Bridget Gannon was born 1860 or 1861, in Co.Kildare.
Her father was Christopher Gannon, Mother Bridget (maiden name unknown).

Her year of birth & location was obtained from a census return, but when a search of Parish indexes is done for Kildare the only Bridget that comes up, with a father called Christopher, is in 1858 (Leixlip RC). So this needs looking into.

She married James Gaynor on the 8th of May 1881, in Clondalkin, Co.Dublin.
Their children were:

Bridget Gaynor, born 1882 in Co.Dublin
Margaret Gaynor, born 1883 in Co.Dublin, Lower Palmerstown
Mary Jane Gaynor, born abt.1886 in Co.Dublin
Catherina Gaynor, born 1888 in Co.Dublin
Annie Gaynor, born abt.1897 in Co.Dublin
Christina Gaynor, born abt.1901 in Co.Dublin

Parish Record for marriage

 
   Date: 08/05/1881, Clondalkin 

Husband: James Gaynor                Wife: Bridget Gannon  
 Father: Patrick Gaynor            Father: Christopher Gannon 
 Mother: Margaret Gaynor           Mother: Bridget Gannon  
Witness: George McEnerney         Witness: Catherine Keane 
Address: Palmerstown  

Record obtained at Dublin City Library.


Index for parish record... http://www.dublinheritage.ie  

Husband Name   Wife Name        Date of Marriage   Parish
Gaynor James   Gannon Bridget   08-05-1881         Clondalkin 

Originally from Co.Meath. Wife was Bridget. Her maiden name is unknown, but I believe it to be Dowdal. The reasons being:

Their daughter Bridget gets married in Clondalkin and the parish record shows address as Palmerstown. There are more Gannons born Palmerstown with the same father's name and same first name as Briget's mother. See below.

IGI Records

 
LDS IGI online.
 
Parents: Christopher Gannon & Bridget Dowdal  (Dowdall)
 
     Mary Gannon birth: 31 May 1864, Palmerson, Dublin
Catherine Gannon birth: 14 Jan 1867, Dublin
     Mary Gannon birth: 29 Apr 1869, Palmerston Dublin
     Jane Gannon birth: 16 Jan 1872, Palmerston, Dublin
      Ann Gannon birth: 21 Apr 1875, Palmerstown
      

There are two marriages for Christopher Gannon on the Parish indexes, but only one is marrying the same year as a Briget Dowdal...

Parish Records

 
Parish Index search.

Church Marriage Gannon Christopher 1854 Co.Meath Dunboyne RC.
Church Marriage Dowdal Bridget     1854 Co.Meath Dunboyne RC. 


UPDATE: Paid to see the full record at Irish Family History Foundation,
and the it gives no extra information then seen in index above.

Date of Marriage 29/04/1854
     

Now from the marriage listed above we can see that the Gannon's listed in Palmerstown were not originally from there, which fits with what we already know of our Christopher Gannon.

Further evidence of this is a census return for 1911. There is a Bridget Gannon living in Palmerstown, aged 80, and her birth place is down as Co.Meath (Same place as marriage above). Puts her birth either 1830 or 1831. But then in 1901 same woman is only aged 60. Looks as if Jane has died and Cornelius has remarried.

1901 Census

 
http://www.census.nationalarchives.ie/

1901 Census taken on Sunday the 31st March.

Residents of a house 1 in Ballyfermott Upper - Palmerstown, Dublin

    Bridget Gannon  60  Head     RC  Co Meath                R&W  Widow
     Jane O'Connor  21  Dau      RC  Co Dublin               R&W  Married
Corneluis O'Connor  23  SoninLaw RC  Kings Co	Agl Labourer R&W  Married
                                                under Board 
                                                of Works
                                                

1911 Census

 

Address: 9 in Ballyfermot Upper (Parlmerstown, Dublin)

Cornelius OConnor 36 Head    RC Kings Co Labourer Board Works R&W  Married
Catherine OConnor 32 Wife    RC Co Dublin                     R&W  Married
   Bridget Gannon 80 Boarder RC Co Meath Pensioner        not R&W  Widow  

6 years married. 2 children born and 2 still living.

Also, apart from the fact that there are no other Christopher Gannons, married around the right time anywhere in Ireland. Well anywhere that's been transcribed so far. The second listed marriage above fits with his their daughter being born 1860/61.

So it's looking as if the couple moved from Co.Meath, after their marriage in 1854, to Co.Kildare where Briget was born in 1860/61, and sometime after that, but before May 1864 settled in Palmerstown. Alternatively they could of just been visiting people when Briget was born.

There are a few more Gannon Children born Co.Dublin & Kildare, within the right time frame, with father's name correct, but can't confirm one way or other if these are connected to this family or not. (see below)

Parish Records for Births

 
Church Baptisms, index search...

   Edward Gannon  1855  Co.Dublin  Blanchardstown RC, Father Christopher
  Bridget Gannon  1858  Co.Kildare Leixlip RC,   Father Christopher
     John Gannon  1863  Co.Dublin  Kingstown RC, Father Christopher
Catherine Gannon  1864  Co.Dublin  Kingstown RC, Father Christopher