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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"

26682 results found.

  1. GRB 120514A: GROND upper limits
  2. GRB 120514A: Swift/UVOT Upper Limits
  3. GRB 120514A: UKIRT IR observations
  4. GRB 120514A: Swift-XRT refined Analysis
  5. GRB 120514A: APEX observations of the submm counterpart
  6. GRB 120514A: Enhanced Swift-XRT position
  7. GRB 120514A: Swift-BAT refined analysis
  8. GRB 120514A: TAROT Calern observatory optical observations
  9. GRB 120514A: Swift detection of a burst
  10. GRB 120422A: Konkoly optical observations
  11. Fermi GBM Trigger 358364818 is not a GRB
  12. Fermi Trigger 358364818: BOOTES-4 observations
  13. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  14. GRB 120510A: Swift XRT and UVOT observations
  15. GRB 120510A: MAXI/GSC detection of a burst
  16. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  17. GRB 120422A: P200 NIR detection
  18. GRB 120422A: optical observations
  19. Swift detection of 4U 1630-47
  20. IPN Triangulation of bright GRB 120426A
  21. GRB 120422A: MITSuME Ishigakijima upper limit
  22. Swift Trigger 520928 is probably not a burst
  23. GRB 120422A: 272 GHz observations from SMA
  24. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  25. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  26. GRB 120422A GROND observations
  27. GRB 120422A: Super-LOTIS early observations
  28. GRB 120422A: NOT optical observations
  29. GRB 120422A: Zadko observatory - Gingin optical observations
  30. GRB 120422A: Swift-XRT refined Analysis
  31. GRB 120422A: A Swift/UVOT Detection
  32. GRB 120422A: Enhanced Swift-XRT position
  33. GRB 120422A: Gemini observations
  34. GRB 120422A: Faulkes Telescope North observations
  35. GRB 120422A: Swift detection of a burst
  36. GRB 120419A: Swift-XRT and UVOT observations
  37. Swift Trigger 519874 is probably a noise event
  38. Trigger 519868: Swift detection of SGR1806-20
  39. GRB 120404A: optical observations in Mondy observatory
  40. GRB 120404A: optical observations
  41. GRB 120404A, Optical Observations
  42. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  43. GRB120404A: GROND observations show steeply decaying afterglow
  44. GRB120404A: MOA optical observations of the initial rise afterglow
  45. GRB 120404A: Swift/UVOT Detection
  46. GRB 120404A: MITSuME Ishigakijima Optical Observation
  47. GRB 120404A: MITSuME Okayama Optical Observation
  48. GRB 120403B: Swift-XRT refined Analysis
  49. GRB 120404A: Swift-XRT refined Analysis
  50. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  51. GRB 120404A: Enhanced Swift-XRT position
  52. GRB 120402B: MASTER early OT limit
  53. GRB 120403B: TAROT La Silla observatory optical observations
  54. GRB 120403B: Fermi GBM Observation
  55. GRB 120404A: Gemini-N Redshift
  56. GRB 120403B: AAT nIR observations
  57. GRB 120404A: Faulkes Telescope North afterglow confirmation
  58. GRB 120404A: Swift detection of a burst with an optical counterpart
  59. GRB 120403B: Swift/UVOT Upper Limits
  60. GRB 120403B: Enhanced Swift-XRT position
  61. GRB 120403B: Swift detection of a burst
  62. GRB 120402A: optical upper limit
  63. GRB 120320A: optical upper limit in Mondy observatory
  64. GRB 120320A: early optical upper limit
  65. GRB 120402B: Fermi GBM detection
  66. GRB 120328B: Pi of the Sky simultaneous upper limits
  67. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  68. GRB 120403A: Swift detection of a burst
  69. GRB 120402A: Swift detection of a possible burst or noise
  70. GRB 120326A: Cima Rest and Bassano Brescia
  71. GRB 120327A: SMARTS optical/IR afterglow observations
  72. GRB 120401A: Swift-XRT refined Analysis
  73. GRB 120401A: Enhanced Swift-XRT position
  74. GRB 120401A: Swift detection of a burst
  75. GRB 120324A: CrAO optical upper limit
  76. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  77. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  78. GRB 120326A : Suzaku WAM observation of the prompt emission
  79. Swift trigger 518853 is most likely GX 301-2
  80. GRB 120326A: Bassano Bresciano Observatory optical observations
  81. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  82. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  83. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  84. Swift trigger 518853: MASTER-ICATE possible OT
  85. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  86. Trigger 518853: Swift detection of a probable Galactic transient
  87. GRB 120328B: Fermi-LAT Observations
  88. GRB 120327A: Zadko optical observations
  89. GRB 120328B: Fermi GBM detection
  90. long/intense GRB 120328B: MASTER follow up observations
  91. GRB 120328A: Swift/UVOT Upper Limits
  92. GRB 120328A: Swift-XRT refined Analysis
  93. IPN Triangulation of GRB 120328B (long/intense)
  94. GRB 120327A: MITSuME Ishigakijima Optical Observation
  95. GRB 120326A: MITSuME Ishigakijima Optical Observation
  96. GRB 120328A: Enhanced Swift-XRT position
  97. GRB 120328A: TAROT La Silla observatory optical observations
  98. Skynet/PROMPT observations of GRB120328A
  99. GRB 120328A: Swift detection of a burst
  100. GRB 120326A: Fermi GBM Observation

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