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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"

5848 results found.

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

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