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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"

21970 results found.

  1. GRB070224: Gemini Imaging Observations
  2. GRB 070224: SARA upper limit
  3. GRB 070224: optical afterglow candidate
  4. GRB 070224: MASTER-VWF-Kislovodsk observations
  5. GRB 070224: MASTER observations
  6. GRB 070223: Optical observations
  7. GRB070223: Swift/UVOT refined analysis
  8. GRB070223: MASTER-VWF-Kislovodsk observations
  9. GRB070223 - SDSS Pre-Burst Observations
  10. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  11. GRB 070223: MDM Observations
  12. Konus-Wind and Konus-A observations of GRB 070220
  13. Swift/UVOT refined analysis of GRB070220
  14. GRB 070219: Gemini Observations
  15. GRB 070220 : Faulkes Telescope North optical limit
  16. GRB070219: MASTER-VWF-Kislovodsk observations
  17. GRB 070219: Swift/UVOT Upper limits
  18. GRB 070219: I-band observations
  19. GRB 070219: optical TNG observations
  20. GRB 070219: Liverpool Telescope Observations
  21. GRB070219 - SDSS Pre-Burst Observations
  22. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  23. GRB 070125 observations with the GMRT
  24. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  25. GRB 060927: PROMPT Observations
  26. GRB 070125: Break in Optical Decay
  27. GRB 070201: clarification on localization and Konus-Wind spectra
  28. GRB070208: optical observations
  29. GRB 070201: IPN constraints and nearby galaxies
  30. GRB 070201: Proximity of IPN annulus to M31
  31. GRB 070208: MARGE Optical Observations
  32. GRB070208: Absorption and emission redshift from Gemini
  33. GRB 070208: MDM Optical Decay
  34. GRB070208 - SDSS Pre-Burst Observations
  35. GRB 070208: Early IR detection and afterglow astrometry
  36. GRB 070208: Afterglow confirmation from P60
  37. GRB070208: Faulkes Telescope North Afterglow Identification
  38. GRB 070208: MDM Observations
  39. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  40. GRB 070129: afterglow confirmation
  41. GRB 070125: further AAVSO optical observations
  42. GRB 070129: Swift/UVOT Upper limits
  43. GRB 070125: optical observation
  44. GRB 070125: WSRT Radio Detection
  45. Radio detection of GRB 070125
  46. GRB 070129: VLT observations
  47. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  48. GRB 070126: Swift/UVOT refined analysis
  49. GRB 070125: further AAVSO optical observations
  50. GRB 070125: AAVSO optical observations
  51. GRB 070125: optical observations
  52. GRB 070126: VLT observations
  53. GRB070126: Swift-XRT possible detection of an afterglow
  54. GRB 070125: PROMPT detections
  55. GRB 070125: WSRT Radio Observations
  56. GRB070124: Swift-XRT Observation
  57. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  58. GRB 070125: Xinglong TNT optical observations
  59. GRB 070125: Continued P60 Observations
  60. GRB 070125: SARA detection in R
  61. GRB 070110: optical break
  62. Swift-BAT trigger 257213 is a Galactic Center transient
  63. GRB 070110: Continued Detection and Request for Ground Followup
  64. GRB 050904: Second Epoch of HST/NICMOS Observations
  65. GRB 070110 declared a "Burst of Interest" by Swift team
  66. GRB 070110: VLT absorption redshift
  67. GRB 070110: UVOT Observations of a Candidate Afterglow
  68. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  69. GRB070103: APO SPIcam i' and z' limits
  70. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  71. GRB070103: KPNO 4m+FLAMINGOS J limit
  72. GRB 070103: Swift/UVOT Upper limits
  73. GRB 070103: NOT observations
  74. GRB 070103: TAROT Calern observatory optical observations
  75. GRB061222a: optical observations
  76. erratum : SDSS Pre-burst Observations of GRB061126
  77. GRB 061210: Swift/XRT Astrometry Correction
  78. GRB 050826: MDM Redshift
  79. GRB 061222B: TAROT La Silla observatory early optical observations
  80. GRB 061218: TAROT La Silla observatory early optical observations
  81. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  82. GRB 061222A: Gemini Afterglow Candidate
  83. GRB061222B: Swift-XRT Refined Analysis
  84. GRB 061222B: BOOTES-IR optical observations
  85. GRB 061222A: Swift-XRT refined analysis
  86. GRB 061217: Magellan host galaxy redshift
  87. GRB 061222B: REM NIR/optical observations
  88. GRB 061222b, SMARTS optical/IR afterglow observations
  89. GRB 061222B: TAROT La Silla observatory optical observations
  90. GRB 061222b: Magellan redshift
  91. GRB 061222b: optical afterglow
  92. GRB 061217: Astrometry-Corrected XRT Position
  93. GRB 061201: Magellan redshift of nearby galaxy
  94. GRB 061217: Confirmation of host candidate
  95. GRB 061217: Object ib GCN 5948 is a star
  96. GRB 061217: Extended object in the revised XRT error circle
  97. GRB 061217, Candidate host galaxy
  98. GRB 061217 - Swift/XRT position correction
  99. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  100. GRB 061201: Magellan Redshift of nearby Abell cluster

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