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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20469 results found.

  1. GRB 070224: optical afterglow candidate
  2. GRB 070224: MASTER-Net refind analysis
  3. GRB 070224: MASTER-VWF-Kislovodsk observations
  4. GRB 070224: Swift detection of a burst
  5. GRB 070223: Optical observations
  6. RHESSI Spectrum of GRB070220
  7. GRB070223: Swift/UVOT refined analysis
  8. GRB 070223: Optical-IR observation with KANATA
  9. GRB070223: MASTER-VWF-Kislovodsk observations
  10. GRB070223 - SDSS Pre-Burst Observations
  11. GRB070223: Swift burst
  12. Konus-Wind and Konus-A observations of GRB 070220
  13. GRB 070220: MITSuME Okayama Optical Observation
  14. GRB 070220 Swift-BAT Refined Analysis
  15. Swift/UVOT refined analysis of GRB070220
  16. GRB 070209: Swift XRT refined analysis
  17. GRB 070220: Observation with the KANATA 1.5m telescope
  18. GRB 070219: Gemini Observations
  19. GRB 070220: Swift detection of a burst
  20. GRB070219: MASTER-VWF-Kislovodsk observations
  21. GRB 070219: Swift/UVOT Upper limits
  22. GRB 070219: I-band observations
  23. GRB 070219: optical TNG observations
  24. GRB 070219: ROTSE-III Optical Limits
  25. GRB070219 - SDSS Pre-Burst Observations
  26. GRB 070219: Swift detection of a burst
  27. GRB 070125 observations with the GMRT
  28. GRB 070129: MDM I-band Detection
  29. GRB 070209: Swift XRT analysis
  30. GRB 070201: clarification on localization and Konus-Wind spectra
  31. IPN localization of very intense short GRB 070201
  32. GRB 070208: RAPTOR detection of early afterglow onset
  33. GRB 070208, Swift-BAT refined analysis
  34. GRB070208 - SDSS Pre-Burst Observations
  35. GRB 070208: Afterglow confirmation from P60
  36. GRB 070208: ROTSE-III Optical Limits
  37. GRB 070208: Swift detection of a burst
  38. GRB 070125 detection with CARMA
  39. GRB 070129: afterglow confirmation
  40. GRB070124: Swift-XRT Follow-up Observation
  41. GRB070126: Swift-XRT Observation
  42. GRB 070125: further AAVSO optical observations
  43. GRB 070129: Swift/UVOT Upper limits
  44. GRB 070129: Xinglong TNT optical Upper Limit
  45. GRB 070129: Swift-XRT Refined Analysis
  46. GRB 070129: VLT observations
  47. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  48. GRB 070129: Swift detection of a burst
  49. GRB 070126: Swift/UVOT refined analysis
  50. Konus-Wind observation of GRB 070125
  51. GRB 070125: optical observations
  52. GRB 070126: VLT observations
  53. GRB 070124: Suzaku WAM observation of the prompt emissions
  54. GRB 070126, Swift-BAT refined analysis of a very faint burst
  55. GRB070125: Optical observation by Kanata
  56. GRB070124: Swift-XRT Observation
  57. Possible GRB 070126: Swift/UVOT Upper Limit
  58. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  59. GRB 070125: Xinglong TNT optical observations
  60. GRB070125: Swift-XRT Refined Analysis
  61. GRB 070125: SARA detection in R
  62. GRB 070125: P60 Optical Afterglow Candidate
  63. GRB 070126?: Swift detection of a possible burst
  64. GRB070125 redshift request
  65. RHESSI Spectrum of GRB070125
  66. Konus-Wind observation of short hard GRB 070124
  67. IPN localization of GRB070124 (short duration, hard spectrum)
  68. GRB 070110: optical break
  69. GRB 070107: Suzaku WAM observation of the prompt emission
  70. GRB 070110, Swift-BAT refined analysis
  71. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  72. GRB 070110: Swift detection of a burst with a possible optical afterglow
  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. GRB070103: KPNO 4m+FLAMINGOS J limit
  78. GRB 070103: Swift/UVOT Upper limits
  79. GRB 070103: NOT observations
  80. GRB 070103: TAROT Calern observatory optical observations
  81. erratum : SDSS Pre-burst Observations of GRB061126
  82. Konus-Wind observation of GRB 061222A
  83. GRB 061210: Swift/XRT Astrometry Correction
  84. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  85. GRB 061222A: Xinglong Optical Limit
  86. GRB 061222A: Gemini Afterglow Candidate
  87. GRB 061222B, Swift-BAT refined analysis
  88. GRB061222A Swift/UVOT: Upper Limits
  89. GRB 061222B: Swift/UVOT Upper limits
  90. GRB 061222B: Observation with the KANATA 1.5m telescope
  91. GRB 061222A: Observation with the KANATA 1.5m telescope
  92. GRB 061222B: BOOTES-IR optical observations
  93. GRB 061222B: SARA upper limit
  94. GRB 061222B: REM NIR/optical observations
  95. GRB 061222B: TAROT La Silla observatory optical observations
  96. GRB 061222B: Swift detection of a burst
  97. GRB 061222A: Prompt ROTSE-III Optical Limits
  98. GRB 061222: Swift detection of a burst
  99. GRB 061218: TAROT La Silla observatory optical observations
  100. GRB 061217: TAROT Calern observatory optical observations

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