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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"

11452 results found.

  1. GRB 070419A: Early Super-LOTIS Observations
  2. GRB 070419A: SARA observations
  3. GRB 070419B optical afterglow candidate
  4. GRB 070419B: optical afterglow candidate
  5. GRB 070419A: ROTSE-III Optical Limits
  6. GRB 070419: Swift detection of a burst
  7. GRB 070318, SMARTS optical/IR afterglow observations
  8. GRB 070411: Swift/UVOT observations
  9. GRB 070411: Optical photometry at Crni Vrh
  10. GRB 070411, Swift-BAT refined analysis
  11. GRB 070411 : Liverpool Telescope Observations
  12. GRB 070411: Optical observations at Crni Vrh
  13. GRB 070411: ROTSE-III Detection of Optical Counterpart
  14. GRB 070411: Tautenburg RRM Afterglow Confirmation
  15. GRB 070411: Swift detection of a burst with optical afterglow
  16. GRB 070406: Swift XRT team further analysis
  17. Suzaku ToO observation of SGR 1806-20
  18. GRB 070406: Gemini South Imaging and XRT analysis
  19. GRB 070406: SARA upper limit
  20. GRB 070406: Xinglong TNT optical Upper Limit
  21. Konus-Wind and Konus-A observations of GRB 070402
  22. IPN triangulation of GRB070402
  23. INTEGRAL ToO Observation of SGR1806-20
  24. Konus-Wind observation of GRB 070328
  25. long burst from SGR 1806-20 detected on March 26
  26. GRB 070328: Swift/XRT Refined Analysis
  27. GRB 070328 : Suzaku ToO follow up starts
  28. Short-Hard GRB 070209: PROMPT Observations
  29. GRB 070311: a long GRB detected by INTEGRAL
  30. GRB 070125: Chandra X-ray Confirmation of Jet Break
  31. GRB 070309: A long GRB detected by INTEGRAL
  32. GRB 070306: XRT Team Refined Analysis
  33. GRB 070227: optical observations
  34. GRB 070227: optical observations
  35. GRB 070224: SARA upper limit
  36. GRB 070224, Swift-BAT refined analysis
  37. GRB 070224: MASTER-Net refind analysis
  38. GRB 070224: MASTER-VWF-Kislovodsk observations
  39. GRB 070224: MASTER observations
  40. GRB 070224: Swift detection of a burst
  41. GRB 070223: Optical observations
  42. RHESSI Spectrum of GRB070220
  43. GRB 070223, Swift-BAT refined analysis
  44. Konus-Wind and Konus-A observations of GRB 070220
  45. GRB 070220: MITSuME Okayama Optical Observation
  46. GRB 070220: ART-3 Optical and NIR limits
  47. GRB 070220: Observation with the KANATA 1.5m telescope
  48. GRB070219: MASTER-VWF-Kislovodsk observations
  49. GRB 070219, Swift-BAT refined analysis
  50. GRB 070219: ROTSE-III Optical Limits
  51. GRB070219 - SDSS Pre-Burst Observations
  52. GRB 070201: clarification on localization and Konus-Wind spectra
  53. IPN localization of very bright long hard GRB 070207
  54. IPN localization of very intense short GRB 070201
  55. GRB 070208: ROTSE-III Optical Limits
  56. GRB 070125: further AAVSO optical observations
  57. GRB 070129, Swift-BAT refined analysis of a particularly long
  58. Konus-Wind observation of GRB 070125
  59. GRB070125: Swift-XRT Refined Analysis
  60. GRB 070125: SARA detection in R
  61. RHESSI Spectrum of GRB070125
  62. Konus-Wind observation of short hard GRB 070124
  63. IPN localization of GRB070124 (short duration, hard spectrum)
  64. GRB 070110: Continued Detection and Request for Ground Followup
  65. GRB 070110: Ep,i - Eiso correlation
  66. GRB 070110 declared a "Burst of Interest" by Swift team
  67. Further Retractions of previous Swift-BAT triggers
  68. Trigger 255685: Swift detection of a possible burst
  69. GRB 070103: Swift detection of a burst
  70. Retractions of previous Swift-BAT triggers
  71. Konus-Wind observation of GRB 061222A
  72. GRB 061210: Swift/XRT Astrometry Correction
  73. GRB061222B: Swift-XRT Refined Analysis
  74. GRB 061222B: SARA upper limit
  75. GRB 061222A: Prompt ROTSE-III Optical Limits
  76. GRB 061217: Astrometry-Corrected XRT Position
  77. GRB 061217, SMARTS optical observations
  78. GRB 061217: ROTSE-III Optical Limits
  79. GRB 061214(?): ROTSE-III Optical Limits
  80. GRB 061210: Suzaku WAM observation of the prompt emission
  81. GRB 061210: Swift-BAT detection of a short burst
  82. Konus-Wind observation of GRB 061201
  83. GRB 061202, Swift-BAT refined analysis
  84. GRB 061122: GETS observation
  85. GRB 061121: Second Epoch ATCA Radio Observations
  86. GRB 061126: optical observation
  87. GRB 061126: Tautenburg afterglow observations
  88. GRB 061121: MDM Continued Monitoring
  89. GRB 061121: MDM Optical Decay
  90. GRB 061121: ART detection in Ic
  91. Konus-Wind observation of GRB 061122
  92. Konus-Wind and Konus-A observations of GRB 061121
  93. INTEGRAL results on GRB 061122
  94. GRB 061122A: a long GRB detected by INTEGRAL
  95. GRB 061121, Swift-BAT refined analysis
  96. GRB 061121: Faulkes Telescope North Optical Observation
  97. GRB 060111B: Swift UVOT Refined Magnitudes
  98. GRB061110B: Optical observations at Crni Vrh
  99. GRB 061110B: NOT optical observations
  100. GRB 061110: ROTSE-III Optical Limits

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