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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"

5849 results found.

  1. GRB 121128A: MITSuME Akeno Optical upper limits
  2. GRB 121125A: optical upper limit
  3. GRB 121128A: optical observation in Mondy observatory
  4. GRB 121128A: Swift detection of a burst with an optical counterpart
  5. GRB 121125A: Swift detection of a burst with optical counterpart
  6. GRB 121123A: Swift detection of a burst with optical counterpart
  7. GRB 121117A: optical upper limit
  8. GRB 121117A: BOOTES-3 early optical upper limit
  9. Trigger 538084: Swift detection of XTE J1739-302
  10. GRB 121108A: Swift detection of a burst
  11. GRB 121102A: Swift detection of a burst
  12. GRB 121031A: Swift detection of a burst
  13. GRB 121028A: MITSuME Okayama Optical upper limits
  14. GRB 121027A: Swift detection of a burst
  15. GRB 121025A: MAXI/GSC detection
  16. GRB 121024A: Swift detection of a burst with an optical counterpart
  17. GRB 120927A: GROND upper limits
  18. GRB 120923A: Correction to GCN 13823
  19. GRB 120923A: JHK Observation
  20. GRB 120923A: MITSuME Okayama Optical upper limits
  21. GRB 120919B: MASTER prompt optical observations
  22. IPN Triangulation of long GRB 120919A
  23. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  24. Swift Trigger 533836 is a new Galactic transient
  25. GRB 120913B: TAROT La Silla observatory optical photometry
  26. GRB 120907A: optical observations of ISON-Kislovodsk
  27. GRB120911A: MITSuME Okayama Optical upper limits
  28. GRB 120911A: ROTSE-III Optical Limits
  29. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  30. GRB 120908A: Swift Observations
  31. GRB 120909A: Fermi GBM observation
  32. Konus-Wind observation of GRB 120909A
  33. GRB 120908A: MAXI/GSC detection
  34. GRB 120909A: GROND detection of the afterglow
  35. GRB 120909A: Swift detection of a burst
  36. GRB 120907A: Swift/UVOT Detection
  37. GRB 120907A: NOT optical observations
  38. GRB 120907A MASTER optical observations
  39. GRB 120907A: Swift detection of a burst with optical counterpart
  40. IPN Triangulation of short GRB 120830A
  41. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  42. GRB 120811C: Swift detection of a burst with an optical counterpart
  43. Trigger 530588: Swift detection of XMM J174457-2850.3
  44. Swift Trigger 530581: GRB 120811A or a galactic transient
  45. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  46. GRB 120807A: Swift detection of a burst
  47. GRB 120805A: Swift detection of a burst
  48. GRB 120803B: MITSuME Akeno Optical upper limits
  49. GRB 120803B: FTN possible afterglow candidate
  50. GRB 120802A: GRT Optical Observation
  51. GRB 120728A: GROND Afterglow discovery
  52. GRB 120729A: Swift detection of a burst with an optical afterglow
  53. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  54. GRB 120728A: GROND observations
  55. GRB 120716A: optical observation in Maidanak observatory
  56. GRB 120716A: optical observation in CrAO
  57. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  58. GRB 120716A: Optical decay from NOT
  59. GRB 120716A: Candidate Optical Afterglow from PTF
  60. GRB 120714B: Swift detection of a burst
  61. IPN Triangulation of GRB 120709A
  62. GRB 120709A: Fermi GBM detection
  63. GRB 120701A: GROND detection of the afterglow
  64. Swift Trigger 524949: Noise fluctuation near a galaxy
  65. GRB 120614A: MAXI/GSC detection of a burst
  66. GRB 120521B: Fermi GBM observation
  67. GRB 120521C - NOT optical limits
  68. IPN Triangulation of GRB 120519A (short/hard)
  69. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  70. GRB 120521B: Swift detection of a burst
  71. GRB 120514A: Swift detection of a burst
  72. GRB 120427A: MASTER follow up observations
  73. GRB 120422A: optical observations
  74. Swift detection of 4U 1630-47
  75. Konus-Wind observation of GRB 120426A
  76. IPN Triangulation of bright GRB 120426A
  77. GRB 120422A: EVLA Detection
  78. GRB 120422A: A Swift/UVOT Detection
  79. GRB 120422A: Gemini observations
  80. GRB 120422A: Swift detection of a burst
  81. GRB 120401A: Swift detection of a burst
  82. Trigger 518853: Swift detection of a probable Galactic transient
  83. IPN Triangulation of GRB 120328B (long/intense)
  84. GRB 120328A: Swift detection of a burst
  85. GRB 120326A: PAIRITEL NIR Observations
  86. GRB 120326A: LOAO R-band Observations
  87. GRB 120327A: Swift detection of a burst with an optical counterpart
  88. GRB 120326A: CQUEAN grizY Observation
  89. GRB 120326A: Swift detection of a burst
  90. GRB 120324A: GROND observations
  91. Fermi GBM triggers 120309.265 and 120309.402 are not GRBs
  92. GRB 120311A: C88 optical limits
  93. GROND observations of GRB 120311A
  94. GRB 120302A: RTT150 optical observations
  95. GRB 120308A: Swift detection of a burst
  96. GRB 120305A: Swift detection of a short burst
  97. GRB 120302A: GROND detection of an afterglow candidate
  98. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
  99. Swift Trigger 516027 is CC Eri
  100. GRB 120219A: Swift detection of a burst

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