Chandra X-ray ToO Observation
  60. XRF 100701A : MAXI/GSC detection of a probable XRF
  61. GRB 100628A: Gemini North Observations
  62. GRB 100625A Gemini-South 2nd epoch imaging
  63. GRB100628A : MOA optical upper limit
  64. GRB100628A: RTT150 optical observations
  65. GRB 100625A: Swift detection of a short hard burst
  66. XRF 100616a : MAXI/GSC detection of a probable XRF
  67. GRB 100615A: Enhanced Swift-XRT position
  68. GRB 100615A: Swift detection of a burst
  69. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  70. GRB 100513A: CrAO optical observations
  71. GRB100526B: GROND Upper limits
  72. GRB 100528A: Fermi GBM observation
  73. GRB 100528A: SuperAGILE Localization of a Long GRB
  74. GRB 100526A: Swift detection of a burst
  75. GRB100504A: Optical upper limits at IAO
  76. GRB 100510A: MAXI/GSC detection
  77. GRB 100418A: RTT150 optical observations
  78. Trigger 421072: Possible Swift detection of a GRB or transient
  79. GRB 100418A: RTT150 optical observations
  80. GRB 100414A : WSRT Radio Detection
  81. GRB 100424A: Gemini/NIRI Candidate Afterglow
  82. GRB 100423A: Swift detection of a burst
  83. GRB 100418A: further GROND observations and light curve fit
  84. GRB 100413A: Suzaku WAM observation of the prompt emission
  85. GRB 100413B: Swift Confirmation of Burst
  86. GRB 100413A: Swift detection of a burst
  87. Trigger 419015 is probably not a GRB
  88. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  89. GRB 100316B: Swift/UVOT observations
  90. GRB 100316B: Enhanced Swift-XRT position
  91. GRB 100316B: Swift detection of a burst with optical counterpart
  92. GRB 100305A: P60 Observations
  93. GRB 100302A: Skynet/DAO Observations
  94. GRB 100213A: GRT Optical Observation
  95. GRB 100205A: Keck limits on an underlying host galaxy
  96. GRB 100205A: BOAO/LOAO zYJK observation
  97. GRB 100111A: Swift UVOT Refined Analysis
  98. GRB 100111A: Swift detection of a burst with an optical afterglow
  99. GRB 091221: Skynet/PROMPT Detections
  100. GRB091208B: NOT optical observations

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