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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"

43704 results found.

  1. GRB 120419A: Swift-XRT and UVOT observations
  2. GRB 120419A: A long GRB detected by INTEGRAL
  3. Swift Trigger 519874 is a noise event
  4. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  5. Swift Trigger 519874 is probably a noise event
  6. Trigger 519868: Swift detection of SGR1806-20
  7. GRB 120404A: optical observations in Mondy observatory
  8. GRB 120404A: optical observations
  9. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  10. GRB 120404A: SMARTS optical/IR observations
  11. GRB 120404A: EVLA Detection
  12. GRB 120404A: MASTER OT observations
  13. GRB120404A: GROND observations show steeply decaying afterglow
  14. GRB120404A: MOA optical observations of the initial rise afterglow
  15. GRB 120404A: VLT/X-shooter redshift confirmation
  16. GRB 120404A: Swift/UVOT Detection
  17. GRB 120403B: Swift-XRT refined Analysis
  18. GRB 120404A: Swift-XRT refined Analysis
  19. GRB 120404A : TNT optical observation
  20. GRB 120404A: Swift-BAT refined analysis
  21. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  22. GRB 120404A: Enhanced Swift-XRT position
  23. GRB 120404A: Gemini-N Redshift correction
  24. GRB 120402B: MASTER early OT limit
  25. GRB 120403B: TAROT La Silla observatory optical observations
  26. GRB 120403B: Fermi GBM Observation
  27. GRB 120404A: Gemini-N Redshift
  28. GRB 120404A: MITSuME Akeno Optical upper limits
  29. GRB 120404A: MASTER early OT limit
  30. GRB 120404A: Faulkes Telescope North afterglow confirmation
  31. GRB 120404A: Swift detection of a burst with an optical counterpart
  32. GRB 120403B: Swift-BAT refined analysis
  33. GRB 120403B: Swift/UVOT Upper Limits
  34. GRB 120403B: Enhanced Swift-XRT position
  35. GRB 120403A: Swift/BAT spectral lag analysis
  36. GRB 120403B: Swift detection of a burst
  37. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  38. GRB 120326A, the review of the sky area in plate archives
  39. GRB 120402A: optical upper limit
  40. GRB 120320A: optical upper limit in Mondy observatory
  41. GRB 120320A: early optical upper limit
  42. GRB 120403A: MASTER follow up observations
  43. GRB 120402A: MASTER follow up observations
  44. GRB 120403A, Swift-BAT refined analysis
  45. GRB 120402B: Fermi GBM detection
  46. GRB 120328B: Pi of the Sky simultaneous upper limits
  47. GRB 120403A: Swift detection of a burst
  48. GRB 120402A: Swift detection of a possible burst or noise
  49. GRB 120326A: Cima Rest and Bassano Brescia
  50. GRB 120327A: SMARTS optical/IR afterglow observations
  51. GRB 120401A: Swift-XRT refined Analysis
  52. GRB 120401A: Swift-BAT refined analysis
  53. GRB 120326A: HCT optical observations
  54. GRB 120401A: Enhanced Swift-XRT position
  55. GRB 120401A: Prompt enhanced Swift-XRT position
  56. GRB 120401A: Swift detection of a burst
  57. GRB 120326A: EVLA Observations
  58. GRB120327A - ATCA radio afterglow detection at 34GHz
  59. GRB 120324A: CrAO optical upper limit
  60. GRB 120326A : Suzaku WAM observation of the prompt emission
  61. GRB 120326A: CARMA 3mm detection
  62. GRB 120324A, the review of the sky area in plate archives
  63. Swift trigger 518853 is most likely GX 301-2
  64. Swift trigger 518853: MASTER-ICATE possible OT
  65. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  66. Trigger 518853: Swift detection of a probable Galactic transient
  67. GRB 120328B: Fermi-LAT Observations
  68. GRB 120327A: Zadko optical observations
  69. GRB 120328B: Fermi GBM detection
  70. long/intense GRB 120328B: MASTER follow up observations
  71. GRB 120328A: Swift/UVOT Upper Limits
  72. GRB 120326A: Bassano Bresciano Observatory further optical observations
  73. GRB 120328A: Swift-XRT refined Analysis
  74. Konus-Wind observation of GRB 120328B
  75. IPN Triangulation of GRB 120328B (long/intense)
  76. GRB 120328A: Swift-BAT refined analysis
  77. GRB 120328A: Enhanced Swift-XRT position
  78. GRB 120327A: NOT optical observations
  79. GRB 120328A: TAROT La Silla observatory optical observations
  80. GRB 120326A: Xinglong TNT further optical observation��correction for GCN Cir 13149)
  81. GRB 120326A: Xinglong TNT further optical observation
  82. Skynet/PROMPT observations of GRB120328A
  83. GRB 120328A: Swift detection of a burst
  84. GRB 120327A: GTC redshift confirmation
  85. GRB 120326A: Fermi GBM Observation
  86. GRB 120327A afterglow detection
  87. GRB 120326A: PAIRITEL NIR Observations
  88. GRB 120327A: Swift-XRT refined Analysis
  89. GRB 120326A: LOAO R-band Observations
  90. GRB 120327A: Swift/UVOT further analysis
  91. GRB 120327A: Swift-BAT refined analysis
  92. GRB 120326A : SMA submm observation
  93. GRB 120327A: Enhanced Swift-XRT position
  94. GRB 120327A: X-shooter redshift
  95. GRB 120327A: Gemini-South redshift
  96. GRB 120327A: TAROT La Silla observatory optical decay
  97. GRB120326A: TNT optical observation
  98. GRB 120327A: IAC80 I-band observations
  99. GROND observations of GRB 120327A
  100. GRB 120327A: REM NIR and optical observations

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