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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"

18364 results found.

  1. GRB 070306: IR observations and candidate afterglow
  2. GRB 070306: XRT Team Refined Analysis
  3. GRB 070306: Optical and IR observations with KANATA
  4. GRB070306 - SDSS Pre-burst Observations
  5. GRB 070306: Swift detection of a burst
  6. GRB 060605 new redshift
  7. GRB 070125, deep late-time optical observation
  8. VLA observation of GRB 070224
  9. GRB 070227: Swift/UVOT Upper Limits
  10. GRB 070227: TAROT La Silla observatory optical observations
  11. GRB 070227: Swift detection of a burst in ground analysis
  12. GRB 070224: Swift/UVOT Upper Limits
  13. VLA observation of GRB 070223
  14. VLA observation of GRB 070220
  15. GRB070224: Magellan Imaging Observations
  16. GRB 070224: WHT K-band imaging
  17. GRB 070224: MDM Observations
  18. GRB070224: Gemini Imaging Observations
  19. GRB 070224: SARA upper limit
  20. GRB 070224: optical afterglow candidate
  21. GRB 070224: MASTER-Net refind analysis
  22. GRB 070224: MASTER-VWF-Kislovodsk observations
  23. GRB 070224: Swift detection of a burst
  24. GRB 070223: Optical observations
  25. GRB070223: Swift/UVOT refined analysis
  26. GRB 070223: Optical-IR observation with KANATA
  27. GRB070223: MASTER-VWF-Kislovodsk observations
  28. GRB070223 - SDSS Pre-Burst Observations
  29. GRB070223: Swift burst
  30. GRB 070220: MITSuME Okayama Optical Observation
  31. Swift/UVOT refined analysis of GRB070220
  32. GRB 070209: Swift XRT refined analysis
  33. GRB 070220: Swift-XRT Refined Analysis
  34. GRB 070220: Observation with the KANATA 1.5m telescope
  35. GRB 070219: Gemini Observations
  36. GRB 070220: Swift detection of a burst
  37. GRB070219: MASTER-VWF-Kislovodsk observations
  38. GRB 070219: Swift/UVOT Upper limits
  39. GRB 070219: I-band observations
  40. GRB 070219: optical TNG observations
  41. GRB070219 - SDSS Pre-Burst Observations
  42. GRB 070125 observations with the GMRT
  43. GRB 070129: MDM I-band Detection
  44. GRB070208 - SDSS Pre-Burst Observations
  45. GRB 070208: Swift detection of a burst
  46. GRB 070125 detection with CARMA
  47. GRB 070129: afterglow confirmation
  48. GRB070126: Swift-XRT Observation
  49. GRB 070129: Swift/UVOT Upper limits
  50. GRB070129: MITSuME optical observation
  51. GRB 070129: Xinglong TNT optical Upper Limit
  52. GRB 070129: Swift-XRT Refined Analysis
  53. GRB 070129: VLT observations
  54. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  55. GRB 070129: Swift detection of a burst
  56. GRB 070126: Swift/UVOT refined analysis
  57. GRB 070125: optical observations
  58. GRB 070126: VLT observations
  59. GRB070125: Optical observation by Kanata
  60. GRB070124: Swift-XRT Observation
  61. Possible GRB 070126: Swift/UVOT Upper Limit
  62. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  63. GRB 070125: Xinglong TNT optical observations
  64. GRB 070125: Continued P60 Observations
  65. GRB070125: Swift-XRT Refined Analysis
  66. GRB 070125: SARA detection in R
  67. GRB 070125: P60 Optical Afterglow Candidate
  68. GRB 070126?: Swift detection of a possible burst
  69. GRB070125 redshift request
  70. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  71. GRB 070110: Swift detection of a burst with a possible optical afterglow
  72. GRB070107: Swift/XRT refined analysis
  73. GRB 070107: Swift detection of a burst
  74. VLA observation of GRB 061222B
  75. VLA detection of GRB 061222A
  76. GRB070103: APO SPIcam i' and z' limits
  77. GRB 070103: Swift/UVOT Upper limits
  78. GRB 070103: NOT observations
  79. GRB 070103: TAROT Calern observatory optical observations
  80. erratum : SDSS Pre-burst Observations of GRB061126
  81. GRB 061210: Swift/XRT Astrometry Correction
  82. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  83. GRB 061222A: Xinglong Optical Limit
  84. GRB 061222A: Gemini Afterglow Candidate
  85. GRB061222A Swift/UVOT: Upper Limits
  86. GRB 061222B: Swift/UVOT Upper limits
  87. GRB 061222B: Observation with the KANATA 1.5m telescope
  88. GRB 061222A: Observation with the KANATA 1.5m telescope
  89. GRB 061222B: BOOTES-IR optical observations
  90. GRB 061222B: SARA upper limit
  91. GRB 061222B: REM NIR/optical observations
  92. GRB 061222B: TAROT La Silla observatory optical observations
  93. GRB 061222B: Swift detection of a burst
  94. GRB 061222A: Prompt ROTSE-III Optical Limits
  95. GRB 061222: Swift detection of a burst
  96. GRB 061218: TAROT La Silla observatory optical observations
  97. GRB 061217: TAROT Calern observatory optical observations
  98. GRB 061218: TORTOREM optical upper limits
  99. GRB 061218, Swift-BAT refined analysis
  100. GRB061217: VLT NIR observations

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