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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"

21983 results found.

  1. GRB 070223: NIR observations at WHT
  2. GRB070227: Swift-XRT refined analysis
  3. GRB 070125, deep late-time optical observation
  4. GRB 070227: optical observations
  5. GRB 070223: Optical Observations
  6. GRB 070227: optical observations
  7. GRB 070227: Swift/UVOT Upper Limits
  8. GRB 070227: TAROT La Silla observatory optical observations
  9. GRB070227: possible X-ray afterglow detection
  10. GRB 920925C: optical afterglow candidate
  11. GRB 070224: Swift/UVOT Upper Limits
  12. GRB070224: Magellan Imaging Observations
  13. GRB 070224: MDM Observations
  14. GRB070224: Gemini Imaging Observations
  15. GRB 070224: SARA upper limit
  16. GRB 070224: optical afterglow candidate
  17. GRB 070224: MASTER-VWF-Kislovodsk observations
  18. GRB 070224: MASTER observations
  19. GRB 070223: Optical observations
  20. GRB070223: Swift/UVOT refined analysis
  21. GRB070223: MASTER-VWF-Kislovodsk observations
  22. GRB070223 - SDSS Pre-Burst Observations
  23. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  24. GRB 070223: MDM Observations
  25. Konus-Wind and Konus-A observations of GRB 070220
  26. Swift/UVOT refined analysis of GRB070220
  27. GRB 070219: Gemini Observations
  28. GRB 070220 : Faulkes Telescope North optical limit
  29. GRB070219: MASTER-VWF-Kislovodsk observations
  30. GRB 070219: Swift/UVOT Upper limits
  31. GRB 070219: I-band observations
  32. GRB 070219: optical TNG observations
  33. GRB 070219: Liverpool Telescope Observations
  34. GRB070219 - SDSS Pre-Burst Observations
  35. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  36. GRB 070125 observations with the GMRT
  37. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  38. GRB 060927: PROMPT Observations
  39. GRB 070125: Break in Optical Decay
  40. GRB 070201: clarification on localization and Konus-Wind spectra
  41. GRB070208: optical observations
  42. GRB 070201: IPN constraints and nearby galaxies
  43. GRB 070201: Proximity of IPN annulus to M31
  44. GRB 070208: MARGE Optical Observations
  45. GRB070208: Absorption and emission redshift from Gemini
  46. GRB 070208: MDM Optical Decay
  47. GRB070208 - SDSS Pre-Burst Observations
  48. GRB 070208: Early IR detection and afterglow astrometry
  49. GRB 070208: Afterglow confirmation from P60
  50. GRB070208: Faulkes Telescope North Afterglow Identification
  51. GRB 070208: MDM Observations
  52. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  53. GRB 070129: afterglow confirmation
  54. GRB 070125: further AAVSO optical observations
  55. GRB 070129: Swift/UVOT Upper limits
  56. GRB 070125: optical observation
  57. GRB 070125: WSRT Radio Detection
  58. Radio detection of GRB 070125
  59. GRB 070129: VLT observations
  60. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  61. GRB 070126: Swift/UVOT refined analysis
  62. GRB 070125: further AAVSO optical observations
  63. GRB 070125: AAVSO optical observations
  64. GRB 070125: optical observations
  65. GRB 070126: VLT observations
  66. GRB070126: Swift-XRT possible detection of an afterglow
  67. GRB 070125: PROMPT detections
  68. GRB 070125: WSRT Radio Observations
  69. GRB070124: Swift-XRT Observation
  70. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  71. GRB 070125: Xinglong TNT optical observations
  72. GRB 070125: Continued P60 Observations
  73. GRB 070125: SARA detection in R
  74. GRB 070110: optical break
  75. Swift-BAT trigger 257213 is a Galactic Center transient
  76. GRB 070110: Continued Detection and Request for Ground Followup
  77. GRB 050904: Second Epoch of HST/NICMOS Observations
  78. GRB 070110 declared a "Burst of Interest" by Swift team
  79. GRB 070110: VLT absorption redshift
  80. GRB 070110: UVOT Observations of a Candidate Afterglow
  81. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  82. GRB070103: APO SPIcam i' and z' limits
  83. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  84. GRB070103: KPNO 4m+FLAMINGOS J limit
  85. GRB 070103: Swift/UVOT Upper limits
  86. GRB 070103: NOT observations
  87. GRB 070103: TAROT Calern observatory optical observations
  88. GRB061222a: optical observations
  89. erratum : SDSS Pre-burst Observations of GRB061126
  90. GRB 061210: Swift/XRT Astrometry Correction
  91. GRB 050826: MDM Redshift
  92. GRB 061222B: TAROT La Silla observatory early optical observations
  93. GRB 061218: TAROT La Silla observatory early optical observations
  94. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  95. GRB 061222A: Gemini Afterglow Candidate
  96. GRB061222B: Swift-XRT Refined Analysis
  97. GRB 061222B: BOOTES-IR optical observations
  98. GRB 061222A: Swift-XRT refined analysis
  99. GRB 061217: Magellan host galaxy redshift
  100. GRB 061222B: REM NIR/optical observations

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