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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

15275 results found.

  1. UVOT observations of GRB070330
  2. GRB 070330: Swift-XRT refined analysis
  3. Konus-Wind observation of GRB 070328
  4. GRB070223: confirmation of nIR and optical afterglow
  5. GRB 070318: Gemini + Magellan spectra
  6. GRB070318: Swift UVOT continuing observations
  7. GRB 070311: Late Central Engine Activity Optical Flare??
  8. GRB 070311: MDM Optical Monitoring
  9. GRB 070311: Optical Brightening
  10. GRB 070309: variability of the XRT afterglow candidate
  11. GRB 070311: RAPTOR Detection of Optical Emission
  12. GRB 070311: MITSuME Okayama Optical Observation
  13. GRB060901: Candidate optical afterglow
  14. GRB 070125: X-ray light curve analysis
  15. GRB 070306: NOT observations
  16. GRB 070306: Optical and IR observations with KANATA
  17. GRB070306 - SDSS Pre-burst Observations
  18. GRB 070306: Swift detection of a burst
  19. GRB 070223: NIR observations at WHT
  20. GRB070227: Swift-XRT refined analysis
  21. GRB 070125, deep late-time optical observation
  22. GRB 070223: Optical Observations
  23. GRB 070227, Swift-BAT refined analysis
  24. GRB 070224: WHT K-band imaging
  25. GRB 070224: MDM Observations
  26. GRB070224: Swift-XRT Refined Analysis
  27. GRB 070223: Optical-IR observation with KANATA
  28. GRB 070223: Swift-XRT Refined Analysis
  29. GRB070223 - SDSS Pre-Burst Observations
  30. Konus-Wind and Konus-A observations of GRB 070220
  31. GRB 070220: MITSuME Okayama Optical Observation
  32. GRB 070209: Swift XRT refined analysis
  33. GRB 070220: Observation with the KANATA 1.5m telescope
  34. GRB070219 - SDSS Pre-Burst Observations
  35. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  36. GRB 070125: Break in Optical Decay
  37. GRB 070201: clarification on localization and Konus-Wind spectra
  38. IPN localization of very bright long hard GRB 070207
  39. IPN localization of very intense short GRB 070201
  40. GRB 070208: Swift XRT refined analysis
  41. GRB070208 - SDSS Pre-Burst Observations
  42. GRB 070208: Early IR detection and afterglow astrometry
  43. GRB 070208: Afterglow confirmation from P60
  44. GRB 070129: afterglow confirmation
  45. GRB070126: Swift-XRT Observation
  46. GRB 070125: further AAVSO optical observations
  47. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  48. GRB 070129, Swift-BAT refined analysis of a particularly long
  49. GRB 070129: Xinglong TNT optical Upper Limit
  50. GRB 070129: Swift-XRT Refined Analysis
  51. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  52. GRB 070126: Swift/UVOT refined analysis
  53. GRB 070125: further AAVSO optical observations
  54. GRB 070125: MITSuME Okayama optical observation
  55. Konus-Wind observation of GRB 070125
  56. GRB 070125: AAVSO optical observations
  57. GRB070126: Swift-XRT possible detection of an afterglow
  58. GRB 070124: Suzaku WAM observation of the prompt emissions
  59. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  60. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  61. GRB070125: Swift-XRT Refined Analysis
  62. GRB070125 redshift request
  63. IPN-BAT localization of GRB070125 (very long duration, intense)
  64. Konus-Wind observation of short hard GRB 070124
  65. IPN localization of GRB070124 (short duration, hard spectrum)
  66. GRB 070110: optical break
  67. GRB 070110: Ep,i - Eiso correlation
  68. GRB 070107: Suzaku WAM observation of the prompt emission
  69. GRB 070110: VLT R-band photometry
  70. GRB 070110 declared a "Burst of Interest" by Swift team
  71. Further Retractions of previous Swift-BAT triggers
  72. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  73. GRB 070107: Swift/XRT position
  74. GRB070103: APO SPIcam i' and z' limits
  75. Konus-Wind observation of GRB 061222A
  76. GRB 061210: Swift/XRT Astrometry Correction
  77. GRB 050826: MDM Redshift
  78. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  79. GRB 061222B: Swift/UVOT Upper limits
  80. GRB 061222B: Observation with the KANATA 1.5m telescope
  81. GRB 061222B: BOOTES-IR optical observations
  82. GRB 061222A: Swift-XRT refined analysis
  83. GRB 061217: Magellan host galaxy redshift
  84. GRB 061222b, SMARTS optical/IR afterglow observations
  85. GRB 061222B: Swift detection of a burst
  86. GRB 061217: Confirmation of host candidate
  87. GRB 061217 - Swift/XRT position correction
  88. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  89. GRB 061217: TAROT Calern observatory optical observations
  90. GRB061217: VLT NIR observations
  91. GRB061217: Swift/UVOT refined analysis.
  92. GRB 061210: MDM Follow-up Observation
  93. GRB 061210: Optical sources near XRT positions
  94. GRB 061214(?): Swift detection of a possible burst
  95. GRB 061210: Suzaku WAM observation of the prompt emission
  96. Swift/BAT trigger #250033 is due to a known source during loss of
  97. GRB 061126: a GRB detected off-axis by INTEGRAL
  98. GRB 061202: Suzaku WAM observation of the prompt emission
  99. GRB 061210: MDM Observation
  100. GRB061126: optical observations

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