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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').

10639 results found.

  1. GRB 070805: Swift XRT initial analysis.
  2. Swift detection of a outburst from SAX J1810.8-2609
  3. GRB 070802, Swift-BAT refined analysis
  4. GRB 070802: GROND J band candidate
  5. Konus-A observation of GRB 070729
  6. AGILE-ACS position for the SGR 1806-20 July 27 burst
  7. Intense burst from SGR 1806-20 detected on July 27
  8. Konus-Wind observation of GRB 070724B
  9. GRB 070724B: Analysis of AGILE gamma-ray data
  10. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  11. GRB 060814 - Keck host detection and redshift
  12. Short-Hard GRB070714B: PROMPT Observations
  13. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  14. GRB 070721B, Swift-BAT refined analysis
  15. GRB 070714B : Suzaku WAM observation of the prompt emission
  16. GRB 070714A: Swift-BAT T_zero
  17. GRB 070616: No Evidence for I Band Afterglow
  18. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  19. SN 2007bg - off-axis GRB?
  20. GRB 070704: RTT150 optical observations
  21. GRB 070704: Suzaku/WAM observation of the prompt emission
  22. Konus-Wind observation of GRB 070707
  23. GRB 070707: VLT observations
  24. GRB070704: FAVOR optical observations
  25. Konus-Wind observation of GRB 070626
  26. Swift/UVOT Observations of GRB070704
  27. GRB 070704: Correction to GCN Circ 6594
  28. GRB 070704: Swift detection of a burst
  29. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  30. GRB 070628, Swift-BAT refined analysis
  31. GRB 070628: Watcher Observations
  32. Swift UVOT Observations of GRB 070628
  33. GRB 070628: Swift detection of a possible burst
  34. GRB 070612A: Second Epoch WSRT Radio Observations
  35. GRB 070621: Swift-BAT refined analysis
  36. GRB 070621: ROTSE-III Prompt Optical Limits
  37. GRB 070621: Swift detection of a burst
  38. Swift/UVOT observations of GRB070616
  39. GRB 070615: A long GRB detected by INTEGRAL
  40. SWIFT J195509.6+261406 (GRB 070610): further observations
  41. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  42. GRB 070612A, Swift-BAT refined analysis
  43. GRB 070612A: SARA detection of possible OT
  44. GRB 070612B: Swift detection of a burst
  45. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  46. GRB 070610: Watcher Observations
  47. GRB 070611: ROTSE-III Optical Limits
  48. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  49. GRB 070610, Swift-BAT refined analysis
  50. GRB 070610: Swift detection of a burst
  51. GRB 070419A, deep LBT photometry and possible supernova detection
  52. GRB070520B: optical observations
  53. GRB070520: optical observation
  54. GRB070518: optical observation
  55. GRB070521: optical observation
  56. Swift/UVOT refined analysis of GRB070531
  57. GRB 070531: Swift-BAT refined analysis
  58. GRB 070531: Swift detection of a burst
  59. Swift/UVOT refined analysis of GRB070529
  60. GRB 070529: MARGE Observations
  61. Konus-Wind observation of GRB 070521
  62. GROND upper limits of GRB 070521
  63. GRB 070520A: SARA upper limit
  64. GRB 070521: SARA upper limit
  65. GRB 070521: optical limit by Pi of the Sky
  66. GRB 070521: Swift detection of a burst
  67. GRB 070520: Xinglong EST optical Upper Limit
  68. GRB 070517: Swift detection of a burst
  69. GRB 070512: IPN localization and Konus spectrum of a bright burst
  70. GRB070419A: optical observations
  71. Konus-Wind and Konus-A observation of GRB 070508
  72. RHESSI Spectrum of GRB070508
  73. GRB 070508: Suzaku/WAM observation of the prompt emission
  74. GRB 070509: ROTSE-III Optical Limits
  75. GRB 070508, Swift-BAT refined analysis
  76. GRB 070508: Optical observation limiting magnitude
  77. GRB 070508: Optical afterglow detection
  78. GRB 070508: Swift detection of an intense burst with an optical counterpart
  79. GRB 070429A: Swift XRT refined analysis
  80. GRB 070429B: Swift XRT refined analysis
  81. GRB 070429B: ROTSE-III Optical Limits
  82. GRB 070429: ROTSE-III Optical Limits
  83. GRB 070427, Swift-BAT Refined Analysis
  84. GRB 070420, SMARTS optical/IR afterglow observations
  85. Konus-Wind observation of GRB 070420
  86. GRB070420: Swift UVOT continuing observations
  87. GRB 070420: NIR and optical afterglow confirmed
  88. GRB 070419A: Early Super-LOTIS Observations
  89. GRB 070419A: SARA observations
  90. GRB 070419B optical afterglow candidate
  91. GRB 070419B: optical afterglow candidate
  92. GRB 070419A: ROTSE-III Optical Limits
  93. GRB 070419: Swift detection of a burst
  94. GRB 070318, SMARTS optical/IR afterglow observations
  95. GRB 070411: Swift/UVOT observations
  96. GRB 070411: Optical photometry at Crni Vrh
  97. GRB 070411, Swift-BAT refined analysis
  98. GRB 070411 : Liverpool Telescope Observations
  99. GRB 070411: Optical observations at Crni Vrh
  100. GRB 070411: ROTSE-III Detection of Optical Counterpart

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