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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').
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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"

4255 results found.

  1. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  2. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  3. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  4. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  5. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  6. GRB 130912A: 5.8 GHz VLA upper limit
  7. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  8. GRB 130831A: T100 observations
  9. GRB 130831A: THO optical observation
  10. GRB 130831A: Optical Observations via Virtual Telescope
  11. GRB 130831A: Montarrenti Observatory optical observations
  12. GRB 130831A: Skynet/PROMPT-SSO detections
  13. GRB 130831A: Swift detection of a burst with an optical counterpart
  14. GRB 130829A: AAO optical observations
  15. GRB 130829A: NOT optical observations
  16. GRB 130623A: GROND detection of the optical/NIR afterglow
  17. GRB 130806A: MITSuME Okayama upper limits
  18. IPN localization of GRB 130804A
  19. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  20. Trigger 565443: Swift detection of a burst from SGR J1745-29
  21. GRB 130803A, Swift-BAT refined analysis
  22. GRB 130803A: Enhanced Swift-XRT position
  23. GRB 130803A: Swift detection of a burst
  24. GRB 130722A: Faulkes Telescope South optical candidate
  25. Fermi GRB 130702A: Swift XRT and UVOT observations
  26. Swift Trigger 558631 is not a real source
  27. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  28. GRB 130612A: ISON-NM optical observations
  29. GRB 130608A: Further Swift-BAT analysis
  30. GRB 130608A: Swift-BAT refined analysis
  31. GRB 130608A: Swift detection of a burst
  32. GRB 130606A: EVLA detection
  33. Trigger 557640: Swift detection of burst from SGR J1745-29
  34. GRB 130606A:T100 observations
  35. GRB130606A: Montarrenti Observatory afterglow detection
  36. Virtual Telescope observations of GRB 130606A
  37. GRB 130606A: IRSF NIR Observation
  38. GRB 130606A: NOT afterglow detection
  39. GRB 130605A: Swift detection of a burst
  40. GRB 130603A: MITSuME Okayama Optical Observation
  41. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  42. GRB 130504C: Suzaku WAM observation of the prompt emission
  43. GRB 130427A: Amateur observations from Sweden
  44. Refined IPN Triangulation of GRB 130502B
  45. GRB 130505A, Swift-BAT refined analysis
  46. Konus-Wind observation of GRB 130504C
  47. Swift/UVOT observations of GRB130505A
  48. GRB 130505A: iTelescope T12 optical observations
  49. GRB 130505A: Enhanced Swift-XRT position
  50. GRB 130505A: MAXI/GSC detection
  51. GRB 130505A: Swift detection of a burst with optical afterglow
  52. GRB 130427A: Non-observation of VHE emission with HAWC
  53. GRB 130427A: KAIT optical observations
  54. GRB 130427A: SARA-N optical observations
  55. GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
  56. GRB 130427A: Challis Observatory optical observations
  57. GRB 130427A: Continued Skynet/PROMPT Observations
  58. GRB 130427A: further GMG observations
  59. GRB 130427A: SARA-N detection
  60. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  61. GRB 130427A: Optical Observations
  62. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  63. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  64. GRB 130420A: ROTSE-III data analysis
  65. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  66. Swift Trigger 554135 is probably not a GRB or transient
  67. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  68. GRB 130420A: Swift detection of a burst with an optical counterpart
  69. GRB 130419A: Swift detection of a burst
  70. Konus-Wind observation of GRB 130408A
  71. GRB 130211A: Retraction of afterglow candidate
  72. Konus-Wind observation of GRB 130320B
  73. IPN Triangulation of GRB 130320B (very long/bright)
  74. Swift XRT observations of GRB 130310A
  75. GRB 130306A: Swift detection of a burst
  76. GRB 130305A: Fermi GBM observation
  77. GRB 121128A: optical observations in Mondy observatory
  78. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  79. Trigger 549841: Swift detection of SGR1806-20
  80. IPN Triangulation of GRB 130219A
  81. GRB 130215A: Additional P200 NIR observations
  82. GRB 130215A: P60 Observations
  83. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  84. Swift Trigger 547142: a probable Galactic source
  85. GRB 121229A: VLT/X-shooter redshift
  86. GRB 121229A: MAXI/GSC detection
  87. GRB 121229A: GROND detection of the afterglow
  88. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  89. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  90. GRB 121211A: MITSuME Okayama Optical Observation
  91. GRB 121127A: Suzaku WAM observation of the prompt emission
  92. GRB 121128A: optical observation in Mondy observatory
  93. IPN Triangulation of GRB 121127A (short/hard)
  94. GRB 121123A: Swift/UVOT Observations
  95. GRB 121123A: Swift-XRT refined Analysis
  96. GRB 121123A: NOT optical observations
  97. GRB 121123A: Swift detection of a burst with optical counterpart
  98. GRB 121108A: MITSuME Ishigakijima upper limits
  99. GRB 121108A: Swift detection of a burst
  100. GRB 121027A - Gemini South spectroscopy

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