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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

4871 results found.

  1. GRB 120119A: optical observations
  2. GRB 120119A: Swift detection of a burst with an optical counterpart
  3. XRF 120118A: early optical limit by "Pi of the Sky"
  4. GRB 120118B: MASTER optical observations
  5. GRB 120118B: Swift detection of a burst
  6. AXP 4U 1042+61: Mondy optical observations
  7. GRB 120116A: Mondy optical observations
  8. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  9. GRB 120106A: optical upper limit
  10. Swift detection of an SGR burst from AXP 4U 0142+61
  11. GRB 120107A: Suzaku WAM observation of the prompt emission
  12. GRB 120106A: Swift detection of a burst
  13. GRB 120102A: Swift/UVOT Detection
  14. GRB 120102A: Swift detection of a burst with an optical counterpart
  15. GRB 111228A: MASTER-Net optical photometry
  16. GRB111228A: Further GMG observations
  17. FERMI GRB111228.45: MASTER observations
  18. GRB111222A: GMG optical observation
  19. XRT GRB Catalogue now live and online
  20. GRB 111209A: IRTF NIR Imaging/Spectroscopy
  21. GRB 111204A, Swift-BAT refined analysis
  22. GRB 111204A: MASTER optical observations
  23. GRB 111123A, GROND observations
  24. GRB 111121A: Swift detection of a short hard burst
  25. GRB 111117A: optical upper limit in CrAO
  26. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  27. Continued Skynet observations of GRB111107A
  28. GRB 111107A: Swift detection of a burst with an optical counterpart
  29. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  30. GRB 111022B: MASTER OT observations
  31. IPN Triangulation of GRB 111016B (long duration, intense)
  32. GRB 111018A: Swift detection of a burst
  33. Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
  34. MAXI/GSC detection of a short soft X-ray transient
  35. GRB 110915B: SuperAGILE localization of a long GRB
  36. GRB 110731A: SAO RAS and Terskol observations
  37. IPN triangulation of GRB110825A (very intense, long-duration)
  38. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  39. IPN triangulation of GRB110815A (long, intense)
  40. IPN triangulation of GRB 110808B (short/hard/intense)
  41. SGR J1834.9-0846: A Neutron Star in W41?
  42. Konus-Wind observation of GRB 110802A
  43. GRB 110801A: SAO RAS optical observations
  44. GRB 110801A: Evidence for a jet break
  45. GRB 110801A: MASTER OT observations
  46. AXP 4U 0142+61: Fermi GBM detection
  47. AXP 4U 0142+61: Swift-BAT refined analysis
  48. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  49. GRB 110709A: Suzaku WAM observation of the prompt emission
  50. Konus-Wind observation of GRB 110709A
  51. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  52. GRB 110709A: Fermi GBM observation
  53. GRB 110709A: Swift detection of a burst
  54. GRB 110625A: Suzaku WAM observation of the prompt emission
  55. GRB 110625A: GROND detection of a source inside the XRT error circle
  56. Konus-Wind observation of GRB 110625A
  57. GRB 110610A: Swift detection of a burst
  58. GRB 110530A: optical observations at Mt. Terskol
  59. GRB 110520A: Swift detection of a burst
  60. GRB 110519A: Swift detection of a burst
  61. GRB 110503A: R-band Detection
  62. GRB 110422A: Update of Herschel FIR observation schedule
  63. GRB 110422A: optical observations in CrAO, second epoch
  64. GRB 110420A: Swift detection of a burst with optical counterpart
  65. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  66. GRB 110414A : Faulkes Telescope North observations
  67. GRB 110411A: MASTER prompt and follow-up optical limits
  68. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  69. GRB 100407A : Errata of afterglow position in GCN 11899
  70. GRB 110407A : Lulin optical afterglow detection
  71. GRB 110407A: Prompt enhanced Swift-XRT position
  72. GRB 110402A: further NOT observations
  73. GRB 110328A / Swift J164449.3+573451: Infrared transient
  74. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  75. Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
  76. GRB 110319B: GROND upper limits
  77. GRB 110301A: Fermi GBM detection
  78. Swift XRT and UVOT Observations of OT 110215
  79. OT 110215: NIR observations from NOT of GRB candidate
  80. OT 110215: possible GRB from 2MASS J00264184+8324093
  81. GRB 110213A: THO optical observations
  82. GRB 110212A: SARA-N Optical Limits
  83. GRB110205A: MITSuME Ishigakijima Optical Observation
  84. GRB 110205A: GRAS005 optical observations
  85. GRB 110106B, radio observations
  86. GRB 110120A: MASTER optical observations
  87. GRB 110120A: MASTER optical observations
  88. GRB110119A: MITSuME Okayama optical upper limits
  89. New feature in Fermi GBM GRB Ground Position Notices
  90. Short GRB 110112B : early optical limit by "Pi of the Sky"
  91. GRB 110112B: Fermi GBM observation
  92. GRB 110112B: A short GRB detected by INTEGRAL
  93. GRB 110112A: MASTER optical observations
  94. GRB 110106B: MASTER optical observations
  95. GRB 110112A: Swift detection of a possible short burst
  96. GRB 110106B: Swift-XRT refined Analysis
  97. GRB 101225A: Swift-XRT refined Analysis
  98. GRB 101224A: Fermi GBM observation
  99. GRB101224A: MITSuME Okayama optical upper limits
  100. GRB 101219B: Swift-XRT refined Analysis

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