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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"

20521 results found.

  1. GRB070223: Swift/UVOT refined analysis
  2. GRB 070223: Optical-IR observation with KANATA
  3. GRB070223: MASTER-VWF-Kislovodsk observations
  4. GRB070223 - SDSS Pre-Burst Observations
  5. GRB070223: Swift burst
  6. GRB 070220: MITSuME Okayama Optical Observation
  7. Swift/UVOT refined analysis of GRB070220
  8. GRB 070209: Swift XRT refined analysis
  9. GRB 070220: Observation with the KANATA 1.5m telescope
  10. GRB 070219: Gemini Observations
  11. GRB 070220: Swift detection of a burst
  12. GRB070219: MASTER-VWF-Kislovodsk observations
  13. GRB 070219: XRT Refined Analysis
  14. GRB 070219: Swift/UVOT Upper limits
  15. GRB 070219: I-band observations
  16. GRB 070219, Swift-BAT refined analysis
  17. GRB 070219: optical TNG observations
  18. GRB070219 - SDSS Pre-Burst Observations
  19. GRB 070125 observations with the GMRT
  20. GRB 070129: MDM I-band Detection
  21. GRB 070125: Break in Optical Decay
  22. GRB 070209: Swift XRT analysis
  23. GRB 070201: clarification on localization and Konus-Wind spectra
  24. IPN localization of very bright long hard GRB 070207
  25. GRB 070208: MDM Optical Decay
  26. GRB070208 - SDSS Pre-Burst Observations
  27. GRB 070208: Swift detection of a burst
  28. GRB 070125 detection with CARMA
  29. GRB 070129: afterglow confirmation
  30. GRB070126: Swift-XRT Observation
  31. GRB 070125: further AAVSO optical observations
  32. GRB 070129: Swift/UVOT Upper limits
  33. GRB 070129: Xinglong TNT optical Upper Limit
  34. GRB 070129: Swift-XRT Refined Analysis
  35. GRB 070129: VLT observations
  36. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  37. GRB 070129: Swift detection of a burst
  38. GRB 070126: Swift/UVOT refined analysis
  39. Konus-Wind observation of GRB 070125
  40. GRB 070125: optical observations
  41. GRB 070126: VLT observations
  42. GRB070126: Swift-XRT possible detection of an afterglow
  43. GRB070125: Optical observation by Kanata
  44. GRB070124: Swift-XRT Observation
  45. Possible GRB 070126: Swift/UVOT Upper Limit
  46. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  47. GRB 070125: Xinglong TNT optical observations
  48. GRB070125: Swift-XRT Refined Analysis
  49. GRB 070125: SARA detection in R
  50. GRB 070125: P60 Optical Afterglow Candidate
  51. GRB 070126?: Swift detection of a possible burst
  52. GRB070125 redshift request
  53. RHESSI Spectrum of GRB070125
  54. IPN-BAT localization of GRB070125 (very long duration, intense)
  55. GRB 070110: Continued Detection and Request for Ground Followup
  56. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  57. GRB 070110: Swift detection of a burst with a possible optical afterglow
  58. GRB 070107: Possible UVOT Afterglow
  59. GRB 070107: Swift detection of a burst
  60. VLA observation of GRB 061222B
  61. VLA detection of GRB 061222A
  62. GRB070103: APO SPIcam i' and z' limits
  63. GRB070103: KPNO 4m+FLAMINGOS J limit
  64. GRB 070103: Swift/UVOT Upper limits
  65. GRB 070103: NOT observations
  66. GRB 070103: TAROT Calern observatory optical observations
  67. erratum : SDSS Pre-burst Observations of GRB061126
  68. GRB 061210: Swift/XRT Astrometry Correction
  69. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  70. GRB 061222A: Xinglong Optical Limit
  71. GRB 061222A: Gemini Afterglow Candidate
  72. GRB061222A Swift/UVOT: Upper Limits
  73. GRB 061222B: Swift/UVOT Upper limits
  74. GRB 061222B: Observation with the KANATA 1.5m telescope
  75. GRB 061222A: Observation with the KANATA 1.5m telescope
  76. GRB 061222B: BOOTES-IR optical observations
  77. GRB 061222B: SARA upper limit
  78. GRB 061222B: REM NIR/optical observations
  79. GRB 061222B: TAROT La Silla observatory optical observations
  80. GRB 061222B: Swift detection of a burst
  81. GRB 061222A: Prompt ROTSE-III Optical Limits
  82. GRB 061222: Swift detection of a burst
  83. GRB 061218: TAROT La Silla observatory optical observations
  84. GRB 061217: TAROT Calern observatory optical observations
  85. GRB 061218: TORTOREM optical upper limits
  86. GRB 061218, Swift-BAT refined analysis
  87. GRB061217: VLT NIR observations
  88. GRB 061218, SMARTS optical/IR observations
  89. GRB 061218: REM prompt observations
  90. Swift triggers (#251863) on a possible burst
  91. GRB061217: Swift/UVOT refined analysis.
  92. GRB 061217: optical observations at Calar Alto
  93. GRB061217 - Swift/XRT refined analysis
  94. GRB 061217: Magellan Observations
  95. GRB 061217: REM prompt observations
  96. GRB 061217: ROTSE-III Optical Limits
  97. GRB061210: Swift/UVOT observations
  98. GRB 061210: Swift XRT analysis - Possible counterparts
  99. GRB 061214(?): Swift detection of a possible burst
  100. GRB 061210: Gemini/GMOS Observations

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