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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"

24381 results found.

  1. GRB 070224, Swift-BAT refined analysis
  2. GRB 070224: MASTER-Net refind analysis
  3. GRB 070224: MASTER-VWF-Kislovodsk observations
  4. GRB 070224: MASTER observations
  5. GRB 070223: Optical observations
  6. RHESSI Spectrum of GRB070220
  7. GRB 070223: Optical-IR observation with KANATA
  8. GRB 070223, Swift-BAT refined analysis
  9. GRB070223: MASTER-VWF-Kislovodsk observations
  10. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  11. GRB070223: Swift burst
  12. Konus-Wind and Konus-A observations of GRB 070220
  13. GRB 070220: MITSuME Okayama Optical Observation
  14. GRB 070220 Swift-BAT Refined Analysis
  15. GRB 070220: Swift-XRT Refined Analysis
  16. GRB 070220: Observation with the KANATA 1.5m telescope
  17. GRB 070220 : Faulkes Telescope North optical limit
  18. GRB070219: MASTER-VWF-Kislovodsk observations
  19. GRB 070219: XRT Refined Analysis
  20. GRB 070219, Swift-BAT refined analysis
  21. GRB 070219: Liverpool Telescope Observations
  22. GRB 070219: ROTSE-III Optical Limits
  23. GRB 060927: PROMPT Observations
  24. GRB 070125: Break in Optical Decay
  25. GRB 070209: Swift XRT analysis
  26. GRB 070201: clarification on localization and Konus-Wind spectra
  27. GRB 070201: Proximity of IPN annulus to M31
  28. GRB 070208: MARGE Optical Observations
  29. IPN localization of very bright long hard GRB 070207
  30. IPN localization of very intense short GRB 070201
  31. GRB 070209, Swift-BAT refined analysis of the short hard burst
  32. GRB 070208: RAPTOR detection of early afterglow onset
  33. GRB 070208: MDM Optical Decay
  34. GRB 070208, Swift-BAT refined analysis
  35. GRB 070208: Afterglow confirmation from P60
  36. GRB070208: Faulkes Telescope North Afterglow Identification
  37. GRB 070208: ROTSE-III Optical Limits
  38. GRB 070208: MDM Observations
  39. GRB 070125 detection with CARMA
  40. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  41. GRB 070129: afterglow confirmation
  42. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  43. GRB 070125: optical observation
  44. GRB070129: MITSuME optical observation
  45. GRB061217: MAGIC telescope GeV observation
  46. GRB 070129, Swift-BAT refined analysis of a particularly long
  47. GRB 070125: MITSuME Okayama optical observation
  48. Konus-Wind observation of GRB 070125
  49. GRB070126: Swift-XRT possible detection of an afterglow
  50. GRB 070125: PROMPT detections
  51. GRB 070124: Suzaku WAM observation of the prompt emissions
  52. GRB 070126, Swift-BAT refined analysis of a very faint burst
  53. GRB070125: Optical observation by Kanata
  54. GRB 070126?: Swift detection of a possible burst
  55. RHESSI Spectrum of GRB070125
  56. IPN-BAT localization of GRB070125 (very long duration, intense)
  57. Konus-Wind observation of short hard GRB 070124
  58. IPN localization of GRB070124 (short duration, hard spectrum)
  59. GRB 070110: optical break
  60. GRB 070110: Continued Detection and Request for Ground Followup
  61. GRB 070107: Suzaku WAM observation of the prompt emission
  62. Further Retractions of previous Swift-BAT triggers
  63. Trigger 255685: Swift detection of a possible burst
  64. GRB 070110, Swift-BAT refined analysis
  65. IBAS Alert n. 4047: Not a GRB
  66. GRB 070107, Swift-BAT refined analysis
  67. GRB 070107: Swift detection of a burst
  68. GRB070103: Swift XRT refined analysis
  69. GRB 070103, Swift-BAT refined analysis
  70. Retractions of previous Swift-BAT triggers
  71. erratum : SDSS Pre-burst Observations of GRB061126
  72. GRB 061210: Swift/XRT Astrometry Correction
  73. GRB 061222B: TAROT La Silla observatory early optical observations
  74. GRB 061218: TAROT La Silla observatory early optical observations
  75. GRB 061222A: MITSuME Akeno optical upper limits
  76. GRB 061222B: MITSuME Akeno optical upper limits
  77. GRB 061222B, Swift-BAT refined analysis
  78. GRB 061222B: Observation with the KANATA 1.5m telescope
  79. GRB061222B: Swift-XRT Refined Analysis
  80. GRB 061222A: Observation with the KANATA 1.5m telescope
  81. GRB 061222B: BOOTES-IR optical observations
  82. GRB 061222A, Swift-BAT refined analysis
  83. GRB 061222b, SMARTS optical/IR afterglow observations
  84. GRB 061222A: Prompt ROTSE-III Optical Limits
  85. GRB 061218: TORTOREM optical upper limits
  86. GRB 061218, Swift-BAT refined analysis
  87. GRB 061218, SMARTS optical/IR observations
  88. GRB 061218: REM prompt observations
  89. GRB 061217, SMARTS optical observations
  90. GRB061217 - Swift/XRT refined analysis
  91. GRB 061217, Swift-BAT refined analysis
  92. GRB 061217: REM prompt observations
  93. GRB 061217: ROTSE-III Optical Limits
  94. GRB 061217: Swift detection of a short hard burst
  95. GRB061210: Swift/UVOT observations
  96. GRB 061210 : Faulkes North Telescope optical limit
  97. GRB 061214(?): ROTSE-III Optical Limits
  98. GRB 061210: Suzaku WAM observation of the prompt emission
  99. Swift/BAT trigger #250033 is due to a known source during loss of
  100. GRB 061213: MASTER-VWF-Kislovodsk optical candidate

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