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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"

25843 results found.

  1. GRB 070223: Swift-XRT Refined Analysis
  2. GRB070223 - SDSS Pre-Burst Observations
  3. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  4. GRB070223: Swift burst
  5. Konus-Wind and Konus-A observations of GRB 070220
  6. GRB 070220: MITSuME Okayama Optical Observation
  7. Swift/UVOT refined analysis of GRB070220
  8. GRB 070209: Swift XRT refined analysis
  9. GRB 070220: Swift-XRT Refined Analysis
  10. GRB 070220: Observation with the KANATA 1.5m telescope
  11. GRB 070219: Gemini Observations
  12. GRB 070220 : Faulkes Telescope North optical limit
  13. GRB 070220: Swift detection of a burst
  14. GRB070219: MASTER-VWF-Kislovodsk observations
  15. GRB 070219: XRT Refined Analysis
  16. GRB 070219: Swift/UVOT Upper limits
  17. GRB 070219: I-band observations
  18. GRB 070219: optical TNG observations
  19. GRB 070219: Liverpool Telescope Observations
  20. GRB070219 - SDSS Pre-Burst Observations
  21. GRB 070125 observations with the GMRT
  22. GRB 070129: MDM I-band Detection
  23. GRB 070125: Break in Optical Decay
  24. GRB 070209: Swift XRT analysis
  25. GRB 070201: clarification on localization and Konus-Wind spectra
  26. IPN localization of very bright long hard GRB 070207
  27. GRB 070208: Swift XRT refined analysis
  28. GRB 070208, Swift-BAT refined analysis
  29. GRB070208 - SDSS Pre-Burst Observations
  30. GRB070208: Faulkes Telescope North Afterglow Identification
  31. GRB 070208: Swift detection of a burst
  32. GRB 070125 detection with CARMA
  33. GRB 070129: afterglow confirmation
  34. GRB070126: Swift-XRT Observation
  35. GRB 070129: Swift/UVOT Upper limits
  36. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  37. GRB 070125: optical observation
  38. GRB061217: MAGIC telescope GeV observation
  39. GRB 070129: Xinglong TNT optical Upper Limit
  40. GRB 070129: Swift-XRT Refined Analysis
  41. GRB 070129: VLT observations
  42. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  43. GRB 070129: Swift detection of a burst
  44. GRB 070126: Swift/UVOT refined analysis
  45. GRB 070125: MITSuME Okayama optical observation
  46. GRB 070125: optical observations
  47. GRB 070126: VLT observations
  48. GRB 070124: Suzaku WAM observation of the prompt emissions
  49. GRB070125: Optical observation by Kanata
  50. GRB070124: Swift-XRT Observation
  51. Possible GRB 070126: Swift/UVOT Upper Limit
  52. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  53. GRB 070125: Xinglong TNT optical observations
  54. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  55. GRB 070125: Lick 3m Spectroscopy
  56. GRB070125: Swift-XRT Refined Analysis
  57. GRB 070125: SARA detection in R
  58. GRB 070125: P60 Optical Afterglow Candidate
  59. GRB 070126?: Swift detection of a possible burst
  60. GRB070125 redshift request
  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. GRB070110: Swift XRT Team refined analysis
  68. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  69. GRB 070110: Swift detection of a burst with a possible optical afterglow
  70. GRB070107: Swift/XRT refined analysis
  71. GRB 070107, Swift-BAT refined analysis
  72. GRB 070107: Swift detection of a burst
  73. VLA observation of GRB 061222B
  74. VLA detection of GRB 061222A
  75. GRB070103: APO SPIcam i' and z' limits
  76. GRB 070103: Swift/UVOT Upper limits
  77. GRB070103: Swift XRT refined analysis
  78. GRB 070103: NOT observations
  79. GRB 070103: TAROT Calern observatory optical observations
  80. erratum : SDSS Pre-burst Observations of GRB061126
  81. Konus-Wind observation of GRB 061222A
  82. GRB 061210: Swift/XRT Astrometry Correction
  83. GRB 050826: MDM Redshift
  84. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  85. GRB 061222A: Xinglong Optical Limit
  86. GRB 061222A: Gemini Afterglow Candidate
  87. GRB061222A Swift/UVOT: Upper Limits
  88. GRB 061222B: Swift/UVOT Upper limits
  89. GRB 061222B: Observation with the KANATA 1.5m telescope
  90. GRB061222B: Swift-XRT Refined Analysis
  91. GRB 061222A: Observation with the KANATA 1.5m telescope
  92. GRB 061222B: BOOTES-IR optical observations
  93. GRB 061222B: SARA upper limit
  94. GRB 061222A: Swift-XRT refined analysis
  95. GRB 061222B: REM NIR/optical observations
  96. GRB 061222B: TAROT La Silla observatory afterglow observation
  97. GRB 061222B: TAROT La Silla observatory optical observations
  98. GRB 061222B: Swift detection of a burst
  99. GRB 061222A: Prompt ROTSE-III Optical Limits
  100. GRB 061222: Swift detection of a burst

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