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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"

11504 results found.

  1. GRB 070429: ROTSE-III Optical Limits
  2. GRB 070427, Swift-BAT Refined Analysis
  3. GRB 070420, SMARTS optical/IR afterglow observations
  4. Konus-Wind observation of GRB 070420
  5. GRB070420: Swift UVOT continuing observations
  6. GRB 070420: NIR and optical afterglow confirmed
  7. GRB 070419A: Early Super-LOTIS Observations
  8. GRB 070419A: SARA observations
  9. GRB 070419B optical afterglow candidate
  10. GRB 070419B: optical afterglow candidate
  11. GRB 070419A: ROTSE-III Optical Limits
  12. GRB 070419: Swift detection of a burst
  13. GRB 070318, SMARTS optical/IR afterglow observations
  14. GRB 070411: Swift/UVOT observations
  15. GRB 070411: Optical photometry at Crni Vrh
  16. GRB 070411, Swift-BAT refined analysis
  17. GRB 070411 : Liverpool Telescope Observations
  18. GRB 070411: Optical observations at Crni Vrh
  19. GRB 070411: ROTSE-III Detection of Optical Counterpart
  20. GRB 070411: Tautenburg RRM Afterglow Confirmation
  21. GRB 070411: Swift detection of a burst with optical afterglow
  22. GRB 070406: Swift XRT team further analysis
  23. Suzaku ToO observation of SGR 1806-20
  24. GRB 070406: Gemini South Imaging and XRT analysis
  25. GRB 070406: SARA upper limit
  26. GRB 070406: Xinglong TNT optical Upper Limit
  27. Konus-Wind and Konus-A observations of GRB 070402
  28. IPN triangulation of GRB070402
  29. INTEGRAL ToO Observation of SGR1806-20
  30. Konus-Wind observation of GRB 070328
  31. long burst from SGR 1806-20 detected on March 26
  32. GRB 070328: Swift/XRT Refined Analysis
  33. GRB 070328 : Suzaku ToO follow up starts
  34. Short-Hard GRB 070209: PROMPT Observations
  35. GRB 070311: a long GRB detected by INTEGRAL
  36. GRB 070125: Chandra X-ray Confirmation of Jet Break
  37. GRB 070309: A long GRB detected by INTEGRAL
  38. GRB 070306: XRT Team Refined Analysis
  39. GRB 070227: optical observations
  40. GRB 070227: optical observations
  41. GRB 070224: SARA upper limit
  42. GRB 070224, Swift-BAT refined analysis
  43. GRB 070224: MASTER-Net refind analysis
  44. GRB 070224: MASTER-VWF-Kislovodsk observations
  45. GRB 070224: MASTER observations
  46. GRB 070224: Swift detection of a burst
  47. GRB 070223: Optical observations
  48. RHESSI Spectrum of GRB070220
  49. GRB 070223, Swift-BAT refined analysis
  50. Konus-Wind and Konus-A observations of GRB 070220
  51. GRB 070220: MITSuME Okayama Optical Observation
  52. GRB 070220: ART-3 Optical and NIR limits
  53. GRB 070220: Observation with the KANATA 1.5m telescope
  54. GRB070219: MASTER-VWF-Kislovodsk observations
  55. GRB 070219, Swift-BAT refined analysis
  56. GRB 070219: ROTSE-III Optical Limits
  57. GRB070219 - SDSS Pre-Burst Observations
  58. GRB 070201: clarification on localization and Konus-Wind spectra
  59. IPN localization of very bright long hard GRB 070207
  60. IPN localization of very intense short GRB 070201
  61. GRB 070208: ROTSE-III Optical Limits
  62. GRB 070125: further AAVSO optical observations
  63. GRB 070129, Swift-BAT refined analysis of a particularly long
  64. Konus-Wind observation of GRB 070125
  65. GRB070125: Swift-XRT Refined Analysis
  66. GRB 070125: SARA detection in R
  67. RHESSI Spectrum of GRB070125
  68. Konus-Wind observation of short hard GRB 070124
  69. IPN localization of GRB070124 (short duration, hard spectrum)
  70. GRB 070110: Continued Detection and Request for Ground Followup
  71. GRB 070110: Ep,i - Eiso correlation
  72. GRB 070110 declared a "Burst of Interest" by Swift team
  73. Further Retractions of previous Swift-BAT triggers
  74. Trigger 255685: Swift detection of a possible burst
  75. GRB 070103: Swift detection of a burst
  76. Retractions of previous Swift-BAT triggers
  77. Konus-Wind observation of GRB 061222A
  78. GRB 061210: Swift/XRT Astrometry Correction
  79. GRB061222B: Swift-XRT Refined Analysis
  80. GRB 061222B: SARA upper limit
  81. GRB 061222A: Prompt ROTSE-III Optical Limits
  82. GRB 061217: Astrometry-Corrected XRT Position
  83. GRB 061217, SMARTS optical observations
  84. GRB 061217: ROTSE-III Optical Limits
  85. GRB 061214(?): ROTSE-III Optical Limits
  86. GRB 061210: Suzaku WAM observation of the prompt emission
  87. GRB 061210: Swift-BAT detection of a short burst
  88. Konus-Wind observation of GRB 061201
  89. GRB 061202, Swift-BAT refined analysis
  90. GRB 061122: GETS observation
  91. GRB 061121: Second Epoch ATCA Radio Observations
  92. GRB 061126: optical observation
  93. GRB 061126: Tautenburg afterglow observations
  94. GRB 061121: MDM Continued Monitoring
  95. GRB 061121: MDM Optical Decay
  96. GRB 061121: ART detection in Ic
  97. Konus-Wind observation of GRB 061122
  98. Konus-Wind and Konus-A observations of GRB 061121
  99. INTEGRAL results on GRB 061122
  100. GRB 061122A: a long GRB detected by INTEGRAL

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