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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"

11375 results found.

  1. SGR 0501+4516: Detection of possible optical counterpart
  2. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  3. VLA non-detection of SGR 0501+4516
  4. Radio Detection of SGR 0501+4516: Retraction
  5. SGR 0501+4516: XMM-Newton monitoring schedule
  6. GRB 080828: SuperAGILE GRB Localization
  7. SGR 0501+4516: Decline in Activity
  8. SGR 0501+4516: Proximity to supernova remnant HB9
  9. Enhanced Swift-XRT position of SGR 0501+4516
  10. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  11. SGR 0501+4516: Swift XRT measure of the spin period
  12. GRB080823: Fermi Gamma-ray Burst Monitor detection
  13. Konus-Wind observation of GRB 080825B
  14. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  15. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  16. Suzaku ToO Observation of SGR 0501+4516
  17. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  18. GRB 080825B: GRB Localization by SuperAGILE
  19. Konus-Wind observations of new SGR 0501+4516
  20. INTEGRAL ToO Observation of SGR0501+4516
  21. Radio Detection of SGR 0501+4516
  22. SGR 0501+4516: MDM Optical Observations
  23. GRB 080822B, Swift-BAT refined analysis
  24. SGR 0501+4516: Astrotel-Caucasus optical observations
  25. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  26. SGR 0501+4516: WSRT Radio Observations
  27. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  28. SGR 0501+4516: optical observations
  29. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  30. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  31. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  32. Third event from SGR 0501+4516
  33. GRB 080822 (SGR 0501+4516): archival optical observations
  34. New Soft Gamma Repeater 0501+4516 was GRB 080822
  35. GRB 080822: Swift detection of a short burst
  36. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  37. GLAST Burst Monitor detection of GRB 080810
  38. GRB 080810: Swift-XRT Team refined analysis
  39. GRB 080810, Swift-BAT refined analysis
  40. GRB 080805: Swift-XRT Refined Analysis
  41. GRB080805 optical limit by "Pi of the Sky"
  42. GRB 080805: Swift detection of a burst
  43. GRB 080804: Swift detection of a burst with optical afterglow
  44. GRB 080804: ROTSE-III Detection of Optical Counterpart
  45. GRB 080802: Swift detection of a probable burst
  46. GRB 080727B: KAIT photometry and an early lightcurve break
  47. Konus-Wind observation of GRB 080727B
  48. GRB 080727A: Swift-XRT refined analysis
  49. GRB 080727B: KAIT observations
  50. GRB 080727B: Swift detection of a bright burst
  51. GRB 080727: Swift detection of a burst
  52. GRB 080726: GRB Localization by SuperAGILE
  53. GRB 080725, Swift-BAT refined analysis
  54. GRB 080723A: optical upper limit
  55. Konus-Wind observation of GRB 080723B
  56. GRB 080723, Swift-BAT refined analysis
  57. GRB 080723B: Detection and Localization by SuperAGILE
  58. GRB 080723B : a long GRB detected with INTEGRAL
  59. GRB 080723: Swift detection of a burst
  60. Konus-Wind observation of GRB 080721
  61. Retraction of Swift Trigger 317393
  62. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  63. Konus-Wind observation of GRB 080714
  64. GRB 080603B: optical observations in CrAO
  65. GRB 080710: Swift-XRT refined analysis
  66. GRB 080710: KAIT OA candidate
  67. GRB 080710: Swift XRT position
  68. GRB 080710: Swift detection of a burst
  69. GRB 080707: Swift XRT refined analysis
  70. GRB 080707: Swift detection of a burst
  71. GRB 080702B Swift-BAT refined analysis
  72. GRB 080702A: MITSuME Akeno optical upper limits
  73. Swift Trigger 315630: Probably not a GRB
  74. GRB 080701A: Early Super-LOTIS Observations
  75. GRB 080701A, Swift-BAT refined analysis
  76. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  77. GRB 070809: Putative host galaxy and redshift
  78. Konus-Wind observation of GRB 080613B
  79. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  80. GRB 080613 : a long GRB detected with INTEGRAL
  81. GRB 080603b: optical observation
  82. GRB080605: optical observation with the MITSuME-OAO telescope
  83. Konus-Wind observation of GRB 080607
  84. GRB 080607: Swift-XRT refined analysis
  85. Konus-Wind observation of GRB 080605
  86. GRB 080607: Keck/LRIS spectroscopy and redshift
  87. GRB 080605, Swift-BAT refined analysis
  88. GRB 080605, Swift-BAT refined analysis
  89. GRB 080605: MASTER VWF 46 s AT observation
  90. Swift/UVOT observations of GRB080604
  91. Konus-Wind observation of GRB 080603B
  92. GRB 080603B, Swift-BAT refined analysis
  93. GRB 080603A: Swift/UVOT detection of the afterglow
  94. GRB080603B: RTT150 optical observations, break in light curves
  95. GRB 080604: Early Super-LOTIS Observations
  96. GRB080604: confirmation of optical afterglow
  97. GRB 080604: Swift detection of a burst with an optical afterglow
  98. GRB 080516: TAROT La Silla observatory optical observations
  99. GRB 080603B: BOOTES2/TELMA optical observations
  100. GRB 080603: A long GRB detected by INTEGRAL

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