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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"

19340 results found.

  1. GRB 070125, deep late-time optical observation
  2. VLA observation of GRB 070224
  3. GRB 070227: optical observations
  4. GRB 070223: Optical Observations
  5. GRB 070227: optical observations
  6. GRB 070227: Swift/UVOT Upper Limits
  7. GRB 070227: TAROT La Silla observatory optical observations
  8. GRB 070227, Swift-BAT refined analysis
  9. GRB070227: possible X-ray afterglow detection
  10. GRB 070227: Swift detection of a burst in ground analysis
  11. GRB 070224: Optical afterglow confirmation
  12. GRB 070224: Swift/UVOT Upper Limits
  13. GRB070224: Swift-XRT Astrometrically Corrected Position
  14. VLA observation of GRB 070223
  15. VLA observation of GRB 070220
  16. GRB070224: Magellan Imaging Observations
  17. GRB070224: Gemini Imaging Observations
  18. GRB 070224: SARA upper limit
  19. GRB070224: Swift-XRT Refined Analysis
  20. GRB 070224, Swift-BAT refined analysis
  21. GRB 070224: MASTER-Net refind analysis
  22. GRB 070224: MASTER-VWF-Kislovodsk observations
  23. GRB 070224: Swift detection of a burst
  24. GRB070223: Swift/UVOT refined analysis
  25. GRB 070223, Swift-BAT refined analysis
  26. GRB070223: MASTER-VWF-Kislovodsk observations
  27. GRB 070223: Swift-XRT Refined Analysis
  28. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  29. GRB 070223: MDM Observations
  30. GRB070223: Swift burst
  31. Konus-Wind and Konus-A observations of GRB 070220
  32. GRB 070220 Swift-BAT Refined Analysis
  33. Swift/UVOT refined analysis of GRB070220
  34. GRB 070209: Swift XRT refined analysis
  35. GRB 070220: Swift-XRT Refined Analysis
  36. GRB 070220: Swift detection of a burst
  37. GRB070219: MASTER-VWF-Kislovodsk observations
  38. GRB 070219: XRT Refined Analysis
  39. GRB 070219: Swift/UVOT Upper limits
  40. GRB 070219, Swift-BAT refined analysis
  41. GRB 070219: ROTSE-III Optical Limits
  42. GRB070219 - SDSS Pre-Burst Observations
  43. GRB 070219: Swift detection of a burst
  44. Swift-BAT trigger 260304 is NOT a burst or transient
  45. GRB 070209: Swift XRT analysis
  46. GRB 070208: MARGE Optical Observations
  47. IPN localization of very bright long hard GRB 070207
  48. IPN localization of very intense short GRB 070201
  49. GRB 070209, Swift-BAT refined analysis of the short hard burst
  50. GRB 070209: Swift detection of a short hard burst
  51. GRB 070208: Swift XRT refined analysis
  52. GRB 070208: RAPTOR detection of early afterglow onset
  53. GRB 070208: MDM Optical Decay
  54. GRB 070208, Swift-BAT refined analysis
  55. GRB070208: Faulkes Telescope North Afterglow Identification
  56. GRB 070208: ROTSE-III Optical Limits
  57. GRB 070208: MDM Observations
  58. GRB 070208: Swift detection of a burst
  59. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  60. GRB070124: Swift-XRT Follow-up Observation
  61. GRB070126: Swift-XRT Observation
  62. GRB 070129: Swift/UVOT Upper limits
  63. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  64. GRB061217: MAGIC telescope GeV observation
  65. GRB 070129, Swift-BAT refined analysis of a particularly long
  66. GRB 070129: Swift-XRT Refined Analysis
  67. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  68. GRB 070129: Swift detection of a burst
  69. GRB 070126: Swift/UVOT refined analysis
  70. GRB070126: Swift-XRT possible detection of an afterglow
  71. GRB 070125: UVOT Detection in Ultraviolet Filters
  72. GRB 070126, Swift-BAT refined analysis of a very faint burst
  73. GRB070124: Swift-XRT Observation
  74. Possible GRB 070126: Swift/UVOT Upper Limit
  75. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  76. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
  77. GRB070125: Swift-XRT Refined Analysis
  78. GRB 070126?: Swift detection of a possible burst
  79. IPN-BAT localization of GRB070125 (very long duration, intense)
  80. IPN localization of GRB070124 (short duration, hard spectrum)
  81. Swift-BAT trigger 257213 is a Galactic Center transient
  82. GRB 070110: Continued Detection and Request for Ground Followup
  83. GRB 070110: Ep,i - Eiso correlation
  84. GRB 070110 declared a "Burst of Interest" by Swift team
  85. Further Retractions of previous Swift-BAT triggers
  86. Swift-BAT Trigger 255685 is not a GRB
  87. Trigger 255685: Swift detection of a possible burst
  88. GRB 070110: UVOT Observations of a Candidate Afterglow
  89. GRB070110: Swift XRT Team refined analysis
  90. GRB 070110, Swift-BAT refined analysis
  91. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  92. GRB 070110: Swift detection of a burst with a possible optical afterglow
  93. GRB070107: Swift/XRT refined analysis
  94. GRB 070107: Possible UVOT Afterglow
  95. GRB 070107, Swift-BAT refined analysis
  96. GRB 070107: Swift/XRT position
  97. GRB 070107: Swift detection of a burst
  98. GRB070103: APO SPIcam i' and z' limits
  99. GRB 070103: Swift/UVOT Upper limits
  100. GRB070103: Swift XRT refined analysis

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