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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"

3759 results found.

  1. IPN Triangulation of GRB 120707A
  2. GRB 120624B: mm detection at PdBI
  3. Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
  4. IPN Triangulation of GRB 120624A (short/intense)
  5. Konus-Wind observation of GRB 120617A
  6. IPN Triangulation of GRB 120617A (short/intense)
  7. IPN Triangulation of GRB 120602A (long/very bright)
  8. GRB 120521C: Early Tautenburg limits
  9. GRB 120521B: Swift-XRT refined Analysis
  10. GRB 120510A: Swift XRT and UVOT observations
  11. GRB 120427A: MASTER follow up observations
  12. IPN Triangulation of GRB 120427A
  13. GRB 120328B: Pi of the Sky simultaneous upper limits
  14. GRB 120402A: Swift detection of a possible burst or noise
  15. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  16. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  17. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  18. GRB 120328B: Fermi-LAT Observations
  19. GRB 120328B: Fermi GBM detection
  20. long/intense GRB 120328B: MASTER follow up observations
  21. GRB 120326A: Bassano Bresciano Observatory further optical observations
  22. GRB 120316A : Suzaku WAM observation of the prompt emission
  23. GRB 120320A, the review of the sky area in plate archives
  24. IPN Triangulation of GRB 120316A
  25. GRB 120312A: Swift detection of a burst
  26. GRB 120305A: EVLA deep limit on a radio counterpart
  27. GRB 120305A: MASTER-NET early optical observations
  28. Konus-Wind observation of GRB 120226A
  29. GRB 120218A: Swift-BAT refined analysis
  30. GRB 120213A: MASTER-NET early optical observations
  31. GRB 120213A: Swift detection of a burst
  32. GRB 120211A: Swift detection of a burst
  33. GRB 120127A / P48 Imaging
  34. GRB 120119A: Swift/UVOT Observations
  35. GRB 120116A: Swift detection of a burst
  36. GRB 111225A: optical observations in CrAO
  37. GRB 111228A: MASTER-Net optical photometry
  38. GRB 111228A: Optical and NIR observations with Kanata telescope
  39. GRB111228A: Further GMG observations
  40. GRB 111228A: T100 observations
  41. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  42. GRB 111228A: GMG optical observation
  43. GRB 111228A: MASTER OT observations
  44. GRB 111228A: Fermi GBM observation
  45. GRB111228A: MITSuME Okayama Optical Observation
  46. GRB 111215B: Suzaku WAM observation of the prompt emission
  47. Konus-Wind observation of GRB 111215B
  48. IPN Triangulation of GRB 111215B (long/intense)
  49. GRB 111215A: MASTER-Net optical prompt and follow up observations
  50. GRB 111215A: Swift detection of a burst
  51. GRB 111209A: PROMPT optical observations of early afterglow
  52. GRB 111208A found in ground analysis of BAT data
  53. GRB 111204A: Swift detection of a burst
  54. GRB 111123A: Swift detection of a burst
  55. GRB 111107A: GROND observations
  56. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  57. Swift-BAT trigger 506884 is not a GRB
  58. GRB 111018A: Swift detection of a burst
  59. GRB 111016A: Swift-BAT refined analysis
  60. GRB 111016A: Swift detection of a burst
  61. Konus-Wind observation of GRB 111008A
  62. GRB 111008A, Swift-BAT refined analysis,
  63. GRB 110928A: P60 Observations
  64. GRB 110928A: Further PAIRITEL NIR Observations
  65. GRB 110928A: PAIRITEL NIR Observations
  66. MAXI/GSC detection of a short soft X-ray transient
  67. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  68. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  69. GRB 110731A: SAO RAS and Terskol observations
  70. GRB 110820A: optical upper limit
  71. IPN triangulation of GRB110825A (very intense, long-duration)
  72. GRB 110820A: MASTER-NET first hour observations
  73. IPN triangulation of GRB110815A (long, intense)
  74. GRB110731A: Swift/UVOT Observations
  75. GRB 110731A: FTN+FTS afterglow observations
  76. GRB 110731A: Swift detection of a burst with an optical counterpart
  77. IPN triangulation of GRB 110721A
  78. GRB 110715A optical observations
  79. Konus-Wind observation of GRB 110708B
  80. GRB 110709B BAT refined analysis
  81. Konus-Wind observation of GRB 110709B
  82. GRB 110709B: Preliminary Swift-BAT refined analysis
  83. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  84. GRB 110625A: Fermi LAT detection
  85. GRB 110625A: Swift detection of a burst
  86. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  87. GRB 110520A: TAROT Calern observatory optical observations
  88. GRB 110520A: MASTER-NET optical observations
  89. GRB 110520A: Swift detection of a burst
  90. IPN localization of bright GRB 110518A
  91. GRB 110428A: Fermi-GBM observation
  92. GRB 110422A: optical observations in CrAO
  93. GRB 110422A: Update of Herschel FIR observation schedule
  94. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  95. GRB 110422A: optical observations in CrAO, second epoch
  96. GRB 110422A: optical observations in CrAO
  97. GRB 110422A: THO optical observations
  98. GRB 110422A: NOT optical observation
  99. GRB 110422A: Mondy optical observations
  100. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit

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