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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"

45672 results found.

  1. GRB 111005A: bright galaxy in error circle
  2. GRB 111005A: Swift detection of a burst
  3. GRB 111003A: Fermi GBM detection
  4. GRB 110905A / MAXI J1836-194: optical monitoring
  5. GRB 110921A: MITSuME-Akeno Optical photometry
  6. Skynet/Dolomiti observations of GRB 110928A
  7. Skynet observations of GRB 110928A
  8. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  9. GRB 110928A: Swift/UVOT Upper Limits
  10. Trigger 504307: Swift detection of MAXI J1836-194
  11. GRB 110928A: Swift-XRT refined Analysis
  12. GRB 110825A: GROND Observations
  13. GRB 110928A: Enhanced Swift-XRT position
  14. GRB 110928A: P60 Observations
  15. GRB 110928A: Further PAIRITEL NIR Observations
  16. GRB 110928A: Swift-BAT refined analysis
  17. GRB 110928A: Swift-XRT observations
  18. GRB 110928A: Swift/UVOT finding chart observation
  19. GRB 110928A: PAIRITEL NIR Observations
  20. GRB 110928A: ROTSE-III Optical Limits
  21. GRB 110928A: Swift detection of a burst
  22. Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
  23. Swift-BAT trigger 503926 is noise
  24. GRB 110924A: Swift detection of a possible burst
  25. GCN for GRB 110921B
  26. GRB 110921A: Swift/UVOT Observations
  27. GRB110918A: Lick Observations
  28. GRB 110921A: NOT observations
  29. GRB 110921A: Fermi GBM observation
  30. GRB 110921A: TNT astrometry
  31. GRB 110921A: Swift-XRT refined Analysis
  32. GRB 110921A, Swift-BAT refined analysis
  33. GRB 110918A: Liverpool Telescope optical observations
  34. GRB 110918A: submm observations from APEX
  35. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  36. GRB 110921A: Enhanced Swift-XRT position
  37. GRB 110921A: MITSuME Akeno Optical Observation
  38. GRB 110921A : TNT optical counterpart candidate
  39. GRB 110918A: Swift-XRT refined Analysis
  40. GRB 110918A: Spectroscopy from GTC
  41. GRB 110921A: MASTER-Net early limit
  42. GRB 110921A: Swift detection of a burst
  43. GRB 110915B : X-ray afterglow confirmation
  44. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  45. GRB 110918A: rest-frame energetics in gamma-gays
  46. GRB 110918A optical observation
  47. GRB 110918A: Gemini-N redshift
  48. GRB 110918A: Afterglow Confirmation from PTF
  49. GRB 110918A: GROND detection of the afterglow candidate
  50. GRB 110918A: INT optical detection of Swift candidate afterglow
  51. GRB 110918A: Swift-XRT observations
  52. GRB 110918A: pseudo-z= from prompt emission spectrum
  53. Konus-Wind observation of GRB 110918A
  54. GRB110918A: BOOTES-1 optical limit
  55. MAXI/GSC detection of a short soft X-ray transient
  56. Swift detection of short bursts from PSR J1647-4552
  57. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  58. IPN triangulation of GRB 110918A (long duration, extremely intense)
  59. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  60. GRB 110915A: Swift/UVOT Upper Limits
  61. GRB 110915B: Swift/UVOT Upper Limits
  62. GRB 110915A: GROND Upper limits
  63. GRB 110915A, Swift-BAT refined analysis
  64. GRB 110915A: Swift-XRT refined Analysis
  65. GRB 110915B: Afterglow candidate from OSN
  66. GRB 110915A: Deep Near-IR Limits from Magellan
  67. GRB 110915B: XRT afterglow candidate
  68. GRB 110903A: Suzaku WAM observation of the prompt emission
  69. GRB 110915A: Deep Gemini-South i/z-band imaging
  70. GRB110915A MITSuME Okayama J-band upper-limit
  71. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  72. GRB 110915A: NOT observations
  73. GRB 110915A: 1.23m CAHA I-band observations
  74. GRB 110915B: SuperAGILE localization of a long GRB
  75. GRB 110915A: Enhanced Swift-XRT position
  76. GRB 110915A: GMG optical upper limit
  77. GRB 110915A: MITSuME Akeno Optical upper limits
  78. GRB 110915A: MASTER-Net early limit
  79. GRB 110915A: Prompt enhanced Swift-XRT position
  80. GRB 110915A: Swift detection of a burst
  81. GRB 110825A: Further Swift/XRT Observations
  82. GRB 110731A: SAO RAS and Terskol observations
  83. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  84. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  85. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  86. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  87. GRB 110905A: KAIT observations
  88. GRB 110905A: Swift detection of a burst
  89. GRB 110903A: Fermi GBM observation
  90. GRB 110903A: Swift/UVOT Upper Limits
  91. GRB 110903A: Swift-XRT observations
  92. Konus-Wind observation of GRB 110903A
  93. GRB 110903A: a long GRB detected by INTEGRAL
  94. GRB 110820A: optical upper limit
  95. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  96. Trigger 502024: Swift detection of KS 1741-293
  97. GRB110825A: Fermi GBM observation
  98. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  99. Swift detection of an SGR burst from Swift J1834.9-0846
  100. GRB 110825A: Suzaku WAM observation of the prompt emission

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