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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

20521 results found.

  1. GRB 120404A : TNT optical observation
  2. GRB 120404A: Swift-BAT refined analysis
  3. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  4. GRB 120404A: Enhanced Swift-XRT position
  5. GRB 120402B: MASTER early OT limit
  6. GRB 120403B: TAROT La Silla observatory optical observations
  7. GRB 120403B: Fermi GBM Observation
  8. GRB 120404A: Gemini-N Redshift
  9. GRB 120403B: AAT nIR observations
  10. GRB 120404A: Faulkes Telescope North afterglow confirmation
  11. GRB 120404A: Swift detection of a burst with an optical counterpart
  12. GRB 120403B: Swift/UVOT Upper Limits
  13. GRB 120403B: Enhanced Swift-XRT position
  14. GRB 120403B: Swift detection of a burst
  15. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  16. GRB 120402A: optical upper limit
  17. GRB 120320A: optical upper limit in Mondy observatory
  18. GRB 120320A: early optical upper limit
  19. GRB 120328B: Pi of the Sky simultaneous upper limits
  20. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  21. GRB 120402A: Swift detection of a possible burst or noise
  22. GRB 120326A: Cima Rest and Bassano Brescia
  23. GRB 120327A: SMARTS optical/IR afterglow observations
  24. GRB 120401A: Enhanced Swift-XRT position
  25. GRB 120401A: Swift detection of a burst
  26. GRB 120324A: CrAO optical upper limit
  27. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  28. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  29. GRB 120324A, the review of the sky area in plate archives
  30. GRB 120326A: Bassano Bresciano Observatory optical observations
  31. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  32. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  33. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  34. Swift trigger 518853: MASTER-ICATE possible OT
  35. Trigger 518853: Swift detection of a probable Galactic transient
  36. GRB 120328B: Fermi-LAT Observations
  37. GRB 120327A: Zadko optical observations
  38. GRB 120328A: Swift/UVOT Upper Limits
  39. Konus-Wind observation of GRB 120328B
  40. IPN Triangulation of GRB 120328B (long/intense)
  41. GRB 120327A: MITSuME Ishigakijima Optical Observation
  42. GRB 120326A: MITSuME Ishigakijima Optical Observation
  43. GRB 120328A: Enhanced Swift-XRT position
  44. GRB 120328A: TAROT La Silla observatory optical observations
  45. Skynet/PROMPT observations of GRB120328A
  46. GRB 120328A: Swift detection of a burst
  47. GRB 120327A afterglow detection
  48. GRB 120326A: PAIRITEL NIR Observations
  49. GRB 120326A: Bassano Bresciano Observatory optical observations
  50. GRB 120327A: Swift/UVOT further analysis
  51. GRB 120326A : SMA submm observation
  52. GRB 120327A: Enhanced Swift-XRT position
  53. GROND observations of GRB 120327A
  54. GRB 120327A: REM NIR and optical observations
  55. Skynet/PROMPT observations of GRB120327A
  56. GRB 120326A: Maisoncelles Observatory optical observations
  57. GRB 120327A: TAROT La Silla observatory optical detection
  58. GRB 120327A: Swift detection of a burst with an optical counterpart
  59. GRB 120326A : LOT optical observation
  60. GRB 120326A: Swift-BAT refined analysis
  61. GRB 120326A: Swift/UVOT Detection
  62. GRB 120326A: Enhanced Swift-XRT position
  63. Skynet/Dolomiti Observations of GRB120326A
  64. GRB 120326A: TAROT Calern observatory afterglow optical detection
  65. GRB 120326A: Swift detection of a burst
  66. GRB 120323A: Fermi LAT observations
  67. IPN Triangulation of GRB 120323A (short/very intense)
  68. GRB 120324A: GROND observations
  69. GRB 120324A: CQUEAN rizY Observation
  70. GRB 120324A: Swift/UVOT Upper Limits
  71. GRB 120324A: TAROT La Silla observatory optical observations
  72. GRB 120324A: Enhanced Swift-XRT position
  73. GRB 120324A: Swift detection of a burst
  74. GRB 120320A: Zadko optical observations
  75. GRB 120229A: Magellan observations and limit on an optical afterglow
  76. GRB 120320A: Swift/UVOT Upper Limits
  77. GRB 120320A: MITSuME Okayama Optical upper limits
  78. GRB 120320A , optical observations
  79. GRB 120320A: BOOTES-4 optical upper limit
  80. GRB 120320A: Gemini-N and UKIRT observations
  81. GRB 120320A: Enhanced Swift-XRT position
  82. IPN Triangulation of GRB 120316A
  83. GRB 120320A: Swift detection of a burst
  84. GRB 120302A: Swift XRT refined analysis
  85. GRB 120312A: CrAO optical upper limit
  86. GRB 120312A: Gemini and UKIRT imaging
  87. GRB 120311A: Optical follow-up
  88. GRB 120311B: Optical follow-up
  89. GRB 120311A: C88 optical limits
  90. GRB 120312A: Swift/UVOT Upper Limits
  91. GRB 120312A: WHT candidate afterglow
  92. GRB 120312A: NOT observations
  93. GRB 120312A: Swift-XRT refined Analysis
  94. GRB 120311B: C88 optical limits
  95. GROND observations of GRB 120311A
  96. GRB 120311B: Swift/UVOT Upper Limits
  97. GRB 120311B: MITSuME Okayama Optical upper limits
  98. GRB 120311B: Faulkes Telescope North observations
  99. GRB 120311B: Enhanced Swift-XRT position
  100. GRB 120311B: Swift-XRT observations

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