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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 070411: Tautenburg RRM Afterglow Confirmation
  2. GRB 070411: Swift detection of a burst with optical afterglow
  3. GRB 070406: Swift XRT team further analysis
  4. Suzaku ToO observation of SGR 1806-20
  5. GRB 070406: Gemini South Imaging and XRT analysis
  6. GRB 070406: SARA upper limit
  7. GRB 070406: Xinglong TNT optical Upper Limit
  8. Konus-Wind and Konus-A observations of GRB 070402
  9. IPN triangulation of GRB070402
  10. INTEGRAL ToO Observation of SGR1806-20
  11. Konus-Wind observation of GRB 070328
  12. long burst from SGR 1806-20 detected on March 26
  13. GRB 070328: Swift/XRT Refined Analysis
  14. GRB 070328 : Suzaku ToO follow up starts
  15. Short-Hard GRB 070209: PROMPT Observations
  16. GRB 070311: a long GRB detected by INTEGRAL
  17. GRB 070125: Chandra X-ray Confirmation of Jet Break
  18. GRB 070309: A long GRB detected by INTEGRAL
  19. GRB 070306: XRT Team Refined Analysis
  20. GRB 070227: optical observations
  21. GRB 070227: optical observations
  22. GRB 070224: SARA upper limit
  23. GRB 070224, Swift-BAT refined analysis
  24. GRB 070224: MASTER-Net refind analysis
  25. GRB 070224: MASTER-VWF-Kislovodsk observations
  26. GRB 070224: MASTER observations
  27. GRB 070224: Swift detection of a burst
  28. GRB 070223: Optical observations
  29. RHESSI Spectrum of GRB070220
  30. GRB 070223, Swift-BAT refined analysis
  31. Konus-Wind and Konus-A observations of GRB 070220
  32. GRB 070220: MITSuME Okayama Optical Observation
  33. GRB 070220: ART-3 Optical and NIR limits
  34. GRB 070220: Observation with the KANATA 1.5m telescope
  35. GRB070219: MASTER-VWF-Kislovodsk observations
  36. GRB 070219, Swift-BAT refined analysis
  37. GRB 070219: ROTSE-III Optical Limits
  38. GRB070219 - SDSS Pre-Burst Observations
  39. GRB 070201: clarification on localization and Konus-Wind spectra
  40. IPN localization of very bright long hard GRB 070207
  41. IPN localization of very intense short GRB 070201
  42. GRB 070208: ROTSE-III Optical Limits
  43. GRB 070125: further AAVSO optical observations
  44. GRB 070129, Swift-BAT refined analysis of a particularly long
  45. Konus-Wind observation of GRB 070125
  46. GRB070125: Swift-XRT Refined Analysis
  47. GRB 070125: SARA detection in R
  48. RHESSI Spectrum of GRB070125
  49. Konus-Wind observation of short hard GRB 070124
  50. IPN localization of GRB070124 (short duration, hard spectrum)
  51. GRB 070110: Continued Detection and Request for Ground Followup
  52. GRB 070110: Ep,i - Eiso correlation
  53. GRB 070110 declared a "Burst of Interest" by Swift team
  54. Further Retractions of previous Swift-BAT triggers
  55. Trigger 255685: Swift detection of a possible burst
  56. GRB 070103: Swift detection of a burst
  57. Retractions of previous Swift-BAT triggers
  58. Konus-Wind observation of GRB 061222A
  59. GRB 061210: Swift/XRT Astrometry Correction
  60. GRB061222B: Swift-XRT Refined Analysis
  61. GRB 061222B: SARA upper limit
  62. GRB 061222A: Prompt ROTSE-III Optical Limits
  63. GRB 061217: Astrometry-Corrected XRT Position
  64. GRB 061217, SMARTS optical observations
  65. GRB 061217: ROTSE-III Optical Limits
  66. GRB 061214(?): ROTSE-III Optical Limits
  67. GRB 061210: Suzaku WAM observation of the prompt emission
  68. GRB 061210: Swift-BAT detection of a short burst
  69. Konus-Wind observation of GRB 061201
  70. GRB 061202, Swift-BAT refined analysis
  71. GRB 061122: GETS observation
  72. GRB 061121: Second Epoch ATCA Radio Observations
  73. GRB 061126: optical observation
  74. GRB 061126: Tautenburg afterglow observations
  75. GRB 061121: MDM Continued Monitoring
  76. GRB 061121: MDM Optical Decay
  77. GRB 061121: ART detection in Ic
  78. Konus-Wind observation of GRB 061122
  79. Konus-Wind and Konus-A observations of GRB 061121
  80. INTEGRAL results on GRB 061122
  81. GRB 061122A: a long GRB detected by INTEGRAL
  82. GRB 061121, Swift-BAT refined analysis
  83. GRB 061121: Faulkes Telescope North Optical Observation
  84. GRB 060111B: Swift UVOT Refined Magnitudes
  85. GRB061110B: Optical observations at Crni Vrh
  86. GRB 061110B: NOT optical observations
  87. GRB 061110: ROTSE-III Optical Limits
  88. GRB061019: second epoch CrAO observations
  89. GRB061102B: Super-LOTIS observations
  90. GRB 061028: Optical R passband observations
  91. GRB 061028: z band imaging
  92. GRB 061027, Swift refined analysis of a possible burst
  93. GRB061025: Swift XRT refined analysis
  94. GRB 061025: Gemini-S observations
  95. GRB061025: Swift XRT position
  96. GRB 061025: ROTSE-III Optical Limits
  97. GRB 061025: a long GRB detected by INTEGRAL
  98. Konus-Wind observation of GRB 061021
  99. GRB 061021: Swift-XRT refined analysis
  100. GRB 061021: Swift detection of a burst

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