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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"

5544 results found.

  1. GRB150915A : IRSF NIR upper limits
  2. GRB 150910A: Mt. Terskol observatory optical observations
  3. GRB 150910A: TSHAO optical observations
  4. GRB 150915A: GROND detection of an optical counterpart candidate
  5. GRB 150915A: MASTER-NET optical observations
  6. GRB 150915A: Swift detection of a burst
  7. GRB 150910A: Continued RATIR Observations
  8. GRB 150911A: Chuguev observatory upper limit
  9. GRB 150911A: Mt. Terskol observatory upper limit
  10. GRB 150911A: Khureltogot upper limit
  11. GRB 150910A: Mt. Terskol observatory optical observation
  12. GRB 150912A: MITSuME Ishigakijima upper limits
  13. GRB 150910A: RATIR Observations
  14. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  15. GRB 150912A: MASTER-IAC optical observations
  16. GRB150910A: P60 Observations
  17. GRB150911A: P60 Observations
  18. GRB 150910A: AAO optical observations
  19. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  20. GRB 150910A: Chuguev observatory optical observations
  21. GRB 150911A: MITSuME Okayama upper limits
  22. GRB 150910A: TSHAO optical observations
  23. GRB 150910A: MITSuME Ishigakijima Optical Observation
  24. GRB 150910A: SAO RAS optical photometry
  25. GRB 150910A: MITSuME Okayama Optical Observation
  26. GRB 150910A: LCOGT FTN afterglow observations
  27. GRB 150910A: KAIT Optical Afterglow Detection
  28. GRB 150910A: Swift detection of a burst with an optical afterglow
  29. IPN Triangulation of GRB 150906B (short/intense)
  30. GRB 150907B: MASTER-SAAO early optical observations
  31. GRB 150907B: GROND Upper Limits
  32. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  33. GRB 150902A: MASTER-SAAO optical observations
  34. GRB 150902A: Fermi-LAT detection
  35. GRB 150831B: MASTER-IAC early optical observations
  36. IPN Triangulation of GRB 150824A
  37. Konus-Wind observation of GRB 150821A
  38. GRB 150819A: Mondy and TSHAO optical upper limits
  39. GRB 150821A: Fermi GBM detection
  40. GRB 150821A: Swift detection of a burst with an optical afterglow
  41. GRB 150818A: MITSuME Ishigakijima upper limits
  42. GRB 150819A: Prompt enhanced Swift-XRT position
  43. GRB 150817A: Swift detection of a burst
  44. GRB 150811A: KAIT Refined Analysis
  45. GRB 150811A: Swift detection of a burst
  46. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  47. GRB 150801A: MAXI/GSC detection
  48. GRB 150727A: Swift detection of a burst with an optical counterpart
  49. GRB 150724A: Enhanced Swift-XRT position
  50. GRB 150724A: Prompt enhanced Swift-XRT position
  51. GRB 150724A: Swift detection of a burst
  52. GRB 150722A: Swift detection of a burst
  53. Swift Trigger 649706: a possible GRB or bright Galactic transient
  54. GRB 150716A: Swift detection of a burst
  55. GRB 150711A: Swift detection of a burst
  56. IPN Triangulation of GRB 150702A
  57. GRB 150626A: Swift detection of a burst
  58. V404 Cyg: MASTER Swift, Integral alert observations
  59. GRB 150616A: Watcher optical upper limit
  60. Swift triggers again on V404 Cyg
  61. Swift Trigger 644520 is V404 Cyg
  62. GRB 150616A: Swift detection of a burst
  63. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  64. Optical follow-up of Swift trigger on V404 Cyg
  65. GRB 150608A: MITSuME Akeno optical upper limits
  66. GRB 150607A: Swift/UVOT Detection
  67. GRB 150607A: Swift detection of a burst with an optical counterpart
  68. GRB 150523A: Suzaku WAM observation of the prompt emission
  69. Konus-Wind observation of GRB 150523A
  70. GRB 150523A: Fermi-LAT detection
  71. GRB 150523A: Fermi GBM detection
  72. GRB 150518A: Correction
  73. GRB 150424A: 9.8 GHz VLA detection
  74. GRB 150430A: GROND Upper Limits
  75. GRB 150413A: CrAO optical observations
  76. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  77. GRB 150428B: Swift detection of a burst
  78. GRB 150424A: GROND detects strong fading
  79. GRB 150424A: NOT optical observations
  80. GRB 150424B: Fermi GBM detection
  81. GRB 150424A: Swift/UVOT Observations
  82. GRB 150424B: MAXI/GSC detection
  83. GRB 150424A: Keck detection of optical afterglow
  84. GRB 150424A: Swift detection of a short burst
  85. Swift trigger 638589 is probably not an astrophysical source
  86. GRB 150418A: MAXI/GSC detection
  87. Swift detection of SAX J1808.4-3658
  88. Swift triggered on a source in Terzan 5 (trigger=637212)
  89. GRB 150323C: CrAO optical observations
  90. GRB 150323C: additional optical observations in Mondy
  91. GRB 150403A: Swift detection of a burst with an optical counterpart
  92. GRB 150317A: likely host galaxy detection
  93. GRB 150323C: MITSuME Akeno Optical observation
  94. GRB 150220A: Optical observations at Kyiv comet station
  95. Konus-Wind observation of GRB 150323B
  96. GRB 150323C: Mondy optical observations
  97. GRB 150323C, Swift-BAT refined analysis
  98. GRB 150323B: Fermi GBM observation
  99. GRB 150323C: MASTER-net optical observation
  100. GRB 150323B detected in ground analysis of Swift-BAT data

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