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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"

3401 results found.

  1. GRB 111029A: Enhanced Swift-XRT position
  2. GRB 111024A: MAXI/GSC detection of a burst
  3. GRB 111022B: MITSuME Akeno Optical upper limits
  4. GRB 111022A: Swift-BAT refined analysis
  5. GRB 110905A / MAXI J1836-194: optical monitoring
  6. Trigger 504307: Swift detection of MAXI J1836-194
  7. MAXI/GSC detection of a short soft X-ray transient
  8. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  9. IPN triangulation of GRB 110918A (long duration, extremely intense)
  10. GRB 110915A, Swift-BAT refined analysis
  11. GRB 110903A: Suzaku WAM observation of the prompt emission
  12. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  13. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  14. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  15. Konus-Wind observation of GRB 110903A
  16. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  17. GRB 110801A: optical observations at Mt. Terskol observatory
  18. GRB 110808A: Swift/UVOT Detection
  19. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  20. GRB 110807A: Swift detection of a burst or a posible new SGR
  21. Fermi GBM trigger 334123030 (110804165) is not a GRB
  22. GRB 110801A: optical observations in CrAO
  23. GRB 110801A: SAO RAS optical observations
  24. GRB 110801A: Swift-BAT refined analysis
  25. Swift/UVOT observations of GRB110801A
  26. GRB 110801A: Enhanced Swift-XRT position
  27. GRB 110801A: Swift detection of a burst with an optical counterpart
  28. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  29. INTEGRAL Weak trigger #6331: GRT Optical Observation
  30. AXP 4U 0142+61: Swift-BAT refined analysis
  31. GRB 110726A: Swift-BAT refined analysis
  32. IPN triangulation of GRB 110721A
  33. GRB 110715A: Swift-BAT refined analysis
  34. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  35. GRB 110708A: Konkoly observations
  36. GRB 110709B: Preliminary Swift-BAT refined analysis
  37. GRB 110708A: Lick observations
  38. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  39. SGR 1E 1841-045: Swift-BAT refined analysis
  40. SGR 1E 1841-045: Swift-BAT refined analysis
  41. GRB 110530A: Swift-BAT refined analysis
  42. Swift J1644+57/GRB 110328A, Additional HST Observations
  43. GRB 110520A: WHT IR observations
  44. GRB 110520A - NOT optical observation
  45. GRB 110520A: MASTER-NET optical observations
  46. GRB 110426A: Fermi GBM detection
  47. GRB 110503A: Swift-BAT refined analysis
  48. GRB 110426A: Swift/XRT non-detection
  49. GRB 110422A: Update of Herschel FIR observation schedule
  50. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  51. GRB 110426A: MAXI/GSC detection of a GRB
  52. GRB 110422A: THO optical observations
  53. GRB 110422A: Swift-BAT refined analysis
  54. GRB 110420B: Swift-BAT refined analysis
  55. GRB 110420A: Swift-XRT refined Analysis
  56. GRB110414A: MITSuME Ishigakijima Optical upper limits
  57. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  58. GRB 110411A: MASTER prompt and follow-up optical limits
  59. GRB 110411A, Swift-BAT refined analysis
  60. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  61. GRB 110328A / Swift J164449.3+573451: optical observations
  62. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  63. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  64. GRB 110407A: Swift-BAT refined analysis
  65. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  66. GRB 110402A: Swift detection of a burst
  67. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  68. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  69. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  70. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  71. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  72. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  73. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  74. GRB 110328A: Swift detection of a burst
  75. GRB 110319B Swift-XRT afterglow confirmation
  76. GRB 110319A: Swift-BAT refined analysis
  77. GRB 110318A: Swift-BAT refined analysis
  78. GRB 110315A: Swift-BAT refined analysis
  79. GRB 110315A: Swift detection of a burst
  80. GRB 110312A: GROND Upper Limits
  81. GRB110305A: MITSuME Ishigakijima Optical upper limits
  82. GRB 110213B: Swift/UVOT observations
  83. GRB110213B: X-ray afterglow confirmation
  84. Swift XRT and UVOT Observations of OT 110215
  85. GRB 110213B: P60 Optical Afterglow Candidate
  86. GRB 110213B: Swift XRT observation
  87. Konus-Wind observation of GRB 110213B
  88. GRB 110213B: MAXI/GSC refined analysis
  89. GRB 110213B: MAXI/GSC detection of a probable GRB
  90. GRB 110212A, Swift-BAT refined analysis
  91. SGR-like outburst from the magnetar 1E 1841-04.5
  92. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  93. GRB 110206A: TAROT La Silla observatory optical observations
  94. GRB 101112A: Maidanak and CrAO optical observations
  95. GRB 110128A: Afterglow detection from NOT
  96. IPN triangulation of GRB 110120A
  97. New feature in Fermi GBM GRB Ground Position Notices
  98. GRB 110106B: MASTER optical observations
  99. Short GRB 110106A: MASTER OT observations
  100. Konus-Wind observation of GRB 110102A

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