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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"

5184 results found.

  1. GRB 120224A: optical observation in Mondy observatory
  2. GRB 120224A: FTN optical observations
  3. Fermi GBM detection of an SGR-like burst
  4. Skynet/PROMPT observations of GRB120215A
  5. GRB 120213A: Enhanced Swift-XRT position
  6. GRB 120213A: Swift-BAT refined analysis
  7. GRB 120213A: Prompt enhanced Swift-XRT position
  8. GRB 120213A: Swift detection of a burst
  9. GRB 120212A: NOT optical observation
  10. GRB 120211A: MASTER early optical observations
  11. GRB 120211A - Faulkes Telescope South Observations
  12. Swift detection of a burst from LS I +61 303
  13. GRB 111225A: optical observations
  14. GRB 120119A: optical observations
  15. GRB 120119A: Swift detection of a burst with an optical counterpart
  16. XRF 120118A: early optical limit by "Pi of the Sky"
  17. GRB 120118B: MASTER optical observations
  18. GRB 120118B: Swift detection of a burst
  19. AXP 4U 1042+61: Mondy optical observations
  20. GRB 120116A: Mondy optical observations
  21. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  22. GRB 120106A: optical upper limit
  23. Swift detection of an SGR burst from AXP 4U 0142+61
  24. GRB 120107A: Suzaku WAM observation of the prompt emission
  25. GRB 120106A: Swift detection of a burst
  26. GRB 120102A: Swift/UVOT Detection
  27. GRB 120102A: Swift detection of a burst with an optical counterpart
  28. GRB 111228A: MASTER-Net optical photometry
  29. GRB111228A: Further GMG observations
  30. FERMI GRB111228.45: MASTER observations
  31. GRB111222A: GMG optical observation
  32. XRT GRB Catalogue now live and online
  33. GRB 111209A: IRTF NIR Imaging/Spectroscopy
  34. GRB 111204A, Swift-BAT refined analysis
  35. GRB 111204A: MASTER optical observations
  36. GRB 111123A, GROND observations
  37. GRB 111121A: Swift detection of a short hard burst
  38. GRB 111117A: optical upper limit in CrAO
  39. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  40. Continued Skynet observations of GRB111107A
  41. GRB 111107A: Swift detection of a burst with an optical counterpart
  42. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  43. GRB 111022B: MASTER OT observations
  44. IPN Triangulation of GRB 111016B (long duration, intense)
  45. GRB 111018A: Swift detection of a burst
  46. Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
  47. MAXI/GSC detection of a short soft X-ray transient
  48. GRB 110915B: SuperAGILE localization of a long GRB
  49. GRB 110731A: SAO RAS and Terskol observations
  50. IPN triangulation of GRB110825A (very intense, long-duration)
  51. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  52. IPN triangulation of GRB110815A (long, intense)
  53. IPN triangulation of GRB 110808B (short/hard/intense)
  54. SGR J1834.9-0846: A Neutron Star in W41?
  55. Konus-Wind observation of GRB 110802A
  56. GRB 110801A: SAO RAS optical observations
  57. GRB 110801A: Evidence for a jet break
  58. GRB 110801A: MASTER OT observations
  59. AXP 4U 0142+61: Fermi GBM detection
  60. AXP 4U 0142+61: Swift-BAT refined analysis
  61. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  62. GRB 110709A: Suzaku WAM observation of the prompt emission
  63. Konus-Wind observation of GRB 110709A
  64. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  65. GRB 110709A: Fermi GBM observation
  66. GRB 110709A: Swift detection of a burst
  67. GRB 110625A: Suzaku WAM observation of the prompt emission
  68. GRB 110625A: GROND detection of a source inside the XRT error circle
  69. Konus-Wind observation of GRB 110625A
  70. GRB 110610A: Swift detection of a burst
  71. GRB 110530A: optical observations at Mt. Terskol
  72. GRB 110520A: Swift detection of a burst
  73. GRB 110519A: Swift detection of a burst
  74. GRB 110503A: R-band Detection
  75. GRB 110422A: Update of Herschel FIR observation schedule
  76. GRB 110422A: optical observations in CrAO, second epoch
  77. GRB 110420A: Swift detection of a burst with optical counterpart
  78. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  79. GRB 110414A : Faulkes Telescope North observations
  80. GRB 110411A: MASTER prompt and follow-up optical limits
  81. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  82. GRB 100407A : Errata of afterglow position in GCN 11899
  83. GRB 110407A : Lulin optical afterglow detection
  84. GRB 110407A: Prompt enhanced Swift-XRT position
  85. GRB 110402A: further NOT observations
  86. GRB 110328A / Swift J164449.3+573451: Infrared transient
  87. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  88. Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
  89. GRB 110319B: GROND upper limits
  90. GRB 110301A: Fermi GBM detection
  91. Swift XRT and UVOT Observations of OT 110215
  92. OT 110215: NIR observations from NOT of GRB candidate
  93. OT 110215: possible GRB from 2MASS J00264184+8324093
  94. GRB 110213A: THO optical observations
  95. GRB 110212A: SARA-N Optical Limits
  96. GRB110205A: MITSuME Ishigakijima Optical Observation
  97. GRB 110205A: GRAS005 optical observations
  98. GRB 110106B, radio observations
  99. GRB 110120A: MASTER optical observations
  100. GRB 110120A: MASTER optical observations

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