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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"

42475 results found.

  1. Swift detection of 4U 1630-47
  2. GRB 120422A, the review of the sky area in plate archives
  3. Konus-Wind observation of GRB 120426A
  4. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  5. GRB 120422A: MITSuME Ishigakijima upper limit
  6. Swift Trigger 520928 is probably not a burst
  7. GRB 120424A: MAXI/GSC detection of a burst
  8. GRB 120422A: 272 GHz observations from SMA
  9. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  10. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  11. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  12. GRB 120422A GROND observations
  13. GRB 120422A: Super-LOTIS early observations
  14. GRB 120422A: EVLA Detection
  15. GRB 120422A: Xinglong TNT optical upper limit
  16. GRB 120422A: NOT optical observations
  17. GRB 120422A: Gemini redshift of candidate host
  18. GRB 120422A: Zadko observatory - Gingin optical observations
  19. GRB 120422A: Swift-XRT refined Analysis
  20. GRB 120422A: A Swift/UVOT Detection
  21. GRB 120422A: Enhanced Swift-XRT position
  22. GRB 120422A: Swift-BAT refined analysis
  23. GRB 120422A: Gemini observations
  24. GRB 120422A: Swift detection of a burst
  25. GRB 120419A: Swift-XRT and UVOT observations
  26. GRB 120419A: A long GRB detected by INTEGRAL
  27. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  28. Swift Trigger 519874 is probably a noise event
  29. Trigger 519868: Swift detection of SGR1806-20
  30. GRB 120404A: optical observations in Mondy observatory
  31. GRB 120404A: optical observations
  32. GRB 120404A, Optical Observations
  33. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  34. GRB 120404A: SMARTS optical/IR observations
  35. GRB 120404A: EVLA Detection
  36. GRB 120404A: MASTER OT observations
  37. GRB120404A: GROND observations show steeply decaying afterglow
  38. GRB120404A: MOA optical observations of the initial rise afterglow
  39. GRB 120404A: VLT/X-shooter redshift confirmation
  40. GRB 120404A: Swift/UVOT Detection
  41. GRB 120404A: MITSuME Ishigakijima Optical Observation
  42. GRB 120404A: MITSuME Okayama Optical Observation
  43. GRB 120403B: Swift-XRT refined Analysis
  44. GRB 120404A: Swift-XRT refined Analysis
  45. GRB 120404A : TNT optical observation
  46. GRB 120404A: Swift-BAT refined analysis
  47. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  48. GRB 120404A: Enhanced Swift-XRT position
  49. GRB 120402B: MASTER early OT limit
  50. GRB 120403B: TAROT La Silla observatory optical observations
  51. GRB 120403B: Fermi GBM Observation
  52. GRB 120404A: Gemini-N Redshift
  53. GRB 120403B: AAT nIR observations
  54. GRB 120404A: MITSuME Akeno Optical upper limits
  55. GRB 120404A: MASTER early OT limit
  56. GRB 120404A: Faulkes Telescope North afterglow confirmation
  57. GRB 120404A: Swift detection of a burst with an optical counterpart
  58. GRB 120403B: Swift-BAT refined analysis
  59. GRB 120403B: Swift/UVOT Upper Limits
  60. GRB 120403B: Enhanced Swift-XRT position
  61. GRB 120403B: Swift detection of a burst
  62. GRB 120326A, the review of the sky area in plate archives
  63. GRB 120402A: optical upper limit
  64. GRB 120320A: optical upper limit in Mondy observatory
  65. GRB 120320A: early optical upper limit
  66. GRB 120403A: MASTER follow up observations
  67. GRB 120402A: MASTER follow up observations
  68. GRB 120403A, Swift-BAT refined analysis
  69. GRB 120402B: Fermi GBM detection
  70. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  71. GRB 120403A: Swift detection of a burst
  72. GRB 120402A: Swift detection of a possible burst or noise
  73. GRB 120326A: Cima Rest and Bassano Brescia
  74. GRB 120327A: SMARTS optical/IR afterglow observations
  75. GRB 120401A: Swift-XRT refined Analysis
  76. GRB 120401A: Swift-BAT refined analysis
  77. GRB 120326A: HCT optical observations
  78. GRB 120401A: Enhanced Swift-XRT position
  79. GRB 120401A: Prompt enhanced Swift-XRT position
  80. GRB 120401A: Swift detection of a burst
  81. GRB 120326A: EVLA Observations
  82. GRB120327A - ATCA radio afterglow detection at 34GHz
  83. GRB 120324A: CrAO optical upper limit
  84. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  85. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  86. GRB 120326A : Suzaku WAM observation of the prompt emission
  87. GRB 120326A: CARMA 3mm detection
  88. GRB 120324A, the review of the sky area in plate archives
  89. Swift trigger 518853 is most likely GX 301-2
  90. GRB 120326A: Bassano Bresciano Observatory optical observations
  91. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  92. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  93. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  94. Swift trigger 518853: MASTER-ICATE possible OT
  95. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  96. Trigger 518853: Swift detection of a probable Galactic transient
  97. GRB 120328B: Fermi-LAT Observations
  98. GRB 120327A: Zadko optical observations
  99. GRB 120328B: Fermi GBM detection
  100. long/intense GRB 120328B: MASTER follow up observations

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