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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

11761 results found.

  1. GRB 070224: MASTER-VWF-Kislovodsk observations
  2. GRB 070224: MASTER observations
  3. GRB 070224: Swift detection of a burst
  4. GRB 070223: Optical observations
  5. RHESSI Spectrum of GRB070220
  6. GRB 070223, Swift-BAT refined analysis
  7. Konus-Wind and Konus-A observations of GRB 070220
  8. GRB 070220: MITSuME Okayama Optical Observation
  9. GRB 070220: ART-3 Optical and NIR limits
  10. GRB 070220: Observation with the KANATA 1.5m telescope
  11. GRB070219: MASTER-VWF-Kislovodsk observations
  12. GRB 070219, Swift-BAT refined analysis
  13. GRB 070219: ROTSE-III Optical Limits
  14. GRB070219 - SDSS Pre-Burst Observations
  15. GRB 070201: clarification on localization and Konus-Wind spectra
  16. IPN localization of very bright long hard GRB 070207
  17. IPN localization of very intense short GRB 070201
  18. GRB 070208: ROTSE-III Optical Limits
  19. GRB 070125: further AAVSO optical observations
  20. GRB 070129, Swift-BAT refined analysis of a particularly long
  21. Konus-Wind observation of GRB 070125
  22. GRB070125: Swift-XRT Refined Analysis
  23. GRB 070125: SARA detection in R
  24. RHESSI Spectrum of GRB070125
  25. Konus-Wind observation of short hard GRB 070124
  26. IPN localization of GRB070124 (short duration, hard spectrum)
  27. GRB 070110: Continued Detection and Request for Ground Followup
  28. GRB 070110: Ep,i - Eiso correlation
  29. GRB 070110 declared a "Burst of Interest" by Swift team
  30. Further Retractions of previous Swift-BAT triggers
  31. Trigger 255685: Swift detection of a possible burst
  32. GRB 070103: Swift detection of a burst
  33. Retractions of previous Swift-BAT triggers
  34. Konus-Wind observation of GRB 061222A
  35. GRB 061210: Swift/XRT Astrometry Correction
  36. GRB061222B: Swift-XRT Refined Analysis
  37. GRB 061222B: SARA upper limit
  38. GRB 061222A: Prompt ROTSE-III Optical Limits
  39. GRB 061217: Astrometry-Corrected XRT Position
  40. GRB 061217, SMARTS optical observations
  41. GRB 061217: ROTSE-III Optical Limits
  42. GRB 061214(?): ROTSE-III Optical Limits
  43. GRB 061210: Suzaku WAM observation of the prompt emission
  44. GRB 061210: Swift-BAT detection of a short burst
  45. Konus-Wind observation of GRB 061201
  46. GRB 061202, Swift-BAT refined analysis
  47. GRB 061122: GETS observation
  48. GRB 061121: Second Epoch ATCA Radio Observations
  49. GRB 061126: optical observation
  50. GRB 061126: Tautenburg afterglow observations
  51. GRB 061121: MDM Continued Monitoring
  52. GRB 061121: MDM Optical Decay
  53. GRB 061121: ART detection in Ic
  54. Konus-Wind observation of GRB 061122
  55. Konus-Wind and Konus-A observations of GRB 061121
  56. INTEGRAL results on GRB 061122
  57. GRB 061122A: a long GRB detected by INTEGRAL
  58. GRB 061121, Swift-BAT refined analysis
  59. GRB 061121: Faulkes Telescope North Optical Observation
  60. GRB 060111B: Swift UVOT Refined Magnitudes
  61. GRB061110B: Optical observations at Crni Vrh
  62. GRB 061110B: NOT optical observations
  63. GRB 061110: ROTSE-III Optical Limits
  64. GRB061019: second epoch CrAO observations
  65. GRB061102B: Super-LOTIS observations
  66. GRB 061028: Optical R passband observations
  67. GRB 061028: z band imaging
  68. GRB 061027, Swift refined analysis of a possible burst
  69. GRB061025: Swift XRT refined analysis
  70. GRB 061025: Gemini-S observations
  71. GRB061025: Swift XRT position
  72. GRB 061025: ROTSE-III Optical Limits
  73. GRB 061025: a long GRB detected by INTEGRAL
  74. Konus-Wind observation of GRB 061021
  75. GRB 061021: Swift-XRT refined analysis
  76. GRB 061021: Swift detection of a burst
  77. GRB061019: optical observations
  78. GRB 061019: SARA upper limit
  79. GRB 060930: MARGE Optical Limits
  80. GRB 061019, Swift-BAT refined analysis
  81. GRB 061019: Swift-BAT detection of a burst
  82. GRB 061007: RHESSI Spectral Fit
  83. Konus-Wind observation of GRB 061007
  84. Konus-Wind observation of the short hard GRB 061006
  85. Konus-Wind observation of GRB 060928
  86. GRB 060928: RHESSI Spectral Fit
  87. GRB 060930: near-IR afterglow candidate
  88. GRB 061002, Swift-BAT refined analysis
  89. GRB061002: MASTER-VWF-Kislovodsk observations
  90. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  91. GRB 061002: Swift detection of a burst
  92. GRB 060807: Detection of a possible host galaxy
  93. GRB060930: Faulkes Telescope South observation
  94. GRB 060930: ROTSE-III Optical Limits
  95. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  96. GRB 060929: BART observation
  97. GRB 060929: MASTER-VWF-Kislovodsk observations
  98. GRB 060929: BOOTES-IR & OSN observations
  99. Liverpool Telescope observations of GRB 060929
  100. GRB060908: optical observations

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